Surgical tables · Modular Table System family

Mizuho OSI 5892: troubleshooting and error codes

The ServiceForge knowledge base holds 205 documented symptoms for the Mizuho OSI 5892, with 498 ranked causes, 349 diagnostic checks with test points and expected values, and 17 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Brake does not release when commanded patient safety

Brake should release when command issued with Rotation Safety Lock off but does not

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Power supply is not operating (common)
4. Cable from PC board to column is not connected (common)
5. Cable to column is faulty (occasional)
6. Brake off switch is faulty (occasional)
7. Wire connection to switch is faulty (occasional)
8. Traction arc switch closed (rare)
9. Traction arc switch wiring shorted (rare)
10. Limit switch faulty (rare)
11. Limit switch operating mechanical error (rare)

11 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake does not release with Rotation Safety Lock off

Rotation Safety Lock switch off but brake does not release when expected

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Power supply is not operating (occasional)
4. Cable from PC board to column is not connected (occasional)
5. Cable to column is faulty (occasional)
6. Brake off switch is faulty (occasional)
7. Wire connection to switch is faulty (occasional)
8. Traction arc switch closed (rare)
9. Traction arc switch wiring shorted (rare)
10. Limit switch faulty (rare)
11. Limit switch operating mechanical error (rare)

11 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt does not work with Rotation Safety Lock switch off patient safety

Tilt motor should drive table movement when Safety Lock is off but does not respond

Ranked causes

1. Table power is off (common)
2. Power supply is not operating correctly (common)
3. Power to PC board is not connected (common)
4. Hand Control is non-operative or not plugged in (common)
5. PC board is non-operative (occasional)
6. Cabling is not connected or is faulty (occasional)
7. Tilt motor is faulty (occasional)
8. Brake on sense is closed (rare)
9. Brake on sense wire is shorted (rare)
10. Either limit switch is faulty or open (rare)
11. Limit switch wiring is disconnected (rare)

11 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt function does not operate patient safety

Tilt motor does not drive when Tilt Left or Right command is issued with Rotation Safety Lock switch off

Ranked causes

1. Table power is off (common)
2. Power supply is not operating correctly (common)
3. Power to PC board is not connected (common)
4. Hand Control is non-operative or not plugged in (occasional)
5. PC board is non-operative (occasional)
6. Cabling is not connected or is faulty (occasional)
7. Tilt motor is faulty (occasional)
8. Brake on sense is closed (occasional)
9. Brake on sense wire is shorted (occasional)
10. Either limit switch is faulty or open (occasional)
11. Limit switch wiring is disconnected (occasional)

Tilt function does not work with Rotation Safety Lock switch off patient safety

Tilt left or right command does not drive tilt motor when Rotation Safety Lock switch is off

Ranked causes

1. Table power is off (common)
2. Power supply is not operating correctly (common)
3. Power to PC board is not connected (common)
4. Hand Control is non-operative or not plugged in (occasional)
5. PC board is non-operative (occasional)
6. Cabling is not connected or faulty (occasional)
7. Tilt motor is faulty (rare)
8. Brake on sense is closed (rare)
9. Brake on sense wire is shorted (rare)
10. Either limit switch is faulty or open (rare)
11. Limit switch wiring is disconnected (rare)

First check

Verify table power is on

Test point: Power supply
Expected: Power on

2 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Tilt function not working with Rotation Safety Lock off patient safety

Tilt Left or Right command with Rotation Safety Lock switch off does not drive tilt motor

Ranked causes

1. Table power is off (common)
2. Power supply not operating correctly (common)
3. Power to PC board is not connected (occasional)
4. Hand Control is non-operative or not plugged in (occasional)
5. PC board is non-operative (occasional)
6. Cabling not connected or faulty (occasional)
7. Tilt motor is faulty (rare)
8. Brake on sense is closed (rare)
9. Brake on sense wire is shorted (rare)
10. Limit switch is faulty or open (rare)
11. Limit switch wiring is disconnected (rare)

11 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt left or right does not function with Rotation Safety Lock off

Tilt left or right command issued with Rotation Safety Lock switch off but tilt motor does not drive

Ranked causes

1. Table power is off (common)
2. Power supply is not operating correctly (common)
3. Power to PC board is not connected (common)
4. Hand Control is non-operative or not plugged in (occasional)
5. PC board is non-operative (occasional)
6. Cabling is not connected or is faulty (occasional)
7. Tilt motor is faulty (occasional)
8. Brake on sense is closed (rare)
9. Brake on sense wire is shorted (rare)
10. Either limit switch is faulty or open (rare)
11. Limit switch wiring is disconnected (rare)

11 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake does not release patient safety

Rotation Safety Lock switch off but brake does not release

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Power supply is not operating (occasional)
4. Cable from PC board to column not connected or faulty (occasional)
5. Brake off switch is faulty (occasional)
6. Wire connection to switch is faulty (occasional)
7. Traction arc switch closed (rare)
8. Traction arc switch wiring shorted (rare)
9. Limit switch faulty (rare)
10. Limit switch operating mechanical error (rare)

10 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake does not release with Rotation Safety Lock switch off

Rotation Safety Lock switch off but brake does not release when expected

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Power supply is not operating (common)
4. Cable from PC board to column not connected (occasional)
5. Cable to column is faulty (occasional)
6. Brake off switch is faulty (occasional)
7. Wire connection to switch is faulty (occasional)
8. Traction arc switch closed (rare)
9. Traction arc switch wiring shorted (rare)
10. Limit switch faulty or operating with mechanical error (rare)

First check

Verify table main power is on

Test point: Main power switch
Expected: Power indicator illuminated

5 more checks with pass and fail actions, 10 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt function does not operate with Rotation Safety Lock switch off

Tilt left or right command with Rotation Safety Lock off does not drive tilt motor

Ranked causes

1. Table power is off (common)
2. Power supply is not operating correctly (common)
3. Power to PC board is not connected (common)
4. Hand Control is non-operative or not plugged in (occasional)
5. PC board is non-operative (occasional)
6. Cabling is not connected or is faulty (occasional)
7. Tilt motor is faulty (occasional)
8. Brake on sense is closed or wire is shorted (rare)
9. Limit switch is faulty or open (rare)
10. Limit switch wiring is disconnected (rare)

First check

Verify table main power is on

Test point: Main power switch
Expected: Power indicator illuminated

8 more checks with pass and fail actions, 10 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt home LED does not light patient safety

Tilt motor does not drive or LED does not illuminate when tilt command is given

Ranked causes

1. Power off or power to PC board not connected (common)
2. Power supply non-operational (occasional)
3. PC board non-operational (occasional)
4. Cable from PC board to tilt motor not connected (occasional)
5. Tilt motor non-operational (occasional)
6. Home sensor faulty (occasional)
7. Home sensor wiring shorted or misadjusted (occasional)
8. 1/r sensor faulty or wiring issue (rare)
9. Lock sensor faulty or disconnected (rare)
10. Traction arc switch closed or wiring shorted (rare)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake does not release patient safety

Brake does not release when Rotation Safety Lock switch is turned off

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Power supply is not operating (common)
4. Cable from PC board to column is not connected (occasional)
5. Cable to column is faulty (occasional)
6. Brake off switch is faulty (occasional)
7. Wire connection to switch is faulty (occasional)
8. Traction arc switch is closed or wiring is shorted (rare)
9. Limit switch is faulty or has mechanical error (rare)

Rotation Safety Lock switch off brake does not release patient safety

Rotation Safety Lock switch positioned off but brake does not release

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Power supply is not operating (common)
4. Cable from PC board to column is not connected (occasional)
5. Cable to column is faulty (occasional)
6. Brake off switch is faulty (occasional)
7. Wire connection to switch is faulty (occasional)
8. Traction arc switch closed or wiring shorted (occasional)
9. Limit switch faulty or mechanical error (occasional)

Tilt left or right with Rotation Safety Lock switch off produces no motor drive patient safety

Tilt command issued with Rotation Safety Lock switch off but tilt motor does not drive

Ranked causes

1. Table power is off (common)
2. Power supply is not operating correctly (common)
3. Hand Control is non-operative or not plugged in (common)
4. PC board is non-operative (occasional)
5. Cabling is not connected or faulty (occasional)
6. Tilt motor is faulty (occasional)
7. Brake on sense is closed or wire is shorted (occasional)
8. Either limit switch is faulty or open (occasional)
9. Limit switch wiring is disconnected (occasional)

Tilt left or right disabled patient safety

Tilt motor does not respond to left/right commands; tilt home LED does not light

Ranked causes

1. Traction arc switch closed (common)
2. Faulty tilt limit switch or wiring disconnected (occasional)
3. Power supply or PC board fault (occasional)
4. Tilt motor cable disconnected or motor non-op (occasional)
5. Home sensor faulty or misadjusted (occasional)
6. Rotation Safety Lock switch on (common)

First check

Verify traction arc switch position

Test point: Traction arc switch
Expected: Open (not closed)

4 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Reverse Trendelenburg command produces no response patient safety

Reverse Trendelenburg command issued but foot-end column does not move down and head-end column does not move up

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (common)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (occasional)

Reverse Trendelenburg function does not work patient safety

Reverse Trendelenburg command does not move foot-end column down and head-end column up

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (rare)

First check

Verify table power is on

Test point: Power supply
Expected: Power on

3 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Table does not move up patient safety

Hand Control receives command to move table up but both columns do not rise

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or is faulty (occasional)
5. Column or PC board is faulty (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Table Down command does not move columns downward

Hand Control Table Down command issued but both columns do not move down

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Table Down command produces no response patient safety

Hand control Table Down command issued but both columns do not move downward

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (common)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (occasional)

Table Up command does not move columns

Hand Control Table Up command issued but both columns do not rise

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column not connected or faulty (occasional)
5. Column or PC board is faulty (rare)

First check

Verify table main power is on

Test point: Main power switch
Expected: Power indicator illuminated

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Table Up command does not move columns upward

Hand Control Table Up command issued but both columns do not move up

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (rare)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Table Up command does not raise columns patient safety

Hand Control Table Up command does not raise both columns

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (occasional)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (rare)

First check

Verify table power is on

Test point: Main power switch
Expected: Power switch in ON position

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Table Up command produces no response patient safety

Hand control Table Up command issued but both columns do not move upward

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (common)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (occasional)

Trendelenburg command produces no response patient safety

Trendelenburg command issued but head-end column does not move down and foot-end column does not move up

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (common)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (occasional)

Trendelenburg function does not work patient safety

Trendelenburg command does not move head-end column down and foot-end column up

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or faulty (occasional)
5. Column or PC board is faulty (rare)

First check

Verify table power is on

Test point: Power supply
Expected: Power on

3 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Brake does not engage after power down patient safety

When power is turned off, brake fails to engage or LED does not turn on for 15-25 seconds

Ranked causes

1. PC board faulty (occasional)
2. Brake motor faulty (occasional)
3. Wiring to brake motor disconnected (occasional)
4. LED faulty or wiring disconnected (occasional)

First check

Verify brake engages on power down

Test point: Brake engagement
Expected: Brake engages when power off

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake does not engage on power down patient safety

LED does not turn on when power down is commanded or LED does not turn off after 15-25 seconds

Ranked causes

1. PC board faulty (occasional)
2. Brake motor faulty (occasional)
3. Wiring to brake motor disconnected (occasional)
4. LED faulty or wiring disconnected (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake does not engage or LED malfunction patient safety

Brake fails to engage when powered down, or LED does not turn on for 15-25 seconds then turn off

Ranked causes

1. PC board faulty (occasional)
2. Motor faulty (occasional)
3. Wiring to motor disconnected (occasional)
4. LED faulty or wiring disconnected (occasional)

First check

Power down table and observe brake engagement

Test point: Brake output
Expected: Brake engages immediately

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake engagement and LED response delayed or absent patient safety

When power down command issued, brake does not engage promptly or LED does not turn off after 15-25 seconds

Ranked causes

1. PC board faulty (unknown)
2. Brake motor faulty (unknown)
3. Wiring to brake motor disconnected (unknown)
4. Brake LED faulty or wiring disconnected (unknown)

First check

Verify rocking switch is off

Test point: Rocking switch
Expected: Off

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Reverse Trendelenburg position does not function

Reverse Trendelenburg command does not move foot-end column down and head-end column up

Ranked causes

1. Table power is off or power supply not operating (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column not connected or faulty (occasional)

First check

Verify table main power and power supply

Test point: Main power supply output
Expected: Power supply operating and delivering voltage

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotation Safety Lock does not release patient safety

When rotation safety lock release button is pressed with rocking switch off, lock does not release or LEDs do not illuminate

Ranked causes

1. Emergency power button faulty (occasional)
2. Button wiring not connected (occasional)
4. Lock release motor faulty (occasional)
5. Wiring to lock motor disconnected (occasional)

First check

Verify rocking switch is off

Test point: Rocking switch
Expected: OFF position

1 more check with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotation Safety Lock does not release patient safety

Lock release button pressed but lock does not release; LED remains on

Ranked causes

1. Emergency power button faulty or wiring not connected (occasional)
2. Motor faulty or wiring disconnected (occasional)
3. PC board faulty (occasional)
4. LED faulty or wiring disconnected (occasional)

First check

Press lock release button and verify motor response

Test point: Lock release button; motor connector
Expected: Lock release motor energizes; lock mechanically releases

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Table does not move down patient safety

Hand Control receives command to move table down but both columns do not lower

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column is not connected or is faulty (occasional)

Table Down command does not move columns

Hand Control Table Down command issued but both columns do not lower

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column not connected or faulty (occasional)

First check

Verify table main power is on

Test point: Main power switch
Expected: Power indicator illuminated

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt left or right with brake release does not function when Rotation Safety Lock on

Tilt L or R command with Rotation Safety Lock on does not release brake and drive tilt motor

Ranked causes

1. Brake motor faulty (occasional)
2. Wiring not connected (occasional)
3. Hand Control faulty (occasional)
4. PC board faulty (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt left or right with Rotation Safety Lock switch on produces incorrect response patient safety

Tilt command issued with Rotation Safety Lock switch on but brake does not release and tilt motor does not drive as expected

Ranked causes

1. Brake motor faulty (occasional)
2. Wiring not connected (occasional)
3. Hand Control faulty (occasional)
4. PC board faulty (occasional)

Tilt motor does not drive to home position patient safety

When tilt command is issued, motor fails to drive until tilt home LED lights

Ranked causes

1. Power off or PC board power not connected (common)
2. Power supply non-operational (occasional)
7. 1/r sensor faulty, wiring shorted or disconnected, or misadjusted (occasional)
9. Traction arc switch closed (rare)

First check

Verify system power is on

Test point: Main power
Expected: Power present

4 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Trendelenburg position does not function

Trendelenburg command does not move head-end column down and foot-end column up

Ranked causes

1. Table power is off or power supply not operating (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)
4. Cable from PC board to column not connected or faulty (occasional)

First check

Verify table main power and power supply

Test point: Main power supply output
Expected: Power supply operating and delivering voltage

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake engagement delayed or LED failure caution

Brake engages but LED does not turn on, or takes longer than expected to illuminate

Ranked causes

1. PC board faulty (occasional)
2. Motor faulty or wiring disconnected (occasional)
3. LED faulty or wiring disconnected (occasional)

First check

Verify brake motor operation

Test point: Brake motor connector
Expected: Motor energizes; mechanical brake engages

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Brake motor disabled patient safety

Brake does not engage or disengage; motor does not respond to brake commands

Ranked causes

1. Faulty traction arc switch or wiring (common)
2. Rotation Safety Lock switch off (common)
3. PC board faulty (occasional)

First check

Verify Rotation Safety Lock switch position

Test point: Rotation Safety Lock switch
Expected: ON

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Tilt Home & Tilt Left/Right Sensors high voltage

Adjustment of tilt mechanism sensors to ensure proper centering and stop positions during lateral tilt operations.

Ranked causes

1. Tilt Home Sensor misalignment (common)
2. Tilt Left/Right Sensor bracket position incorrect (common)
3. Electronic fault in Base or wiring (occasional)

First check

Power on and verify indicator light

Test point: 180 Degree Rotation Lock indicator light
Expected: Blue light illuminates

6 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Check Baby alarm (Manual Control Models) patient safety

Three distinct conditions flagged in IW920, IW95x, IW970, IW990 manual models

Ranked causes

1. Manual Mode running >25% power for >15 minutes (common)
2. Skin temperature exceeds 39°C (common)
3. DuoSense skin sensor fault detected (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Indicator accompanied by rapid pulsing two-tone alarm

See manual indicator is accompanied by a rapid pulsing two-tone alarm sound

Ranked causes

1. Skin sensor is damaged, not inserted fully, or not a twin bead YSI 400 type (common)
2. Defective internal component (occasional)
3. Power PCB defective (rare)

First check

Is indicator accompanied by rapid pulsing two-tone alarm?

Test point: Alarm sound pattern
Expected: Rapid pulsing two-tone alarm with indicator

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

No column function at either end high voltage

Surgical table columns do not respond to control input at head-end or foot-end

Ranked causes

1. No power input (common)
2. Hand Control defective or unplugged (common)
3. Electrical connector at column base disconnected (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

No column function either end patient safety

Table columns (both head-end and foot-end) not responding to hand control input

Ranked causes

1. No power or circuit breaker off (common)
2. Hand Control defective or disconnected (common)
3. Electrical connector at base of column disconnected (common)

First check

Verify input power

Test point: Power cord and main power switch
Expected: Power cord plugged into live outlet; Power Switch ON; circuit breaker light green

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Release Tilt button does not stop tilt motion patient safety

Releasing Tilt button does not stop tilt motor and does not engage brake

Ranked causes

1. Hand Control faulty (occasional)
2. PC board faulty (occasional)
3. Same as tilt with rocker on causes (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Release Tilt button does not stop tilt motor or engage brake

Release Tilt button does not cease tilt motor operation or engage brake

Ranked causes

1. Hand Control is faulty (common)
2. PC board is faulty (common)
3. Brake issue same as with Rotation Safety Lock on (occasional)

First check

Test Hand Controller Release Tilt button

Test point: Release Tilt button
Expected: Button activates and signal reaches PC board

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotation friction control will not stop rotation caution

Surgical table rotation friction brake does not lock to halt rotation at head-end or foot-end

Ranked causes

1. Friction control lever not maximized (common)
2. Brake band defective or worn (occasional)
3. Handle out of proper adjustment range (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotation Safety Lock does not engage patient safety

Lock fails to engage 15-25 seconds after release button released and Rrocker switch turned off

Ranked causes

1. PC board faulty (occasional)
2. Motor faulty (occasional)
3. Wiring to motor disconnected (occasional)

First check

Verify rocking switch is off

Test point: Rocker switch
Expected: Off position

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotation Safety Lock does not engage after release patient safety

When rotation safety lock release button is released, lock fails to engage within 15-25 seconds or LED does not turn off

Ranked causes

1. PC board faulty (occasional)
2. Lock motor faulty (occasional)
3. Wiring to lock motor disconnected (occasional)

First check

Release rotation safety lock release button

Test point: Release button
Expected: Released (button off)

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

See Manual alarm patient safety

Software detected hazard and shut down heater; LED flashing indicates alarm state

Ranked causes

1. Software-detected hazard condition (unknown)
2. Microcontroller failure (hardware watchdog triggered) (rare)
3. Overheat protector tripped (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Skin sensor fault detection

IW900 series infant warmer automatically detects thermistor deviation or electrical contact defects via dual thermistor bead comparison

Ranked causes

1. Thermistor bead mismatch (unknown)
2. Thermistor bead shorting (unknown)
3. Thermistor open circuit (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt does not operate with Rotation Safety Lock on patient safety

Brake does not release and tilt motor does not drive when Tilt Left or Right command is issued with Rotation Safety Lock switch on

Ranked causes

1. Tilt function issue (same as with switch off) (common)
2. Brake motor is faulty (occasional)
3. Brake wiring is not connected (occasional)

Tilt function does not work with Rotation Safety Lock switch on patient safety

Tilt left or right does not drive tilt motor when Rotation Safety Lock switch is on

Ranked causes

1. Same causes as tilt with rocker switch off (common)
2. Brake motor faulty (rare)
3. Brake motor wiring not connected (rare)

First check

Verify brake motor wiring is connected

Test point: Brake motor connector
Expected: Connected

Tilt function with Rotation Safety Lock on does not work patient safety

Tilt Left or Right with Rotation Safety Lock switch on does not drive tilt motor

Ranked causes

1. Same causes as tilt with rocker switch off (common)
2. Brake motor faulty (rare)
3. Wiring not connected (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt motor disabled when traction arc switch closed

Tilt left or right command does not move table; motor disabled state

Ranked causes

2. Broken wiring connection to traction arc switch (unknown)
3. Traction arc switch adjustment incorrect (unknown)
4. PC board faulty (unknown)

First check

Verify traction arc switch is closed

Test point: Traction arc switch
Expected: Closed

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Tilt with Rotation Safety Lock on does not work patient safety

Brake should release and tilt motor should drive when Safety Lock is on but does not

Ranked causes

1. Same issues as tilt with rocker switch off (common)
2. Brake motor faulty (occasional)
3. Brake motor wiring not connected (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt with Rotation Safety Lock switch on does not move tilt motor or brake

When Rotation Safety Lock switch is on, tilt command does not drive tilt motor or release brake

Ranked causes

1. Tilt control issue same as with lock switch off (common)
2. Brake motor faulty (occasional)
3. Brake motor wiring not connected (occasional)

First check

Verify tilt function basics

Test point: Power, PC board, Hand Controller, cabling
Expected: All connections and power verified

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Trendelenburg function does not operate patient safety

Head-end column does not move down and foot-end column does not move up when Trendelenburg command is issued

Ranked causes

1. Table power is off (common)
2. Power to PC board is not connected (common)
3. Hand Controller is non-operative or not plugged in (occasional)

More symptoms

Brake does not engage with Rotation Safety Lock switch on
Calibration: Bassinet clutch adjustment
Calibration: Bassinet mounting assembly
Calibration: Bassinet mounting assembly (pre-Feb 2004)
Casters do not rotate freely
Check Baby alarm
Emergency Power battery backup does not maintain indicator lights
Emergency Power override button does not provide 30-second battery power
Function does not stop when button is released
High skin temperature alarm
Indicator flashing
Manual indicator flashing
No column function at foot-end only
No column function at head-end only
No column function Foot-end
No column function Head-end
ON/OFF switch or circuit-breaker not functioning
Power supply installation
Release button (all functions except Tilt with Rotation Safety Lock on) does not stop function
Release button does not stop function
Release button does not stop other functions
Release button on non-Tilt functions produces no effect
Release Tilt button does not stop tilt motor
Release Tilt button does not stop tilt motor or engage brake
Reverse Trendelenburg command does not work
Reverse Trendelenburg function does not operate
Rotation Safety Lock does not engage
Sensor disconnect alarm
Tilt does not stop when button is released
Tilt Drive Status Indicator does not operate properly
Tilt left or right disabled
Tilt left or right disabled with rotation safety lock on
Trendelenburg command does not work
180 degree rotation lock handle does not lock or indicator light does not illuminate
180 degree rotation unlock does not release lock or crossbar does not rotate freely
180-degree Rotation Locks do not engage
AC wire pinching or crushing under transformer
Alarm is sounding and mute button is not being pressed
Alarm sounding
Battery fault indication
Brake does not engage
Brake does not engage
Brake does not engage with Rotation Safety Lock on
Braking casters do not lock or remain engaged
Calibration: 180 Degree Rotation Lock sensor and torque
Calibration: 180 Degree Rotation Lock sensor diagnostic
Calibration: Base level adjustment
Calibration: Bassinet brake adjustment (toothed brake system)
Calibration: Castor angle adjustment
Calibration: Cosycot base assembly
Calibration: Electric elevator operation
Calibration: Flowmeter operation
Calibration: Gas hose inspection
Calibration: Gas supply regulator pressure
Calibration: Gas system leak test
Calibration: Head-End Slider adjustment
Calibration: Head-End Slider friction adjustment
Calibration: Infant warmer base setup for servicing
Calibration: Mobile warmer assembly
Calibration: Phototherapy cable and mounting
Calibration: Phototherapy lamp and warning light
Calibration: Phototherapy light head pivot
Calibration: Preset base height adjustment (models after February 2004)
Calibration: Preset base height adjustment (models before February 2004)
Calibration: Rotation Safety Lock micro-switch engagement
Calibration: Rotation Safety Lock resistance
Calibration: Safety and performance checks
Calibration: Storage bins rotation
Calibration: Storage drawer
Calibration: System performance check
Calibration: Temperature sensor
Calibration: Tilt Actuator rod-end length
Calibration: Transport handle operation
Calibration: UPS operation and runtime
Calibration: Voltage measurement
Calibration: Warmer head pivot
Caster removal and replacement
Caster shake or abnormal movement
Caster wheels worn or damaged
Caster will not lock or unlock
Caster won't lock/unlock
Center beam does not retract or extend smoothly
Center beam locking knob does not lock beam
Controller PCB electrostatic discharge damage
Controller PCB removal
Controller PCB removal procedure
Controller PCB removal sequence
Controller Printed Circuit Board removal
Controller removal
Current leakage test
Emergency override battery backup does not operate
Emergency Rotation Lock does not engage at power OFF
Emergency Rotation Lock Override does not release lock
ESD precautions for Controller handling
Foot brake does not remain locked when Arc Interlock Switch is activated
Foot-end Crossbar does not rotate freely when unlocked
Hand control buttons not legible or control cord damaged
Hand control cable reinstallation
Hand control cable removal and replacement
Hand Control cable removal or installation
Head end assembly does not slide uniformly or requires excessive force
Head-end beam removal or installation
Head-end Crossbar does not rotate freely when unlocked
Head-end or Foot-end Crossbar rotates when locked
Head-End Slider does not move uniformly or with incorrect force
Height adjustment binds or produces excessive noise
Inaccurate skin temperature reading
Indicator accompanied by constant monotone alarm
Indicator with monotone alarm
Indicator with two-tone pulsing alarm
Leakage current risk during power supply installation
Low skin temperature alarm
Manual alarm sounding
No response to mute button during alarm
Performance and functional verification
Power cord worn or damaged
Power fail alarm
Power fail alarm flashing
Power supply installation procedure
Power Supply installation required
Power Supply installation sequence
Replace on-off power switch or circuit breaker
REVERSE TRENDELENBURG function not responding
Reverse Trendelenburg function not working
Rotation friction control won't stop rotation
Rotation lock does not hold torque or crossbar exceeds rotation tolerance
Rotation safety lock switch does not disengage or foot end crossbar does not rotate freely
Rotation safety lock switch does not engage or foot end crossbar continues rotating
Rotation Safety Lock switch on brake does not engage
Rotational Safety Lock does not prevent crossbar rotation
Skin temperature reading inaccurate
Steer caster does not lock straight or wheel does not roll
Table Down command does not lower columns
TABLE DOWN function not responding
TABLE UP function not responding
Temperature display out of calibration
Tilt function does not disable when Arc Interlock Switch is activated
TILT LEFT function not responding
Tilt motor disabled when rotation safety lock switch off
TILT RIGHT function not responding
TRENDELENBURG function not responding
Trendelenburg function not working
Unable to maintain stable skin temperature control
Unable to provide stable control of skin temperature in baby/patient mode
Wall outlet power switch turned off

145 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`11`	Button multiplexer is not responding correctly. Buttons cannot be sensed.	Button multiplexer hardware failure detected during operation	error
`1-2`	Temperature multiplexer is not responding correctly. Temperature cannot be measured.	Temperature multiplexer hardware failure detected during operation	error
`13`	Device could not sense frequency of mains power supply at power-up.	Mains frequency not detected during power-on sequence	warning
`14`	One ADC conversion failed to complete in normal time. Temperature readings cannot be relied on.	ADC hardware timeout detected during normal operation	critical
`15`	LED display driver (U1) detected to be faulty. LEDs and displays not functioning; button scanning failed.	Display driver hardware failure detected during LED/button scan operation	error
`16`	RS232 output serial communications buffer overflow detected.	Serial buffer exceeded capacity during transmission	warning
`17`	Triac firing insufficient or uncontrolled power delivery to heating element.	Triac detected delivering insufficient/uncontrolled power during normal operation	warning
`18`	Triac detected delivering additional/uncontrolled power to heating element.	Spurious triac firing detected during normal operation	warning
`19`	Relay isolating heating element detected opened. Relay protection activated.	Relay opened during operation or continuous full power condition detected by hardware watchdog	critical
`5`	Two thermistor beads in DuoSense™ skin sensor detected shorted together.	Continuity detected between both thermistor beads in sensor	warning
`7`	Microprocessor stack has overflowed indicating microprocessor or memory failure.	Stack pointer exceeded allocated memory during program execution	critical
`CHECK BABY ALARM`	Output power sustained high or baby requires monitoring in Manual Mode or infant warmer is running in manual mode at over 25% power	Baby Mode: output at 100% for ≥15 min; Manual Mode: output >25% for ≥15 min; skin temperature >39°C in manual control models; skin sensor faulty	warning
`HIGH SKIN TEMP. ALARM`	Baby skin temperature exceeds safe threshold	Baby Mode: skin temp exceeds set temp by ≥1.0°C; Prewarm/Manual Mode: skin temp exceeds 39°C	warning
`LOW SKIN TEMP. ALARM`	Baby skin temperature remains below set target in Baby Mode	Baby Mode: set temp exceeds skin temp by ≥1.0°C	warning
`POWER FAIL ALARM`	No power supplied to warmer	Power supply lost to warmer; power switch off or wall outlet switched off	error
`SEE MANUAL ALARM`	Software detected hazard and shut down heater; LED flashing indicates alarm state preserving error code	Hazard condition detected by software; or hardware watchdog detected microcontroller failure; or overheat protector tripped	critical
`SENSOR DISCONNECT ALARM`	Skin temperature sensor problem detected: not fully inserted or thermistor bead mismatch	Problem detected with skin temperature sensor during operation; bead mismatch within 25 sec of sensor plug insertion	warning

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.