Cpm devices

Kinetec Spectra Knee: troubleshooting and error codes

The ServiceForge knowledge base holds 29 documented symptoms for the Kinetec Spectra Knee, with 50 ranked causes, 26 diagnostic checks with test points and expected values, and 10 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Nothing on the display of the hand control

Hand control display is blank or not powered

Ranked causes

1. Product is unplugged (common)
2. Product is switched off (common)
3. Hand control is unplugged (common)
4. Wall-socket AC voltage out of range (occasional)
5. Power supply PCB input AC voltage failure (occasional)
6. Power supply PCB output DC voltage failure (occasional)
7. Motor PCB input DC voltage failure (occasional)
8. Hand control connector panel voltage failure (occasional)
9. Hand control connector voltage failure (occasional)

First check

Verify product is plugged in

Test point: wall socket
Expected: Product connected

8 more checks with pass and fail actions, 14 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Machine does not recognize connected motor during auto diagnostic

Motor not detected during automatic diagnostic procedure

Ranked causes

1. Junction cable is unplugged (common)
2. Communication line continuity failure (occasional)
3. Motor PCB fuse open (occasional)
4. Spiral cable for hand control failure (occasional)
5. Motor PCB failure (occasional)

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

Bad messages on the display of the hand control

Incorrect or corrupted text displayed on hand control screen

Ranked causes

1. Software version 1.1 or lower (occasional)
2. Software configuration error (occasional)
3. Ribbon cable interference with LCD pins (occasional)

First check

Switch product OFF then ON

Test point: power switch
Expected: System reinitializes

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

Movement does not reverse with high load patient safety

Under high load conditions, CPM fails to reverse direction or stalls

Ranked causes

1. Motor calibration incorrect (common)
2. Motor or gearbox failure (occasional)
3. Motor PCB failure (occasional)

First check

Check load values with dynamometer

Test point: Motor load measurement point
Expected: Load within specification per method MET09041
Tools: Dynamometer

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

One or more keypad keys not working

Keypad keys are unresponsive or do not register input

Ranked causes

1. Ribbon cable unplugged (common)
2. Ribbon cable broken (occasional)
3. Defective hand control (unknown)

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

Copy potentiometer pin loose or misaligned

Potentiometer position feedback may be inaccurate if pin is not properly tightened or centered

Ranked causes

1. Copy potentiometer pin not tightened (occasional)
2. Copy potentiometer misaligned (occasional)

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

CPM produces excessive noise caution

Device operation generates abnormal or loud noise during movement

Ranked causes

1. Ball screw requires lubrication (common)
2. Mechanical articulations require lubrication (common)

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

Incomplete messages on display or first line squares dark

LCD display shows partial or garbled text, or first line characters appear as dark squares

Ranked causes

1. Defective display unit (unknown)
2. Defective hand control (unknown)

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

Abnormal motor or ball screw noise caution

Audible noise from motor or ball screw mechanism indicates potential mechanical issue

Ranked causes

1. Ball screw wear or contamination (occasional)

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

Articulation assembly defective caution

Articulation/knee joint mechanism may be damaged or misaligned

Ranked causes

1. Articulation assembly damage or misalignment (occasional)

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

Avoid modifying incorrect load parameters caution

Do not change LOAD MVT 1 and 2 parameters during load adjustment; only LOAD MVT Lo, LOAD MVT Hi, and LOAD MOTEUR 1 should be modified

Ranked causes

1. Risk of incorrect load calibration (common)

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

Calibration: adjust extension potentiometer

Fine-tune -10 degree extension limit by adjusting knee potentiometer under rear cover

Ranked causes

1. Extension limit not at -10 degrees (occasional)

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

Calibration: Load adjustment

Adjust extension and flexion load forces using hand controller parameters after running unit for several minutes

Ranked causes

1. Load calibration required during service (common)

First check

Set maximum extension load

Test point: Hand controller LOAD MOTEUR parameter
Expected: 35 ±5 daN, ±5 daN

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

Calibration: Maximum extension force adjustment patient safety

Adjust the CPM unit's force output during maximum extension movement

Ranked causes

1. Force compensation requires adjustment via menu parameters (common)

First check

Navigate to LOAD MVT1 Lo menu

Test point: Control panel display
Expected: LOAD MVT1 Lo displayed

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

Calibration: Parameter reinitialization patient safety

Reset CPM parameters to standard values after any mechanical or electrical adjustment

Ranked causes

1. Standard value reset required after maintenance (common)

First check

Power cycle the unit

Test point: Power switch
Expected: Unit powers off then on

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

Connector connection loose or corroded high voltage

Motor card, power supply card, or potentiometer connector may be loose or oxidized

Ranked causes

1. Loose or corroded connectors (occasional)

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

Control card loose in hand control grip caution

Circuit board in hand control may not be secured properly with screws

Ranked causes

1. Control card mounting screws loose (occasional)

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

Device counter requires reset

Counter values may need re-initialization to factory defaults or standard values

Ranked causes

1. Counter values out of range or corrupted (unknown)

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

Electrical safety test sequence 16 failure high voltage

Device fails electrical safety security test sequence 16

Ranked causes

1. Electrical safety test failure (unknown)

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

Extension load out of specification

Load measurement during extension movement should be within specified tolerance

Ranked causes

1. Load measurement error or actuator malfunction (unknown)

First check

Measure extension load

Test point: Load cell or force measurement point
Expected: 35 DaN, +/-5 DaN

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

Flexion load out of specification

Load measurement during flexion movement should be within specified tolerance

Ranked causes

1. Load measurement error or actuator malfunction (unknown)

First check

Measure flexion load

Test point: Load cell or force measurement point
Expected: 40 DaN, +/-5 DaN

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

Fuse 750 mA T incorrect or blown high voltage

Power supply fuse may be incorrect value or open

Ranked causes

1. Fuse 750 mA T open or wrong rating (occasional)

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

Keyboard function malfunction

One or more keyboard functions not responding or operating correctly

Ranked causes

1. Keyboard or control circuit defect (unknown)

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

LCD segments not displaying correctly

LCD display may show partial or missing segments, indicating connection or component failure

Ranked causes

1. LCD connector loose or LCD failure (occasional)

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

Message LOAD MAXI displayed

Unit displays LOAD MAXI message

Ranked causes

1. Abnormal motor consumption (unknown)

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

Message SERVICE TIME M1 displayed

Unit displays SERVICE TIME M1 message when switched on after 2000 operating hours

Ranked causes

1. Preventive maintenance due at 2000 operating hours (common)

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

Motor current exceeds limit at maximum speed

Motor consumption check during flexion movement between 30° and 60° after running-in period on large femur with 10 kg load; current should not exceed 700 mA

Ranked causes

1. Motor overload or excessive friction (unknown)

First check

Measure motor current at maximum speed

Test point: Motor supply circuit
Expected: < 700 mA, < 700 mA

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

Movement reverses before reaching limits

CPM reverses direction before reaching programmed motion limits

Ranked causes

1. Potentiometer calibration drift (unknown)

First check

Verify angle value changes continuously

Test point: LCD display angle readout
Expected: Angle value increments or decrements continuously without jumps

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

Offset between mechanical angle and displayed value patient safety

Displayed angle does not match actual mechanical position

Ranked causes

1. Unit calibration drift (common)

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

Error codes

Code	Meaning	Trigger	Severity
`CONNECTION DEFECT`	Communication or physical connection problem between components	Appears when running device; junction cable disconnected or continuity fault	error
`DEFECT ANGULAR P05I`	Angular position parameter lost or angular position sensor defective	EEPROM parameters lost (affects units up to n°336); power supply monitor weld failure	error
`LOAD MAXI`	Load maximum indicator	Abnormal motor consumption	warning
`M1: SERVICE D1`	Failure of angle measurement function	Angle measurement system malfunction detected	error
`M1: SERVICE D2`	Motor supplied but no movement	Motor receiving power but not producing motion	error
`M1: SERVICE D3`	Short circuit or abnormal motor consumption	Motor drawing excessive current	error
`M1: SERVICE D4`	Motor supplied but does not run	Motor powered but not rotating	error
`MOTOR CARD BAD`	Motor PCB or motor controller circuit has fault	Detected at power-on; may persist or clear with reset	critical
`SELECT A VALID MOVEMENT`	Movement command invalid or motor/sensor not properly responding	Power-on self-test failure; motor PCB issue	error
`SERVICE TIME M1`	Preventive maintenance required	2000 operating hours reached	info

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.