Electrosurgical monitoring systems

Encision AEM Monitor: troubleshooting and error codes

The ServiceForge knowledge base holds 16 documented symptoms for the Encision AEM Monitor, with 55 ranked causes, 37 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit does not power on (Bipolar End Point Monitor)

No power, no indicators, no beeps when powered on. POST function not executed.

Ranked causes

1. Disconnected or faulty power cord (common)
2. Blown fuse or open fuse drawer (common)
3. Malfunctioning power entry module (occasional)
4. Malfunctioning power switch (occasional)
5. Malfunctioning AC Power Cable (internal) (occasional)
6. Malfunctioning power supply (occasional)
7. Internal cables loose or faulty (common)
8. Malfunctioning ESM Display Board (occasional)

First check

Verify power cord connections

Test point: power cord at monitor and wall
Expected: firmly connected

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

Unit does not power on

No power, no indicators, no beeps. POST function did not execute at startup.

Ranked causes

1. Disconnected or faulty power cord (common)
2. Blown fuse or open fuse drawer (common)
3. Malfunctioning power entry module (occasional)
4. Malfunctioning power switch (occasional)
5. Malfunctioning AC power cable (internal) (occasional)
6. Malfunctioning power supply (occasional)
7. Internal cables loose or disconnected (common)

First check

Verify power cord connections

Test point: power cord at monitor and wall receptacle
Expected: firmly connected

3 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

AEM Cord indicator remains on patient safety

Electrosurgical generator locked in alarm state. AEM (Active Electrode Monitor) cord indicator continuously lit.

Ranked causes

1. Poor cord connection to instrument or monitor (common)
2. Malfunctioning or damaged AEM cord (occasional)
3. Malfunctioning connection to ESM Main Board (occasional)
4. Malfunctioning ESM Main Board (rare)
5. Malfunctioning ESM Display Board (occasional)

First check

Verify cord connections

Test point: AEM cord connectors at instrument and monitor
Expected: firmly seated

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

Front panel display does not turn off when remote plugged in

Front panel bar graph display continues showing indication when End Point Monitor Remote is plugged into rear connector.

Ranked causes

1. Malfunctioning EPM Main Board (occasional)
2. Internal cables loose or malfunctioning (occasional)
3. Malfunctioning End Point Monitor Remote unit (occasional)
4. Defective EPM Main Board (rare)
5. Remote cable or connection problem (occasional)

First check

Test remote resistance

Test point: remote display plug pins 1 & 2
Expected: <=2 ohms, <=2
Tools: Ohmmeter

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

Return Electrode indicator remains on patient safety

Electrosurgical generator locked in alarm state. Return Electrode indicator continuously lit.

Ranked causes

1. Improper return electrode installed (common)
2. Dual Electrode pin not being detected (common)
3. Malfunctioning connection to ESM Main Board (occasional)
4. Defective ESM Main Board (rare)
5. Defective ESM Display Board (occasional)

First check

Verify dual-pad return electrode

Test point: return electrode connector
Expected: dual-pad with projecting pin

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

Electrosurgical generator in alert state patient safety

Contact quality monitor activated. Generator not in full alarm but alert condition is triggered.

Ranked causes

1. Dual pad open or short circuited (common)
2. Poor connection in return electrode circuit (common)
3. Malfunctioning electrosurgical generator (occasional)
4. Malfunctioning connection to ESM Main Board (occasional)

First check

Verify dual pad resistance

Test point: dual pad electrodes
Expected: correct resistance per ESG

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

No audible indication (no clicking)

Speaker does not click when ESG activated, but bar graph shows correct indication.

Ranked causes

1. Volume Control switch in wrong position (common)
2. Malfunctioning speaker, switch, or cable (occasional)
3. Malfunctioning EPM Main Board (occasional)
4. Faulty power supply (occasional)

First check

Check Volume Control switch position

Test point: Volume Control switch
Expected: switch in High (up) position

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

Ready indicator remains on with no fault indicators patient safety

Generator locked in alarm state but Ready indicator lights and other fault indicators are off.

Ranked causes

1. Inappropriate internal state of AEM Monitor (common)
2. Malfunctioning electrosurgical generator (occasional)
3. Malfunctioning ESM Display Board (occasional)
4. Malfunctioning connection to ESM Main Board (occasional)

First check

Power cycle the unit

Test point: power switch
Expected: unit resets, Ready indicator off

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

Fuzzy indication on bar graph at high end

Bar graph indication is unstable at high end of current scale. Bars at right end neither fully on nor off.

Ranked causes

1. Internal cables loose or malfunctioning (common)
2. Malfunctioning EPM Display Board (occasional)
3. Malfunctioning EPM Main Board (occasional)

First check

Reseat internal connections

Test point: all internal connectors
Expected: firmly seated

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

Insulation indicator does not light during fault patient safety

AEM Monitor fails to detect operative fault. Insulation light remains off when fault occurs.

Ranked causes

1. Arc detector failure (rare)
2. Short detector failure (rare)
3. Blown fuse(s) on power supply (unknown)

First check

Test arc detection

Test point: AEM signal line
Expected: Insulation light on, ESG deactivated

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

No bar graph indication

Bipolar current measurement display shows no bar graph indication when ESG is activated.

Ranked causes

1. Malfunctioning EPM Display Board (occasional)
2. Malfunctioning EPM Main Board (occasional)

First check

Test with replacement display board

Test point: J2 connector, bipolar output setup
Expected: bar graph indicates at ~3W

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

End Point Monitor Remote Display does not indicate when plugged in

Remote display connector shows no indication when plugged into rear connector, but front panel display works when remote is removed.

Ranked causes

1. Defective End Point Monitor Remote unit (occasional)

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

End Point Monitor Remote plugged into rear connector

Issue with remote display connection to End Point Monitor.

Ranked causes

1. End Point Monitor Remote plugged in (common)

First check

Inspect remote connector

Test point: Remote Display connector on rear
Expected: empty/no remote plugged in

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

Front panel not functioning

POST begins but front panel indicators do not light or function properly.

Ranked causes

1. Front panel malfunction (occasional)

First check

Test with replacement display board

Test point: J2 connector on ESM Main Board
Expected: indicators function with replacement board

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

Generator not in alert state during fault patient safety

Ready indicator is off and any of the following are on: AEM Cord, Return Electrode, or Insulation indicators.

Ranked causes

1. Defective ESM Main Board (rare)

First check

Measure ESM Main Board resistance

Test point: J1 pins 5 & 6
Expected: >2 ohms, >2
Tools: Ohmmeter

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

Power supply output voltages incorrect high voltage

After Three Output Power Supply replacement, one or more output voltages at J2 are out of specification

Ranked causes

1. Three Output Power Supply board failure or misadjustment (common)

First check

Measure output voltages at power supply J2

Test point: J2 pins 1, 2, 3, 4, 5
Expected: Pin 1: +15.0 ±.1V; Pin 2: ground; Pin 3: +5.27 ±.05V; Pin 4: ground; Pin 5: -15.0 ±.1V, ±0.1V (±15V), ±0.05V (+5.27V), ±0.1V (-15V)
Tools: Digital multimeter

1 corrective action and part numbers 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.