Test equipment gamma probes

Neoprobe 2200: troubleshooting and error codes

The ServiceForge knowledge base holds 25 documented symptoms for the Neoprobe 2200, with 54 ranked causes, 53 diagnostic checks with test points and expected values, and 9 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

No response during power up high voltage

Unit does not respond when powered on

Ranked causes

1. Power cord failed or not properly connected (common)
2. Mains fuse blown (common)
3. Failed power switch (occasional)
4. Failed line filter (occasional)
5. Failed +12VDC power supply (occasional)
6. Failed AC power cord (rare)
7. Failed AC wiring kit (rare)
8. Failed GDS board (rare)

First check

Power cord connection

Test point: Power cord connector
Expected: Securely connected

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

No response or intermittent response to known gamma radiation source radiation

Unit does not respond or responds intermittently to gamma radiation from known source

Ranked causes

1. Incorrect energy threshold selected (common)
2. Failed detector probe (common)
3. Failed detector cable (external) (occasional)
4. Failed probe input cable (internal) (occasional)
5. Failed probe bias voltage (occasional)
6. Failed GDS board processor (rare)
7. Failed GDS board >50VDC output (rare)

First check

Verify radionuclide setting

Test point: Radionuclide selector
Expected: Correct radionuclide selected for source

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

No audible response when system displays visual response to gamma radiation

System detects radiation and displays counts but produces no audio output (unmuted)

Ranked causes

1. System is muted (common)
2. Background count set above level of detection (common)
3. Speaker cable failure (occasional)
4. Failed speaker (occasional)
5. Auxiliary board cable failure (occasional)
6. GDS board failure (rare)

First check

Verify mute status

Test point: Mute button and mute icon display
Expected: Mute icon not flashing; audio enabled

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

Error no probe condition on power-up or during operation with corded probe connected

Unit displays error condition indicating no probe detected when probe is connected

Ranked causes

1. Failed detector cable (common)
2. Failed detector probe (common)
3. Failed probe supply voltage from GDS board (occasional)
4. (Model 2300) Failed auxiliary board (occasional)

First check

Test with different detector cable

Test point: Detector cable connector
Expected: Probe detected without error

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

Cooling fan not running caution

Internal cooling fan is not operating during unit operation

Ranked causes

1. Cooling fan failed (common)
2. Auxiliary board cable failure (occasional)
3. Internal wiring/cabling interference with fan blades (occasional)

First check

Measure voltage at cooling fan terminals

Test point: Cooling fan terminals
Expected: +12VDC

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

No response from input controls

Front panel buttons and controls do not respond to user input

Ranked causes

1. Failed display board (front panel buttons) (common)
2. Failed auxiliary board (radionuclide button) (occasional)
3. Failed auxiliary board cable (radionuclide button) (occasional)

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

Probe gives unexpected high counts when no gamma radiation source is present radiation

Unit detects and counts radiation when no external source is present in the detection area

Ranked causes

1. Unknown radiation source present (common)
2. Failed detector probe (high electronic noise) (occasional)
3. Failed GDS board (rare)

First check

Visually inspect probe for contamination

Test point: Probe surface
Expected: No visible contamination or radioactive material

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

Calibration: Volume adjustment knob disassembly and repair caution

Step-by-step procedure for safely disassembling, servicing and reassembling the console to access and replace internal components, particularly the volume potentiometer.

Ranked causes

1. Internal component requiring replacement (unknown)
2. Volume encoder damage from mechanical shock (common)

First check

Verify five screws removed from rear housing

Test point: Rear of unit
Expected: All five screws removed with No. 1 or No. 2 Phillips screwdriver

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

Display freezes or locks up during operation

Display becomes unresponsive and does not update during operation

Ranked causes

1. Failed GDS board (occasional)
2. Failed display board (occasional)

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

Calibration: Disassembly and reassembly for component replacement caution

Pictorial procedure for disassembling the Neoprobe 2300 console to access internal components for repair or replacement, then reassembling the unit.

Ranked causes

1. Component requiring replacement identified via service manual (unknown)

First check

Gather tools and materials

Test point: Work area
Expected: Phillips head screwdriver (No. 1 or No. 2), protective circular device for volume knob, tape rolls

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

Calibration: Disassembly and reassembly for parts replacement caution

Step-by-step procedure for opening Neoprobe 2200 console to access internal components for repair or replacement, with emphasis on protecting the volume adjustment knob and potentiometer from mechanical damage.

Ranked causes

1. Parts requiring replacement per service manual (unknown)

First check

Remove five rear screws

Test point: Rear of unit
Expected: Screws removed cleanly without stripping
Tools: No. 1 or No. 2 Phillips head screwdriver

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

Calibration: Disassembly and reassembly procedure caution

Step-by-step instructions for disassembling the Neoprobe 2200 console to access and replace internal components, with emphasis on protecting the volume adjustment knob and preventing ESD damage.

Ranked causes

1. Need to access and replace internal components (common)

First check

Remove fasteners from rear panel

Test point: Five screw holes on rear of unit
Expected: Five Phillips head screws removed with No. 1 or No. 2 screwdriver

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

Calibration: Volume control adjustment

Volume adjustment component on console front panel for audio signal output control

Ranked causes

1. Volume adjustment needed (unknown)

First check

Verify volume adjustment component operation

Test point: Front panel volume control
Expected: Clockwise rotation increases audio output; counter-clockwise rotation decreases audio output

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

Error 12 through Error 16 displayed

Hardware error indication on display

Ranked causes

1. Hardware error (common)

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

Error 2 displayed

General software error indication on display

Ranked causes

1. General software error (unknown)

First check

Power cycle unit

Test point: Power switch
Expected: Error 2 clears after power on

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

Error 7 displayed

Sound generation error indication

Ranked causes

1. Sound generation error (common)

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

GDS fails to display error no probe without probe connected (Model 2200)

Unit does not display error no probe condition when no probe is connected

Ranked causes

1. Failed GDS board (common)

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

LED not illuminated when expected

Display LED does not illuminate during normal operation or power-up

Ranked causes

1. Failed LED (common)

First check

Observe LED during power-up cycle

Test point: Display LED indicator
Expected: LED illuminates during power-up

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

No Linc displayed after attempting to link to wireless probe

Unit displays 'no Linc' when attempting wireless probe connection

Ranked causes

1. Failed wireless probe (common)

First check

Verify wireless probe power status

Test point: Wireless probe indicator light
Expected: Blue light solid

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

Probe gives unexpected high counts when a known gamma radiation source is present radiation

Unit detects higher than expected count rate from a known radiation source

Ranked causes

1. Incorrect radionuclide selected (common)

First check

Verify radionuclide selection matches source

Test point: Radionuclide selector
Expected: Correct radionuclide for known source

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

Service checklist completion patient safety

Requirement to complete service checklist prior to returning unit to operation

Ranked causes

1. Service completion verification needed (unknown)

First check

Verify service checklist completed

Test point: Service documentation
Expected: Service Checklist (Section 11.8) completed and signed

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

Unit not responding after servicing

If problems are observed in performance after servicing, unit is not working properly and should be evaluated.

Ranked causes

1. Servicing performed incorrectly or incompletely (unknown)

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

Unit protection during disassembly caution

Protective measures required for the volume adjustment knob and related components during service procedures.

Ranked causes

1. Mechanical shock damage to volume potentiometer (common)

First check

Use protective device for volume knob

Test point: front panel volume control
Expected: hollow circular protection device in place

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

Volume adjustment knob protection during handling caution

Precautions to protect the audio/volume adjustment knob from mechanical shock damage during disassembly and reassembly

Ranked causes

1. Mechanical shock to unprotected volume adjustment knob (common)

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

Volume adjustment not functioning

Volume control adjustment does not change audio output level

Ranked causes

1. Volume control is damaged or unplugged (common)

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

Error codes

Code	Meaning	Trigger	Severity
`Error 12`	Hardware error	Hardware component failure detection	critical
`Error 13`	Hardware error	Hardware component failure detection	critical
`Error 14`	Hardware error	Hardware component failure detection	critical
`Error 15`	Hardware error	Hardware component failure detection	critical
`Error 16`	Hardware error	Hardware component failure detection	critical
`Error 2`	General software error	Software malfunction during operation	error
`Error 7`	Sound generation error	Audio subsystem failure or malfunction	error
`Error No Probe`	Probe not connected or not detected	Probe cable disconnected or wireless probe not linked to unit	error
`No Linc`	Wireless probe link not established	Wireless probe not linked to unit	error

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.