Clinical scales

Detecto P3: troubleshooting and error codes

The ServiceForge knowledge base holds 9 documented symptoms for the Detecto P3, with 17 ranked causes, 14 diagnostic checks with test points and expected values, and 2 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Digital display shows overload error codes

Weight indicator displays OCAP, OC, or OL error without load applied

Ranked causes

1. Scale weight exceeds set capacity (occasional)
2. Indicator load cell cable damaged or disconnected (common)
3. Damaged load cell (occasional)
4. Lost or corrupted setup and calibration memory (rare)

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

Digital display shows signal range error

Weight indicator displays ErrAL (low signal) or ErrAH (high signal) error

Ranked causes

1. Load cell signal input exceeds expected range (common)
2. Damaged load cell (occasional)

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

Displayed weight does not change when load applied to platform

Scale shows same reading regardless of weight placed on platform; weight readout is static

Ranked causes

1. Packing material obstructing lever system in scale base (common)
2. Draft rod not connected in scale base (common)

First check

Inspect scale base for packing material obstruction

Test point: Interior of scale base between lever assemblies
Expected: No packing material present

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

Load cell cable continuity failure

Open circuit detected in load cell/cable assembly; weight indicator unable to receive signal from load cell

Ranked causes

1. Broken wire in load cell cable (common)
2. Poor solder connection at pins 1, 6, 2, or 7 (occasional)

First check

Continuity test load cell/cable assembly pins 1 & 6

Test point: Pins 1 & 6 of 9-pin D connector
Expected: 403 - 427 ohms, 403-427 ohms
Tools: DVM (Digital volt meter)

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

Load cell excitation voltage out of range

Voltage between pins 1 & 6 does not measure 5 VDC when indicator is powered

Ranked causes

1. Low battery or power supply failure (common)
2. Defective load cell (occasional)

First check

Measure excitation voltage between pins 1 & 6

Test point: Load cell connector pins 1 and 6 at rear panel
Expected: 5 VDC
Tools: DVM in DC voltage mode

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

Weight readings inaccurate above threshold weight

Scale readings are accurate up to a point then become lighter than actual weight; indicated weight decreases or becomes non-linear above certain load threshold

Ranked causes

1. Obstruction or interference of lever system under scale base (common)
2. Scale on carpet or padded floor causing deflection (occasional)

First check

Inspect scale base for obstructions in lever system

Test point: Bottom of scale and lever assembly area
Expected: No obstructions visible

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

Load cell signal output out of range at no load

DC millivolt reading between pins 2 & 7 with no load on platform deviates significantly from 0.5 mV or shows negative value

Ranked causes

1. Defective load cell (common)

First check

Measure DC millivolt signal between pins 2 & 7 at no load

Test point: Load cell connector pins 2 and 7
Expected: approximately 0.5 mV DC
Tools: DVM in DC millivolt mode

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

Load cell signal output out of range under load

DC millivolt reading between pins 2 & 7 with 200 lbs or 75 kg applied load deviates from expected 2.6 mV or exceeds 10 mV indicating load cell failure

Ranked causes

1. Defective load cell (common)

First check

Apply 200 lbs (75 kg) load to weighing platform

Test point: Scale platform
Expected: Load applied without obstruction
Tools: Standard test weight or known mass

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

Weight readings are inaccurate

Weight readings change when load is applied to different positions on the scale platform. Weighing platform tilts or leans to one corner.

Ranked causes

2. Broken weld on lever (occasional)

First check

Inspect scale base for equal spacing of weighing platform from base

Test point: Weighing platform corners
Expected: Equal spacing from base on all corners, no tilting or leaning

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

Error codes

Code	Meaning	Trigger	Severity
`ERRAH`	High mV signal output	mV reading above 12 mV (750/785C) or 15 mV (758C)	error
`ERRAL`	Low mV signal output	mV reading below 0.0	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.