Test equipment AC power analyzers · Agilent AC Power family

Agilent 6814B: troubleshooting and error codes

The ServiceForge knowledge base holds 16 documented symptoms for the Agilent 6814B, with 21 ranked causes, 9 diagnostic checks with test points and expected values, and 15 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

One or more AC outputs missing high voltage

One or more of the three phase outputs (Phase A, B, or C) is not present at terminals

Ranked causes

1. 300 Vdc power supply is not present (common)
2. Bias voltages are missing or incorrect (common)
3. A4 mother board common mode inductor open (occasional)

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

Relays do not energize on A9 Input assembly caution

No relay clicking sound; relays fail to activate when power applied

Ranked causes

1. A9 1/4 amp fuse is open (common)
2. 24 volt bias is missing (Option 400 models) (common)
3. A14 fuses F1, F2, F3 are open (common)

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

Display present but communication with front panel not working

Display is lit but does not respond to button presses or shows no status changes

Ranked causes

1. Analog supply voltages are low or missing (common)
2. A8 DSP assembly communication failure (occasional)

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

No 300 Vdc power supply output high voltage

300 Vdc rail is absent or below expected voltage on C1

Ranked causes

1. Input fuses or rectifier components failed (common)

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

No front panel display despite relays and fans active caution

Unit powers up with relay clicks and fan operation but display remains blank

Ranked causes

1. +5VDC power supply to display is missing (common)

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

No front panel display, no fans, no relay click caution

Unit powers on but display is dark, fans do not run, no relay activation sound

Ranked causes

1. Input fuses F1, F2, F3 are open (common)

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

Switching amplifier output gains unbalanced after replacement high voltage

Phase B and C amplifier gains do not match phase A, causing unequal current sharing when amplifiers are paralleled as single-phase output

Ranked causes

1. Amplifier A2 or A3 replaced without gain adjustment (common)

First check

Verify phase A output voltage (6834B only)

Test point: Phase A output to common
Expected: 300 V nominal

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

Turn-on self test error: DAC self test failed

Error 11 to 18 displayed during power-on self test, indicating DAC self tests 1 through 8 failure

Ranked causes

1. DAC self test failed (unknown)

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

Turn-on self test error: Non-volatile RAM CAL section checksum failed

Error 3 displayed during power-on self test

Ranked causes

1. Non-volatile RAM CAL section checksum failed (unknown)

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

Turn-on self test error: Non-volatile RAM CONFIG section checksum failed

Error 2 displayed during power-on self test

Ranked causes

1. Non-volatile RAM CONFIG section checksum failed (unknown)

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

Turn-on self test error: Non-volatile RAM LIST STATE section checksum failed

Error 6 displayed during power-on self test

Ranked causes

1. Non-volatile RAM LIST STATE section checksum failed (unknown)

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

Turn-on self test error: Non-volatile RAM RD0 section checksum failed

Error 1 displayed during power-on self test

Ranked causes

1. Non-volatile RAM RD0 section checksum failed (unknown)

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

Turn-on self test error: Non-volatile RAM STATE section checksum failed

Error 5 displayed during power-on self test

Ranked causes

1. Non-volatile RAM STATE section checksum failed (unknown)

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

Turn-on self test error: Non-volatile RAM WAVEFORM section checksum failed

Error 4 displayed during power-on self test

Ranked causes

1. Non-volatile RAM WAVEFORM section checksum failed (unknown)

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

Turn-on self test error: RAM selftest failed

Error 10 displayed during power-on self test

Ranked causes

1. RAM selftest failed (unknown)

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

Unit does not deliver full output power caution

AC Power Source operates but output power capability is reduced

Ranked causes

1. AC input mains fuses on rear panel open (common)

First check

Inspect rear panel input mains fuses

Test point: Rear panel fuse locations
Expected: All fuses intact and functional

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

Error codes

Code	Meaning	Trigger	Severity
`Error 1`	Non-volatile RAM RD0 section checksum failed	Power-on self test	error
`Error 10`	RAM selftest failed	Power-on self test	critical
`Error 11`	DAC self test 1 failed	Power-on self test	critical
`Error 12`	DAC self test 2 failed	Power-on self test	critical
`Error 13`	DAC self test 3 failed	Power-on self test	critical
`Error 14`	DAC self test 4 failed	Power-on self test	critical
`Error 15`	DAC self test 5 failed	Power-on self test	critical
`Error 16`	DAC self test 6 failed	Power-on self test	critical
`Error 17`	DAC self test 7 failed	Power-on self test	critical
`Error 18`	DAC self test 8 failed	Power-on self test	critical
`Error 2`	Non-volatile RAM CONFIG section checksum failed	Power-on self test	error
`Error 3`	Non-volatile RAM CAL section checksum failed	Power-on self test	error
`Error 4`	Non-volatile RAM WAVEFORM section checksum failed	Power-on self test	error
`Error 5`	Non-volatile RAM STATE section checksum failed	Power-on self test	error
`Error 6`	Non-volatile RAM LIST STATE section checksum failed	Power-on self test	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.