Test equipment and power supplies

Agilent 6023A: troubleshooting and error codes

The ServiceForge knowledge base holds 13 documented symptoms for the Agilent 6023A, with 32 ranked causes, 67 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

Front-panel display error or control failure

Display digits missing, display settings error, volts or amps reading incorrect, decimal point wrong, or potentiometer controls ineffective

Ranked causes

1. Display LED segment failure (common)
2. Display input buffer or decoder IC failure (common)
3. Decimal point driver failure (occasional)
4. Front-panel potentiometer failure (occasional)

First check

Visually inspect display LEDs

Test point: A3DS1 through A3DS7
Expected: All segments light during power-on self-test
Tools: Visual inspection

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

AC turn-on relay not closing high voltage

Relay A1K1 fails to close 1.0 seconds after power applied; DROPOUT signal does not go high at 1.1 seconds; prevents PWM enable

Ranked causes

1. Bias voltage detector failure (common)
2. 1-second delay circuit malfunction (occasional)
3. Relay driver or relay A1K1 failure (occasional)

First check

Verify 5V unreg bias supply present

Test point: A2J3-1
Expected: 5.0Vdc after 2s wait
Tools: DMM

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

Bias supply voltage incorrect or absent high voltage

Measured bias supply voltages (+5V, +15V, -15V, +8.9V, +2.5V) deviate from specification or are absent at test points on A2 control board

Ranked causes

1. +5V supply circuit failure (common)
2. +15V regulator or filter failure (common)
3. -15V regulator failure (common)

First check

Measure +5V input voltage

Test point: A2J3-22
Expected: ≈ 20Vdc
Tools: DMM

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

DC-to-DC converter not switching high voltage

Power MOSFET gate signals not present or incorrect waveforms; output power not being generated from 40V input

Ranked causes

1. PWM-ON or PWM-OFF drive signals missing or incorrect (common)
2. PFET gate driver circuit failure (common)
3. Pulse transformer drive coupling failure (occasional)

First check

Verify 40V supply to converter

Test point: A4Q2-D to A4Q4-S
Expected: 39Vdc, ±1 V
Tools: DMM

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

Output current regulation failure high voltage

Output current does not reach specified maximum; constant current control not functioning properly; may oscillate with inductive loads

Ranked causes

1. CC monitor amplifier failure (common)
2. CC Error Amplifier or feedback network fault (common)
3. CC loop differentiator circuit instability (occasional)

First check

Measure I-MON at 3.0A input current

Test point: A2U2B-7
Expected: 0.50Vdc, ±0.05 V
Tools: DMM

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

Output voltage oscillation in CV regulation high voltage

Output voltage oscillates when under constant voltage control; system unstable particularly with capacitive loads

Ranked causes

1. CV Error Amplifier circuit oscillation (common)
2. CV loop compensation network failure (occasional)
3. Capacitive load interaction with CV circuit compensation (occasional)

First check

Measure CV monitor output voltage

Test point: A2U10C-8 (V-MON)
Expected: 3.75Vdc, ±0.25 V
Tools: DMM

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

PWM or clock circuit malfunction high voltage

Pulse width modulator does not generate correct output pulses or 20KHz clock not functioning; prevents power stage operation

Ranked causes

1. PWM inhibit gate inputs stuck low (common)
2. Clock generator failure (common)
3. Power limit circuit preventing PWM (occasional)

First check

Check inhibit gate input 1

Test point: A2U19-1
Expected: Hi (≥ 5Vdc TTL)
Tools: DMM

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

Unit fails turn-on self-test or shows malfunction indication high voltage

Power supply gives malfunction indication, fails self-test, or does not operate as expected

Ranked causes

1. Input power unavailable or circuit breaker tripped (common)
2. Incorrect mode switch settings (common)
3. Loose or interrupted connections to power supply (common)

First check

Verify input power availability

Test point: Power cord inlet and rear-panel circuit breaker
Expected: AC power present at power cord inlet; circuit breaker in ON position

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

No output from power supply high voltage

Unit produces no output voltage or current; load receives no power

Ranked causes

1. A4Q3 and A4Q4 PFET failure or fuses A4F1/A4F2 open (common)
2. Absence of 320Vdc rail voltage (common)

First check

Verify bias voltages and PWM control signals present

Test point: A2J3 control board test connector fingers
Expected: PWM-ON and PWM-OFF per Table 3-1; bias voltages stable

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

Performance failure: output present but out of specification high voltage

Power supply produces output but measurements do not meet specifications; voltage or current regulation poor

Ranked causes

1. Front-panel board A3 defective (common)
2. Functional circuit defect in control or converter stages (occasional)

First check

Verify measurements at A2J7 control board test connector

Test point: A2J7 test connector
Expected: All signals and voltages per Table 3-1 (±5% unless range given)

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

Low or missing output voltage at test points high voltage

Voltage reading at control board test connector A2J7 does not match expected value

Ranked causes

1. Regulator or reference circuit fault (common)

First check

Measure +5V at test connector A2J7 pin 1

Test point: A2J7 pin 1
Expected: 5.0 V, +/-0.25 V
Tools: DMM

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

Output current oscillation

Output current oscillates during normal operation

Ranked causes

1. Differentiator circuit at fault (common)

First check

Verify oscillations stop after R16 removal

Test point: Output
Expected: Oscillations stop

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

Status signal incorrect at control board test points

Status signal (CV, CC, OV, DROPOUT, OT) indicates wrong operational state at test connector

Ranked causes

1. Comparator or status logic circuit failure (occasional)

First check

Check CV (constant voltage) status at pin 17

Test point: A2J7 pin 17
Expected: TTL Lo if in CV operation
Tools: DMM or logic probe

4 more checks with pass and fail actions, 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.