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Troubleshooting 53
CV/CC Status Annunciators Troubleshooting
When troubleshooting the CV/CC status annunciators or status readback circuits, first measure the voltage drop across the
gating diodes, which are Al0D651 for the CC circuit and Al0D652 for the CV circuit (see A10, Sheet 2). A conducting
diode indicates an active (ON) control circuit. This forward drop is applied to the input of the associated status comparator
(A10U502) and drives the output low. The low signal indicates an active status which is sent to the secondary
microprocessor A10U506 via Programmed GAL Al0U505 (see schematic Sheet 1). The front panel CV annunciator lights
when the CV mode is active (CV is low) and the CC annunciator lights when the CC mode is active (CC is low). If neither
is active, the UNREGULATED (Unr) annunciator comes on.
A3 FET Board Troubleshooting
Because test points on the FET board are not accessible when the board is installed, troubleshooting must be performed
with the board removed from the power supply. Both static (power removed) and dynamic (power applied) troubleshooting
procedures are provided. The location of different test points are shown by encircled numbers on the A3 FET Board
schematic and component location diagrams (see Chapter 6). There are two isolated FET bridge assemblies (see schematic
in Fig. 6-10 sheets 1 and 2). Test each FET bridge individually.
Note If any power FET (Q201-204, Q301-304, Q211, Q311, Q222, Q322, Q233, Q333, Q244, Q344) is
defective, you must replace all eight with a matched set.
Table 3-4. FET Troubleshooting Chart
Procedure Result
Static Troubleshooting
1. Turn the power supply off and remove the A3 FET board with its heatsink assembly
attached (see "Disassembly Procedures").
2. Measure the resistance between the + Rail (E202 & E302) and the - Rail ( E201 &
E301).
≥ 20MΩ.
3. Measure the resistance between the gate of each FET
(Q201-204, Q211, Q222, Q233, Q244, and Q301-304, Q311, Q322, Q333, and Q344) and
common (-Rail).
>15KΩ.
4. Measure the resistance across capacitor C201 & C301.
≈ 150Ω.
5. Measure the resistance across the 15V bias input (E206 to E207 and E306 to E307).
≈ 1KΩ in the forward
direction and 490Ω in the
reverse direction.
Continue with Dynamic Troubleshooting on the next page
- SERVICE MANUAL 1
- GPIB DC Power Supplies 1
- Agilent Series 668xA 1
- CERTIFICATION 2
- WARRANTY 2
- LIMITATION OF WARRANTY 2
- EXCLUSIVE REMEDIES 2
- ASSISTANCE 2
- SAFETY CONSIDERATIONS 3
- Safety Symbol Definitions 4
- Printing History 4
- Table of Contents 5
- Related Documents 8
- Manual Revisions 8
- Safety Considerations 9
- Conventions 9
- Electrostatic Discharge 9
- Verification 10
- Electronic Load 11
- Programming The Tests 12
- General Considerations 12
- Operation Verification Tests 13
- Performance Tests 13
- Constant Voltage (CV) Tests 13
- Verification 15 14
- Constant Current (CC) Tests 18
- 22 Verification 21
- Verification 23 22
- Averaging the CC Measurements 23
- Troubleshooting 30
- Test Equipment Required 31
- Troubleshooting Procedures 31
- Power-On Selftest 31
- Troubleshooting Charts 33
- Troubleshooting Test Points 33
- Bias and Reference Supplies 33
- Troubleshooting 35 34
- 36 Troubleshooting 35
- Troubleshooting 37 36
- 38 Troubleshooting 37
- Troubleshooting 39 38
- 40 Troubleshooting 39
- Troubleshooting 41 40
- 42 Troubleshooting 41
- Troubleshooting 43 42
- 44 Troubleshooting 43
- Troubleshooting 45 44
- 46 Troubleshooting 45
- Troubleshooting 47 46
- 48 Troubleshooting 47
- Troubleshooting 49 48
- 50 Troubleshooting 49
- Troubleshooting 51 50
- 52 Troubleshooting 51
- A3 FET Board Troubleshooting 52
- Troubleshooting 55 54
- Signature Analysis 55
- Introduction 55
- Firmware Revisions 55
- Test Headers 56
- Troubleshooting 59 58
- EEPROM Initialization 62
- Disassembly Procedures 67
- Tools Required 67
- Top Cover 68
- GPIB Board 68
- A4 AC Input Assembly 69
- A5 DC RAIL Assembly 69
- A6 BIAS Assembly 69
- A3 FET Board 69
- A1DSP1 LCD Display 71
- A1G1 and A1G2 Rotary Controls 71
- A1KPD Keypad 71
- Troubleshooting 73 72
- 74 Troubleshooting 73
- Troubleshooting 75 74
- 76 Troubleshooting 75
- Troubleshooting 77 76
- 78 Troubleshooting 77
- Troubleshooting 79 78
- 80 Troubleshooting 79
- Principles Of Operation 80
- A1 Front Panel Assembly 81
- A10 Control Board 81
- A4 AC Input Board 84
- A5 DC Rail Board 84
- Output Circuits 85
- Principles Of Operation 87 86
- Replaceable Parts 87
- How to Order Parts 88
- Diagrams 113
- General Schematic Notes 117
- 120 Diagrams 118
- Diagrams 121 119
- 122 Diagrams 120
- Backdating 146
- Backdating 153 150
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