Fluke 5220A Bedienungsanleitung PDF herunterladen (Seite 68)

5 220A

Instruction Manual

4-22

Table 4-6. Mainframe and Digital Section Troubleshooting Guide (cont.)

Step Instruction Yes No Go to

15 Check the line voltage switch settings on A2 Transformer

Assembly. They should be set to comply with the local line

voltage. If some voltages are in limits and some are out, the

problem is on the A4 Regulator or the A3 Cap Bus. If a voltage is

low, check for power supply loading. If a voltage is high, the

regulator IC is likely the cause.

Front Panel Tests

16 Complete the Front Panel Tests described earlier under

Performance Test.

17 Does the 5220A respond as described in the Front Panel Tests?

18 Do one or more LEDs light? 20 19

19 Operating voltage (+5 V dc) is not present at either the A9 Front

Panel PCB or the A10 Logic PCB. Repair as required.

20 Can the standby/operate modes be selected?

Note

The jumper wire must be installed between the

enabled output terminals.

21 Is the OVERCURRENT or OVERCOMPLIANCE LED lit? 23 22

22 Defective switch, LED, or standby/operate circuit (on the A10

Logic PCB).

23 Set the POWER switch to OFF, then ON.

24 Is the OVERCURRENT or OVERCOMPLIANCE LED lit? 34 25

25 Connect a 0.1 Ω resistor between the selected output terminals,

then connect a DVM across the 0.1 Ω resistor.

26 Connect a jumper wire between TP4 (Turn on 1) on the A8

Analog Control PCB and TP7 (-15 V) on the A4 Regulator PCB.

27 With the 5220A in standby, adjust R6 on the A6 Driver for a DVM

reading of 0 V ±1.0 mV.

28 Can a 0 V DVM reading be obtained? 30 29

29 The A6 Driver and/or A7 Output Assemblies are defective.

Repair as required.

30 The A6 Driver and A7 Output Assemblies are functional.

Remove the jumper from between TP4 and the A8 Analog

Control PCB and TP17 on the A4 Regulator.

31 Press the STBY/OPR switch. 32

32 Can the operate mode be selected? 33 34

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Fluke 5220A Bedienungsanleitung Seite 68