Fluke 5725A Manual Tests for Fault Isolation, 2.Analog Monitor Faults, Fault No, Message

Troubleshooting 7

Manual Tests for Fault Isolation

7-5. Problems 1 or 2: Fault at Power-Up or When Entering Voltage Standby

Proceed as follows to isolate the problem in these conditions:

1.If the 5700A is reporting a fault, determine if it is an analog monitor fault from Table 7-2. If the fault is not in Table 7-2, skip to step 2. (See Table 7-1 for explanations of fault codes.)

		Table 7-2. Analog Monitor Faults
FAULT NO.					MESSAGE
209	5725		Current Heatsink Too Hot
210		Output Tripped To Standby
211	5725		Current Compliance Voltage Too High
212	5725		Current Compliance Voltage Too High
213	5725		+400V		Supply Did Not Shut Off
214	5725		-400V	Supply Did Not Shut Off
215	5725		Voltage Heatsink Too Hot
216		Output Tripped To Standby
217	5725		+400V		Supply Too Low
218	5725		+400V		Supply Too High
219	5725		-400V	Supply Too Negative
220	5725		-400V	Supply Too Positive
221	5725		+400V		Supply Current Too High
222		Output Tripped To Standby
223	5725		-400V	Supply Current Too High
224		Output Tripped To Standby
225	5725		Fan Not Working

a.With an oscilloscope, check TP152 (DAC OUT) for the waveform shown facing Section 9 with the High Voltage Sense Assembly (A6) schematic.

b.If the waveform is present, suspect an abnormal analog input into U151 on the High Voltage Sense Assembly (A6). See Table 4-3 for voltage limits of the analog inputs for standby operation.

c.If the waveform is not present, short TP510 to DCOM on the Digital assembly. This tells the CPU to ignore all analog monitor faults and run all other tests. Check for any new fault codes that indicate the problem.

d.If the waveform is still not present, the High Voltage Sense Assembly (A6) is likely to be at fault, specifically, the circuitry that includes U151, U155, U156, U153, and U154.

2.If not an analog monitor fault, is it a high voltage supply (Fault 234) or CLAMPS* (Fault 226) fault? If yes and in standby mode, suspect the Power Supply assembly (A4). If yes and in voltage standby mode, suspect the High Voltage Amplifier (A3) and the high voltage output transistors.

3.If the error on the 5700A is not an analog monitor fault, high voltage supply (Fault 234), or CLAMPS* (Fault 226) fault, or if no fault is reported by the 5700A, check for communications activity at pins 12 and 13 of U507 on the Digital assembly (A5). The waveform should appear as shown facing the Digital schematic as waveform 4. If there is no activity, suspect the communication circuitry on the High Voltage Sense Assembly or the Digital assembly.

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