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.

7-7

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Fluke 5725A instruction manual Analog Monitor Faults, Fault no Message

5725A specifications

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