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3 - Troubleshooting
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Test Equipment Required
Table 3-1 lists the test equipment required to troubleshoot the power supply. Recommended models are
listed.
Table 3-1. Test Equipment Required for Troubleshooting
Type Purpose Recommended Model
GPIB Controller To communicate with the supply via the
GPIB interface HP Series 300
Digital Voltmeter To check various voltage levels Agilent 3458A
Oscilloscope To check waveforms and signal levels Agilent 54504A/54111A
Electronic Load To test operation of current circuit Agilent 6060B
IC Test Clips To access IC pins AP Products No. LTC
Ammeter/Current
Shunt To measure output current Guildline 9230/15
Overall Troubleshooting
Overall troubleshooting procedures for the power supply are given in the Figure 3-1. The procedures first
check that neither an AC input, nor a bias supply failure is causing the problem and that the supply passes
the turn-on self test (error annunciator stays off). The normal turn-on, self-test indications are described in
the "Checkout Procedure" in Chapter 3 of the User's Guide.
If the supply passes the self test and there are no obvious faults, you should perform the verification
procedures in Chapter 2 from the front panel to determine if any functions are not calibrated or are not
operating properly. Then program and read back a voltage via the GPIB to see if the supply responds
properly to bus commands. If the supply fails any of the tests, you will be directed to the applicable flow
chart or troubleshooting procedure.
Flow Charts
Troubleshooting flow charts are given in Figure 3-1 sheets 1-13. Several flow charts make reference to the
test points listed in Chapter 6. The circuit locations of the test points are shown on the schematics and on
the component location diagrams in Chapter 6.