E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-30
104 Path 1: Attenuators and Summing Amp
• Replace the A13 I/Q Multiplexer
105 Path 2: Attenuators and Summing Amp
• Replace the A13 I/Q Multiplexer
106 DC–Couple Mode, CW bias DAC, Course+Fine DAC
• Replace the A13 I/Q Multiplexer
107 Drift Canceller
• Replace the A13 I/Q Multiplexer
108 IQ Polarity Switch
• Replace the A13 I/Q Multiplexer
109 RMS to DC Converter
• Replace the A13 I/Q Multiplexer.
110 Not Used
111 Wideband Path Test
Use an oscilloscope to check A13 I/Q Multiplexer output.
1. Disconnect the cable from A13J10.
2. Probe A13J10 while executing self test 111, for a square wave, 300 ms at +0.7V and 300 ms at –0.7V.
• If a square wave is not present on A13J10, replace the A13 I/Q Multiplexer board.
• If a square wave is present at A13J10, continue to step 3.
3. Reconnect the cable to A13J10.
4. Disconnect the cable from A31J1052.
5. Probe A31J1052 while executing self test 111, for a square wave on the center pin, 300 ms at +0.7V and 300 ms at
–0.7V.
• If a square wave is not present on A31J1052, replace the W132 cable.
• If a square wave is present at A31J1052, replace the A8 Output board.
6. Disconnect the cable from A13J9.
7. Probe A13J9 while executing self test 111, for a square wave, 300 ms at +0.7V and 300 ms at –0.7V.
• If a square wave is not present on A13J9, replace the A13 I/Q Multiplexer board.
• If a square wave is present at A13J9, continue to step 3.
8. Disconnect the cable from A31J1053.
9. Probe A31J1053 while executing self test 111, for a square wave on the center pin, 300 ms at +0.7V and 300 ms at
–0.7V.
• If a square wave is not present on A31J1053, replace the W131 cable.
• If a square wave is present at A31J1053, replace the A8 Output board.
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