56 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
100 Power Supply
— If all power supply voltages are good on the A31 Motherboard, replace the
A13 I/Q Multiplexer.
— If any of the supply voltages are bad on the A31 Motherboard, check the
origin of that supply.
— If the supply voltage is good at the origin, replace the A31
Motherboard.
— If the supply voltage is bad at the origin, troubleshoot the origin.
101 CAL Source
— Replace the A13 I/Q Multiplexer.
102 Ext In Offset DAC and Switch
— Replace the A13 I/Q Multiplexer
103 Path 1 & 2 and Ext Out
— Replace the A13 I/Q Multiplexer
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
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