E8257D/67D, E8663D PSG Signal Generators Service Guide 25
Troubleshooting
Self–Test Failures and Related Troubleshooting
Self–Test Failures and Related Troubleshooting
Self–test results are valid only when all external cables and connectors are
removed from the PSG.
Table 1-4 Self–test Failures and Related Troubleshooting
If this self–test fails... Go to this troubleshooting section...
A13 I/Q Multiplexer “Self–Tests 1xx for the A13 I/Q Multiplexer” on page 55
100 Power Supply
101 CAL Source
102 Ext In Offset DAC and Switch
103 Path 1 & 2 and Ext Out
104 Path 1: Attenuators and Summing Amp
105 Path 2: Attenuators and Summing Amp
106 DC–Couple Mode, CW bias DAC,
Course+Fine DAC
107 Drift Canceller
108 IQ Polarity Switch
109 RMS to DC Converter
110 (not used)
111 Wideband Path Test
A5 Sampler “Self–Tests 2xx: A5 Sampler Self–Test Errors” on page 58
200 Power Supply
201 Tuning + Bias Test
202 Coarse Loop Detector
203 YO Loop Detector
A7 Reference (Std.) “Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (For
instruments with serial prefixes < US4805/MY4805)” on page 60
300 1 GHz Detector
301 Tuning Voltage
A8 Output “Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only)” on
page 61
400 Ground and PTAT Test
401 Prelevel Loop Test
402 Quadrature DAC Test
403 VBLO Test
404 Marble Test
405 Gain Adjustment Test
406 Prelevel Bypass Test
407 Switched Filters Test
408 (not used)
409 ALC Modulation Test
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