30 E8257D/67D, E8663D PSG Signal Generators Service GuideTroubleshootingTroubleshooting Assembly–Level ProblemsTroubleshooting Assembly–Level ProblemsThis section provides the following:— “Front–Panel Display Assembly Troubleshooting” on page 30— “Power Supply Troubleshooting” on page 37— “Option 008/009 Troubleshooting” on page 54— “Self–Tests 1xx for the A13 I/Q Multiplexer” on page 55— “Self–Tests 2xx: A5 Sampler Self–Test Errors” on page 58— “Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (Forinstruments with serial prefixes < US4805/MY4805)” on page 60— “Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only)” on page 61— “Self–Tests 6xx: A9 YIG Driver Self–Test Errors” on page 64— “Self–Tests 7xx: A6 Frac–N Self–Test Errors” on page 67— “Self–Tests 9xx: A10 ALC Self–Test Errors” on page 71— “Self–Tests 10xx: A7 Reference (Option UNR/UNX and Instruments withSerial Prefixes ≥ US4805/MY4805) Self–Test Errors” on page 74— “Self–Tests 11xx: A18 CPU Self–Test Errors” on page 76— “Self–Tests 12xx: A26 MID Self–Test Errors (E8257D)” on page 77— “Self–Tests 12xx: A26 MID Self–Test Errors (E8267D)” on page 83— “Self–Tests 13xx: A11 Analog/Pulse Modulation Generator Self–TestErrors” on page 89— “Self–Tests 16xx for the A14 Baseband Generator (Option 601/602)” onpage 92— “Self–Tests 22xx: A8 Output Self–Test Errors” on page 95— “Self–Tests 24xx: A38 Lowband Filter Self–Test Errors” on page 97— “Self–Tests 25xx: A43 Amp Filter Self–Test Errors” on page 98— “Self–Tests 26xx: A8 Output Self–Test Errors” on page 100Front–Panel Display Assembly TroubleshootingOverviewThe Front–Panel Display Assembly comprises the following:— a 640 x 320 pixels liquid crystal display (LCD)— a power switch/flat panel interface board, which contains the power on/offswitch, standby LED, and power–on LED
