Maintenance
Diagnostic Testing
4
4-9
1023 (DDE:FR ) A6 3.3V sense buffer fault
Suspect ICs are U21, U57, and U26 on the A6 assembly. If one of these Ics is bad, it
will cause faults on the other A6 sense buffer tests as well. Other suspects on the A6
assembly include relay K3 and resistor network Z5.
1024 (DDE:FR ) A6 33V sense buffer fault
Assuming the A6 sense buffer (3.3 V) test passed, suspects are relay K2 and resistor
network Z5.
1025 (DDE:FR ) A6 330V sense buffer fault
Assuming previous A6 sense buffer tests passed, suspects are relay K1 and resistor
network Z5.
1026 (DDE:FR ) A6 1000V sense buffer fault
Assuming previous A6 sense buffer tests passed, the suspect IC is U60.
1027 (DDE:FR ) A6 trim DAC 0 (3.3V) fault
Suspects include U17, U4, U25, U42, R3, R45, R51, R50, R22, and C133 on the A6
assembly.
1028 (DDE:FR ) A6 trim DAC 0 (33V) fault
Suspects include U17, U4, U25, U42, R3, R45, R51, R50, R22, and C133 on the A6
assembly.
1029 (DDE:FR ) A6 trim DAC 1 fault
Suspects include U18, U34, R131, R142, R143, and C126 on the A6 assembly.
1030 (DDE:FR ) A8 33V DC offset fault
The primary suspect IC is U1 on the A8 assembly.
1031 (DDE:FR ) A8 330V AC low F fault
Suspects include transformer T3, U16, and U13.
1032 (DDE:FR ) A8 330V AC high F fault
Suspects include transformer T2 and U4.
1033 (DDE:FR ) A8 330V DC fault
Suspects include CR4 through 6, CR16, CR19, CR20, C2, and C24 on the A8 assembly.
1034 (DDE:FR ) A8 1000V AC low F fault
Suspects include transformer T3, U16, and U13 on the A8 assembly.
1035 (DDE:FR ) A8 1000V AC high F fault
Suspects include transformer T2 and U4 on the A8 assembly.
1036 (DDE:FR ) A8 1000V DC fault
Suspects include CR4 through 6, CR16, CR19, CR20, C2, and C24 on the A8 assembly.
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