Fluke 5500A, Service Manual

Page: 109 / 296

Maintenance
Diagnostic Testing
4
4-13
1083 (DDE:FR ) A7 Overcurrent fault +330 mA
Suspects include K16, K17, R88, and R92 on the A7 assembly.
1080 (DDE:FR ) A7 Undercurrent fault -330 mA
Suspects include R102, R105, Q2, Q8, and U13 on the A7 assembly.
1081 (DDE:FR ) A7 Overcurrent fault -330 mA
Suspects include R102, R105, Q2, Q8, and U13 on the A7 assembly.
1086 (DDE:FR ) A7 Undercurrent fault +2.2A
Suspects include R24 and R34 on the A7 assembly.
1087 (DDE:FR ) A7 Overcurrent fault +2.2A
The primary suspect is R34 on the A97 assembly.
1084 (DDE:FR ) A7 Undercurrent fault -2.2A
The primary suspect is R24 on the A7 assembly.
1085 (DDE:FR ) A7 Overcurrent fault -2.2A
The primary suspect is R24 on the A7 assembly.
1088 (DDE:FR ) A7 Aux amp fault
Suspects include R6, R7, R44, R46, and U8 on the A7 assembly.
1089 (DDE:FR ) A7 Monitor fault (+DC)
Suspects include R18, R38, R43, R48, R52, R57, C67, CR11, and U22 on the A7
assembly.
1090 (DDE:FR ) A7 Monitor fault (-DC)
Suspects include CR9 and U22 on the A7 assembly.
4-13. Testing the Front Panel
Press
S
followed by UTILITY FUNCTNS, SELF TEST, and FRONT PANEL. The
menu presents the following choices: KNOB TEST, KEY TEST BELL TEST, and
DISPLAY. These tests are described next:
•
KNOB TEST -- Tests the knob encoder by showing a cursor that moves whan you
turn the knob.
•
KEY TEST -- Lets you check the proper functioning of each key. When you press a
key, the name of the key shows on the display. Press PREV MENU to exit this test.
•
BELL TEST -- Lets you ring the bell (beeper) for various timed periods.
•
DISPLAY -- Checks all the segments of the two displays.