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98770 Troubleshooting 4-5
Minimum Configuration Tests
Use this procedure when the unit has an inoperative power supply or will not indicate the
presence of
±
15 Volts dc, or when primary wiring defects are suspected.
Minimum Configuration
Minimum configuration consists of:
1. Base assembly and mother board.
2. Power supply and primary wiring.
3. A5 board (98770-66505).
4. A44 board (98770-66544).
5. Turn on fixture or installed on Computer.
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CAUTION
DO NOT RUN UNIT IN MINIMUM CONFIGURATION FOR MORE
THAN 30 SECONDS AT A TIME. (MINIMUM PLUS A33 BOARD
CAN BE RUN INDEFINITELY)
To achieve minimum configuration, remove:
1. The A6 board (98770-66506).
2. The All board (98770-66511).
3. The A32 board (98770-66532).
4. The A33 board (98770-66533/13/53/54).
5. The 98775-66501166504 board
if
present.
6. Three 503 boards (98770-66503). Note the order of removal to avoid reconvergence.
7. The 502 board (98770-66502).
8. Remove the CRT assembly (be careful to disconnect YOKE wiring under the CRT).
Preliminary Procedure
Plug unit into power source and listen to "wake-up" sounds as you turn unit on (ignore LEOS
when base is turned OFF):
a. Relay closure click in top.
b. All fans turning.
c. Steady beep from base is normal. There is no handshake.
d. Watch LED's.
If
any LED lit, do A5 and Power Supply Procedure. #4 LED in right
indicator group normally lit (brite).
e. Retest.
If
LED still lit. replace A44 or Mother board (Rare).
f. Unplug unit.
Unit must pass the minimum configuration tests before proceeding to next page.
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