OfficeServ 7100 Service Manual
© SAMSUNG Electronics Co., Ltd.
3-11
3.2.2 -54
V Power is not Supplied to Motherboard
The procedure for resolving the problem that occurs when -54 V power is not supplied to
the motherboard is as follows:
Is DRAIN -SOURCE
power of FET below 1
V?
No
Yes
No
Yes
No
Yes
Is the No. of ports proper?
No
Yes
Check if the No. of ports
mounted on board exceeds
the power supply board capacity.
Is the board detected?
No
Yes
- Replace two transistors driving FET.
- Reaplce FET.
Replace the power supply board.
Change the No. of ports.
Check the ADDRESS, DATA BUS,
EN, WR signals of the board.
Is the TIP-RING
power of DLI or SLI generated
below 39 V?
In DLI board,
is POWER CONTROL of the
corresponding slot ON?
Check if the corresponding board
is recognized through MMC 859
H/W version display program.
- Replace the -54 V series diode.
- Replace the 82 V varistor.
- Replace the DLI board.
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