54 V Power Is Not Supplied To Motherboard - Samsung OFFICESERV 7100 Service Manual

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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:
Check if the corresponding board
is recognized through MMC 859
H/W version display program.
Is the board detected?
Yes
Check if the No. of ports
mounted on board exceeds
the power supply board capacity.
Is the No. of ports proper?
Yes
Is the TIP-RING
power of DLI or SLI generated
below 39 V?
Yes
In DLI board,
is POWER CONTROL of the
corresponding slot ON?
Yes
Is DRAIN -SOURCE
power of FET below 1 V?
Yes
- Replace the -54 V series diode.
- Replace the 82 V varistor.
© SAMSUNG Electronics Co., Ltd.
No
Check the ADDRESS, DATA BUS,
EN, WR signals of the board.
No
Change the No. of ports.
No
Replace the power supply board.
No
- Replace the DLI board.
No
- Replace two transistors driving FET.
- Reaplce FET.
OfficeServ 7100 Service Manual
3-11

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