Samsung OFFICESERV 7100 Service Manual page 125

3.4.6.2 Processor Operation is Abnormal
The procedure for resolving the problem caused by abnormal processor operation of
TEPRI2 board is as follows:
Start
Over one LED(s) is(are)
in ON status?
Yes
CPU clock is normal?
Yes
RESET signal is HIGH?
Yes
DTACK signal is
ACTIVE(LOW) ?
Yes
Check ADDRESS/DATA BUS
BUS is normal?
Yes
Y2 signal is normal?
Yes
End
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- Refer to '3.1.1 Checking Basic
No
Cabinet Power '.
- Check 30PIN connector status.
No
Y1 output is abnormal: Reaplce Y1
- Replace with U3(DS1706) or
No
U5(CPLD) if STEADY LOW
- Check CPU ADDR/DATA BUS if
VIBRATION
No If PIN602 of DPRAM(U14) is
STEADY LOW, replace U14 or
upgrade to final program
No
Repair BUS
(SHORT, OPEN, PORT FAIL)
No
Replace Y2
OfficeServ 7100 Service Manual
3-31