Samsung OFFICESERV 7100 Service Manual page 147

3.5.1.2 When RELAY Cannot Be Controlled
The method to solve the problem when RELAY cannot be controlled is as follows:
Check if the control signal is
properly output from CPLD.
Is the control signal normal?
Yes
Operate the corresponding
TRANSISTOR and check its status.
Does the TRANSISTOR operate
normally?
Yes
Is the RELAY sound generated?
Yes
End
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No
Check ADDRESS, DATA BUS.
No
Replace the TRANSISTOR and input
resistance.
No
- Check if +5 V is supplied to RELAY.
- Replace RELAY.
OfficeServ 7100 Service Manual
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