Samsung OFFICESERV 7100 Service Manual page 152

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3.5.2.3 Abnormal Operation of Some DSPs of the MFM Board
The method to solve the problem when some DSPs of the MFM board do not operate is as
follows:
Test the operation(U1~U3) of each IC
via the program for displaying the MMC
850 system resource.
Does the DTMF SENDER
operate?
Yes
Does the DTMF RECEIVER
operate?
Yes
End
3-58
No
Check the highway for the SENDER.
Check CHIP SELECTION.
Detect the bad IC in the program
No
for displaying the MMC 850
system resource.
Check the highway for the
Check CHIP SELECTION.
(U1~U3 PIN45/46)
Replace the corresponding IC.
(U1 PIN45/46)
Replace U1.
RECEIVER.
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