Samsung OFFICESERV 7100 Service Manual page 156

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3.5.3.4 Abnormal Operation of Some DSPs of the RCM Board (2)
When the problem has occurred in the DSP of the RCM board, if the problem is not solved
after performing the contents as '3.5.3 3 Abnormal Operation of Some DSPs of the RCM
Board(1)' on the previous page, check the following items.
Test the operation(U1~U3) of each
IC via the program for displaying the
MMC 850 system resource.
Does the R2 SENDER operate?
Yes
Does the RS/CID RECEIVER
operate?
Yes
Check the ADDRESS/DATA
buffer signal.
3-62
No
Check the highway for the SENDER.
Check CHIP SELECTION.
Detect the bad IC in the
No
program for displaying
the MMC 850 system resource.
Check the highway for the
Check CHIP SELECTION.
(U1, U2 PIN, U5 PIN45/46)
Replace the corresponding IC.
(U5 PIN45/46)
Replace U1.
RECEIVER.
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