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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.
No
Yes
No
Yes
Check the highway for the SENDER.
Check CHIP SELECTION.
(U5 PIN45/46)
Replace U1.
Detect the bad IC in the
program for displaying
the MMC 850 system resource.
Check the highway for the
RECEIVER.
Check CHIP SELECTION.
(U1, U2 PIN, U5 PIN45/46)
Replace the corresponding IC.
Test the operation(U1~U3) of each
IC via the program for displaying the
MMC 850 system resource.
Check the ADDRESS/DATA
buffer signal.
Does the RS/CID RECEIVER
operate?
Does the R2 SENDER operate?
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