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"NG" appears with all of "DRP", "SFC"and DAIO when
the unit enters Service mode.
Solder pins @ to © of Q501(DRP).
Select DRP Communication Test mode in Service
mode (see "How To Enter Service Mode" on page 19).
YES
Solder pins @ to ® of Q551(SFC).
Select SFC Communication Test mode in Service
mode (see "How To Enter Service Mode" on page 19).
YES | SFC (Q551) or itsperipheral
"
a
"
mags
periphera
SFC OK" displayed?
SFC NG" displayed?
logic is defective.
YES
Solder pins @ to ® of QA01(DAIO).
Select DAIO Communication Test mode in Service
mode (see "How To Enter Service Mode" on page 19).
YES | DAIO (QA01)
or itsp eripheral
"
«A
9
"
0
9
p
eriphera
DAIO OK" displayed?
DAIO NG" displayed?
logic is defecive.
YES
DRP (Q501) or its peripheral
logic is defective.
The data and control lines connecting to DRP (Q501),
SFC (Q551), and DAIO (QA01) are all normal.
Notes:
*
ICs or peripherals found to be normal may be
resoldered.
2275
PCS 79 287
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