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(2) Locating the deÍective division oÍ DRP, SFG and DAIO communication (Data and Control Line:
..DRP/SFC/ DAIO NG')
"DRP NG", "SFC NG" and "DAIO NG" are all displayed.
Unsolder pins @ to @ of Q501(DRP), pins @ to @ of
Q551 (SFC), and pins @ to @ of QA01 (DAIO) to Íloat them from the circuit.
"NG" appears
w'ni'fË3$':j3#
DAro when
Solder pins @ to @ of Q5o1(DRP).
Select DRP Communication Test mode in Service
mode (see "How To Enter Service Mode" on page 19).
DRP (Q501) or its peripheral
logic is defective.
"DRP NG" displayed?
"DRP OK" displayed?
Solder pins @ to @ of Q551 (SFC).
Select SFC Communication Test mode in Service
mode (see "How To Enter Service Mode" on page 19).
SFC (0551) or its peripheral
logic is defective.
''SFC OK" displayed?
"SFC NG'displayed?
Solder pins @ to @ of QAol (DAIO).
Select DAIO Communication Test mode in Service
mode (see "How To Enter Service Mode" on page 19).
DAIO (OA01) or its peripheral
logic is defective.
"DAIO OK" displayed?
"DAIO NG" displayed?
The data and control lines connecting to DRP (Q501),
SFC (Q551), and DAIO (OA01) are all normal.
YES
YES
YES
YES
Notes:
o lf an lC or its peripheral component is found to be
defective, leave its pin(s) unsoldered or replace if
with a Íunctioning component.
.
If a defective lC or peripheral is left soldered, an
"NG" message will reappear when another lC is
tested.
.
l0s or peripherals found to be normal may be
resoldered.
o More than one lC or peripheral may be defective at
a time. Carry out all the troubleshooting steps even if
a defective IC or component is discovered before
you complete all the steps.
The unit turns off if no button is operated for 3
minutes after entering Service mode.
Use a normal (new) tape for troubleshooting.
To exit Service mode, press the STOP button.
- 27 -
PCS 79 287
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