Sharp PG-M20X Service Manual page 29

Checking of Sub-microprocessor
and Its Periphery
Does POWER LED flicker in red
(for 2 seconds)?
Yes
Is there B+3.3V output at pins (12)
and (13) of CN3701?
No
Is there 6V output at pins (5) and
(6) of P2003?
Yes
Go to "Checking of Power Unit"
No
Go to "Checking of PC I/F Unit", and check
the flexible connector.
Yes
Communication error of sub-microprocessor
(KEY) and SH microprocessor (PC I/F unit)
Pins (20) and (21) of P2001.
No
Check Q2001 thru Q2004 of
IC2001.
Is Bu+6.2V signal outputted?"
Is Bu+3.3V signal outputted?
Is 3.3V signal output at pin
(19) of IC2001?
Check IC2001 and its
periphery and go to
"Checking of Remote Control
Communication".
29
No
Yes
No
Yes
No
Yes
PG-M20X
Go to "Checking of
Power Unit"
Check IC2010 and its
periphery.
Check IC2002 and its
periphery.