Sharp PG-C20XU Service Manual page 42

PG-C20XU
PG-C20XE
AN-Z7T
Checking the audio
signal
Are there audio output
signals at pins (7) of
IC3301 and IC3302?
Is voltage applied to pin (4)
of IC1901?
Using the remote control,
change VOL and cancel
MUTE. Does the voltage at
pin (7) of IC1901 vary
accordingly?
Is there audio output signal
at pin (5) of IC1901?
Check the SP connector.
Checking the RS-232C
Using the communication
software ("TERA TERM"
recommended), make the
following settings:
Baud rate: 9600 bps
Bit length: 8 bits
Stop bit: 1 bit
Parity: None
Press the RETURN key on
the keyboard. Does "ERR"
reappear?
YES
End
NO
Check the audio cable.
YES
Switch IC3301 and IC3302
to each other to check the
peripheral circuits.
NO
YES
Check R1914 first and
then the power circuit.
NO
Check IC1403, IC1605 and
YES
their peripheral circuits.
NO
YES
NO
Check IC3601, IC1606,
IC1601, SW1602, IC8022,
communication circuit and
their peripheral circuits.
Check IC1901 and its
peripheral circuits.
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