Panasonic PT-VZ570 Service Manual page 37

SECTION 1 SERVICE INFORMATION
■ SERIAL IN does not respond
Check the cable connection of K20A (SERIAL IN)
A
The signal waveform can be detected at pins 10, 12 of IC3801
A
when the serial command is transmitted.
The signal waveform can be detected at pins 5, 6 of KA1 when
A
the serial command is transmitted.
Replace [A]-P.C.Board
A
■ Controls does not respond
Check the voltage (DC 3.3V) at pin 13 of connector [S1] when the
A
power is turned on.
A Check the connection cable between [A32] - [S1]
A Check the voltage [DC 3V] at pins 9 - 12 of connector [S1]
Check that the voltage changes at L1177 - L1180 when some of
A
the control button are pressed
Replace [A]-P.C.Board
A
OK
OK
OK
OK
OK
OK
OK
NG
A Connect the connector securely
NG
A Check IC3801 and peripheral circuits
NG
J Replace [J]-P.C.Board
NG
A Check the [3.3V] power line on the [A]-P.C.Board
NG
Replace the cable
NG
S Check the [3.3V] power line on the [S]-P.C.Board
NG
Replace [S]-P.C.Board
S
INF-31