Teac MV1421, Service Manual

Page: 58 / 130

5 6
10-5. NO SOUND
10-6. NO EXTERNAL AV
CHECK AUDIO SIGNAL
AT PIN 15 OF I501
(TDA8374)
CHECK VOLUME CONTROL
VOLTAGE ?
CHECK SIGNAL AT PIN 1
OF I501
CHECK QC505,Z501,Z502
CHECK SIGNAL AT PIN 55
OF I501.
CHECK VOLTAGE AT PIN
2,3 OF I601
I701 20 PIN = H ?
IN01 56 PIN = H ?
CHECK QCY17,QC601 AND
ADJACENT CIRCUIT
SPEAKER ?
SPEAKER CONNECTOR ?
NG
NG
NG
OK
OK
OK
SCART JACK INPUT
CHECK SIGNAL AT
PIN 23,24,25 OF I501.
RCA JACK INPUT
CHECK SIGNAL AT
PIN 11 OF I501.
CHECK SWITCHING
VOLTAGE ABOUT 2.2V
AT PIN 26 OF I501.
CHECK SCART JACK
AND PATTERN.
CHECK QC511 AND
ADJACENT CIRCUIT.
CHECK I701 AND
ADJACENT CIRCUIT.
CHECK / REPLACE
I501.
CHECK AT PIN 19 OF
I701 = H ?
CHECK SCART JACK
AND PATTERN.
CHECK / REPLACE
I501.
NG
NG
NG OK
OK
OK
OK
OK