Sylvania 6842PE M, Service Manual, Page: 30 / 82

1-7-4 L0604TR
No
No
Yes
Yes
Yes
Is audio signal outputted to the collector of Q707
(L-CH) and the collector of Q708 (R-CH)?
Is the "L" pulse supplied to the base of Q711 and
the base of Q712?
Check lines between Q707 and JK703, between
Q708 and JK703 and service it if defective.
Check Q707, Q708 and the periphery circuit, and
service it if defective.
Check Q709 and the periphery
circuit, and service it if
defective.
No Yes
Is the "L" pulse supplied to the base of Q710?
Replace IC205.
Input audio signal.
Is audio signal inputted to each pins on IC202
and IC203?
[****] is the check point on the componet side.
IC203 Pin (13) [J165] AUDIO1(L)
IC202 Pin (13) [J135] AUDIO1(R)
IC203 Pin (14) [J166] AUDIO2(L)
IC202 Pin (14) [J129] AUDIO2(R)
IC203 Pin (15) [CN201 Pin (1)] AUDIO3(L)
IC202 Pin (15) [CN201 Pin (2)] AUDIO3(R)
No
No
No
No
IC203 Pin (12) [CN201 Pin (4)] AUDIO4(L)
IC202 Pin (12) [CN201 Pin (5)] AUDIO4(R)
Check lines between Pin (13) on IC203 and
JK702, between Pin (13) on IC202 and JK702,
and service it if defective.
Check lines between Pin (14) on IC203 and
JK753, between Pin (14) on IC202 and JK754
and service it if defective.
Replace the Digital CBA.
Replace the Digital CBA.
When inputting to Video 1 jack...
When inputting to Video 2 jack...
When inputting to component 1 jack...
When inputting to component 2 jack...
Pin (9) on IC202,IC203 Pin (30) on IC205
Pin (10) on IC202,IC203 Pin (29) on IC205
Pin (11) on IC202,IC203 Pin (28) on IC205
L
L
L
L
Video 1
Video 2
Component 1
Component 2
L
L
H
H
L
H
L
H
IC203 Pin (3) [J148] L-CH
IC202 Pin (3) [J142] R-CH
Is audio signal outputted to each pins on IC202
and IC203?
[****] is the check point on the componet side.
Is +6.5V signal inputted to Pin (16) on IC202
and Pin (16) on IC203?
Is input switching signal inputted to each pins on
IC202 and IC203?
[****] is the check point on the componet side.
No
No
No
Yes
Yes
Check lines between each pins on IC203 and
each pins on IC205, between each pins on IC202
and each pins on IC205 and service it if defective.
Check +6.5 V line and service it if defective.
Replace IC202 or IC203.
Yes
Pin (9)
[Q205-C]
Pin (9)
[Q204-C]
Pin (9)
[Q203-C]
FLOW CHART NO. 4
Audio is not outputted from audio output terminal normally.