FUNAI F42PDME Service Manual page 34

FLOW CHART NO. 4
Audio is not outputted from audio output terminal normally.
Input audio signal.
Is audio signal inputted to each pins on IC202
and IC203?
[****] is the check point on the componet side.
When inputting to Video 1 jack...
IC203 Pin (13) [J165] AUDIO1(L)
IC202 Pin (13) [J135] AUDIO1(R)
When inputting to Video 2 jack...
IC203 Pin (14) [J166] AUDIO2(L)
IC202 Pin (14) [J129] AUDIO2(R)
When inputting to component 1 jack...
IC203 Pin (15) [CN201 Pin (1)] AUDIO3(L)
IC202 Pin (15) [CN201 Pin (2)] AUDIO3(R)
When inputting to component 2 jack...
IC203 Pin (12) [CN201 Pin (4)] AUDIO4(L)
IC202 Pin (12) [CN201 Pin (5)] AUDIO4(R)
Is input switching signal inputted to each pins on
IC202 and IC203?
[****] is the check point on the componet side.
Pin (9)
[Q205-C]
Video 1
L
Video 2
L
Component 1
L
Component 2
L
Is audio signal outputted to each pins on IC202
and IC203?
[****] is the check point on the componet side.
IC203 Pin (3) [J148] L-CH
IC202 Pin (3) [J142]
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.
Yes
Pin (10) Pin (11)
[Q204-C] [Q203-C]
L L
L H
H L
H H
Yes
R-CH
Yes
Yes
Yes
Check lines between Pin (13) on IC203 and
No
JK702, between Pin (13) on IC202 and JK702,
and service it if defective.
No
Check lines between Pin (14) on IC203 and
JK702, between Pin (14) on IC202 and JK702
and service it if defective.
No
Replace the Digital CBA.
No
Replace the Digital CBA.
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.
No
Pin (9) on IC202,IC203
Pin (10) on IC202,IC203
Pin (11) on IC202,IC203
Check +6.5 V line and service it if defective.
No
Is +6.5V signal inputted to Pin (16) on IC202
No
and Pin (16) on IC203?
Yes
Replace IC202 or IC203.
No
Check Q707, Q708 and the periphery circuit, and
service it if defective.
No
Is the "L" pulse supplied to the base of Q710?
Check Q709 and the periphery
circuit, and service it if
defective.
1-7-4
Pin (30) on IC205
Pin (29) on IC205
Pin (28) on IC205
Yes
Replace IC205.
L0605TR
No