Sanyo PDP-42H1A, Service Manual

Page: 21 / 76

-21-
Circuit Block Diagram
■
Audio
Sub CPU
Jack D
PC
Monitor
Out
L
R
AV3
L
R
IC001
Audio Control
Main
L
R
L
R
L
R
L
R
L
R
IC1001 AV
Switch
14(L),16(R)
AV3
2(L),4(R)
AV1
8(L),10(R)
AV2
5(L),14(R)
PC
1(L),12(R)
AV4
3(L),13(R)
59(L),61(R)
PC
IC1002
PC Sound
Switch
52(L),54(R)
L
R
Monitor Out
L
R
SELECTED
23(L),2(R)
IC002
Q Suond
(Suurround)
13(L),11(R)
6(L),2(R)
7(L),1(R)
SURROUND
IC003
AMP
22(L),21(R)
SURROUND
16(L),15(R)
EFFECTED
1(L),24(R)
6(L),19(R)
IC121
BBE
BBE
7(L),1(R)
6(L),2(R)
IC031
Head Phone
AMP
25(L),20(R)
23(L),22(R)
10(L),13(R)
IC071
Digital
Sound AMP
+
-
L
R
L
R
Head Phone
(Main Unit)
Speaker X2
Jack C
AV1
L
R
Jack A
AV2
L
R
AV4
L
R
L
R
Woofer
Out
W
W
IC004
Woofer
AMP
6
7 2 1
Through
Out
Signal Flow
Sound signals (L & R) from AV1, AV2 or AV3 are input to AV SW IC (IC1001) and selected.
Sound signals from AV4 terminal are output for “Through Out” terminal.
Sound signals from D-SUB or AV4 are input to IC1001 after selected by SW IC (IC1002) .
The selected signals by IC1001 are output to Monitor Out and also input to below ICs.
Q-Sound IC (IC002)
➔
AMP IC (IC003)
➔
Audio Control IC (IC001)
➔
BBE IC (IC121)
Finally signals from IC121 are input to Digital AMP IC (IC071) for speakers and AMP IC (IC031) for Head Phone.
Note: Sound signals from IC001 is input Woofer AMP IC (IC004) too.