Sony HCD-VX550 / MHC-VX550 Service Manual ▷ View online
HCD-VX550
33
33
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : TAPE PLAY
(
no mark : TAPE PLAY
(
) : RECORD
PB LEVEL (L)
(DECK A)
PB LEVEL (R)
(DECK A)
PB LEVEL (L)
(DECK B)
PB LEVEL (R)
(DECK B)
PB EQ AMP
(DECK A)
PB EQ AMP
(DECK B)
SWITCHING
REC BIAS (L)
(DECK B)
REC BIAS (R)
(DECK B)
BIAS OSC
REC BIAS
-6.8
(PLAYBACK)
D
16
(Page 38)
7-11.
SCHEMATIC DIAGRAM AUDIO BOARD
• Refer to page 48 for IC Block Diagram.
The components identified by
mark
mark
!
or dotted line with mark
!
are critical for safety.
Replace only with part number
specified.
specified.
HCD-VX550
34
34
DECK B
PLUNGER
DECK A
PLUNGER
(CAPSTAN)
(DECK A 120/70)
(DECK A HALF)
(DECK A REC)
(DECK B HALF)
(DECK B REC)
(DECK B 120/70)
ROTATION DETECT SENSOR
(DECK A)
ROTATION DETECT
SENSOR (DECK B)
(DECK A PLAY)
(DECK B PLAY)
E
CONTROL SWITCH
(Page 38)
16
7-12.
PRINTED WIRING BOARD LEAF SW BOARD
• Refer to page 23 for Circuit Boards Location.
7-13.
SCHEMATIC DIAGRAM LEAF SW BOARD
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : TAPE PLAY
(
no mark : TAPE PLAY
(
) : RECORD
∗
: Impossible to measure
Ref. No.
Location
Ref. No.
Location
• Semiconductor Location
D141
E-10
D191
D-12
D331
E-1
D333
F-1
D334
E-1
D335
F-1
D401
G-11
D403
F-12
D405
H-6
D406
I-4
D407
I-2
D411
G-1
D501
D-7
D502
E-6
D503
D-6
D504
D-7
D505
D-7
D506
D-7
D507
E-6
D509
F-2
D607
E-5
D644
C-8
D801
I-11
D802
G-9
D803
G-11
D831
I-6
D832
I-7
D851
I-10
D852
G-9
D881
H-9
D901
I-4
D902
I-4
D903
I-4
D904
I-4
D905
I-1
D906
H-1
D907
I-5
D908
I-5
D909
I-5
D910
I-5
D915
I-4
D917
F-4
D919
H-3
D921
H-4
D922
G-4
D923
G-4
D924
F-2
IC101
C-10
IC301
B-3
IC381
A-12
IC501
D-5
IC502
D-7
IC801
H-10
IC901
G-6
IC902
G-4
IC903
H-4
IC904
H-3
Q111
D-10
Q112
D-10
Q113
E-9
Q161
C-9
Q162
C-9
Q163
E-9
Q191
D-12
Q192
E-10
Q201
D-9
Q251
C-9
Q331
C-1
Q332
C-2
Q333
C-2
Q334
C-2
Q335
D-1
Q336
F-1
Q337
F-1
Q338
F-1
Q339
F-1
Q340
E-1
Q341
E-1
Q342
F-1
Q343
E-1
Q401
F-12
Q402
E-12
Q411
G-1
Q412
G-1
Q431
G-12
Q432
G-11
Q433
F-11
Q434
F-11
Q435
F-11
Q436
F-11
Q437
G-12
Q439
F-12
Q471
F-2
Q501
D-7
Q508
D-7
Q509
E-7
Q801
H-10
Q803
G-10
Q804
G-9
Q831
G-10
Q832
G-10
Q851
I-10
Q881
I-9
Q901
H-2
Q902
I-1
Q903
H-1
Q904
G-4
Q905
G-4
Q909
I-4
Q911
G-3
Q912
G-4
Q913
H-1
Q914
G-2
Q923
H-1
Q951
G-2
Q952
H-1
16
DECK A
PLUNGER
DECK B
PLUNGER
(DECK A PLAY)
(DECK A HALF)
(DECK A 120/70)
(DECK A REC)
(DECK B HALF)
(DECK B PLAY)
(DECK B 120/70)
(DECK B REC)
12
12
E
4
1
2
3
4
1
2
3
(
)
(Page 35)
HCD-VX550
35
35
7-14.
PRINTED WIRING BOARD MAIN BOARD
• Refer to page 23 for Circuit Boards Location.
25
1
4
2
3
L
16
(Page 43)
(Page 42)
(Page 43)
(Page 40)
(Page 34)
(Page 32)
(Page 30)
(Page 30)
(Page 28)
(Page 44)
HCD-VX550
36
36
7-15.
SCHEMATIC DIAGRAM MAIN (1/4) BOARD
• Refer to page 35 for Printed Wiring Board.
(Page 38)
16
(Page 39)
(Page 37)
(Page 44)
(Page 26)
(Page 31)
(Page 31)
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : TUNER (FM/AM)
(
no mark : TUNER (FM/AM)
(
) : CD PLAY
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