Sony HCD-GRX50 / HCD-R770 / HCD-RXD7 / MHC-GRX50 / MHC-R770 / MHC-RXD7 Service Manual ▷ View online
HCD-GRX50/R770/RXD7
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
– 39 –
– 40 –
7-11.
SCHEMATIC DIAGRAM – AUDIO Board –
•
See page 66 for IC Block Diagram.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : TAPE PLAY
(
no mark : TAPE PLAY
(
) : RECORD
The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque
!
sont
critiques pour la sécurité.
Ne les remplacer que
par une piéce portant le numéro spécifié.
(Page 49)
HCD-GRX50/R770/RXD7
05
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)
21
21
E
4
1
2
3
4
1
2
3
(
)
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
– 41 –
– 42 –
7-12.
PRINTED WIRING BOARD – LEAF SW Board –
•
See page 28 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
Q113
E-9
Q161
C-9
Q162
C-9
Q163
E-9
Q191
E-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-2
Q412
G-3
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
J-10
Q881
I-9
Q901
H-2
Q902
I-1
Q903
H-1
Q904
G-4
Q905
G-4
Q907
G-5
Q908
G-4
Q909
I-4
Q913
H-1
Q914
G-2
Q923
H-1
Q951
G-2
Q952
H-1
Ref. No.
Location
Ref. No.
Location
D141
E-10
D191
E-12
D331
E-1
D333
F-1
D334
E-1
D335
F-1
D401
G-11
D403
F-12
D405
H-6
D406
J-4
D407
I-2
D411
G-3
D501
D-7
D502
E-6
D503
D-6
D504
D-7
D505
D-7
D506
D-7
D509
F-2
D607
E-5
D644
C-8
D801
J-11
D802
G-9
D803
G-11
D831
I-6
D832
J-7
D851
J-10
D852
G-9
D881
H-9
D901
J-4
D902
J-4
D903
J-4
D904
I-4
D905
I-1
D906
H-1
D907
J-5
D908
I-5
D909
J-5
D910
J-5
D915
I-4
D921
H-4
D922
G-4
D923
G-4
D924
F-2
D925
G-4
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
Q111
D-10
Q112
D-10
• Semiconductor Location
(Page 49)
(Page 43)
HCD-GRX50/R770/RXD7
GRX50 : E3, EA3, SP, TW/
R770/RXD7 : CND
R770/RXD7 : CND
(GRX50 : E3, EA3, SP, TW/R770/RXD7 : CND)
– 43 –
– 44 –
7-14.
PRINTED WIRING BOARD – MAIN Board –
•
See page 28 for Circuit Boards Location.
(Page 33)
(Page 33)
(Page 30)
(Page 38)
(Page 41)
(Page 53)
(Page 61)
(Page 61)
HCD-GRX50/R770/RXD7
– 45 –
– 46 –
7-15.
SCHEMATIC DIAGRAM – MAIN Board (1/4) –
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM/AM)
(
no mark : TUNER (FM/AM)
(
) : CD PLAY
(Page 47)
(Page 36)
(Page 36)
(Page 31)
(Page 50)
(Page 51)
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