Sony HCD-DX90 / MHC-DX90 Service Manual ▷ View online
HCD-DX90
33
33
7-12. SCHEMATIC DIAGRAM – PANEL SECTION – • See page 21 for Wavefoms. • See page 43 for IC Block Diagrams.
MAIN BOARD (3/3)
CN401
0
0
0
0
0
0
7.0
R746
1k
MTZJ-T-77-5.6C
C617
0.001
0.001
220
270
180
7.2
7
0
22K
MIC
LEVEL
10k
100 10V
100 10V
: /1
180
REC PAUSE/START
REC PAUSE/START
V
v
JW
B
b
PLAY MODE
STERO/MONO
REPEAT
DOLBY NR
270k
270k
PHONES
1
7
EDIT
TUNER MEMORY
: /1
33 50V
33
1
7
(Page 29)
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD STOP
no mark : CD STOP
HCD-DX90
34
34
CN303
TAPE MECHANISM
DECK BLOCK (2/3)
(TCM-230PWR11)
TAPE MECHANISM
DECK BLOCK (3/3)
(TCM-230PWR11)
(ERASE HEAD)
(REC/PB HEAD)
CN304
S1001, 1002
S1003 – 1006,
S1008,1009
M
M901
(CAPSTAN)
TAPE MECHANISM
DECK BLOCK (1/3)
(TCM-230PWR11)
PM1001
PLUNGER
(DECK-A)
PM1002
PLUNGER
(DECK-B)
A
B
C
D
1
2
3
4
5
6
CN302
7-13. PRINTED WIRING BOARD – LEAF SW SECTION – • See page 21 for Circuit Boards Location. • See page 28 for Schematic Diagram of Head Board.
• Semiconductor
Location
Ref. No. Location
D1001
B-2
D1002
B-5
IC1001
B-1
IC1002
B-5
Q1001
B-2
(Page 26)
(Page 26)
(Page 26)
HCD-DX90
35
35
7-14. SCHEMATIC DIAGRAM – LEAF SW SECTION –
TAPE SPEED
(NORMAL)
PM1002
(DECK-B)
PM1001
(DECK-A)
TAPE
MECHANISM DECK
BLOCK (1/3)
(TCM-230PWR11)
TAPE SPEED
(HIGH)
(DECK-A)
(DECK-B)
MAIN BOARD (2/3)
CN304
(Page 28)
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : PB (DECK-A)
(
no mark : PB (DECK-A)
(
) : PB (DECK-B)
HCD-DX90
36
36
14
(14)
14
(14)
CN202
14
(14)
A
B
C
D
E
F
1
2
3
4
5
7-15. PRINTED WIRING BOARD – DRIVER SECTION –
• Semiconductor
Location
Ref. No. Location
D701
E-1
IC701
E-1
IC711
B-4
(Page 26)
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