Sony DHC-MD777 / HMC-MD777 Service Manual ▷ View online
– 49 –
– 50 –
• Circuit Boards Location
CD DISPLAY board
CONNECTOR board
CD JOG board
MD DISPLAY board
MD SW board
WM board
MD JOG board
RELAY board
MAIN board
MICROCOMPUTER board
CD SW board
SENSOR 2 board
HEAD RELAY board
OUT SW board
DISC SW board
MECH RELAY board
SW board
BD (MD) board
ELEVATOR RELAY board
HEAD SW board
LOAD MOTOR board
CONNECTOR (CD) board
INIT/COUNT SW board
IN SW board
BD (CD) board
CLAMP MOTOR board
SENSOR board
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
C
: panel designation.
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
•
U
: B+ Line.
•
V
: B– Line.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
J
: CD PLAY (ANALOG)
k
: CD PLAY (DIGITAL)
d
: MD PLAY
j
: MD REC (ANALOG IN)
l
: MD REC (OPTICAL IN)
C
B
These are omitted.
E
Q
• Indication of transistor.
B
These are omitted.
C
E
Q
6-5.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
HMC-MD777
– 51 –
– 52 –
6-6.
PRINTED WIRING BOARD – BD (CD) Section –
•
See Page 49 for Circuit Boards Location.
• Semiconductor
Location
(SIDE A)
(SIDE A)
Ref. No.
Location
Q101
C-3
• Semiconductor
Location
(SIDE B)
(SIDE B)
Ref. No.
Location
IC101
C-2
IC102
B-3
IC103
B-3
(Page 72)
HMC-MD777
– 53 –
– 54 –
6-7.
SCHEMATIC DIAGRAM – BD (CD) Section –
•
See page 65 for Waveforms.
•
See page 99 for IC Block Diagrams.
The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
(Page 73)
HMC-MD777
– 55 –
– 56 –
6-8.
PRINTED WIRING BOARDS – CD MOTOR/SENSOR Section –
•
See page 49 for Circuit Boards Location.
(Page 56)
(Page 56)
(Page 55)
(Page 55)
(Page 72)
(Page 72)
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