Sony CMT-DC500MD / HCD-J300 Service Manual ▷ View online
5
HCD-J300
DRAWING OUT THE TRAY DURING POWER OUT
CLEANING THE OPTICAL PICK-UP (CD PLAYER)
Tray
Move the cam block in the direction of the arrow by fingers.
1
Floating screw
3
BU-K4BD43
2
CD mechanism deck
4
Rotate it in the
direction of the arrow
A
.
A
B
5
Move it in the
direction of the arrow
B
.
6
Clean the lens block
by cotton swab
Optical pick-up
6
HCD-J300
SERVICE POSITION OF THE MD MECHANISM
SERVICE POSITION OF THE CD MECHANISM
MD mechanism deck
(MDM-7B)
(MDM-7B)
Digital board
Main board
BD board
CN304
CN301
CN801
CN1001
CD mechanism deck
(CDM55F-K4BD43)
(CDM55F-K4BD43)
Loading board
Main board
CD board
CN1
CN308
CN101
CN302
7
HCD-J300
SERVICE POSITION OF THE CASSETTE
MECHANISM DECK
MECHANISM DECK
Tape mechanism deck
Main board
CN301
CN303
8
HCD-J300
JIG FOR CHECKING BD (MD) BOARD WAVEFORM
The special jig (J-2501-196-A) is useful for checking the waveform of the BD (MD) board. The names of terminals and the checking items
to be performed are shown as follows.
to be performed are shown as follows.
GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP
: For measuring IOP (Check the deterioration of the optical pick-up laser)
TE
: TRK error signal (Traverse adjustment)
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
FE
: Focus error signal
I+3V
CN105
IOP
TE
VC
GND
FE
RF
I+3V
Iop
Iop
GND
TE
FE
VC
RF
FE
VC
RF
I+3V
IOP
GND
TE
FE
FE
VC
RF
1
7
for
MDM-7B
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