Sony HCD-G2500 / HCD-XB20 / HCD-XB22 / LBT-G2500 / LBT-XB20 / LBT-XB22 Service Manual ▷ View online
— 9 —
2-7. CASSETTE DOOR
2-8. CD DOOR ASSY
3
Door spring
1
Cassette door (R)
3
Door spring
2
Cassette door (L)
8
CD door assy
1
Three screws
6
Four screws
7
Connector
4
Screw
2
PLAY SW board
3
Three flat wires
5
DOOR SW board
— 10 —
2-9. BASE UNIT
2-10. DISC TABLE
Note:
When the disc table is installed, adjust the positions
of roller cam and mark z as shown in the figure,
then set to the groove of disc table.
of roller cam and mark z as shown in the figure,
then set to the groove of disc table.
1
Screw
(BVTP 3
×
8)
1
Screw
(BVTP 3
×
8)
4
Disc table
3
Step screw
2
Bracket (BU)
A
A
3
Base unit
1
Yoke bracket
2
Boss
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Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback head
record/playback head
pinch rollers
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
SECTION 3
MECHANICAL ADJUSTMENTS
Meter reading
40 to 70 g • cm
(0.56 - 0.97 oz • inch)
1 to 5 g • cm
(0.01 - 0.07 oz • inch)
55 to 140 g • cm
(0.76 - 1.94 oz • inch)
Torque
FWD
FWD
back tension
FF/REW
Torque meter
CQ-102C
CQ-102C
CQ-201B
SECTION 4
ELECTRICAL ADJUSTMENTS
1.
Demagnetize the record/playback head with a head
damagnetizer.
damagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
5.
The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6.
The adjustments should be performed for both L-CH and R-
CH.
CH.
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1.
1.
Mode : Playback
DECK SECTION
0 dB=0.775V
Tape
P-4-A100
WS-48B
Signal
10 kHz, –10 dB
3 kHz, 0 dB
Used for
Azimuth Adjustment
Tape Speed Adjustment
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
SPEAKER
terminal (JK703)
terminal (JK703)
level meter
+
–
set
— 12 —
2.
Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.
3.
Mode: Playback
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
Adjustment Location:
Remove the cassette lid before adjustment (See page 9)
Remove the cassette lid before adjustment (See page 9)
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
Tape Speed Adjustment (Deck A)
Procedure:
1.
1.
Mode: Playback
2.
Adjust the SFR809 so that the frequency counter reads 3,000
Hz ± 90Hz.
Hz ± 90Hz.
Adjustment Location: MAIN board (See page 14)
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
2dB
2dB
within 2dB
L-CH
peak
peak
screw
position
position
R-CH
peak
peak
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
SPEAKER
terminal (JK703)
(L-CH)
terminal (JK703)
(L-CH)
set
L
R
SPEAKER
terminal (JK703)
(R-CH)
terminal (JK703)
(R-CH)
Waveform of oscilloscope
in phase
45˚
90˚
135˚
180˚
good
wrong
SPEAKER
terminal (JK703)
terminal (JK703)
set
frequency counter
+
–
–
Adjustment screws
REC/PB head (deck A)
or PB head (deck B)
REC/PB head (deck A)
or PB head (deck B)
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