Sony CMT-EP404 / HCD-EP404 Service Manual ▷ View online
8
HCD-EP404
3-4. POWER Board, Power Transformer
3-5. DISPLAY Board, HEADPHONE Board
8
screw
(+BTP2.6
(+BTP2.6
×
8)
3
screw
(+BVTP3
(+BVTP3
×
10)
1
screw
(+BVTP3
(+BVTP3
×
10)
4
four screws
(+BVTP3
(+BVTP3
×
12)
5
power transformer
q;
POWER board
9
power pwb mounting bkt
2
ac cord holder
6
Remove four solderings.
7
Remove four solderings.
rear cabinet assy
7
screw
(+PTPWH2.6
(+PTPWH2.6
×
10)
qa
HEADPHONE board
9
Remove the soldering.
q;
earth wire
8
reteiner board
6
DISPLAY board
5
main pwb mounting bkt
4
seven screws
(+BTP2.6
(+BTP2.6
×
10)
1
vol. rotaly knob
2
washer
3
nut
9
HCD-EP404
3-6. CD Cabinet Section
3-7. CD Mechanism Deck (CS-21SC-1280)
1
two screws
(+BTP2.6
(+BTP2.6
×
8)
2
CD cabinet section
1
two screws
(BVTP3
(BVTP3
×
8)
4
CD cover housing
qa
vibration proof rubber
(pink)
(pink)
qs
vibration proof rubber
(pink)
(pink)
6
four fiber washers
5
four pulley screws
q;
vibration proof rubber
(orange)
(orange)
qd
vibration proof rubber
(orange)
(orange)
qf
CD mechanism deck (CS-21SC-1280)
7
3
8
two spring clamps
9
two spring clamps
2
Remove the connector.
10
HCD-EP404
3-8. Cassette Lid
3
claw
3
claw
2
5
cassette lid
4
1
Push
open/close switch
11
HCD-EP404
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab :
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2.
Demagnetize the record/playback head with a head
demagnetizer.
demagnetizer.
3.
Do not use a magnetized screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
5.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
Torque Measurement
Tape Tension Measurement
Mode
Torque Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
(more than 3.53 oz)
PRECAUTION
1.
Setting
MEGA BASS switch : OFF
MEGA BASS switch : OFF
TAPE DECK SECTION
0 dB=0.775 V
Test tape
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN•m
FWD
CQ-102C
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
FWD
CQ-102C
(1.5 – 5.5 g•cm)
Back Tension
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
(more than 0.83 oz•inch)
Type
Signal
Used for
P-4-A100
10 kHz, –10 dB
Head Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
Record/Playback Head Azimuth Adjustment
Procedure:
1.
1.
Mode: Playback
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
set
HEADPHONE board
PHONES jack (JK501)
PHONES jack (JK501)
32
Ω
+
–
–
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 1dB of peak.
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3.
Mode: Playback
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
L-CH
R-CH
HEADPHONE board
PHONES jack (JK501)
PHONES jack (JK501)
oscilloscope
V
H
+ +
–
–
screen pattern
in phase
good
wrong
45
°
90
°
135
°
180
°
32
Ω
32
Ω
set
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