Sony CMT-EP50LIV / HCD-EP50LIV Service Manual ▷ View online
HCD-EP50LIV
8
3-3.
MAIN BOARD
Note:
Follow the disassembly procedure in the numerical order given.
3-2.
FRONT PANEL SECTION
6
connector
(CN3)
(CN3)
3
two screws
(K3
(K3
×
5)
1
two screws
(BTP2.6
(BTP2.6
×
10)
2
two screws
(BVTP3
(BVTP3
×
10)
3
two screws
(K3
(K3
×
5)
3
two screws
(K3
(K3
×
5)
7
connector
(CN601)
(CN601)
8
connector
(SW300)
(SW300)
9
front panel section
5
4
claw
6
connector
(CN14)
(CN14)
6
connector
(CN15)
(CN15)
5
connector
(CN5)
(CN5)
4
connector
(CN201)
(CN201)
3
connector
(CN7)
(CN7)
2
connector
(CN11)
(CN11)
1
connector
(CN9)
(CN9)
1
connector
(CN4)
(CN4)
9
main board
7
screw
(BTP2.6
(BTP2.6
×
8)
8
HCD-EP50LIV
9
3-4.
CD CABINET SECTION
3-5.
CD MECHANISM DECK (CS-21SC-1280)
1
two screws
(BTP2.6
(BTP2.6
×
8)
2
CD cabinet section
1
two screws
(BVTP3
(BVTP3
×
10)
2
plastic cover
7
vibration proof rubber
(pink)
(pink)
7
vibration proof rubber
(pink)
(pink)
4
four fiber washers
3
four pulley screws
7
vibration proof rubber
(ORG)
(ORG)
7
vibration proof rubber
(ORG)
(ORG)
8
CD mechanism deck (CS-21SC-1280)
5
6
two spring clamps
6
two spring clamps
HCD-EP50LIV
10
3-6.
TAPE MECHANISM DECK (CRL3439)
3-7.
CASSETTE LID
1
two screws
(BVTP3
(BVTP3
×
10)
1
two screws
(BVTP3
(BVTP3
×
10)
2
tape mechanism deck
(CRL3439)
(CRL3439)
1
Open the cassette lid.
3
cassette lid
2
claw
2
claw
11
HCD-EP50LIV
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Setting
MEGA BASS switch : OFF
TAPE DECK SECTION
0 dB=0.775 V
Test tape
Type
Signal
Used for
P-4-A100
10 kHz, –10 dB
Head Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
• Tape Tension Measurement
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
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
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN•m
FWD
CQ-102C
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 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 5.89 mN•m
REW
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
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.
so that outputs match within 1dB of peak.
3. Mode: Playback (FWD)
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
5. After the adjustments, apply suitable locking compound to the
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
MAIN board
SPEAKER terminal (CN17)
SPEAKER terminal (CN17)
oscilloscope
V
H
+ +
–
–
screen pattern
in phase
good
wrong
45
°
90
°
135
°
180
°
47 k
Ω
47 k
Ω
set
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback (FWD)
1. Mode: Playback (FWD)
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
set
MAIN board
SPEAKER terminal (CN17)
SPEAKER terminal (CN17)
47 k
Ω
+
–
–
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