Sony CMT-EP50 / HCD-EP50 Service Manual ▷ View online
HCD-EP50
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-EP50
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-EP50
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-EP50
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Setting:
Function: TAPE
Function: TAPE
Procedure:
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor so that the fre-
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor so that the fre-
quency counter reading becomes 3,000 Hz.
Specified Value: 2,970 to 3,030 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
PRECAUTION
1. Setting
MEGA BASS switch : OFF
TAPE DECK SECTION
0 dB=0.775 V
Test tape
Type
Signal
Used for
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-A100
10 kHz, –10 dB
Head Azimuth Adjustment
frequency counter
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
set
MAIN board
SPEAKER terminal (CN17)
SPEAKER terminal (CN17)
–
+
47 k
Ω
CAPSTAN/REEL
motor
motor
Tape Speed
Adjustment
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)
Click on the first or last page to see other CMT-EP50 / HCD-EP50 service manuals if exist.