Sony HCD-EC50 Service Manual ▷ View online
9
HCD-EC50
3-6.
JACK BOARD
1
two screws
(BVTP2.6
×
8)
3
JACK board
2
JACK HOLD board
3-7.
MAIN BOARD
4
two screws
(BV3
×
10)
5
screw
(BV3
×
10)
3
screw
(BV3
×
10)
6
MAIN board
2
wire (flat type)
27core (CNS111)
1
wire (flat type)
23core (CNS104)
10
HCD-EC50
3-8.
CD SECTION AND BASE UNIT (BU-K6BD83S-WOD) SECTION
2
four screws
(BV3
×
10)
7
CD section and base unit
(BU-K6BD83S-WOD) section
6
tray panel
4
wire (flat type)
23core
5
wire (flat type)
13core
3
Remove the CD section and base unit
(BU-K6BD83S-WOD) section in the
direction of the arrow.
direction of the arrow.
1
wire (flat type)
23core (CNS104)
11
HCD-EC50
3-9.
CHASSIS (MAIN MOLD)
1
eight screws
(BV3
×
10)
2
rear cabint
4
six screws
(BVTP4
×
12)
3
Remove soldering from
the two points
8
chassis (main mold)
6
HOLD board
5
screw
(BV3
×
10)
7
AC cord
3-10. PT BOARD AND POWER TRANSFORMER
1
four screws
(BV4
×
8)
2
PT board,
power transformer
12
HCD-EC50
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
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
4. After the adjustments, apply suitable locking compound to
the pats 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
0 dB=0.775 V
DECK SECTION
set
JACK board
PHONES jack
(J102)
PHONES jack
(J102)
+
–
–
level meter
test tape
P-4-A063
(6.3 kHz,
P-4-A063
(6.3 kHz,
−
10 dB)
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
•
Test Tape
Tape
Signal
Used for
P-4-A063
6.3 kHz, -10 dB
Azimuth Adjustment
set
test tape
P-4-A063
(6.3 kHz,
P-4-A063
(6.3 kHz,
−
10 dB)
oscilloscope
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
JACK board
PHONES jack
(J102)
PHONES jack
(J102)
•
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
demagnetizer. (Do not bring the head magnetizer close to the
erase head.)
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, appiy suitable locking compound to
4. After the adjustments, appiy suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
•
Torque Measurement
•
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 80 g
(more than 2.82 oz)
2.0 – 8.0 mN • m
(20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
0.15 – 0.6 mN • m
(1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
CQ-102AS
CQ-102C
CQ-201AS
CQ-201B
Mode
FWD
FWD
back tension
FF
REW
Torque meter
Meter reading
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
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