Download HCD-EH15

HCD-EH15
SECTION 5
MECHANICAL ADJUSTMENTS
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.)
3. Do not use a magnetized screwdriver for the adjustments.
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
Mode
FWD
FWD
Back Tension
FF
Torque meter
CQ-102AS
CQ-102C
CQ-201AS
REW
CQ-201B
Meter reading
2.0 – 8.0 mN • m
(20 – 80 g • cm)
(0.28 – 1.12 oz • inch)
0.15 – 0.6 mN • m
(1.5 – 6.0 g • cm)
(0.021 – 0.083 oz • inch)
5.0 – 17.7 mN • m
(50 – 177 g • cm)
(0.7 – 2.48 oz • inch)
5.0 – 17.7 mN • m
(50 – 177 g • cm)
(0.7 – 2.48 oz • inch)
TAPE TENSION MEASUREMENT
Mode
FWD
Torque meter
Meter reading
CQ-403A
more than 80 g
(more than 2.82 oz)
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION
0 dB=0.775 V
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
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
MAIN board
PHONES jack
(J102)
level meter
set
+
–
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.
within
1dB
L-CH
peak
within
1dB
Output
level
Screw
position
R-CH
peak
L-CH
peak
Screw
position
R-CH
peak
3. Mode: Playback
test tape
MAIN board
P-4-A063
PHONES jack oscilloscope
(6.3 kHz, –10 dB) (J102)
V
set
H
waveform of oscilloscope
in phase 45°
good
90°
135° 180°
wrong
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
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