Mechanical Adjustments; Electrical Adjustments - Sony HCD-EX6 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

HCD-EX6T/EX8T/EX9T only:
Precaution
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head
erase head
capstan
2. Demagnetize the record/playback head with a head demag-
netizer. (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
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter
FWD CQ-102AS
FWD
CQ-102C
Back tension
FF CQ-201AS
REV CQ-201B
Tape Tension Measurement
Mode Tension meter
FWD CQ-403A
pinch roller
rubber belts
idlers
Meter reading
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)
Meter reading
more than 80 g
(more than 2.82 oz)
HCD-EX6/EX6T/EX8/EX8T/EX9/EX9T
SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION
0 dB = 0.775V
HCD-EX6T/EX8T/EX9T only:
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
TEST TAPE
Tape Signal
P-4-A063 6.3 kHz, –10 dB
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Adjustment Location: Record/Playback Head (See page 16)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode: Playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
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 1 dB of peak.
within
L-CH
1 dB
peak
Output
level
R-CH
peak
Screw
position
L-CH
peak
3. Mode: Playback
test tape USB-JACK board
P-4-A063 PHONES jack
(6.3 kHz, –10 dB) (J551)
set
waveform of oscilloscope
in phase 45º
good
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Used for
Azimuth Adjustment
USB-JACK board
PHONES jack
(J551)
level meter
+
–
within
1 dB
Screw
position
R-CH
peak
oscilloscope
H
V
90º 135º 180º
wrong
15