Mechanical Adjustments; Electrical Adjustments - Sony HCD-CPZ1 Service Manual

SECTION 5
Q Q

MECHANICAL ADJUSTMENTS

3 7 6 3 1 5 1 5 0
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head de-
magnetizer.
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 Meter reading
3.06 N • m to 6.96 N • m
FWD CQ-102C 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
FWD
CQ-102C 2 to 6 g • cm
back tension
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
REV CQ-102RC 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
REV
CQ-102RC 2 to 6 g • cm
back tension
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
T E
L 1 3 9 4 2 2 9 6 5 1 3
FF/REW CQ-201B 71 to 143 g • cm
(0.98 – 1.99 oz • inch)
FWD tension CQ-403A 100 g or more
(3.53 oz or more)
REV tension CQ-403R 100 g or more
(3.53 oz or more)
w w w
HCD-CPZ1
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
P-4-A063 6.3 kHz, -10 dB
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Note: Remove the cover (azimuth) before this adjustment.
9.80 N • m Procedure:
1. Mode: Playback
9.80 N • m
test tape
HP/MD board
P-4-A063
PHONES jack
(6.3 kHz, –10 dB)
(J982)
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
L-CH
1dB
peak
Output
level
x a o
y
R-CH
peak
. i
Screw
position
L-CH
peak
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3. Mode: Playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
Used for
Azimuth Adjustment
in phase 45 °
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
Q Q
3 7 6
forward
level meter
+
–
within
1dB
u 1 6 3
.
Screw
position
R-CH
peak
19 19
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2 4
8 9 9
CD SECTION
HP/MD board
Note:
oscilloscope
PHONES jack
1. CD Block is basically constructed to operate without adjustment.
(J982)
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MW impedance.
V H 4. Clean the object lens by an applicator with neutral detergent when the
set
signal level is low than specified value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
waveform of oscilloscope
90 ° 135 ° 180 °
good wrong
Procedure :
1. Connect oscilloscope to TP (RFACI) and TP (VC) on the BD
board.
2. Press the I/1 button to turn the power ON, and press
the Z (CD) button to open the CD disc tray.
3. Set disc (YEDS-18) on the tray and press the CD u button
to playback.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.
3 1 5 1 5 0 8 9 2
Checking Location:
– BD Board (Conductor Side) –
reverse
TP
(VC)
m
c o
HCD-CPZ1
2
8 9 9
oscilloscope
(DC range)
BD board
TP (RFACI) +
TP (VC)
–
VOLT/DIV: 200 mV
4 9 8 2 9 9
TIME/DIV: 500 ns
level:
0.9 ± 0.4 Vp-p
IC201
TP
(RFACI)