Sony HCD-CP2A Service Manual ▷ View online
9
CAM (CDM55)
2
lever (SW)
1
torsion spring
6
gear (B)
3
spacer (55)
4
pulley (LDG)
5
gear (A)
7
roller
8
cam (CDM55)
10
[MC Cold Reset]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
the set to the customer.
Procedure:
1. While pressing the
1. While pressing the
I
/1
and
x
(TAPE A) button, connect the
power cord.
2. The set is reset.
[Liquid Crystal Display All Lit Check Mode]
Procedure:
1. Set to standby state.
2. Press three buttons of
1. Set to standby state.
2. Press three buttons of
x
(TAPE B),
x
(CD), and
[VIDEO]
(function) simultaneously.
3. Liquid crystal display are all turned on.
4. To release from this mode, press the
4. To release from this mode, press the
I
/1
button to turn the
power OFF.
[ROM Version Display Mode]
Procedure:
1. Set to standby state.
2. Press three buttons of
1. Set to standby state.
2. Press three buttons of
x
(TAPE B),
x
(CD), and
[DSG]
si-
multaneously.
3. The ROM version is displayed.
[CD Aging Mode]
This mode can be used for operation check of CD section.
Procedure:
1. Load a CD disc.
2. Set to standby state.
3. Press three buttons of
1. Load a CD disc.
2. Set to standby state.
3. Press three buttons of
x
(TAPE B),
x
(CD), and
[TUNER]
(function) simultaneously.
4. The aging is executed in bellow sequence.
5. To release from the aging mode, press the
5. To release from the aging mode, press the
I
/1
button to turn
the power OFF.
Aging mode sequence:
SECTION 4
TEST MODE
Start
REC pause for 3 seconds
FWD REC
REV play for 1 minute
FWD Play
Shut off
Shut off
1 minute
3 minutes
Rewind for 10 seconds
REV play for 3 minutes
FWD play for 2 minutes *1
REC pause for 3 seconds
REV REC for 3 minutes
Fast forward for
20 seconds or till shut off
Fast forward for
20 seconds or till shut off
Rewind for 30 seconds
or till shut off
TAPE A
TAPE B
*1) When it shuts off within 2 minutes, it
REV plays rest of the time then goes
to the next step.
to the next step.
[Tape Deck Aging Mode]
This mode can be used for operation check of tape deck section.
Procedure:
1. Set tapes in the tape deck-A and B.
2. Set to standby state.
3. Press three buttons of
1. Set tapes in the tape deck-A and B.
2. Set to standby state.
3. Press three buttons of
x
(TAPE B),
x
(CD), and
[TAPE]
(function) simultaneously.
4. The aging is executed in bellow sequence.
5. To release from the aging mode, press the
5. To release from the aging mode, press the
I
/1
button to turn
the power OFF.
Aging mode sequence:
Start
Open the disc tray
Close the disc tray
Play the last track
11
0 dB=0.775 V
TAPE DECK SECTION
SECTION 6
ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head)
head)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
3. After the adjustments, apply suitable locking compound to
the parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment)
justment should be completed before performing recording
circuit adjustment)
6. The adjustments should be performed for both L-CH and R-
ch.
7. Switches and controls should be set as follows unless other-
wise specified.
• Test Tape
Record/ Playback Head Azimuth Adjustment
DECK A
DECK B
Note:
Perform this adjustments for both decks
Procedure:
set
MAIN board
IC306
Pin r; (L-CH)
Pin 3 (R-CH)
IC306
Pin r; (L-CH)
Pin 3 (R-CH)
MAIN board
IC306
Pin rl
IC306
Pin rl
+
–
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Check
P-4-L300
315 Hz, 0 dB
Level Adjustment
Mode
Torque Meter
Meter Reading
3.53 ~ 5.98 mN•m
Forward
CQ-102C
36 to 61 g•cm
(0.50 – 0.84 oz•inch)
Forward
0.20 ~ 0.58 mN•m
Back Tension
CQ-102C
2 to 6 g•cm
(0.026 – 0.082 oz•inch)
3.53 ~ 5.98 mN•m
Reverse
CQ-102RC
36 to 61 g•cm
(0.50 – 0.84 oz•inch)
Reverse
0.20 ~ 0.58 mN•m
Back Tension
CQ-102RC
2 to 6 g•cm
(0.026 – 0.082 oz•inch)
5.99 ~ 14.02 mN•m
FF, REW
CQ-201B
61 to 143 g•cm
(0.85 – 1.98 oz•inch)
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 demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to
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
• Tape Tension Measurement
• Tape Tension Measurement
• Torque Measurement
• Tape Tension Measurement
Mode
Tension Meter
Meter Reading
Forward
CQ-403A
more than 9.8 N
more than 100 g (3.52 oz)
Reverse
CQ-403R
more than 9.8 N
more than 100 g (3.52 oz)
SECTION 5
MECHANICAL ADJUSTMENTS
12
Tape Speed Check
Procedure:
Mode: Playback (FWD)
Mode: Playback (FWD)
1. Insert the WS-48B into the deck A and the blank tape into the
deck B.
2. Press the
[HI-SPEED DUBBING]
button and
X
button.
Then at HIGH speed dubbing.
3. Check that frequency counter reads 6,000 ± 180 Hz.
4. Press the
4. Press the
x
(TAPE A or B) button to stop the HIGH speed
dubbing.
5. Press the
[REC ]
,
X
and
Y
button.
Then at NORMAL speed dubbing.
6. Check that frequency counter reads 3,000 ± 90 Hz.
7. Press the
7. Press the
x
(TAPE A or B) button to stop the NORMAL speed
dubbing.
8. Frequency difference between deck A and deck B the begin-
ning of the tape should be within ± 1.5%.
Checking Location: MAIN board
Sample Value of Wow and flutter: 0.3% or less W. RMS (JIS)
(WS-48B)
Playback level Adjustment
Procedure:
Mode: Playback (FWD)
Mode: Playback (FWD)
Deck A is RV401 (L-CH) and RV421 (R-CH), Deck B is RV402
(L-CH) and RV422 (R-CH) on the TC board so that adjustment
within adjustment level as follows.
Adjustment Level:
(L-CH) and RV422 (R-CH) on the TC board so that adjustment
within adjustment level as follows.
Adjustment Level:
IC306 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level
difference between the channels: within ± 0.5 dB
difference between the channels: within ± 0.5 dB
Adjustment Location: TC and MAIN boards
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
MAIN board
IC306(Pin r; : L-CH)
IC306(Pin r; : L-CH)
(Pin 3 : R-CH)
frequency counter
+
–
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
P-4-L300
(315 Hz, 0 dB)
MAIN board
IC306 (Pin r; : L-CH)
IC306 (Pin r; : L-CH)
(Pin 3 : R-CH)
level meter
1. Mode: Playback (FWD)
2. Turn the adjustment screw and check output peaks. If the peaks
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 (FWD)
4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback Head (Deck A and B)
and MAIN board.
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
MAIN
board
IC401
set
board
IC401
set
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
pin 3
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
pin rl
pin r;
L
R
reverse
forward
DECK A
DECK B
z
DECK A
DECK B
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