Sony CMT-CP500MD / HCD-CP500MD Service Manual ▷ View online
26
HCD-CP500MD
Precaution
1.
Clean the following parts with a denatured alcohol-moistened
swab:
swab:
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
2.
Demagnetize the record/playback head with a head
demagnetizer.
demagnetizer.
3.
Do not use a magnetized screwdriver for the adjustments.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
Torque Measurement
Note:
Standard Volume Point is +10 dBs at SPEAKER Output Level (6
Ω
load resistance) during playbacking P-4-L300 Test Tape.
(DSG OFF, TREBLE/BASS CENTER)
(DSG OFF, TREBLE/BASS CENTER)
Record/Playback Head Azimuth Adjustment
Procedure:
1.
1.
Mode : Playback
Tape
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
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.
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
1 dB
1 dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
within 1dB
3.04 – 6.96 N • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 N • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
3.04 – 6.96 N • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 N • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
6.97 – 14.02 N • m
(71 to 143 g • cm)
(0.98 – 1.99 oz • inch)
0.98 N • m or more
(100 g or more)
(3.53 oz or more)
0.98 N • m or more
(100 g or more)
(3.53 oz or more)
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Mode
FWD
FWD
back tension
back tension
REV
REV
back tension
back tension
FF/REW
FWD tension
REV tension
Torque meter
Meter reading
Signal
Used for
DECK SECTION
0 dB=0.775V
1.
Demagnetize the record/playback head with a head demagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
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 adjustment
should be completed before performing recording circuit
adjustment.)
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6.
The adjustments should be performed for both L-CH and R-
CH.
CH.
7.
Switches and controls should be set as follows unless otherwise
specified.
specified.
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
SJ301
SPEAKER
Output Terminal
SPEAKER
Output Terminal
level meter
set
+
–
6
Ω
27
HCD-CP500MD
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
Adjustment Location:
3.
Mode: Playback
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
oscilloscope
set
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
GND
R-ch
L
R
SJ301
SPEAKER
Output Terminal
SPEAKER
Output Terminal
6
Ω
6
Ω
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.35%
(test tape: WS-48B)
(test tape: WS-48B)
Record Level Check
Procedure:
1.
Press FUNCTION button to select ANALOG IN. (This step
is not necessary if the above test mode has already been set.)
is not necessary if the above test mode has already been set.)
2.
Insert a tape into deck, press the z REC (TAPE) button, and
then press the X (TAPE) button to start recording.
then press the X (TAPE) button to start recording.
3.
Mode: Record
Tape Speed Check
Procedure:
1.
MODE : Playback.
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
SJ301
SPEAKER
Output Terminal
SPEAKER
Output Terminal
frequency
counter
counter
set
6
Ω
2.
Insert the WS-48B into deck.
3.
Press the Y button of deck.
4.
Check the reading of frequency counter becomes 3000
±
90
Hz.
(Top view)
Adjustment point
4.
Mode: Playback
5.
The playback output level should be –4.5
±
3 dB (60 Hz),
1
±
3 dB (8 kHz) and –3
±
3 dB (10 kHz).
AF OSC
ANALOG IN
1) 60 Hz
2) 5 kHz
3) 10 kHz
1) 60 Hz
2) 5 kHz
3) 10 kHz
blank tape
CS-123
CS-123
set
attenuator
600
Ω
109 mV (–17 dB)
recorded
position
position
level meter
set
6
Ω
SJ301
SPEAKER
SPEAKER
28
HCD-CP500MD
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
following checks.
RF Level Check
Procedure :
1. Connect oscilloscope to TP (RFAC) and TP (DVC 1.65V).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RF signal
1. Connect oscilloscope to TP (RFAC) and TP (DVC 1.65V).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure:
1.
1.
Connect oscilloscope to TP (TE) and TP (DVC 1.65V).
2.
Turned Power switch on.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the u button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
waveform.
Specification level:
x
100=less than
±
22%
TP(RFAC)
TP(DVC 1.65V)
TP(DVC 1.65V)
CD BOARD
oscilloscope
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.1
±
0.3Vp-p
CD BOARD
Oscilloscope
TP (TE)
TP (DVC 1.65V)
TP (DVC 1.65V)
0V
Center of
waveform
waveform
B
Symmetry
A (DC voltage)
level=1.3
±
0.6Vp-p
A
B
RF PLL Free-run Frequency
Procedure :
1.
1.
Connect frequency counter to TP (XPCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
Confirm that reading on frequency counter is 4.3218MHz.
Test Point Location :
[CD BOARD] — SIDE B —
+
–
–
frequency counter
CD BOARD
TP (XPCK)
TP
(DVC 1.65V)
(DVC 1.65V)
TP
(TE)
(TE)
IC101
IC103
TP
(XPCK)
(XPCK)
TP
(RFAC)
(RFAC)
29
HCD-CP500MD
Other faults are suspected.
Check the mechanism parts (spindle motor, sled motor, etc.).
Check the mechanism parts (spindle motor, sled motor, etc.).
Start
NG
NG
NG
OK
OK
OK
Laser Power Check
6-2.
(See page 31)
6-3.
(See page 31)
6-4.
(See page 32)
Iop Compare
Auto Check
Replace optical pick-up or MDM-7B
MD SECTION
Note 1:
About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-SCP500/provided with unit: 1-476-754-11)
buttons. These operations are indicated as “R” in this manual.
Example:
As this unit has only a few buttons, some operations require the use of remote commander (RM-SCP500/provided with unit: 1-476-754-11)
buttons. These operations are indicated as “R” in this manual.
Example:
MENU/NO “R”
...Press the
[MENU/NO]
button of the remote commander.
Note 2:
Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the
In this case, press the
?/1
button to turn the power off, and retry to enter the MD test mode.
1. PARTS REPLACEMENT AND ADJUSTMENT
If malfunctions caused by optical pick-up such as sound skipping are suspected, follow the following check.
Check before replacement
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