Sony CHC-TB10 / CHC-TB20 / HCD-TB20 Service Manual ▷ View online
21
HCD-TB20
3-20. Motor Assy (M721), MOTOR Bard
4
two screws (+BTTP M2.6)
2
connector (CN702)
7
motor assy (M721)
5
MOTOR board
6
1
belt
3
Remove two solders.
MOTOR board bottom view
22
HCD-TB20
SECTION 4
TEST MODE
[CD Ship Mode]
• This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
after repair.
Procedure:
1. Press ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press CD 1 button and FUNCTION button simultaneously.
4. After the “STANDBY” display blinks six times, a message
1. Press ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press CD 1 button and FUNCTION button simultaneously.
4. After the “STANDBY” display blinks six times, a message
“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.
ship mode is set.
[GC Test Mode]
• This mode is used to check the software version, LCD, LED
and keyboard.
Procedure:
1. Press ?/1 button to turn the set on.
2. Press three buttons x , ENTER , and CD 2 simultaneously.
3. LEDs and segments of liquid crystal display are all turned on.
4. When you want to enter the software version display mode,
1. Press ?/1 button to turn the set on.
2. Press three buttons x , ENTER , and CD 2 simultaneously.
3. LEDs and segments of liquid crystal display are all turned on.
4. When you want to enter the software version display mode,
press CD 1 . The model number and destination are displayed.
5. Each time CD 1 is pressed, the display changes starting from
MC version, GC version, CD version, CDD version, CDMA
version, CDMB version, BDA version, BDB version, ST version,
TA version, TM version, TC version and MD version in this
order. By pressing CD3 the date of the software version is
displayed.
version, CDMB version, BDA version, BDB version, ST version,
TA version, TM version, TC version and MD version in this
order. By pressing CD3 the date of the software version is
displayed.
6. Press CD 2 button, and the key check mode is activated.
7. In the key check mode, the liquid crystal display displays “K
7. In the key check mode, the liquid crystal display displays “K
0
J 0 V 0”. Each time a button is pressed, “K 0” value increases.
However, once a button is pressed, it is no longer taken into
account.
“V 0” value increases like 1, 2, 3 ... if rotating VOL knob in
“+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
However, once a button is pressed, it is no longer taken into
account.
“V 0” value increases like 1, 2, 3 ... if rotating VOL knob in
“+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
8. To exit from this mode, press three buttons in the same manner
as step 2, or disconnect the power cord.
[MC Test Mode]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.
Procedure:
1.
1.
Press the ?/1 button to turn on the set.
2.
Press the three buttons of x , ENTER and CD 3
simultaneously.
simultaneously.
3.
“MD” is displayed.
4.
Every pressing of EQ EDIT changes the displays in the order
of
of
5.
When the VOL control knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOL MAX” appears for two seconds, then the display returns
to the original display.
the sound volume increases to its maximum and a message
“VOL MAX” appears for two seconds, then the display returns
to the original display.
6.
When the VOL control knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message “VOL MIN” appears for two seconds, then the display
returns to the original display.
slightly, the sound volume decreases to its minimum and a
message “VOL MIN” appears for two seconds, then the display
returns to the original display.
7.
Press the FUNCTION button to the TUNER.
8.
By pressing the TUNING MODE button, select the preset
tuning.
tuning.
9.
The default-preset channel is selected. (It means that the
memory is cleared.)
memory is cleared.)
10. When a tape is inserted in Deck and recording is started, the
input source function selects MD automatically.
11. During the recording by tuning m/M knob, the Tape
(Deck) is selected and tape is rewound. Tape stops at around
the record-starting position and playback of the recorded portion
of the tape is started.
the record-starting position and playback of the recorded portion
of the tape is started.
12. Press ?/1 button to turn the set off. The cold reset is enforced
at the same time.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the optical pick-up.
Procedure:
1. Press ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press three buttons x , FUNCTIO , and CD 2 simultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, turn the m/M knob up to move
1. Press ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press three buttons x , FUNCTIO , and CD 2 simultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, turn the m/M knob up to move
the optical pick-up to outside track, or turn the m/M knob
counter-up to inside track.
counter-up to inside track.
6. To exit from this mode, perform as follows:
1) Move the optical pick-up to the most inside track.
2) Press ?/1 button to turn the set off.
2) Press ?/1 button to turn the set off.
Note:
• Always move the optical pick-up to most inside track when exit-
ing from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
[CD Ship (Memory Clear) Mode]
• Set the CD ship mode and set the default setup when shipped
from the factory at the next AC power on.
Procedure:
1. Press ?/1 button to turn the set on.
2. Select the function “CD ”.
3. Press three buttons x , FUNCTION and CD 1 simultaneously.
4. After the “STANDBY” display blinks six times, a message
1. Press ?/1 button to turn the set on.
2. Select the function “CD ”.
3. Press three buttons x , FUNCTION and CD 1 simultaneously.
4. After the “STANDBY” display blinks six times, a message
“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.
ship mode is set.
[CD Repeat 5 Times Limit Release Mode]
• 5 times limit of repeating CD is released.
Procedure:
1.
1.
Press ?/1 button to turn the set on.
2.
Press three buttons x , FUNCTION and CD 1Z .
3.
The massage “LIMIT OFF” is displayed. 5 times limit of
repeating CD is released.
repeating CD is released.
4.
Cold reset is performed at power off.
“GEQ MIN”t“GEQ FLAT”t“GEQ MAX”
23
HCD-TB20
3.04 – 6.96 mN • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 mN • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
3.04 – 6.96 mN • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 mN • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
6.97 – 14.02 mN • 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
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 demag-
netizer.
netizer.
3.
Do not use a magnetized screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
5.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
Torque Measurement
Record/Playback Head Azimuth Adjustment
Procedure:
1.
1.
Mode : Playback
SECTION 5
MECHANICAL ADJUSTMENTS
Mode
FWD
FWD
back tension
back tension
REV
REV
back tension
back tension
FF/REW
FWD tension
REV tension
Torque meter
Meter reading
SECTION 6
ELECTRICAL ADJUSTMENTS
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.
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.
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
MAIN board
CN322
Pin
CN322
Pin
5
or TP42 (L-CH)
Pin
9
or TP46 (R-CH)
level meter
set
+
–
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
Signal
Used for
Tape
P-4-A100
WS-48B
10 kHz, –10 dB
3 kHz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
24
HCD-TB20
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
Adjustment Location: Record/Playback/Erase Head
Tape Speed Check
Note: Set the test mode using the following method and begin tape
speed adjustment.
Procedure:
With the power turned on, press the x button, ENTER button,
and CD 3 button simultaneously.
(The message “MD” is displayed while in the test mode.)
To exit the test mode, press the "/1 button.
With the power turned on, press the x button, ENTER button,
and CD 3 button simultaneously.
(The message “MD” is displayed while in the test mode.)
To exit the test mode, press the "/1 button.
1.
Insert the WS-48B into deck.
2.
Press the Y button of deck.
3.
Check the reading of frequency counter becomes 3000 ± 90 Hz.
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
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
Pin
6
(GND)
MAIN board
CN322
Pin
CN322
Pin
5
or TP42 (L-CH)
Pin
9
or TP46 (R-CH)
L
R
Record Bias Adjustment
Procedure:
INTRODUCTION
When set to the test mode performed in
When set to the test mode performed in
Tape Speed Adjustment
,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to MD.
(After recording, turn the m/M knob without stopping will
return to the position where recording was started.)
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to MD.
(After recording, turn the m/M knob without stopping will
return to the position where recording was started.)
1.
Press FUNCTION button to select MD. (This step is not
necessary if the above test mode has already been set.)
necessary if the above test mode has already been set.)
2.
Insert a tape into deck, press the REC PAUSE/START button,
and then press the Y button to start recording.
and then press the Y button to start recording.
3.
Mode: Record
5.
Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV653 (L-CH)
and RV603 (R-CH) on the TC board to repeat steps 3 and 4.
adjustment level as follows.
If these levels do not adjustment level, adjust the RV653 (L-CH)
and RV603 (R-CH) on the TC board to repeat steps 3 and 4.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be 0 ± 0.5 dB.
[TC BOARD]
4.
Mode: Playback
recorded
position
position
level meter
set
MAIN board
CN322
Pin
CN322
Pin
5
or TP42 (L-CH)
Pin
9
or TP46 (R-ch)
AF OSC
MD IN
1) 315 Hz
2) 10 kHz
1) 315 Hz
2) 10 kHz
blank tape
CS-123
CS-123
set
attenuator
600
Ω
} 50 mV (–23.8 dB)
Adjustment Location:
[MAIN BOARD]
RV652
(L-CH)
RV602
(R-CH)
(R-CH)
RV653
(L-CH)
RV603
(R-CH)
(R-CH)
Record Level
Record Bias
CN322
TP42
TP46
1
11
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