Sony CX-LDB75 Service Manual ▷ View online
21
CX-LDB75
4-5. HOW TO INSTALL THE ROTARY ENCODER (S702), GEAR (STOCKER COMMUNICATION)
4-6. HOW TO INSTALL THE STOCKER ASSY
2
five solders
6
two gears
(stocker communication)
(stocker communication)
4
gear
(stocker communication)
(stocker communication)
CONNECTOR board
7
two screws
(PTPWH2.6
×
8)
5
screw
(PTPWH2.6
×
8)
3
screw
(PWH2
×
6)
rotary encoder
(S702)
(S702)
gear
(stocker
communication)
(stocker
communication)
– rear –
1
rotary encoder
(S702)
(S702)
Engage the rotary encoder (S702)
and the gear (stocker communication)
as shown below in the figure.
and the gear (stocker communication)
as shown below in the figure.
2
cam
(stocker V)
3
screw
(PTPWH2.6
×
8)
4
two cams
(stocker U/D)
5
two screws
(PTPWH2.6
×
8)
boss
boss
rotary encoder
(S702)
(S702)
Install the stocker assy
fitting three bosses into the
each groove of cam
then fix by rotating the cams
in the direction of arrow.
fitting three bosses into the
each groove of cam
then fix by rotating the cams
in the direction of arrow.
hole
gear
(stocker communication)
(stocker communication)
– rear –
screw
1
Position the hole on the gear
(stocker communication) on the
screw of the rotary encoder (S702).
(stocker communication) on the
screw of the rotary encoder (S702).
To install three cams, align each groove
of the cam with each
of the cam with each
f
mark on the
chassis as shown in the figure.
cam
22
CX-LDB75
SECTION 5
TEST MODE
[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 RAM to initial conditions. Execute this mode when
returning the set to the customer.
Procedure:
1. Press the ?/1 button to turn off the main power.
2. While depressing the i-Bass button, press the ?/1 button.
3. The fluorescent indicator tube does not display any message
2. While depressing the i-Bass button, press the ?/1 button.
3. The fluorescent indicator tube does not display any message
and the set is reset.
[Version Display Mode]
*
The version of the microcomputer is displayed.
Procedure:
1. Press the ?/1 button to turn the set on.
2. To enter the test mode, press three buttons FUNCTION ,
2. To enter the test mode, press three buttons FUNCTION ,
DISPLAY and i-Bass simultaneously. The version of the
microcomputer is displayed.
microcomputer is displayed.
[LCD Check]
*
All fluorecent segments are tested.
Procedure:
1. Press the ?/1 button to the set on.
2. While depressing the FUNCTION button, Press the
2. While depressing the FUNCTION button, Press the
DISPLAY button.
3. The message “CD TEST” is displayed, the initialization is
performed.
Then all segments of the fluorecent indicator tube are turned on.
[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.
to vibration. Use this mode when returning the set to the
customer after repair.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the FUNCTION to CD.
3. Press two buttons of Z CD and > simultaneously for
2. Set the FUNCTION to CD.
3. Press two buttons of Z CD and > simultaneously for
more than two seconds.
4. After a message “MECHA LOCK” is displayed on the
fluorescent indicator tube, the CD ship mode is set and the
power is turned off.
power is turned off.
[Disc Tray Lock]
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure :
disc in the store is equipped.
Setting Procedure :
1. Press the ?/1 button to turn the set on.
2. Press two buttons of x and Z CD simultaneously for five
2. Press two buttons of x and Z CD simultaneously for five
seconds.
3. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press two buttons of x and Z CD simultaneously for five
seconds again.
2. The message “UNLOCKED” is displayed and the tray is
unlocked.
Note :
When “LOCKED” is displayed, the tray lock is not released
by turning power on/off with the ?/1 button.
[AMP Test]
*
This mode is used to check the function of the amplifier.
Procedure:
1. Press the ?/1 button to turn the set on.
2. While depressing the x button, Press the DISPLAY button.
3. The message “Volume MAX” is displayed, when the
2. While depressing the x button, Press the DISPLAY button.
3. The message “Volume MAX” is displayed, when the
VOLUME knob is rotated clockwise. The message “Volume
MIN” is displayed, when the VOLUME knob is rotated
counterclockwise.
MIN” is displayed, when the VOLUME knob is rotated
counterclockwise.
4. Each time the BASS or TREBLE knob is turned, the message
“EQ MAX”, “EQ MIN” or “EQ FLAT” is displayed in this
order.
order.
[AM Channel Step 9 kHz/10kHz Selection Mode]
*
Either the 9 kHz step or 10 kHz step can be selected for the
AM channel step. (EXCEPT AEP)
AM channel step. (EXCEPT AEP)
Procedure:
1. Set the FUNCTION to AM.
2. While depressing the > button, press the ?/1 button.
3. The channel step is changed over.
2. While depressing the > button, press the ?/1 button.
3. The channel step is changed over.
[CD Test Mode]
*
This mode can run the CD sled motor freely. Use this mode,
for instance, when cleaning the pickup.
for instance, when cleaning the pickup.
Procedure:
1. Press the ?/1 button to turn the set on.
2. While depressing the CD u button, Press the DIRECTION
2. While depressing the CD u button, Press the DIRECTION
button. The message “CD TEST” is displayed.
3. With the CD in stop status, press the > button to move the
pickup to outside track, or press the . button to inside
track.
track.
4. When press the CD u button, normal playback is performed.
5. Each time the CD u button is pressed during normal
5. Each time the CD u button is pressed during normal
playback, the tracking servo is switched on or off.
6. To exit this mode, either change to other functions or extract
an AC plug.
[CD Repeat 5 Times Limit Release Mode]
Procedure:
1. Press the ?/1 button to turn the set on.
2. Select the FUNCTION to CD.
3. Press two buttons of > and DIRECTION simultaneously.
4. The repeat all mark blinks and then repeat 5 times limit is
2. Select the FUNCTION to CD.
3. Press two buttons of > and DIRECTION simultaneously.
4. The repeat all mark blinks and then repeat 5 times limit is
released.
23
CX-LDB75
2.94 – 7.84 mN • m
(30 to 79 g • cm)
(0.42 – 1.11 oz • inch)
0.15 – 0.59 mN • m
(2 to 6 g • cm)
(0.03 – 0.08 oz • inch)
2.94 – 7.84 mN • m
(30 to 79 g • cm)
(0.42 – 1.11 oz • inch)
0.15 – 0.59 mN • m
(2 to 6 g • cm)
(0.03 – 0.08 oz • inch)
6.86 – 17.64 mN • m
(70 to 179 g • cm)
(0.98 – 2.49 oz • inch)
0.98 mN • m or more
(10 • cm or more)
(0.14 oz • inch or more)
0.98 mN • m or more
(10 • cm or more)
(0.14 oz • inch or more)
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
TAPE MECHANISM DECK SECTION
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 demag-
netizer.
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
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter
Meter reading
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : Playback
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.
so that outputs match within 1 dB of peak.
DECK SECTION 0 dB=0.775V
Precaution
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
3. After the adjustments, apply suitable locking compound to
the parts adjusted.
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
adjustment should be completed before performing recording
circuit adjustment.)
adjustment 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 otherwise
specified.
• Test Tape
Signal
Used for
Tape
P-4-A100
WS-48B
10 kHz, –10 dB
3 kHz, 0 dB
Azimuth Adjustment
Tape Speed Check
SECTION 6
MECHANICAL ADJUSTMENTS
SECTION 7
ELECTRICAL ADJUSTMENTS
set
MAIN board
SPEAKER terminal (J201)
L-CH, R-CH
SPEAKER terminal (J201)
L-CH, R-CH
+
–
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
P-4-A100
(10 kHz, – 10 dB)
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
24
CX-LDB75
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
Adjustment Location: Record/Playback/Erase Head
3. Mode: Playback
set
test tape
P-4-A100
(10 kHz, – 10 dB)
P-4-A100
(10 kHz, – 10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
MAIN board
SPEAKER terminal (J201)
L-CH
SPEAKER terminal (J201)
L-CH
Tape Speed Check
Mode: Playback
Note: Refer to “3-7. Cassette Panel” (see page 10)
adjustment screw
1. Insert the WS-48B into deck.
2. Press the TAPE nN button of deck.
3. Confirm that the frequency counter reads 3000
2. Press the TAPE nN button of deck.
3. Confirm that the frequency counter reads 3000
± 90 Hz.
Sample Value of Wow and flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
MAIN board
SPEAKER terminal (J201)
L-CH, R-CH
SPEAKER terminal (J201)
L-CH, R-CH
frequency counter
Record Bias Adjustment
Procedure:
1. Record mode
2. Mode: Playback
i-Bass OFF
BASS 0
TREBLE 0
BASS 0
TREBLE 0
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: 0
± 1.0 dB (0 ± 4.5mV).
attenuator
set
MAIN board
AUX IN (J602)
AUX IN (J602)
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (–23.8 dB)
600
Ω
blank tape
CN-123
CN-123
AF OSC
+
–
–
set
recorded
portion
portion
MAIN board speaker terminal (J201)
level meter
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