Sony CX-LEM550 / XR-EM550 Service Manual ▷ View online
10
CX-LEM550
3-4. BASE UNIT (BU-K7BD81B)
3-5. TAPE CASSETTE MECHANISM DECK
1
three screws
(BTP2.6
(BTP2.6
×
8)
3
wire (flat type) (27core)
(CN201)
(CN201)
2
CD cover
6
two screws
7
two washers
4
two screws
5
two washers
8
base unit
(BU-K7BD81B)
(BU-K7BD81B)
2
four screws
(BVTP3
(BVTP3
×
10)
3
two harness
4
plate (shield cassette)
5
tape cassette mechanism deck
(CMAL1Z240A)
(CMAL1Z240A)
1
wire (flat type) (7 core)
11
CX-LEM550
3-6. MAIN BOARD
3-7. AMP BOARD
4
screw
(BVTP3
(BVTP3
×
10)
8
MAIN board
7
tuner (FM/AM)
1
connector (CN307)
2
connector (CN308)
3
connector (CN903)
5
6
Remove the solder.
3
two screws
(BVTP3
(BVTP3
×
14)
2
connector
(CN308)
(CN308)
4
AMP board
1
connector
(CN307)
(CN307)
12
CX-LEM550
SECTION 4
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 the power on.
2. While pressing the x button, press the ?/1 button and turn
2. While pressing the x button, press the ?/1 button and turn
the [VOLUME] knob in the counter-clock wise.
3. The message “RESET” is displayed and the set is reset.
PANEL TEST
•
All segments of liquid crystal display are tested, and the version
and released date of the micro computer are displayed.
and released date of the micro computer are displayed.
Procedure:
1. Press the ?/1 button to turn the power on.
2. While pressing the [DISPLAY] button, press the ?/1 button
2. While pressing the [DISPLAY] button, press the ?/1 button
and turn the [VOLUME] knob in the counter-clock wise.
Then all segments of liquid crystal display are turned on.
Then all segments of liquid crystal display are turned on.
3. Press the [i-BASS] button, the version and released date of the
micro computer are displayed.
example of display:
0116 V202
4. Press the [BASS/TREBLE] button, the model name and
distination are displayed.
example of display:
A20 CE2
5. To exit from this mode, perform the “COLD RESET”.
TUNER STEP CHANGE-OVER
(EXCEPT FOR AEP, UK MODEL)
(EXCEPT FOR AEP, UK MODEL)
•
Either the 9 kHz step or 10 kHz step can be selected for the
AM channel step.
AM channel step.
Procedure:
1. Set the FUNCTION to AM, and press the ?/1 button to turn
the power off.
2. While depressing the [TUNING + ] button, press the
?/1 button.
3. The message “9K STEP” or “10K STEP” is displayed on the
liquid crystal display, and thus the channel step is changed
over.
over.
M >
Version of micro computer
(In this case, version 202)
(In this case, version 202)
released date of micro computer
(In this case, released of January 16)
(In this case, released of January 16)
distination
(In this case, UK model)
(In this case, UK model)
model name
(In this case, CX-LEM550)
(In this case, CX-LEM550)
13
CX-LEM550
SECTION 5
MECHANICAL ADJUSTMENTS
TAPE MECHANISM DECK SECTION
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head
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
Mode
Torque meter
Meter reading
3.04 mN • m to 6.96 mN • m
FWD
CQ-102C
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.20 mN • m to 0.58 mN • m
FWD
CQ-102C
2 to 6 g • cm
back tension
(0.02 – 0.08 oz • inch)
3.04 mN • m to 6.96 mN • m
REV
CQ-102RC
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.20 mN • m to 0.58 mN • m
REV
CQ-102RC
2 to 6 g • cm
back tension
(0.02 – 0.08 oz • inch)
6.97 mN • m to 14.02 mN • m
FF/REW
CQ-201B
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.8 mN • m or more
FWD tension
CQ-403A
100 g • cm or more
(1.4 oz • inch or more)
9.8 mN • m or more
REV tension
CQ-403R
100 g • cm or more
(1.4 oz • inch or more)
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION 0 dB = 0.775 V
Precaution
1. Demagnetize the record/playback head with a head demagne-
tizer.
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
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Check
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.
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
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
set
MAIN board
SPEAKER terminal (J302)
L-CH, R-CH
SPEAKER terminal (J302)
L-CH, R-CH
+
–
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
P-4-A100
(10 kHz, – 10 dB)
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