Sony XR-4740RDS, XR-C430RDS, XR-C440RDS Service manual
XR-4740RDS/C430RDS/C440RDS
SERVICE MANUAL
Ver 1.1 2001.06
Photo: XR-C430RDS
For RM-X2S (Remote Commander),
please refer to RM-X2S/X3S Service
Manual (9-960-039-∏) previously issued.
(XR-C440RDS ONLY)
SPECIFICATIONS
Cassette player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.08% (WRMS)
Frequency response 30 – 18,000 Hz
Signal-to-noise ratio
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 35 W × 4 (at 4 ohms)
AEP Model
UK Model
MG-25B-136
Tuner section
FM
Tuning range 87.5 – 108.0 MHz
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
70 dB (mono)
Harmonic distortion at 1 kHz
0.5% (stereo),
0.3% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz
Capture ratio 4 dB
MW/LW
Tuning range MW: 531 – 1,602 kHz
LW: 153 – 281 kHz
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity MW: 30 µV
LM: 50 µV
FM/MW/LW CASSETTE CAR STEREO
9-925-541-12 Sony Corporation
2001F0500-1 e Vehic le Company
C 2001.6 Shinagawa Tec Service Manual Production Group
General
Outputs
(XR-C430RDS/C440RDS):
Power amplifier control lead
Rear line out (1)
Tone controls Bass ± 8 dB at 100 Hz
Treble ± 8 dB at 10 kHz
Power requirements 12 V DC car battery (negative ground)
Dimensions Approx. 188 × 58 × 181 mm (w/h/d)
Mounting dimensions Approx. 182 × 53 × 164 mm (w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and connections (1 set)
Front panel case (1)
XR-C440RDS: Rotary commander RM-X2S
Design and specifications are subject to change without notice.
– Continued on next page –
TABLE OF CONTENTS
SERVICING NOTES
1. GENERAL
Location of Controls .......................................................... 3
Setting the Clock ............................................................... 3
Using the rotary remote ..................................................... 3
Adjusting the sound characteristics ................................... 4
Muting the sound ............................................................... 4
Changing the sound and beep tone .................................... 4
Installation ......................................................................... 5
Connections ....................................................................... 6
2. DISASSEMBLY............................................................ 9
3. ASSEMBLY OF MECHANISM DECK ............. 11
4. MECHANICAL ADJUSTMENTS ......................... 14
5. ELECTRICAL ADJUSTMENTS
Tape Deck Section ............................................................. 14
Tuner Section..................................................................... 15
6. DIAGRAMS
6-1. Printed Wiring Boards – Main Section –........................... 23
6-2. Schematic Diagram – Main Section – ............................... 25
6-3. Printed Wiring Board – Key Section – .............................. 30
6-4. Schematic Diagram – Key Section – ................................. 32
6-5. IC Pin Description ............................................................. 35
Flexible Circuit Board Repairing
• Keep the temperature the soldering iron around 270° C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering or
unsoldering.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
7. EXPLODED VIEWS ................................................... 37
8. ELECTRICAL PARTS LIST .................................... 40
– 2 –
SECTION 1
GENERAL
This section is extracted
from instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
– 8 –
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
FRONT PANEL ASS’Y
1
Push the button
(release).
A
2
Remove the front panel ass’y
to the direction of the arrow A.
COVER ASS’Y
1
2
3
cover ass’y
2
1
– 9 –
SUB PANEL, MECHANISM DECK (MG-25B-136)
3
connector
(CN302)
2
sub panel
1
three screws
(PTT2.6 × 8)
5
screw
(PTT2.6 × 6)
6
mechanism deck
(MG-25B-136)
4
flexible flat cable
(CN301)
1
three screws
(PTT2.6 × 8)
MAIN BOARD, HEAT SINK
2
two ground point
screws
3
main board
1
two screws
(PTT2.6 × 8)
1
5
heat sink
4
seven screws
(PTT2.6 × 8)
screw
(PTT2.6 × 8)
– 10 –
SECTION 3
ASSEMBLY OF MECHANISM DECK
Note: Follow the assembly procedure in the numerical order given.
HOUSING
4
Fit claw on B part.
3
2
Install the hanger onto
two claws of the housing.
Put the housing
under A part.
housing
A
part
5
Fit projection on C part.
C
part
7
Hold the hanger by bending the claw.
1
Install the catch to the hanger.
hanger
6
Fit projection on D part.
8
Hold the hanger by
bending the claw.
D
part
ARM (SUCTION)
B
projection
part
2
Move the arm (suction) in the arrow
direction and fit on projection.
1
Fit the arm (suction) on the shaft.
– 11 –
LEVER (LDG-A) / (LDG-B)
shaft
A
shaft
1
Fit the lever (LDG-A) on
shafts A – C and install it.
B
shaft
C
4
type-E stop ring 2.0
shaft
A
shaft
2
Pull the lever in the
arrow direction.
3
Fit the lever (LDG-B) on
shafts A and C and
install it.
C
GEAR (LDG-FT)
hole
hole
gear (LDG-D)
lever (LDG-A)
gear (LDG-FB)
4
gear (LDG-FT)
5
polyethylene washer
1
2
Move the lever (LDG-B)
in the arrow direction.
tension spring (lever LDG)
3
Align hole in the gear (LDG-D)
with hole in the lever (LDG-A).
– 12 –
GUIDE (C)
1
three claws
2
guide (C)
– 13 –
SECTION 4
r
MECHANICAL ADJUSTMENTS
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt capstan
idlers
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the power supply
voltage unless otherwise noted.
• T orque Measurement
Mode Torqu Meter Meter Reading
Forward CQ-102C
Forward
Back Tension (0.01 – 0.06 oz•inch)
Reverse CQ-102RC
Reverse
Back Tension (0.01 – 0.06 oz•inch)
FF, REW CQ-201B
• T ape Tension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A
Reverse CQ-403R
CQ-102C
CA-102RC
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.5 – 4.5 g•cm
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.5 – 4.5 g•cm
60 – 200 g•cm
(0.83 – 2.78 oz•inch)
more than 90 g
(more than 3.18 oz)
more than 90 g
(more than 3.18 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM (MW) Auto Scan/Stop Le vel adjustments
can be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “power select” switch (S801) is “A” position.
2. Turn ON the regulated po wer supply . (All LEDs on the set lights
up, and the clock is displayed.)
Note:Press the OFF button, if the clock is not displayed.
3. Push the preset 4 button.
4. Push the preset 5 button.
5. Press the preset 1 button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the OFF button.
2. Set the “power select” switch (S801) is “original” position.
See the adjustment location from on page 17 for the adjustment.
0 dB=0.775 VTAPE DECK SECTION
Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
speed checker
or
test tape
WS-48A
(3 kHz, 0 dB)
set
frequency counte
4
Ω
+–
speaker out terminal
Specification: Constant speed
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075Hz
Adjustment Location: See page 17.
– 14 –
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 60 dB (1 mV)
Mode : mono
Modulation : 1 kHz, 75 kHz deviation (100%)
0.01µF
set
antenna jack (J1)
+
–
speaker out terminal
level meter
4
Ω
TUNER SECTION
0dB=1µV
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
[Note]
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM Noise Focus Adjustment
4. FM signal Meter Adjustment
5. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 22 dB (12.6
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
antenna jack (J1)
0.01µF
set
µ
V)
Procedure:
1. Set to the test mode. (See page 14).
2. Push the SOURCE button and set to FM.
Display
REG
FM
INTRO
FM Stereo Separation Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 20 kHz deviation (22.6%)
antenna jack (J1)
0.01µF
set
sub: 1 kHz, 20 kHz deviation (22.6%)
19 kHz pilot: 7.5 kHz deviation (10%)
4
Speaker out terminal
level meter
Ω
Procedure:
FM Stereo
signal generator
output channel
Level meter Level meter
connection reading (dB)
L-CH L-CH A
B
R-CH L-CH Adjust RV4 on TU1
for minimum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV4 on TU1
for minimum reading.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 30 dB
Adjustment Location: See page 17.
+
–
3. Adjust with the volume RV2 on TU1 so that the “FM” indication turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Adjustment Location: See page 17.
Display
REG
FM Noise Focus Adjustment
Setting:
SOURCE button: FM
INTRO
Procedure:
1. Tune the 98.00 MHz.
2. The then output level is supposing that (B) dB.
3. Adjust with the volume RV3 on TU1 so that the output level is
(B) –32 dB then signal generator input set to –20 dB.
Adjustment Location: See page 17.
– 15 –
FM Signal Meter Adjustment
(
)
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 35 dB (56.2
Mode : mono
Modulation : no modulation
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the SOURCE button and set to FM.
3. Push the preset 6 button.
4. Adjust RV1 on MAIN BOARD so that the display indication is
“160”.
antenna jack (J1)
0.01µF
Display
REG
set
µ
V)
INTRO
MW Auto Scan/Stop Level Adjustment
Make this adjustment after “FM A uto Scan/Stop Level Adjustment”.
Setting:
SOURCE button: MW
30
Ω
15 pF
65 pF
MW RF signal
generator
MW dummy antenna
(50 Ω)
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level : 33 dB
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the SOURCE button and set to MW.
44.7 µV
Display
set
antenna jack (J1)
Display
REG
Specification: Display indication: 158 to 162
Adjustment Location: See page 17.
INTRO
MW
INTRO
999
3. Adjust with the volume RV1 on TU1 so that the “MW” indication turns to “MW0” indication on the display window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
Display
999
Adjustment Location: See page 17.
INTRO
– 16 –
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