Sony XR-4750-RDS, XRC-450-RDS Service manual
XR-4750RDS/C450RDS
AEP Model
SERVICE MANUAL
Ver 1.1 2001.06
UK Model
For RM-X2S (Remote Commander),
please refer to RM-X2S/X3S Service
Manual (9-960-039-S) previously issued.
Photo: XR-C450RDS
SPECIFICATIONS
Model Name Using Similar Mechanism NEW
T ape Transport Mechanism T ype
MG-25B-136
FM/MW/LW CASSETTE CAR STEREO
9-925-542-12 Sony Corporation
2001F0500-1 e Vehicle Company
C 2001.6 Shinagawa Tec Ser vice Manual Production Group
TABLE OF CONTENTS
SERVICING NOTES
1. GENERAL
Location of Controls .......................................................... 3
Setting the Clock ............................................................... 4
Using the Rotary Remote .................................................. 4
Adjusting the Sound Characteristics ................................. 5
Muting the Sound .............................................................. 5
Changing the Sound and Beep Tone .................................. 5
Installation ......................................................................... 6
Connections ....................................................................... 7
2. DISASSEMBLY............................................................ 10
3. ASSEMBLY OF MECHANISM DECK ............. 12
4. MECHANICAL ADJUSTMENTS ......................... 15
5. ELECTRICAL ADJUSTMENTS
Test Mode .......................................................................... 15
Tape Deck Section ............................................................. 15
Tuner Section..................................................................... 16
6. DIAGRAMS
6-1. Printed Wiring Boards – Main Section – .......................... 22
6-2. Schematic Diagram – Main Section – ............................... 25
6-3. Printed Wiring Board – Display Section – ....................... 30
6-4. Schematic Diagram – Display Section – .......................... 32
6-5. IC Pin Function Description.............................................. 35
Flexible Circuit Board Repairing
• Keep the temperature of 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 –
– 9 –
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
– 10 –
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
4
eight screws
(PTT2.6 × 8)
1
screw
(PTT2.6 × 8)
5
heat sink
– 11 –
1
two screws
(PTT2.6 × 8)
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.
– 12 –
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
C
2
Pull the lever in the
arrow direction.
3
Fit the lever (LDG-B) on
shafts A and C and
install it.
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).
– 13 –
GUIDE (C)
1
three claws
2
guide (C)
– 14 –
SECTION 4
r
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
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 damagnetizer.
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 rated power supply voltage unless otherwise noted.
• Torque Measurement
Mode Torqu Meter Meter Reading
Foward 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
• Tape Tension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A
Reverse CQ-403R
CQ-102C
CQ-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)
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM (MW) Auto Scan/Stop Level 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 “B” position.
See the adjustment location from on page 18 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
speaker out terminal
frequency counte
4
Ω
+–
Specification: Constant speed
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075 Hz
Adjustment Location: See page 18.
– 15 –
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