Sony EXR-105 Service manual
EXR-105/XR-3740
SERVICE MANUAL
Photo: XR-3740
US Model
Canadian Model
EXR-105
E Model
XR-3740
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type
MG-25A-136
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 58 dB
Tuner section
FM
Tuning range 87.5 – 107.9 MHz
Aerial 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),
68 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 2dB
AM
Tuning range 530 – 1,710 kHz
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
SPECIFICATIONS
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 35 W × 4 (at 4 ohms)
General
Outputs Power antenna control lead/
Power amplifier control lead/
Telephone mute control lead (XR-3740 only)
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 × 184 mm (w/h/d)
Mounting dimensions Approx. 182 × 53 × 164 mm (w/h/d)
Mass Approx. 1.3 kg
Supplied accessories Parts for installation and connections (1 set)
Front panel case (1)
Design and specifications are subject to change without notice.
MICROFILM
FM/AM CASSETTE CAR STEREO
TABLE OF CONTENTS
SERVICING NOTES
1. GENERAL
Location of Controls ........................................................ 3
Getting started ................................................................. 3
Setting the Clock ............................................................. 4
Adjusting the Sound Characteristics ............................... 4
Muting the Sound ............................................................ 4
Changing the Sound and Beep Tone................................ 4
Installation ....................................................................... 5
Connections ..................................................................... 6
2. DISASSEMBLY.......................................................... 8
3. ASSEMBLY OF MECHANISM DECK ........... 10
4. MECHANICAL ADJUSTMENTS ....................... 13
5. ELECTRICAL ADJUSTMENTS ......................... 13
6. DIAGRAMS
6-1. IC Pin Function Description ............................................ 14
6-2. Printed Wiring Board – MAIN Section –....................... 19
6-3. Schematic Diagram – MAIN Section – .......................... 21
6-4. Printed Wiring Board – KEY Section – ......................... 25
6-5. Schematic Diagram – KEY Section – ............................ 27
7. EXPLODED VIEWS ................................................ 29
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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.
8. ELECTRICAL PARTS LIST................................ 32
– 2 –
SECTION 1
GENERAL
This section is extracted
from instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
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
2
1
3
cover ass’y
2
1
– 8 –
SUB PANEL, MECHANISM DECK (MG-25A-136)
3
connector
(CN302)
2
sub panel
1
three screws
(PTT2.6 × 8)
5
screw
(PTT2.6 × 6)
6
mechanism deck
(MG-25A-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
5
heat sink
4
seven screws
(PTT2.6 × 10)
screw
(PTT2.6 × 8)
– 9 –
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
Holder 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.
– 10 –
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
2
Pull the lever in the
arrow direction.
shaft
B
3
Fit the lever (LDG-B) on
shafts A and B and
install it.
GEAR (LDG-FT)
hole
hole
gear (LDG-D)
lever (LDG-A)
gear (LDG-FB)
5
gear (LDG-FT)
5
polyethyene 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 the lever (LDG-A).
– 11 –
GUIDE (C)
1
three claws
2
guide (C)
– 12 –
set
+–
test tape
WS-48A
(3 kHz, 0 dB)
speaker out terminal
4
Ω
speed checker
or
frequency counter
SECTION 4
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.
• Torque 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
CQ-102C
CA-102RC
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
0.5 - 4.5g•cm
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
0.5 - 4.5g•cm
60 - 200 g•cm
(0.83 - 2.78 oz•inch)
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=0.775 VTAPE DECK SECTION
Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
Specification: Constant speed
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075 Hz
Adjustment Location:
– SET UPPER VIEW –
• Tape T ension Measurement
Mode Torqu Meter Meter Reading
Forward CQ-403A
Reverse CQ-403R
more than 90 g
(more than 3.18 oz)
more than 90 g
(more than 3.18 oz)
TAPE SPEED ADJUSTMENT
– 13 –
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