SONY CAR STEREO Service Manual
XR-1790
SERVICE MANUAL
SPECIFICATIONS
Saudi Arabia Model
Model Name Using Similar Mechanism XR-1804
T ape Transport Mechanism Type MG-36SZ9-32
MICROFILM
FM/AM CASSETTE CAR STEREO
TABLE OF CONTENTS
1. GENERAL
Location of Controls ....................................................... 3
Setting the Clock ............................................................. 3
Installation....................................................................... 4
Connections ..................................................................... 6
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.
2. DISASSEMBLY ......................................................... 7
3. MECHANICAL ADJUSTMENTS....................... 11
4. ELECTRICAL ADJUSTMENTS
Tape Deck Section .......................................................... 11
Tuner Section .................................................................. 12
5. DIAGRAMS
5-1. Notes for Printed Wiring Board and
Schematic Diagram ......................................................... 14
5-2. Printed Wiring Board – MAIN Board – ........................ 15
5-3. Schematic Diagram – MAIN Board (1/2) – ................... 16
5-4. Schematic Diagram – MAIN Board (2/2) – ................... 17
5-5. Printed Wiring Board – CONTROL Board – ................ 18
5-6. Schematic Diagram – CONTROL Board –................... 18
5-7. IC Pin Function Description ........................................... 20
6. EXPLODED VIEWS ................................................ 22
7. ELECTRICAL PARTS LIST ............................... 28
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
2
SECTION 1
GENERAL
This section is extracted from
instruction manual.
3
456
SECTION 2
n
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
FRONT PANEL ASS’Y
3
4
three claws
2
1
top cover
2
1
5
front panel ass’y
MECHANISM DECK SECTION (MG-36SZ9-32)
2
two screws
1
connector
(CN901)
(PTT2.6
×
6)
4
two claws
2
two screws
(PTT2.6
×
6)
3
mechanism deck sectio
(MG-36SZ9-32)
7
MAIN BOARD, HEAT SINK
)
2
two screws
(ground point)
3
main board
4
five screws
(PTT2.6 × 8)
1
two screws
(PTT2.6 × 6)
5
heat sink
BRACKET (MD)
1
two screws
(P2.6 × 4)
1
two screws
(P2.6 × 4)
2
bracket (MD
8
MOTOR ASS’Y (CAPSTAN/REEL) (M901)
2
belt
3
belt
1
two screws
×
3)
(P2
4
motor ass’y (capstan/reel)
(M901)
CASSETTE HANGER (X)
4
2
Remove the return link
toward direction.
two claws
3
boss
3
1
Remove the claw toward
direction.
5
cassette hanger (x)
boss
1
Remove the claw toward
direction.
9
CASSETTE HOLDER (X)
)
1
A
Push the arrow A part.
2
Removal the cassette holder (x
to direction of the arrow.
10
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