Sony XR-4790 / XR-4800 / XR-7850 (serv.man2) Service Manual ▷ View online
MICROFILM
SERVICE MANUAL
FM/MW/LW CASSETTE CAR STEREO
AEP Model
UK Model
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MG-25G-136
SPECIFICATIONS
XR-4790/4800
Photo: XR-4800
– 2 –
TABLE OF CONTENTS
1.
GENERAL
Location of Controls (XR-4790) .................................... 3
Location of Controls (XR-4800) .................................... 4
Installation ....................................................................... 5
Connections ..................................................................... 6
Location of Controls (XR-4800) .................................... 4
Installation ....................................................................... 5
Connections ..................................................................... 6
2.
DISASSEMBLY
......................................................... 8
3.
ASSEMBLY OF MECHANISM DECK
........... 10
4.
MECHANICAL ADJUSTMENTS
....................... 13
5.
ELECTRICAL ADJUSTMENTS
Test Mode ........................................................................ 13
Tape Deck Section .......................................................... 13
Tuner Section .................................................................. 14
Tape Deck Section .......................................................... 13
Tuner Section .................................................................. 14
6.
DIAGRAMS
6-1. Printed Wiring Boards –Main Section– .......................... 20
6-2. Schematic Diagram –Main Section– ............................. 23
6-3. Printed Wiring Board –Panel Section– (XR-4790) ....... 28
6-4. Schematic Diagram –Panel Section– (XR-4790) ......... 31
6-5. Printed Wiring Board –Panel Section– (XR-4800) ....... 33
6-6. Schematic Diagram –Panel Section– (XR-4800) ......... 35
6-7. IC Pin Function Description ........................................... 37
6-2. Schematic Diagram –Main Section– ............................. 23
6-3. Printed Wiring Board –Panel Section– (XR-4790) ....... 28
6-4. Schematic Diagram –Panel Section– (XR-4790) ......... 31
6-5. Printed Wiring Board –Panel Section– (XR-4800) ....... 33
6-6. Schematic Diagram –Panel Section– (XR-4800) ......... 35
6-7. IC Pin Function Description ........................................... 37
7.
EXPLODED VIEWS
................................................ 40
8.
ELECTRICAL PARTS LIST
............................... 44
Flexible Circuit Board Repairing
•
Keep the temperature of the soldering iron around 270 ˚ C dur-
ing repairing.
ing repairing.
•
Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
circuit board (within 3 times).
•
Be careful not to apply force on the conductor when soldering
or unsoldering
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.
aged by heat.
– 3 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
instruction manual.
(XR-4790)
– 4 –
(XR-4800)
