Read Sony XR-4890 (serv.man2) Service Manual online
MICROFILM
SERVICE MANUAL
US Model
Canadian Model
Model Name Using Similar Mechanism
XR-C5100
Tape Transport Mechanism Type
MG-25F-136
SPECIFICATIONS
XR-4890
Photo: XR-4890
FM/AM CASSETTE CAR STEREO
– Continued on next page –
– 2 –
TABLE OF CONTENTS
1.
GENERAL
Location of Controls ....................................................... 3
Resetting the Unit ........................................................... 4
Detaching the Front Panel ............................................... 4
Setting the Clock ............................................................. 4
Installation ....................................................................... 5
Connections ..................................................................... 6
Resetting the Unit ........................................................... 4
Detaching the Front Panel ............................................... 4
Setting the Clock ............................................................. 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 .................................................................. 14
Tuner Section .................................................................. 14
6.
DIAGRAMS
................................................................. 15
6-1. Printed Wiring Board –MAIN Section– ........................ 17
6-2. Schematic Diagram –MAIN (1/2) Section– .................. 19
6-3. Schematic Diagram –MAIN (2/2) Section– .................. 21
6-4. Printed Wiring Board –PANEL Section– ...................... 23
6-5. Schematic Diagram –PANEL Section– ......................... 25
6-6. IC Pin Function Description ........................................... 27
6-2. Schematic Diagram –MAIN (1/2) Section– .................. 19
6-3. Schematic Diagram –MAIN (2/2) Section– .................. 21
6-4. Printed Wiring Board –PANEL Section– ...................... 23
6-5. Schematic Diagram –PANEL Section– ......................... 25
6-6. IC Pin Function Description ........................................... 27
7.
EXPLODED VIEWS
................................................ 29
8.
ELECTRICAL PARTS LIST
............................... 32
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-
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
– 3 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
instruction manual.
– 4 –
