background image
SERVICE MANUAL
VW
GAMMA V
MODEL


background image
­ 1 ­
SERVICE MANUAL
AEP Model
XR-5W497RB
FM/AM CASSETTE CAR STEREO
MICROFILM
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.
Dolby noise reduction manufactured under license from Dolby Labo-
ratories Licensing Corporation.
"DOLBY" and the double-D symbol
a are trademarks of Dolby
Laboratories Licensing Corporation.


background image
­ 2 ­
TABLE OF CONTENTS
1. DISASSEMBLY
1-1. Cover (Upper) .................................................................... 3
1-2. Front Panel Assy ................................................................ 3
1-3. Mechanism Deck Block ..................................................... 4
1-4. Cover (Lower) .................................................................... 4
1-5. Heat Sink ............................................................................ 5
1-6. Main Board ........................................................................ 5
2. DIAGRAMS
2-1. IC Pin Descriptions ............................................................ 6
2-2. Block Diagram ­ Tape Section ­ ...................................... 11
2-3. Block Diagram ­ Tuner Section ­ .................................... 13
2-4. Block Diagram ­ DSP Section ­ ...................................... 15
2-5. Printed Wiring Board ­ Main Section ­ ........................... 17
2-6. Schematic Diagram ­ Main Section ­ .............................. 21
2-7. Printed Wiring Boards ­ TIM/DSP Section ­ .................. 26
2-8. Schematic Diagram ­ TIM Section ­ ............................... 28
2-9. Schematic Diagram ­ DSP Section ­ ............................... 31
2-10. Printed Wiring Board ­ Connector Section ­ ................... 35
2-11. Schematic Diagram ­ Connector Section ­ ..................... 37
2-12. Printed Wiring Board ­ Panel Section ­ ........................... 40
2-13. Schematic Diagram ­ Panel Section ­ ............................. 43
3. EXPLODED VIEWS
3-1. Main Section .................................................................... 51
3-2. Front Panel Section .......................................................... 52
4. ELECTRICAL PARTS LIST .................................... 53
SERVICE NOTE
Each time the power is turned on, the security must be released
before the set can be operated.
Method of Releasing the Security of the XR-5W497RB
1. Turn on the power from the power cord.
2. Wait until the LCD display changes from "SAFE" to "1000".
3. Input "1234" with the preset buttons on the set.
Input method:
Push the preset button 1 once, button 2 twice, button 3 three
times, and button 4 four times.
4. Press and hold down the
, or · button for two seconds.
Note : If an attempt to release the security by this method fails
twice, the system is locked.
In this case, allow the set to be activated for about one hour,
then turn off the power and perform the following steps again.


background image
­ 3 ­
1 PTT 2.6X6
3 claw
4 claw
5 claws
6 cover (upper)
2 claw
1 screw (2x4.5)
2 screw (2x4.5)
3 claws
4 claws
5 connector
6 front panel assy
1-2. FRONT PANEL ASSY
SECTION 1
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
1-1. COVER (UPPER)


background image
­ 4 ­
1 PTT 2.6X6
2 PTT 2.6X6
3 connector
4 connector
5 mechanism deck block
1 PTT 2.6X6
2 claw
3 claw
4 claw
5 claws
6 cover (lower)
7 insulating sheet
1-3. MECHANISM DECK BLOCK
1-4. COVER (LOWER)