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3

................................................

4

Location of Controls .......................................................

5

3-1. Disassembly Flow ........................................................... 10
3-2. Front Panel Section ......................................................... 11
3-3. DISPLAY Board ............................................................. 11
3-4. Chassis (T) Section ......................................................... 12
3-5. MD Mechanism Deck (MG-164MF-138) ...................... 12
3-6. POWER Board, Chassis (T) Assy .................................. 13
3-7. Heat Sink ......................................................................... 13
3-8. SERVO (MD) Board ....................................................... 14
3-9. MD Cover Assy ............................................................... 14
3-10. Float Block ...................................................................... 15
3-11. LO Motor Assy ................................................................ 15
3-12. Lever Assy (LE) .............................................................. 16
3-13. Holder Assy ..................................................................... 16
3-14. Chucking ARM Assy ...................................................... 17
3-15. Optical Pick-up (KMS-241C) ......................................... 17
3-16. SL Motor Assy (SLED) (M902)/

SP Motor Assy (SPINDLE) (M901) ............................... 18

3-17. CD Mechanism Deck (MG-398D-121) .......................... 18
3-18. Motor Assy (Front Panel Open/Close) (M640) .............. 19
3-19. MAIN Board, Chassis (B) Assy ..................................... 19
3-20. Bracket (MAIN) .............................................................. 20
3-21. Chassis (T388) Assy ....................................................... 20
3-22. Sensor (CD) Board .......................................................... 21
3-23. Servo Board, LO Motor SUB Assy (Loading)

(M103) ............................................................................. 21

3-24. ARM Roller Assy, LOAD Board .................................... 22
3-25. Floating Block Assy ........................................................ 22
3-26. Optical Pick-up (KSS-720A), Sled Motor Assy

(M101) ............................................................................. 23

4-1. Assembly of ARM (L/R) Assy ....................................... 23

5-1. Block Diagram  – CD SERVO Section – ....................... 24
5-2. Block Diagram  – MD SERVO Section – ...................... 25
5-3. Block Diagram  – MAIN Section – ................................ 26
5-4. Block Diagram

– DISPLAY/BUS CONTROL Section – ........................ 27

5-5. Block Diagram  – POWER SUPPLY Section – ............. 28
5-6. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 29

5-7. Printed Wiring Boards  – CD Section (1/2) – ................ 30
5-8. Printed Wiring Board  – CD Section (2/2) – .................. 31
5-9. Schematic Diagram  – CD Section – .............................. 32
5-10. Printed Wiring Boards  – MD Section – ......................... 33
5-11. Schematic Diagram  – MD Section (1/2) – .................... 34
5-12. Schematic Diagram  – MD Section (2/2) – .................... 35
5-13. Printed Wiring Boards

– MAIN Board (Component Side) – .............................. 36

5-14. Printed Wiring Board

– MAIN Board (Conductor Side) – ................................ 37

5-15. Schematic Diagram – MAIN Board (1/4) – ................... 38
5-16. Schematic Diagram – MAIN Board (2/4) – ................... 39
5-17. Schematic Diagram – MAIN Board (3/4) – ................... 40
5-18. Schematic Diagram – MAIN Board (4/4) – ................... 41
5-19. Printed Wiring Board

– DISPLAY Board (Component Side) – ........................ 42

5-20. Printed Wiring Boards

– DISPLAY Board (Conductor Side) – .......................... 43

5-21. Schematic Diagram – DISPLAY Board (1/2) – ............. 44
5-22. Schematic Diagram – DISPLAY Board (2/2) – ............. 45
5-23. Printed Wiring Board

– KEY Board (Component Side) – ................................. 46

5-24. Printed Wiring Board

– KEY Board (Conductor Side) – ................................... 47

5-25. Schematic Diagram  – KEY Board – ............................. 48
5-26. Schematic Diagram  – SUB/POWER Boards – ............. 49
5-27. Printed Wiring Board

– POWER Board (Component Side) – ........................... 50

5-28. Printed Wiring Boards  – POWER Board

(Conductor Side)/SUB Board – ...................................... 51

5-29. IC Pin Function Description ........................................... 63

6-1. MAIN Section ................................................................. 78
6-2. SUB Panel SUB Assy Section ........................................ 79
6-3. Front Panel Section ......................................................... 80
6-4. Front Panel SUB Section ................................................ 81
6-5. DISPLAY Board Section ................................................ 82
6-6. Chassis (T) Assy Section ................................................ 83
6-7. Chassis (B) Assy Section-1 ............................................. 84
6-8. Chassis (B) Assy Section-2 ............................................. 85
6-9. MD Mechanism Deck Section-1 (MG-164MF-138) ..... 86
6-10. MD Mechanism Deck Section-2 (MG-164MF-138) ..... 87
6-11. MD Mechanism Deck Section-3 (MG-164MF-138) ..... 88
6-12. CD Mechanism Deck Section-1 (MG-398D-121) ......... 89
6-13. CD Mechanism Deck Section-2 (MG-398D-121) ......... 90
6-14. CD Mechanism Deck Section-3 (MG-398D-121) ......... 91

............................... 92

4

This set can playback a CD-R, CD-RW for audio use.
When test this set, use the following test disc.
Test disc for CD-R: TCD-R082LMT (Part No.: J-2502-063-1)
Test disc for CD-RW: TCD-W082L (Part No.: J-2502-063-2)

Don't apply impossible power, but open and close slowly with both hands.

front panel section

extension cable (main board-power board)
(J-2502-067-1)

extension cable (main board-servo (CD) board)
(J-2502-062-1)

When repairing this set, etc., connect the extension cable as the figure shown below.

5

This section is extracted from
instruction manual.

a

b

c

(1)

(2)

To store stations/receive stored stations.

d

e

To display the menus.

f

To select the source.

g

<

,

To skip tracks/fast-forward, reverse a track/
tune in stations automatically, find a station 
manually/select a setting.

h

i

j

To turn up or down the volume.

k

l

To change the operation.

m

n

o

M

m

To receive preset stations/change the disc*/
select an item in Menu.

*

p

To enter a setting.

q

(SEEK)

<

to select 
leftwards

 

(DISC)

M

to select upwards

v

(DISC)

m

to select downwards

 (SEEK)

,

to select 
rightwards

Note
If the unit is turned off by pressing 

(OFF)

(SOURCE)

Tip
Refer to “Replacing the lithium battery” for details on 
how to replace the batteries.

6

a

b

c

d

e

f

g

h

i

j

k

(located on the 

bottom of the unit)
See “Frequency select switch” in the 
Installation/Connections manual.

l

m

. m

M >

AMS (. m/M >) buttons share 
the same functions as SEEK (</,) 
buttons on the card remote commander. 

n

*

*

Warning when installing in a car without 
an ACC (accessory) position on the 
ignition switch
After turning off the ignition switch, be sure to 
press 

(OFF)

 on the unit for 2 seconds to turn 

off the clock display.

Otherwise, the clock display does not turn off 
and this causes battery drain.

OFF

WX-7700MDX