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2007K04-1

© 

2007.11

Model Name Using Similar Mechanism

NEW

CD Drive Mechanism Type

MG-101TC-188//Q

Optical Pick-up Name

DAX-25A

•  The tuner and CD sections have no adjustments.

Signal-to-noise ratio: 95 dB
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit

FM
Tuning range:
  87.5 – 108.0 MHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Usable sensitivity: 9 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 
  67 dB (stereo), 69 dB (mono)
Harmonic distortion at 1 kHz: 
  0.5 % (stereo), 0.3 % (mono)
Separation: 35 dB at 1 kHz
Frequency response: 30 – 15,000 Hz

MW/LW
Tuning range:
  MW: 531 – 1,602 kHz
  LW: 153 – 279 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency:
  10.7 MHz/450 kHz
Sensitivity:
 MW: 

30 

μV, LW: 40 μV

Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 45 W × 4 (at 4 ohms)

Output:
  Power antenna (aerial) relay control terminal

Inputs:
  Antenna (aerial) input terminal
  AUX input jack (stereo mini jack)
Tone controls:
  Low: ±10 dB at 100 Hz
  High: ±10 dB at 10 kHz
Power requirements: 12 V DC car battery
  (negative ground (earth))
Dimensions: Approx. 178 × 50 × 179 mm
 (7

 1/8

 × 2 × 7

 1/8

 in.) (w/h/d)

Mounting dimensions: Approx. 182 × 53 × 162 
mm
 (7

 1/4

 × 2

 1/8

 × 6

 1/2

 in.) (w/h/d)

Mass: Approx. 1.2 kg (2 lb. 11 oz.)
Supplied accessories:
  Parts for installation and connections (1 set)

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.

The laser diode in the optical pick-up block may suffer electrostat-
ic break-down because of the potential difference generated by the 
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also 
use the procedure in the printed matter which is included in the 
repair parts.
The fl exible board is easily damaged and should be handled with 
care.

NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

CAUTION
Use of controls or adjustments or performance of procedures other than 
those specifi ed herein may result in hazardous radiation exposure.

If the optical pick-up block is defective, please replace the whole 
optical pick-up block.
Never turn the semi-fi xed resistor located at the side of optical 
pick-up block.

TEST  DISCS
Please use the following test discs for the check on the CD section.

 

YDES-18 (Part No. 3-702-101-01)

 

PATD-012 (Part No. 4-225-203-01)

0 OR  DOTTED  LINE  

0 ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

  .....................................................   4

 

Location of Controls .......................................................   5

 Connections 

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

5

3-1.   Sub Panel (LCD)

 Assy  ...................................................   8

3-2.   CD Mechanism Block .....................................................   8
3-3.   Main Board .....................................................................   9
3-4. Servo 

Board 

....................................................................   9

3-5. Chassis 

(T) 

Sub 

Assy 

......................................................  10

3-6.  Roller Arm Assy ..............................................................   10
3-7. Chassis 

(OP) 

Assy 

...........................................................  11

3-8. Chucking 

Arm 

Sub 

Assy 

.................................................  11

3-9. Sled 

Motor 

Assy 

..............................................................  12

3-10.  Optical Pick-up Section ..................................................   13
3-11. Optical Pick-up ...............................................................   13

DIAGNOSIS  FUNCTION 

 .....................................   14

5-1.  Block Diagram –Main Section– .....................................   17
5-2.  Block Diagram –Display Section– .................................   18
5-3.  Printed Wiring Board –Main Section– ............................   19
5-4.  Schematic Diagram –Main Section (1/3)– ......................   20
5-5.  Schematic Diagram –Main Section (2/3)– ......................   21
5-6.  Schematic Diagram –Main Section (3/3)– ......................   22
5-7.  Printed Wiring Board –Key Section– .............................   23
5-8.  Schematic Diagram –Key Section– ................................   24

6-1. Main 

Section 

...................................................................  29

6-2.  Front Panel Section .........................................................   30
6-3.  CD Mechanism Section (MG-101TC-188//Q) ...............   31

  ..............................   32

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution:  The printed pattern (copper foil) may peel away if the 

heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

• 

Usable with ordinary solder

 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

This compact disc player is classifi ed as a CLASS 1 LASER 

 

 

 

 

 

product. The CLASS 1 LASER PRODUCT label is located on the 
exterior.

This label is located on the bottom of the chassis.

You can play CD-DA (also containing CD TEXT) and CD-R/
CD-RW (MP3/WMA/ fi les).

CD-DA

MP3

WMA

EXTENSION  CABLE  AND  SERVICE  POSITION
When repairing or servicing this set, connect the jig (extension 
cable) as shown below.

•  Connect the MAIN board (CNP301) and the SERVO board 

(CN2) with the extension cable (Part No. J-2502-076-1).

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (A-1177-201-A) 
should be replaced since any parts in the SERVO board cannot be 
repaired.

NOTE FOR REPLACEMENT OF THE AUX JACK (J901)
To replace the AUX jack requires alignment.
1.  Insert the AUX jack into the KEY board.
2.  Place the KEY board on the front panel.
3.  Solder the three terminals of the jack.