DOWNLOAD Sony CMT-EX200 / HCD-EX200 Service Manual ↓ Size: 3.13 MB | Pages: 45 in PDF or view online for FREE

2

After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.

LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM

or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)

µF

Ω

! OR DOTTED LINE

! ON THE SCHEMATIC DIAGRAMS AND IN

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

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.

Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C

during 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.

! SUR

3

The laser diode in the optical pick-up block may suffer electrostatic
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 flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output four times.

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

.......................................................................... 7

3-1. Rear Cover, Bottom Plate, Case and Eject Board ................. 9
3-2. Panel Board and Stabilizer .................................................. 10
3-3. AMP Block ......................................................................... 10
3-4. CD Block ............................................................................ 11
3-5. Motor Assy (Loading Board), CAM and SW Board .......... 11
3-6. Base Unit and Pick Up Assy ............................................... 12
3-7. Main Board (Loading Board),
        REG Board and Power Board ............................................. 12

................................... 13

5-1. Circuit Boards Location ...................................................... 14
5-2. Block diagrams – Tuner/CD Section – ............................... 16

Block diagrams – AMP Section – ....................................... 17

5-3. Printed Wiring Board – Main Section – .............................. 18
5-4. Schematic Diagram – Main (1/3) Section – ........................ 19
5-5. Schematic Diagram – Main (2/3) Section – ........................ 20
5-6. Schematic Diagram – Main (3/3) Section – ........................ 21
5-7. Printed Wiring Board – LED/Loading/SW/AMP Section – 22
5-8. Schematic Diagram

– LED/Loading/SW/AMP Section Section – ...................... 23

5-9. Printed Wiring Board – Panel/Eject Section – .................... 24
5-10. Schematic Diagram – Panel/Eject Section – ..................... 25
5-11. Printed Wiring Board – REG Section – ............................ 26
5-12. Schematic Diagram – REG Section – .............................. 27
5-13. Printed Wiring Board – Power Section – ......................... 28
5-14. Printed Wiring Board – Power Section – ......................... 29
5-15. IC Pin Functions ............................................................... 30
5-16. IC Block Diagrams ........................................................... 33

6-1. Front and Case Section ....................................................... 36
6-2. Chassis Section ................................................................... 37
6-3. Mechanism Section ............................................................. 38

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

39

4

Note : Set the slider (1) in this location 
before inserting the cam.

5

Shipment Mode
• Mode for setting the state of the unit to the state at shipment. When returning the unit to the customer after completing servicing, set to the

shipment mode.

Procedure :
Connect the power plug to the outlet while pressing the  

1/u  button.

Change-over of AM tuner Step between 9kHz and 10kHz.
• A step of AM channels can be changed over between 9kHz and 10kHz.

Procedure:
1. Press the  

1/u  button to turn on the set ON.

2. Select the function “TUNER”, and press the  TUNER/BAND  button to select the BAND “AM”.
3. Press the  

1/u  button to turn on the set OFF.

4. Press the  

1/u  button while pressing the  )+/TUNING +  button, and the display of liquid crystal indicator tube changes to “AM 9k

STEP” or “AM 10k STEP”, and thus the channel step is changed over.

Switching the TAPE IN input level attenuate function ON/OFF
• The attenuate function of the line input level (TAPE IN) of this unit can be turned ON/OFF.

Procedure:
1. Press the  

1/u  button to turn ON the power.

2. Press the  FUNCTION  button and set the function to “TAPE”.
3. Press the  

1/u  button to turn OFF the power.

4. While pressing the  

p  button, press the  1/u  button to turn ON the power.

5. After “POWER ON” is displayed, “ATT ON” and “ATT OFF” are displayed, and the attenuate function can be switched ON/OFF.

Procedure:
1. While pressing the  FUNCTION  button and  

^  button, connect the power plug to the outlet.

2. When the test mode is set, the characters “STEP” are displayed on the LCD.
3. While pressing the  DISPLAY  button (See page 6), press the  

^  button. The whole LCD lights up.

4. Each time the  FUNCTION  button is pressed, the display switches between all lit 

n partial lighting 1 n partial lighting 2 n all lit.

5. When the  

p  button is pressed, “KEY 0” is displayed and the key check mode is set.

6. Each time the button is pressed, the counter counts up. Buttons once pressed will not be counted when pressed again.

When all buttons have been pressed, “KEY OK” is displayed.

7. To end, press the  

1/u  button to turn OFF the power, and disconnect the power plug from the outlet.

Note:
Pressing buttons other than those specified in steps 4 and 5 displays modes not used in servicing. In such cases, press the  

1/u  button to exit

the mode, and repeat from step 3 again.