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2

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4

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

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.............................................................. 16

......................... 21

6-1. IC Pin Function Description ........................................... 30
6-2. Block Diagram – SERVO Section – ............................... 37
6-3. Block Diagram – MAIN Section – ................................. 39
6-4. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 42

6-5. Printed Wiring Board  – BD Board – ............................. 43
6-6. Schematic Diagram – BD Board (1/2) – ........................ 45
6-7. Schematic Diagram – BD Board (2/2) – ........................ 47
6-8. Schematic Diagram – SW Board – ................................. 49
6-9. Printed Wiring Board – SW Board – .............................. 49
6-10. Printed Wiring Boards – TRANS Board – ..................... 53
6-11. Printed Wiring Board – MAIN Board – ......................... 55
6-12. Schematic Diagram – MAIN Board (1/2) – ................... 57
6-13. Schematic Diagram

– MAIN Board (2/2), TRANS Board – .......................... 59

6-14. Printed Wiring Boards – PANEL/PANEL 2 Boards – ... 61
6-15. Schematic Diagram – PANEL/PANEL 2 Boards – ........ 63

................................................ 66

............................... 70

After correcting the original service problem, perform the follow-
ing safety check 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.

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).
Leakage 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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

— BACK PANEL —

Part No.

MODEL

Part No.

US model

4-216-840-0

π

Canadian model

4-216-840-1

π

Singapore model

4-216-840-2

π

AEP model

4-216-840-3

π

UK model

4-216-840-4

π

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• 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.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

Eksplosjonsfare ved feilaktig skifte av batteri.

Benytt samme batteritype eller en tilsvarende type

anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens

instruksjoner.

Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som
 rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande föreskrifter.

Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri

af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer’s instructions.

CAUTION

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

Laser component in this product is capable of emitting radia-
tion exceeding the limit for Class 1.

This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on
the rear exterior.

This caution
label is located
inside the unit.

!

!

!

– 6 –

The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.

GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
TEO : TRK error signal (Traverse adjustment)
VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

RF
VC
TEO

for MDM-3

for MDM-5

IOP
I+3V

VC
RF
TEO
IOP
I+3V
GND

VC

RF

TEO

IOP

I+3V

GND

1

5

1

6

CN110

RF

5P Connector

6P connector

VC

TEO

IOP

I+3V

GND

Mechanism deck

– 7 –

The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC171 of BD board),
record the IOP value on the optical pick-up according to the following procedure.

Record Precedure:
1. While pressing the  

= 

AMS

 

+ knob and p button, connect the power plug to the outlet, and release the  = 

AMS

 

+ knob

and

p button.

2. Turn the  

= 

AMS

 

+ knob to display “[Service]”, and press the 

[YES]

 button.

3. Turn the  

= 

AMS

 

+ knob to display “lop Write” (C28), and press the 

[YES]

 button.

4. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
5. Input the IOP value written on the optical pick-up.

To select the number : Turn the  

= 

AMS

 

+ knob.

To select the digit

: Press the  

= 

AMS

 

+ knob.

6. When the 

[YES]

 button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the 

[YES]

 button.

8. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop

Write”.

9. Press the 

[REPEAT]

 button to complete.

Display Precedure:
1. While pressing the  

= 

AMS

 

+ knob and  p  button, connect the power plug to the outlet, and release the  = 

AMS

 

+ knob

and  

p  button.

2. Turn th  

= 

AMS

 

+ knob to display “[Service]”, and press the 

[YES]

 button.

3. Turn the  

= 

AMS

 

+ knob to display “lop Read” (C27).

4. “@@.@/##.#” is displayed and the recorded contents are displayed.

@@.@ : indicates the IOP value labeled on the optical pick-up.
##.#

: indicates the IOP value after adjustment

5. To end, press the  

= 

AMS

 

+ knod or 

[MENU/NO]

 button to display “Iop Read”. Then press the 

[REPEAT]

 button.