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– 5 –

4-216-349-0

π US model

4-216-349-1

π Canadian model

4-216-349-2

π AEP, UK model

4-216-349-3

π Australian model

4-216-349-4

π Singapore model

4-216-349-5

π Hong Kong model

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.

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)

.......................................................... 6

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

3-1. Case and Front Panel .......................................................... 12
3-2. Slider (Cam) ........................................................................ 12
3-3. Base Unit (MBU-5A) and BD Board .................................. 13
3-4. SW Board and Loading Motor (M103) .............................. 13

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

............................... 19

6-1. Circuit Boards Location ...................................................... 28
6-2. Block Diagrams

• BD Section ....................................................................... 29
• Main Section .................................................................... 31

6-3. Printed Wiring Board – BD Section – ................................. 35
6-4. Schematic Diagram – BD Section – (1/2) ........................... 37

Schematic Diagram – BD Section – (2/2) ........................... 39

6-5. Schematic Diagram – Main Section – (1/2) ........................ 41

Schematic Diagram – Main Section – (2/2) ........................ 43

6-6. Printed Wiring Board – Main Section – .............................. 45
6-7. Printed Wiring Board – Panel Section – ............................. 47
6-8. Schematic Diagram – Panel Section – ................................ 49
6-9. Schematic Diagram – BD Switch Section – ....................... 51
6-10. Printed Wiring Board – BD Switch Section – .................. 51
6-11. IC Block Diagrams ........................................................... 52
6-12. IC Pin Functions ............................................................... 55

7-1. Case and Back Panel Section .............................................. 61
7-2. Front Panel Section ............................................................. 62
7-3. Mechanism Section (MDM-5A) ......................................... 63
7-4. Base Unit Section (MBU-5A) ............................................. 64

........................................ 65

0.15

µ

F

To Exposed Metal
Parts on Set

1.5k

Ω

AC
voltmeter
(0.75V)

Earth Ground

Parts No.

– 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. Rotate the  AMS  knob to display “[Service]”, and press the  YES  button.
3. Rotate the  AMS  knob to display “lop.Write”, 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 : Rotate 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. Rotate the  AMS  knob to display “[Service]”, and press the  YES  button.
3. Rotate the  AMS  knob to display “lop.Read”.
4. “@@.@/##.#” is displayed and the recorded contents are displayed.

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

: indicates the Iop value after adjustment

5. To end, press the  AMS  button or  MENU/NO  button to display “Iop Read”. Then press the  REPEAT  button.

– 8 –

• 0.9 mW power

Specified value : 0.84 to 0.92 mW

• 7.0 mW power

Specified value : 6.8 to 7.2 mW
lop (at 7mW)

• Labeled on the optical pickup

Iop value ± 10mA

• Traverse waveform

Specified value : Below 10% offset

• Error rate check

Specified value : For points a, b, and c
C1 error : Below 220
AD error : Below 2

• Error rate check

Specified value:
a. When using test disc (MDW-74/AU-1)

C1 error : Below 80
AD error : Below 2

b.When using check disc (TDYS-1)

C1 error : Below 50

• CPLAY error rate check

Specified value:
C1 error : Below 80
AD error : Below 2

• Unsatisfactory if displayed as T=@@ (##) [NG]”

NG
(@@, ## are both arbitrary numbers)

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.

Laser power check
(5-6-2 : See page 21)

Traverse check
(5-6-3 : See page 21)
Focus bias check
(5-6-4 : See page 22)

C PLAY check
(5-6-5 : See page 22)

Self-recording/playback
check
(REC/PLAY)
(5-6-6 : See page 22)

TEMP check
(Temperature
compensation
offset check)
(5-6-1 : See page 21)

Criteria for Determination
(Unsatisfactory if specified value is not satisfied)

• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the

overwrite head

If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around D101

(BD board)

• Check the signals around IC101, IC121, CN102,

CN103 (BD board)

Measure if unsatisfactory:

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.

The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Procedure :
Remove the short-pin attached to CN406, and then attach it again.

CN406