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9

3

screw 
(BVTP3 

×

 8)

5

3

screw
(BVTP3 

×

 8)

4

eight screws
(BVTP3 

×

 8 TYPE 2 IT-3)

2

two screws 
(BVTP3 

×

 8)

2

two screws 
(BVTP3 

×

 8)

1

connector
(CN803)

1

connector
(CN802)

1

connector
(CN805)

1

connector
(CN804)

8

two screws
(BVTP3 

×

 8)

9

MAIN board

7

twelve screws
(transistor)

6

connector
(CN810)

6

six connectors
(CN501, 551, 451, 401, 601, 651)

10

All preset contents are reset to the default setting.
Procedure:
While pressing the 

[SET UP]

 and 

[DIMMER]

 buttons, press the

?/1

button to turn on the main power. The message “TUNER

FACTORY PRESET” appears and the present contents are reset
to the default values.

All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
Procedure:
While pressing the 

[A.F.D.]

 and 

[SOUND FIELD MODE]

 buttons,

press the

?/1

button to turn on the main power. The message

“MEMORY CLEAREDd” appears and the memories are reset to
the default values.

The preset sound field is cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
Procedure:
While pressing the 

[SOUND FIELD MODE]

 button, press the

?/1

button to turn on the main power. The message “S.F

Initialize” appears and initialization is performed.

All fluorescent segments are tested. When this test is activated, all
segments turn on at the same time, then each segment turns on one
after another.
Procedure:
1. While pressing the 

[A.F.D.]

 and 

[DIMMER]

 buttons, press

the

?/1

button to turn on the main power.

2. All segments turn on at the same time, then each segment turns

on press the 

[A.F.D.]

 button.

Procedure:
While pressing the 

[SET UP]

 button simultaneously, press the

?/1

 button to turn on the main power. The set enters the DEMO

mode.
Wait a while, then the demonstration starts. If the

?/1

button is

pressed often the demonstration has started, the power is turned
off, and the demonstration resumes if the

?/1

button is pressed

again.

Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
Procedure:
1. Set the FUNCTION to AM. Press the

?/1

button to turn off

the main power.

2. While depressing the 

[PRESET TUNING +]

 button, press the

?/1

button to turn on the main power.

3. Either the message “AM 9kHz Step” or “AM 10kHz Step”

appears. Select the desired step.

When this mode is used, the microprocessor version number is
displayed.
Procedure:
Press three buttons of 

[SHIFT]

, 

[SOUND FIELD MODE]

 and

[TUNING --]

 simultaneously. The microprocessor version number

appears.

This test is conducted to check if the DSP functions normally.
Procedure:
1. While pressing the 

[DISPLAY]

and 

[TUNING +]

 buttons, press

the

/1

button to turn on the main power.

2. If the DSP is normal, the message “RWS 1:000 2:000 SYNC”

appears.

3. If the DSP is abnormal, characters other than 0 appears at the

000 part of the message.

RWS characters of the message correspond to the digits of 000.
RW means read/write from the system controller (IC1703) to the
DSP, and S means the communication between DSP and S-RAM
(IC1502, IC1602). For example, if the writing of the system
controller failed, 0*0 (* is a character other than 0) appears. Also,
1 and 2 indicates DSP1 (IC1501) and DSP2 (IC1601), and 1:000
and 2:000 show the test results of DSP1 and DSP2 respectively.

11

Procedure:
1. Short the CN306 pin 4 on the VIDEO board to the GND.
2. Connect a frequency counter to the CN306 pin 2 on the

VIDEO board.

3. Press the 

/1

button to turn on the main power.

4. Press the 

[SET UP]

 button.

5. Press the 

[<]

 or 

[>]

 button to display “OSD H.POSITION”.

8. Adjust the CT302 so that the frequency counter reading is

3.57954 MHz.

9. Press the 

/1

button to turn off the main power.

10. Connect a frequency counter to the CN306 pin 1 on the

VIDEO board.

11. Press the 

/1

button to turn on the main power.

12. Press the 

[SET UP]

 button.

13. Press the 

[>]

 button to display “OSD V.POSITION”.

14. Adjust the CT303 so that the frequency counter reading is 7.20

MHz.

VIDEO board

CN306 pin 

1

 or pin 

2

+
–

frequency counter

IC304

IC310

CT303

CT302

CN306

1

4

12

MEMO