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5-30

Adjust the LPF of the playback RF amplifier.

Mode

Standby

Subject

Arbitrary

Measurement Point

Pin 

9 of CN152 (RF AGC OUT)

Measuring Instrument

Oscilloscope

Adjustment Page

F

Adjustment Address

4E

Specified Value

14.2 MHz signal level is minimum

Connection:
1)

Input a 14.2 MHz, 400mVp-p CW signal to Pin 

7 of CN152

(RF AGC IN).

Fig. 5-2-5.

Adjusting method for NTSC model:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 10, set data: 02, and press the PAUSE
button of the adjustment remote commander.

3)

Select page: 3, address: 01, set data: 35, and press the PAUSE
button.

4)

Select page: F, address: 4E, change the data and minimize the
14.2 MHz signal level (A).
(The data of address: 4E should be the maximum value which
satisfied the specified value.)

5)

Press the PAUSE button.

6)

Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjustment remote commander.

7)

Select page: D, address: 10, set data: 00, and press the PAUSE
button.

8)

Select page: 0, address: 01, and set data: 00.

Adjusting method for PAL model:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 10, set data: 02, and press the PAUSE
button of the adjustment remote commander.

3)

Select page: 3, address: 01, set data: 35, and press the PAUSE
button.

4)

Select page: F, address: 4E, change the data and minimize the
14.2 MHz signal level (A).
(The data of address: 4E should be the maximum value which
satisfied the specified value.)

5)

Press the PAUSE button.

6)

Select page: F, address: 4E, and read the data (D

1

).

7)

Convert D

1

 to decimal notation, and obtain D

1

'. (Refer to Table

5-3-1. “Hexadecimal-decimal conversion table” of “5-3. Service
mode”. )

8)

Calculate D

2

' using following equations (decimal calculation).

D

2

' = D

1

'-30

9)

Convert D

2

' to a hexadecimal number and obtain D

2

.

10) Select page: F, address: 4E, set data: D

2

, and press the PAUSE

button.

11) Select page: 3, address: 01, set data: 00, and press the PAUSE

button of the adjustment remote commander.

12) Select page: D, address: 10, set data: 00, and press the PAUSE

button.

13) Select page: 0, address: 01, and set data: 00.

Fig. 5-2-6.

Signal 
generator

14.2MHz 400mVp-p

0.01

µ

F

0.01

µ

F

47

Ω

15k

Ω

3.3k

Ω

Pin 

3

 of LANC jack  

(5.5Vdc)

Pin 

7

 of CN152

(RF AGC IN)

Pin 

8

 of CN152

(REG GND)

Transistor : General NPN transistor (2SC403. etc)
47 

Ω

 resistor :

1-249-401-11

3.3 k

Ω

 resistor :

1-249-423-11

15 k

Ω

 resistor :

1-249-431-11

0.01

µ

F capacitor :

1-101-004-00

A

14.2MHz

5-31

Adjust the Y FM signal recording current.

Mode

Standby

Subject

Arbitrary

Measurement Point

Pin 

5 of CN152 (REC RF)

Measuring Instrument

Oscilloscope
(20 MHz BW LIMIT: OFF)

Adjustment Page

F

Adjustment Address

55

Specified Value

A=170 ± 5mV (NTSC)
A=170 ± 5mV (PAL)

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 10, set data: 02, and press the PAUSE
button of the adjustment remote commander.

3)

Select page: 3, address: 01, set data: 43, and press the PAUSE
button.

4)

Select page: F, address: 60, after note down the data , set data:
00, and press the PAUSE button.

5)

Select page: F, address: 55, change the data and set the Y signal
level (A) to the specified value.

6)

Press the PAUSE button.

7)

Select page: F, address: 60, set the data noted down at step 4),
and press the PAUSE button.

8)

Select page: 3, address: 01, set data: 00, and press the PAUSE
button.

9)

Select page: D, address: 10, set data: 00, and press the PAUSE
button.

10) Select page: 0, address: 01, and set data: 00.

Fig. 5-2-7.

Set the recording levels of the REC AFM signal and REC ATF signal.
If the level is too low, the audio S/N will deteriorated, tracking will
not be stable, If too high, color beats will be produced on the self-
recording / playback image.

Mode

Standby

Subject

Arbitrary

Measurement Point

Pin 

5 of CN152 (REC RF)

Measuring Instrument

Oscilloscope

Adjustment Page

F

Adjustment Address

60, 5F

Specified Value

A=8.0 ± 0.6mV (NTSC)
A=7.5 ± 0.6mV (PAL)

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 10, set data: 02, and press the PAUSE
button of the adjustment remote commander.

3)

Select page: 2, address: 61, and set data: 30.

4)

Select page: 3, address: 01, set data: 43, and press the PAUSE
button.

5)

Select page: F, address: 55, after note down the data , set data:
00, and press the PAUSE button.

6)

Select page: F, address: 65, set data: 00, and press the PAUSE
button.

7)

Select page: F, address: 60, change the data and set the REC
AFM signal level (A) to the specified value.

8)

Press the PAUSE button.

9)

Select page: F, address: 5F, set the same data as page: F, address:
60 and press the PAUSE button of the adjustment remote
commander.

10) Select page: F, address: 55, set the data noted down at step 5),

and press the PAUSE button.

11) Select page: 3, address: 01, set data: 00, and press the PAUSE

button.

12) Select page: 2, address: 61, and set data: 00.
13) Select page: D, address: 10, set data: 00, and press the PAUSE

button.

14) Select page: 0, address: 01, and set data: 00.
15) Perform “REC C Current Adjustment”.

Fig. 5-2-8.

A

0.2 

µ

sec

Center of the luminance width

Center of the luminance width

A

0.67

µ

sec

Center of the luminance line width

Center of the luminance line width

5-32

Set the recording current levels of the REC Chroma signal. If it is
too low, chroma signal noise in played back picture will increased.
If too high, Y signal noise will increase and white modulation noise
will be produced.

Mode

Standby

Subject

Arbitrary

Measurement Point

Pin 

5 of CN152 (REC RF)

Measuring Instrument

Oscilloscope

Adjustment Page

F

Adjustment Address

65

Specified Value

A=30.9 ± 1.0mV (NTSC)
A=27.6 ± 1.0mV (PAL)

Connection:
1)

Disconnect CN151 of VC-205 board.

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 10, set data: 02, and press the PAUSE
button of the adjustment remote commander.

3)

Select page: 2, address: 61, and set data: 30.

4)

Select page: 3, address: 01, set data: 43, and press the PAUSE
button.

5)

Select page: F, address: 55, after note down the data , set data:
00, and press the PAUSE button.

6)

Select page: F, address: 65, change the data and set the REC
chroma signal level (A) to the specified value.

7)

Press the PAUSE button.

8)

Select page: F, address: 55, set the data noted down at step 5),
and press the PAUSE button.

9)

Select page: 3, address: 01, set data: 00, and press the PAUSE
button.

10) Select page: 2, address: 61, and set data: 00.
11) Select page: D, address: 10, set data: 00, and press the PAUSE

button.

12) Select page: 0, address: 01, and set data: 00.

Fig. 5-2-9.

A

1.35 

µ

sec

5-33

Fig. 5-2-10.

Audio oscillator

Attenuator

600 

Ω

600 

Ω

: 270 

Ω

 (1-249-410-11) + 330 

Ω

 (1-249-411-11)

Main unit

AUDIO/

VIDEO

AUDIO INPUT (Red)

AUDIO OUTPUT (White) 

47k 

Ω

Video (Yellow)

TV monitor

Audio level meter

or Distortion meter

47k 

Ω

 (1-249-437-11)

Main unit

AUDIO/

VIDEO

AUDIO INPUT (Red)

AUDIO OUTPUT (White) 

47k 

Ω

Video (Yellow)

TV monitor

Audio level meter

or Distortion meter

47k 

Ω

 (1-249-437-11)

Connect the audio system measuring instruments as shown in Fig.
5-2-10.

Before adjusting the audio system, prepare a video cartridge which
is recorded 400Hz, –7.5dBs audio signal.

To record the audio signal on a video cartridge, use another main
unit which is adjusted correctly.

Recording method:
1)

Install a video cartridge.

2)

Connect the adjustment remote commander.

3)

Select page: 3, address: 01, set data: 73 and press the PAUSE
button of the adjustment remote commander.

4)

Input the 400Hz, –7.5dBs signal in the audio input terminal of
AUDIO VIDEO jack.

5)

Press the START/STOP button and set to camera recording
mode.

6)

Record the signal for a few minutes.

After completing recording, select page: 3, address: 01, set data:
00, and press the PAUSE button of the adjustment remote
commander.