Toshiba 14AR22, Service Manual

11

14AR22

Ë

SERVICE ADJUSTMENT

RF AGC Adjustment

1. Receive a good local channel.
2. Enter the service mode signal category and select

the service adjustment "AGC".

3. Set the data value to point where no noise or beat

appears.

4. Select another channel to confirm that no noise or

beat appears.

HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT

No. Adjusting point

Adjusting procedure/conditions

Waveform and others

V-SLOPE(I

2

C

BUS CON-
TROL)

V-CENTER (I

2

C

BUS CON-
TROL)

V - AMP (I

2

C

BUS CON-
TROL)

S-CORREC-
TION

(I

2

C

BUS CON-
TROL)
H - CENTER

1. Receive Monoscope Pattern Signal.
2. Call the "V-LIN" mode.
3. Increase or decrease "V-LIN" by Volume key till

the horizontal line in the center of monoscope is
just at the position where the blanking starts.

1. Call the "V-CENT" mode.
2. Increase or decrease "V-CENT" by Volume key till

the picture is centered.

1. Call the "V-AMP" mode.
2. Increase or decrease "V - AMP" by Volume key to

set overscan of 10.0% typical.
Adjustment Spec 10.0%  range 

±

1%.

FIXED DATA, NO NEED TO ADJUST.

1. Call the "H-CENT" mode.
2. Increase or decrease "H-CENT" by Volume key

to center the picture horizontal.

1

2

3

4

5

Focus
adjustment

1. Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
3. Adjust the focus control to get the best focus.

6

No. Adjusting point

Adjusting procedure/conditions

Waveform and others

SUB-TINT (I

2

C

BUS CON-
TROL)

1. Receive the "Colour Bar" signal through AV in.
2. Connect the oscilloscope to TP853 (Pin (5) of

P882) BLUE-OUT.

»

Range

: 100mV/div. (AC)(Use Probe 10:1)

»

Sweep time : 10 

µ

sec/div.

3. Call the "SUB-TINT" mode in service mode. Ad-

just the "SUB-TINT" bus data to obtain the wave-
form shown as Fig 1.

4. "SUB-TINT" bus data decrease 4 steps to get final

waveform. (Fig 2.)

5. Clear the SERVICE mode.

1

CHROMA ADJUSTMENT

FINAL WAVEFORM

Fig 2

 WAVEFORM 1

Y CY G MG R B

W

SAME LEVEL

Fig 1