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KV-29FS12K
4-4. MA BOARD ADJUSTMENTS
H. Frequency (Free Run) Check
1. Input a TV mode (RF) with no signal.
2. Connect a frequency counter to base of Q501
(TP-500 H. DRIVE) on the A Board.
3. Check H. Frequency for 15735 ± 200 Hz .
V. Frequency (Free Run) Check
1. Select video 1 with no signal input.
2. Set the conditions for a standard setting.
3. Connect the frequency counter to TP-508 (V OUT) or
CN501 pin
(V DY+) and ground on the A Board .
4. Check that V. Frequency shows 60 ± 4 Hz.
Drive (RDRV)
1. Input a color-bar signal and set the level to 75%.
2. Set in Standard mode.
3. Activate the Service Adjustment Mode.
4. Set both GON and BON items. Using
the following values. Leave RON set to "1".
Mode
service
Signal
Type
ntsc
vchp
R ON:
ON (1)
G ON:
OFF (0)
B ON:
OFF (0)
5. Connect an oscilloscope probe to CA Board, J701 Pin 12
(KR) (Red Out) .
6. Select RDRV with
and
7. Adjust the value of RDRV with
92.5 ± 3 VDC.
8. Reset GON and BON values to "1".
R ON:
ON (1)
G ON:
ON (1)
B ON:
ON (1)
9. Press
then
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with
and
and
; set each to
Item
Display
Data
Category
Item
video
rdrv
26
000000000 00000000
.
and
for
to save into the memory.
.
4. Adjust values of DISP with
to the center.
5. Write to memory by pressing
6. Check to see if the text is displayed on the screen.
Mode
Signal
Type
Sub Bright Adjustment (SBRT)
1. Input a monoscope signal.
2. Activate the Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Select the SBRT item with
5. Adjust the values of SBRT with
visible crosshatch.
6. Press
then
Sub Hue, Sub Color Adjustment (CHUE, CCOL)
1. Input a color-bar signal.
2. Activate the Service Adjustment Mode.
3. Connect an oscilloscope probe to CA Board, CN705
Pin
Blue Out.
4. Select the CHUE and CCOL item with
5. While showing the CHUE item, adjust the waveform with
and
until the second and third bars show the same level
(V2 = V3 < 0.1 Vp-p).
6. While showing the CCOL item, adjust the waveform with
and
until the first and fourth bars show the same level
(V1 = V4 < 0.1 Vp-p).
7. Press
then
V. Size Adjustment (VSIZ)
1. Input a crosshatch signal.
2. Activate the Service Adjustment Mode.
3. Select the VSIZ item with
4. Adjust value of VPOS with
center.
5. Press
then
— 20 —
and
to adjust characters
then
Display
Item
Category
Item
Data
service micro
disp
48
ntsc
vchp
00000000 00000000
and
.
and
to obtain a faintly
to save into the memory.
and
.
8
8
8!
8"
to save into the memory.
and
.
and
for the best vertical
to save into the memory.
.
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