— 26 —
KV-34FS12T
5-4. 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
CN501pin
(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. In Standard mode, set PICTURE to maximum and COLOR
to minimum.
3. Activate the Service Adjustment Mode.
4. Set both GON and BON items. Using
and
; set each to
the following values. Leave RON set to “1”.
service video rdrv
26
ntsc
vchp
Category
Display
Item
Mode
Item
Data
Signal
Type
8(0) 8(0)
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
and
for
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. Reset Picture and Color to normal values:
PICTURE:
MAX
COLOR:
CENTER
10. Press
then
to save into the memory.
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with
and
.
4. Adjust values of DISP with
and
to adjust characters
to the center.
5. Write to memory by pressing
then
.
6. Check to see if the text is displayed on the screen.
service micro disp
48
ntsc
vchp
Category
Display
Item
Mode
Item
Data
Signal
Type
8(0) 8(0)
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
and
.
5. Adjust the values of SBRT with
and
to obtain a faintly
visible crosshatch.
6. Press
then
to save into the memory.
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
.
4. Select the CHUE and CCOL item with
and
.
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).
V1
V2 V3 V4
7. Press
then
to save into the memory.
V. Size Adjustment (VSIZ)
1. Input a crosshatch signal.
2. Activate the Service Adjustment Mode.
3. Select the VSIZ item with
and
.
4. Adjust value of VPOS with
and
for the best vertical
center.
5. Press
then
to save into the memory.
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