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4-6. A 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-25 H. DRIVE) on the A Board.
3. Check H. Frequency for 15734 ± 400/-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-27 (V OUT) or CN501 pin 6
(V DY+) and ground on the A Board .
4. Check that V. Frequency shows 60 ± 5 Hz.
Subcontrast Adjustment (RDRV)
1. Input a color-bar signal and set the level to 75%.
2. Set in Standard mode.
3. Activate the Service Adjustment Mode. Set color min, pic max.
4. Set GON and BON items. Using 3 and 6 set each to the following
values. Leave RON set to "1".
Mode
Category
service
video
Signal
Type
ntsc
vchp
00000000 00000000
R ON: ON
(1)
G ON: OFF
(0)
B ON: OFF
(0)
5. Connect an oscilloscope probe to C Board, CN705 pin 3 (Red Out)
(TP35).
6. Select SCON with 1 and 4 .
7. Adjust the value of SCON with 3 and 6 for
1.95 ± 0.05Vpp.
8. After adjusting SCON, if still out of spec, use RDRV registor as a fi ne
adjustment.
9. Reset GON and BON values to "1".
R ON: ON
(1)
G ON: ON
(1)
B ON: ON
(1)
10. Press MUTING then ENTER to save into the memory.
KV-29FS105/34FS105/38FS105
Item
Display
Data
Item
rdrv
26
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with 1 and 4 .
4. Adjust values of DISP with 3 and 6 to adjust characters to the
center.
5. Press MUTING then ENTER to save into the memory.
6. Check to see if the text is displayed on the screen.
Mode
Category
service micro
Signal
Type
ntsc
vchp
00000000 00000000
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 1 and 4 .
5. Adjust the values of SBRT with 3 and 6 to obtain a faintly visible
crosshatch.
6. Press MUTING then ENTER to save into the memory.
KV-29FS105/34FS105/38FS105
Display
Item
Item
Data
disp
48
25
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