Sharp SX76NF200, Service Manual

Page: 4 / 66

4
4-1 4-2
SX76NF200
E1
PIF ADJUSTMENT
NO
1
ADJUSTMENT POINT
RF-AGC
ADJUSTMENT
(I2C BUS CONTROL)
ADJUSTMENT CONDITION / PROCEDURE
(1) Receive "PAL COLOUR BAR" signal.
E-10cH
Signal strength: 54
±
1dB
µ
V (50 ohm open)
(2) Call "Auto AGC" mode in service mode (Additional
Setting).
(3) Push "Vol up" or "Vol down" key, automatically adjust.
*change indication from <STOP> to <CHECK> at start
adjustment.
when adjustment is finished, <CHECK> to <STOP>
WAVEFORM OR OTHERS
Note: For the 50 ohm signal strength
gauge, when not using 50/75 impedance
adapter, signal strength is 54
±
1dB
µ
V(50
ohm open), instead of 56
±
1dB
µ
V(75 ohm
open).
precaution: The loss of using impedance
adapter.
CUT OFF, BKGD ADJUSTMENT
NO
1
ADJUSTMENT POINT
AGING
ADJUSTMENT CONDITION / PROCEDURE
(1) Receive PR-0ch (BLUE BACK OFF), "NOISE PICTURE"
(2) Aging 30 minutes.
WAVEFORM OR OTHERS
1 CRT CUTOFF
ADJUSTMENT
Service mode I2C bus
data adjustment
(1) Receive E-5CH (Monoscope pattern).
(2) Select P-NORM with the remote controller.
(3) Turn on the service SW, and select "Tube Measurement
(1) mode.
(4) Select the screen VR 0/10.
(5) Press "-/--" key of the remote controller to select the
horizontal centering mode.
(6) Turn the screen VR in the opposite direction to the point
where the horizontal centering raster goes out.
Note1: Apply the adjustment after aging with the beam
current 1,600
±
50mA or more for 30 min or more.
(7) Press "-/--" key of the remote controller to select the
normal mode.
2 WHITE BALANCE
BACKGROUND
(CUT OFF BKGD)
I2C bus adjustment
(1) Receive E-5CH (Monoscope pattern).
(2) Select Picture-Normal with the remote controller.
(3) Receive the window pattern with AV input.
(4) With the data of G-drive and B-drive, adjust the colour
temperature 12300
°
K of the center white area.
(5) Adjust the right dark area of the window to 12300
°
K with
G-cut off and B-cut off.
(6) Readjust the colour temperature at the white peak.
(7) Check 12300
°
K at the low white.
Note 1:Apply this adjustment after aging with the beam
current 1,600
±
50mA or more for 30 min or more.
(On the white or green monocolor screen)
*The colour temperature is based on the shipment initial
setting table.
* The following item is carrying out simultaneously.
No. 2, 4, 5
• 12300
°
K X : 0.272
±
0.010
Y : 0.275
±
0.010
(With Minolta colour thermometer CA-100)
*Before doing the adjustment, make sure the
R/G/B-cut and the R/B/G-Drive is at initial
values.
R-CUT:300 R-DRIVE:400
G-CUT:300 G-DRIVE:400
B-CUT:300 B-DRIVE:400
On the monocolor screen of white or green.