Sharp CX51TXZ, Service Manual

Page: 9 / 47

9
9-1 9-2
CX51TXZ
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
(Continued)
No. Adjusting point Adjusting procedure/conditions Waveform and others
White balance
Service mode
adjustment
I
2
C bus
control
adjustment
1. Receive the “Monoscope Pattern” signal.
2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter between TP602 (–)
and TP603 (+).
4. Check Beam current should be around 1,100 µA.
5. Set it to service mode and adjust the “G-DRIVE”,
“B-DRIVE” data to have a colour temperature of
12,300°K.
6. When changed back to non-service mode, adjust
the Contrast & Brightness control to have a beam
current of 200µA. If the colour temperature is not
at 12,300°K go back to No. 1.
Note: This adjustment must be done after
warming up the unit for 30 minutes or
longer with a beam current over 700 µA.
2 Refer to Page 6.
* 12300°K
X : 0.272
Y : 0.275
(with colour temperature meter
CA-100 (MINOLTA).)
Note:
G-DRIVE UP “7” KEY
DOWN “F/B” KEY
B-DRIVE UP “8” KEY
DOWN “0” KEY
The data can be turned up
and down with the above
keys.
Maximum
beam check 1. Receive the “Monoscope Pattern” signal.
2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter between TP603 (+)
and TP602 (–).
(Full Scale: 3 mA Range)
4. Beam current must be within 1,100 ± 100 µA.
3
HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
V-AMP 50
V-LINEARITY-
50 Hz
V-S
CORRECTION-
50 Hz
V-SHIFT 50
(V-CENTER)
H-SHIFT (50)
(H-CENTER)
1. Adjust V-AMP50 to set overscan of 9.5% typical.
(“Monoscope Pattern” signal (50Hz))
Adjustment Spec 9.5% range +1% –0%.
1. Adjust V-LIN to have the best vertical linearity.
1. Pre-set, NO NEED adjust. (Only if can’t meet the
specification (±10%) of vertical linearity, then ad-
just V-SCORRECTION.)
1. Align the pattern’s center with the CRT mechani-
cal center.
1. Adjust H-SHIFT until left and right overscan is
same.
For V-AMP 60, V-LINEARITY 60, V-SCORRECTION
60, V-SHIFT 60 (Data Range “0”~“5”), H-SHIFT 60,
while 50 Hz mode has been adjusted automatically
data will be input.
* Please check the 60 Hz and re-adjust if there is
necessary to adjust. Please check also the PAL
60 Hz in dark condition wether left side of the
screen got blank or not and re-adjust when it hap-
pen.
1 ( ) Mean reception channel
Focus
adjustment 1. Receive the “Monoscope Pattern” signal.
2. Press R/C to set Picture NORMAL condition.
3. Adjust the focus control so that the screen be in
good focus.
2