Sharp 29H-FG3RU, Руководство по обслуживанию

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13
29H-FG3RU
13-1
13-2
PIF ADJUSTMENT
No.
Adjustment point
Adjustment condition/procedur
eW
aveform or remarks
RF-AGC T
AKE OVER
POINT AD- JUSTMENT (I
2
C BUS
CONTROL)
1
1.
Receive "P
AL
COLOR BAR" signal
.
Signal Strength: 54
±
1dB
µ
V
(75
ohm
termination)
2.
Connect the oscilloscope to
TP53 (T
uner's
AGC
Te
rminal) as shown in figure 3-1.
3.
Select "RF-AGC" item in the
Adjustment Mode.
Adjust the "RF-AGC" bus data to obtain the
T
uner
output pin drop 0.1V
~
1.0V below maximum volt-
age.
4.
Change the antenna input signal to 63 ~ 67dB
µ
V,
and make sure there is no noise.
5.
Set the RF
AGC to 0 - 6 V with no saturation with
the waveform.
6.
T
urn up the input signal to 90 ~ 95 dB
µ
V to
be
sure
that there is no cross modulation beat
.
Fig. 3
PURITY
ADJUSTMENT
No.
Adjustment point
Adjustment conditions/procedure
W
aveform or remarks
PURITY
ADJ.
1.
Select the green monocolor screen with remote contoller
, and set the beam current of 1.7mA
with the contrast control.
2.
Degauss the CR
T
enough with the degausing coil.
Note:
Follow the
job
instruction
manual
to
adjust the magnetic field.
.
3.
The purity magnet must be previously set at the 0 magnetic field, and the convergence must be adjusted to be rough. With P-MAG, adjust it to the center - rank
A.
4.
Observe the points a,b, as shown in Fig.1-1 through the microscope. Move DY fore and aft to set the landing at the point (Rank
A).
5.
If the a/b balance is poor
, compensate it to the
center "Rank
AB".
6.
Aline it to zero, keeping the raster rotation in th
e
east direction.
6.
T
ighten the deflection coil fastening screws.
»
Ti
ghtening torque : 108N
±
20N (1
1Kgf
±
2Kgf)
8.
Checking the CR
T
corner area, bond the mag-
netic sheet to set the landing at rank
A
for com-
pensation. Note:
Apply the adjustment after aging with the beam current 1700
±
50
µ
A or more
for 30 minutes or more.
Note:
Select the service mode, and press th
e
monocolor key of R/C for process, and the monocolor screen (green) will be selected.
1
a
b
A B A
90mm
90mm
B
A = B A = B
Fig.1-1
Fig. 1-2
Rank "A"
(on the right of the CR
T)
Fig. 1-3
Rank "A"
(on the left of the CR
T)
*
Continuosly press the mono- colour key 1 second or more, and the monocolour mode will be selected without the service mode.
*Even with
TEXT
key or "R/G/B"
key
, it can be directly switched to
each monocolor screen.
Monocolour
screen release
Monocolour
GREEN
screen
Monocolour
BLUE
screen
Monocolour
RED
screen
*A
djustment for uniformity is change to another
content. Please refer to the following page.
*E
very push of the monocolour key changes the
screen as follows.