29
V-FT450S
/29V-FT95S
20
ADJUSTMENT
PIF ADJUSTMENT CHECKING
NO
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR REMARKS
1
RF-AGC
(1) Receive "US 10CH HALF COLOR BAR" signal
TAKE OVER POINT
Signal Strength: 56 ± 1dBµV (75 ohm termination)
Confirmation Voltage : 3.6 ± 0.4 VDC
ADJUSTMENT
Monitor point : TP53
(I2C BUS CONTROL)
Manual Adjustment
(2) Connect the oscilloscope to TP53 (Tuner's AGC Terminal) as shown in figure 3-1.
OSCILLOSCOPE
BIAS BOX
TV SET
Bias Box : about 4.5V
Fig. 3
(3) Select "RF-AGC" item in the Adjustment Mode. Adjust the "RF-AGC"
bus data to obtain the Tuner output pin drop
0.1V
～
1.0V
below maximum voltage
Auto Adjustment
(4) Select "RF-AGC" item in the Adjustment Item. Push the RF-AGC button, blue display with
OK sign indicates the adjustment is working properly.
(5) Change the antenna input signal to 63 ~ 67dBµV, and make sure there is no noise.
(6)Turn up the input signal to 90 ~ 95 dBµB to be sure that there is no cross modulation beat.
PURITY ADJUSTMENT
NO
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR REMARKS
1
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 CRT enough with the degausing coil.
a b
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.
90 mm
90mm
With P-MAG, adjust it to the center - rank A.
Fig. 1 -1
(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 the east direction.
A
(7) Tighten the deflection coil fastening screws.
A=B
Tightening torque : 108N ± 20N ( 11Kgf ± 2Kgf )
B
(8) Checking the CRT corner area, bond the magnetic sheet to set the landing at
rank A for compensation.
Fig 1 -2 . Rank A (On the right of CRT)
Note: Apply the adjustment after aging with the beam current 1700±50µA or more
for 30 minutes or more.
Note: Select the service mode, and press the monocolor key of R/C for process,
A
and the monocolor screen (green) will be selected.
A=B
B
* Every push of the monocolor key, changes the screen as follows.
Fig. 1 - 3 . Rank A (On the left of CRT).
*Continuously press the monocolor key
1 second or more, and the monocolor 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.
2
UNIFORMITY
Before adjustment begin,Horizontal magnetic field = 0G
ADJUSTMENT
Vertical magnetic field = Each destination's adjustment magnetic field
(To perform after the
Make sure to degauss it.
purity and
convergence
(North direction red uniformity)
adjustment)
(1) Horizontal mf = Set to monocolor screen red and adjust to +0.20G.
(2) Pay attention to the edge of CRT,if the landing is poor adjust by attaching the
the compensation magnet at the back of CRT.
(CRT surface)
(refer to Fig-1)
Mislanding
(South direction red uniformity)
(1) Horizontal mf = Set to monocolor screen red and adjust to -0.20G.
(2) Pay attention to the edge of CRT ,if the landing is poor adjust by attaching th
compensation magnet at the back of CRT.
(The same method is applied for adjustment of monocolor screen blue for
blue uniformity ,and changing both the magnetic field for north and south
direction.)
(CRT back)
*During the pasting of compensation magnet , use the crosshatch pattern .
compensation magnet
Make sure there is no blur or bendlines occur.
If the blur or bend are serious,adjust the location of compensation magnet
Fig-1
to make it better.
+
-
+
-
TP51
Monocolor screen
release
mono olor
GREEN
SCREEN
mono color
BLUE
SCREEN
mono color
RED
SCREEN
0.1V
～
1.0V
