PIF ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
Tuner IFT
( PRESET )
1 1. Get the tuner ready to receive the CH. E - 9
signal,but with no signal input.
Adjust the PLL data.
2. Connect the sweep generator's output cable to
the tuner antenna. ( RF SWEEP )
3. Adjust the sweep generator's to 80dBuV.
4. Connect the response lead ( use LOW IMPED-
ANCE probe with wave detector ; see Fig.1 ) to
the tuner's IF output terminal. ( This terminal
must have the probe alone connected ).
5. Set the RF AGC to 0 - 6 V with no saturation with
the waveform.
6. Adjust the tuner IF coil to obtain the waveform as
shown in Fig. 2.
Note:Be sure to keep the tuner cover in position
during this adjustment.
RF-AGC
TAKE OVER
POINT AD-
JUSTMENT
(I
2
C BUS
CONTROL)
1. Receive "PAL COLOUR BAR" signal.
» Signal Strength: 57 ± 1 dBµV (75 ohm open)
2. Connect the oscilloscope to TP201(Tuner’s AGC
Terminal) as shown in Fig. 3.
3. Call "AGC" mode in service mode. Adjust the
"AGC" bus data to obtain the Tuner output pin
drop 0.1V below maximum voltage.
4. Change the antenna input signal to 63~67dBµV,
and make sure there is no noise.
5. Turn up the input signal to 90~95 dBµV to be sure
that there is no cross modulation beat.
Note: For the 50 ohm signal
strength gauge, when not
using 50/75 impedance
adapter, signal strength is
52
±
1dB
µ
V(75 ohm open), in-
stead of 57
±
1dB
µ
V (75 ohm
open).
Precaution: The loss of using
impedance adapter
2
Fig. 3
Fig.1
Fig.2
PURITY ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
PURITY ADJ. 1. Receive the GREEN-ONLY signal. Adjust the
beam current to about 500 µA.
2. Degauss the CRT enough with the degausing coil.
Note: Follow the Job Instruction Sheet to ad-
just the magnetic field.
3. Maintain the purity magnet at the zero magnetic
field and keep the static convergence roughly
adjusted.
4. Observe the points a, b as shown in Fig. 4-1
through the microscope. Adjust the landing to the
rank A requirements.
5. Orient the raster rotation to 0 eastward.
6. Tighten up the deflection coil screws.
» Tightening torque: 108 ± 20 N (11 ± 2 kgf)
7. Make sure the CRT corners landing meet the A
rank requirements. If not, stick the magnet sheet
to correct it.
Note: This adjustment must be done after
warming up the unit for 30 minutes or
longer with a beam current over 500
µ
A.
* For the following colours press R/C RGB key to
change.
1
* Press R/C RGB key for 1 sec-
ond in NORMAL MODE, the
colour will change to RGB mono
colour mode.
The TEXT Key "R. G. Cy" Key
can be directly use to change
to other colours screen.
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