21B-S1
PIF ADJUSTMENTPURITY ADJUSTMENT
NO. Adjustment partAdjusting procedure and conditionsWaveform and othersNO. Adjustment partAdjusting procedure and conditionsWaveform and others
1Tuner IFT1. Get the tuner ready to receive the E-9 CH1PURITY ADJ.1. Receive the GREEN-ONLY signal. Adjust the
(PRESET)signal, but with no signal input.beam current to ~700 ?A (21")/~500 ?A (14").
Adjust the PLL data.2. Degauss the CRT enough with the degausing
1n601000p
2. Connect the sweep generator's output cable10kcoil.ab
to the tuner antenna. (RF SWEEP)OscilloscopeIF OUTNote: Follow the Job Instruction Sheet to ad-
3. Adjust the sweep generator's to 80dB?V.100k75ohmjust the magnetic field.
4. Connect the response lead (use LOW IMPED-Vertical Bv: +0.030 mT
ANCE probe with wave detectorFig.1; see ) to(0.30 gauss)
the tuner's IF output terminal. (This terminalFig. 1Horizontal Bh : +0.020 mT
must have the probe alone connected).E-9 CH(0.20 gauss)Fig. 4-1
5. Set the RF AGC to 0 - 6 V with no saturation(Reference page 6.)
with the waveform.3. Maintain the purity magnet at the zero
6. Adjust the tuner IF coil to obtain the wavPeform Cmagnetic field and keep the static convergence
as shown in Fig. 2.-1.5+/-0.8dBroughly adjusted.A
4. Observe the points a, b as shown in Fig. 4-1
Note:Be sure to keep the tuner cover inFig. 2through the microscope. Adjust the landings
position during this adjustment.to A rank requirements.B
5. Orient the raster rotation to 0 eastward.
6. Tighten up the deflection coil screws.
A = B
? Tightening torque:? 20 N (11 108 ?2 kgf)
7. Make sure the CRT corners landing meet the
A rank requirements. If not, stick the magnet
Fig. 4-2
sheet to correct it.
Rank "A"
2RF-AGC1. Receive "PAL COLOUR BAR" signal.Note:Note: This adjustment must be done after(on the right of the CRT)
TAKE OVER? Signal Strength: 54 ?1 dB?V (75 ohm open)For the 50 ohm signal strengthwarming up the unit for 30 minutes
POINTgauge, when not using 50/75
or longer with a beam current over
8ADJUSTMENT2. Connect the oscilloscope to TP210 (TOsimpedance adapteruner, signal700 ?A (21").
(I2C BUSAGC Terminal) as shown in Fig. 3.strength is 52 ?1 dB?V(75 ohm(For 14", the beam current should be
CONTROL)open), instead of 54 ?1 dB?VA
over 500 ?A).
Oscilloscope(75 ohm open).Note:Set the service mode by TP1001 &
+TP210Precaution:
0.1VTP1002 (short) then press factory
�The loss of using impedanceprocess R/C RGB key to change toB
adapterRGB mono colour mode.
Bias boxTV SetA = B
+
* For the following colours press R/C RGB key
to change.
�
Fig. 4-3
? Bias box: About 4.5 V
Rank "A"
Fig. 3Red onlyGreen onlyBlue only(on the left of the CRT)
3. Call "AG" mode in service mode. Adjust the
* Press R/C RGB key for 1 second
"AG" bus data to obtain the Tuner output pin
Signal colourin NORMAL MODE, the colour
drop 0.1 V below maximum voltage.
screen clearedwill change to RGB mono colour
4. Change the antenna input signal to
mode.
63~67dB?V, and make sure there is no noise.
5. Turn up the input signal to 90~95 dB?V to be
sure that there is no cross modulation beat.
8-18-2 |
ACEC
