14B2-TX/20B2-TX
21B2-TX
bA = BA = B
ABAB
Fig. 4-1Fig. 4-2Fig. 4-3
Rank "A" Rank "A"
a
(on the right of the CRT)(on the left of the CRT)
in NORMAL MODE, the colour will change to RGB mono colour mode.
*Press R/C RGB key for 1 second
Fig. 4-1
Blue only
8-2
(-0.10 gauss)(0.40 gauss)
Green onlySignal colour screen cleared
PURITY ADJUSTMENTjust the magnetic field. Vertical Bv:-0.010 mTHorizontal Bh:+0.040 mTwarming up the unit for 30 minutes or longer with a beam current over 700 ?A. (20" & 21") (For 14", the beam current should be over 500 ?A).Set the service mode by JA122 & JA124 (short) then press factory proc- ess R/C RGB key to change to RGB mono colour mode.
Tightening torque: 108 ? 20 N (11 ?2 kgf)to change.
beam current to ~700 ?A (20" & 21")/~500 ?A (14").coil. Note:Follow the Job Instruction Sheet to ad-magnetic field and keep the static convergence roughly adjusted.through the microscope. Adjust the landing to the rank A requirements.EA rank requirements. If not, stick the magnet sheet to correct it. Note:This adjustment must be done afterNote:*For the following colours press R/C RGB keyRed only
1.Receive the GREEN-ONLY signal. Adjust the2.Degauss the CRT enough with the degausing3.Maintain the purity magnet at the zero4.Observe the points a, b as shown in 5.Orient the raster rotation to 0 eastward. 6.Tighten up the deflection coil screws.7.Make sure the CRT corners landing meet the
PURITY ADJ.
1
NO.Adjustment partAdjusting procedure and conditionsWaveform and others
IF OUT
1000p75ohm-1.5+/-0.8dB
1n60
E-9 CH
Fig. 1Fig. 2
10k100k
P C
For the 50 ohm signal strength gauge, when not using 50/75 impedance adapter, signal strength is 52 ?1 dB?V(75 ohm open), instead of 57 ?1 dB?V (75 ohm open).The loss of using impedance adapter
OscilloscopeNote:Precaution:
) to
Fig.1
.
TP201
Fig. 3TV Set
8-1
.Fig. 3
Bias box: About 4.5 V
E
Fig. 2
PIF ADJUSTMENT+�
+�
sure to keep the tuner cover in
position during this adjustment.0.1V
Signal Strength: 57 ?1 dB?V (75 ohm open)Bias box
Oscilloscope
signal, but with no signal input. Adjust the PLL data.to the tuner antenna. (RF SWEEP)ANCE probe with wave detector; see the tuner's IF output terminal. (This terminal must have the probe alone connected).with the waveform.as shown in E AGC Terminal) as shown in "AG" bus data to obtain the Tuner output pin drop 0.1 V below maximum voltage.63~67dB?V, and make sure there is no noise.sure that there is no cross modulation beat.
1.Get the tuner ready to receive the E-9 CH2.Connect the sweep generator's output cable3.Adjust the sweep generator's to 80dBuV. 4.Connect the response lead (use LOW IMPED-5.Set the RF AGC to 0 - 6 V with no saturation6.Adjust the tuner IF coil to obtain the waveformNote:Be 1.Receive "PAL COLOUR BAR" signal.2.Connect the oscilloscope to TP201 (TunerOs3.Call "AG" mode in service mode. Adjust the4.Change the antenna input signal to5.Turn up the input signal to 90~95 dB?V to be
2C BUS
TUNER IFT (PRESET)TAKE OVER POINT ADJUSTMENT (ICONTROL)
12RF-AGC
NO.Adjustment partAdjusting procedure and conditionsWaveform and others
8 |
ACEC
