14D1-SA/SF/GA/GF
14D2-SA/SF/GA/GF
bA = BA = B
ABAB
Fig. 4-2
Fig. 4-1Rank "A"Fig. 4-3
Rank "A"
a
(on the right of the CRT)(on the left of the CRT)
ond in NORMAL MODE, the colour will change to RGB mono colour mode.
*Press R/C RGB key for 1 sec-
A.
m
2 kgf)
?Red-only
A.
m
7-2
20 N (11
?
Blue-only
Signal-colour screen cleared
PURITY ADJUSTMENT
just the magnetic field.This adjustment must be done after warming up the unit for 30 minutes or longer with a beam current over 500
Tightening torque: 108 change.Green-only
beam current to about 500 Note:Follow the Job Instruction Sheet to ad-field and keep the static convergence roughly adjusted.through the microscope. Adjust the landing to the rank A requirements.Erank requirements. If not, stick the magnet sheet to correct it. Note:*For the following colours press R/C RGB key to
1.Receive the GREEN-ONLY signal. Adjust the2.Degauss the CRT enough with the degausing coil.3.Maintain the purity magnet at the zero magnetic4.Observe the points a, b as shown in Fig. 4-15.Orient the raster rotation to 0 eastward. 6.Tighten up the deflection coil screws.7.Make sure the CRT corners landing meet the A
PURITY ADJ.
1
No.Adjusting pointAdjusting procedure/conditionsWaveform and others
IF OUT
1000p75ohm-1.5+/-0.8dB
V (75 ohm
m
1n60
E-9 CH1dB
?
Fig.1Fig.2
V(75 ohm open), in-
10k100km
P C
1dB
?
strength gauge, when not using 50/75 impedance adapter, signal strength is 52stead of 57open).impedance adapter
OscilloscopeNote: For the 50 ohm signalPrecaution: The loss of using
V,
m
V to be sure
m
TP201
TV Set
V (75 ohm open)
m
7-1
1 dB
?
Bias box: About 4.5 V
EFig. 3
+�
PIF ADJUSTMENT+�
sure to keep the tuner cover in position
0.1V
Bias box
during this adjustment.Oscilloscope
Signal Strength: 57
signal,but with no signal input. Adjust the PLL data.the tuner antenna. ( RF SWEEP )ANCE probe with wave detector ; see Fig.1 ) to the tuner's IF output terminal. ( This terminal must have the probe alone connected ).the waveform.shown in Fig. 2.ETerminal) as shown in Fig. 3."AGC" bus data to obtain the Tuner output pin drop 0.1V below maximum voltage.and make sure there is no noise.that there is no cross modulation beat.
1.Get the tuner ready to receive the CH. E - 92.Connect the sweep generator's output cable to3.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 saturation with6.Adjust the tuner IF coil to obtain the waveform asNote:Be 1.Receive "PAL COLOUR BAR" signal.2.Connect the oscilloscope to TP201(TunerOs AGC3.Call "AGC" mode in service mode. Adjust the4.Change the antenna input signal to 63~67dB5.Turn up the input signal to 90~95 dB
2C BUS
Tuner IFT ( PRESET )RF-AGC TAKE OVER POINT AD- JUSTMENT (ICONTROL)
No.Adjusting pointAdjusting procedure/conditionsWaveform and others12
ADJUSTMENT PRECAUTION: Make sure TV Set is in "Normal Condition" before switch to service mode for adjust- ment.
7 |
ACEC
