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A good and useful manual. With these, We was abled to isolate and pin point the component that was causing the problem. The total time spent in troubleshooting is very much reduced.
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PURITY ADJUSTMENT ADJUSTMENT PRECAUTION:
1 PURITY ADJ. 1. Receive GREEN-ONLY signal. Adjust the beam current to about 500 ÂµA. 2. Degauss CRT enough with the degausing coil.
Make sure TV Set is in "Normal Condition" before switch to service mode for adjustNo. point Adjusting procedure/conditions Waveform and others ment.
Note: Follow the Job Instruction Sheet to adjust the magnetic field. 3. Maintain purity magnet at the zero magnetic field and keep the static convergence roughly 1 Tuner IFT 1. Get tuner ready to receive the CH. E 9 adjusted. ( PRESET ) signal,but with no signal input. 4. Observe the points a, b as shown in Fig. 4-1 Adjust the PLL data.
Oscilloscope IF OUT
No. point Adjusting procedure/conditions Waveform and others
2. Connect the sweep generator's output cable to 1n60 1000p through microscope. Adjust landing to the 10k 5. Orient the raster rotation to 0 eastward.
the tuner antenna. ( RF SWEEP ) rank A requirements. 6. Tighten up the deflection coil screws. Â» Tightening torque: 108 20 N (11 Â± 2 kgf) ANCE probe with wave detector ; see Fig.1 ) to A to correct it. 5. Set the RF AGC to 0 6 V no saturation with B Note: This adjustment must be done after the waveform. 6. Adjust tuner IF coil to obtain the waveform as Fig.2 * For the following colours press R/C RGB key to Note: Be sure to keep the tuner cover in position Fig. 4-2 change. during this adjustment. Rank "A" 3. Adjust the sweep generator's to 80dBuV. 4. Connect the response lead ( use LOW IMPED-
the tuner's IF output terminal. ( This terminal 7. Make sure CRT corners landing meet the A Fig.1 must have the probe alone connected ). rank requirements. If not, stick the magnet sheet E-9 CH
P C warming up the unit for 30 minutes or
A = B
shown in Fig. 2. -1.5+/-0.8dB longer with a beam current over 500 ÂµA.
(on right of the CRT)
Green-only Blue-only Red-only
2 RF-AGC 1. Receive "PAL COLOUR BAR" signal. Note: For the 50 ohm signal
TAKE OVER Â» Signal Strength: 57 Â± 1 dBÂµV (75 ohm open) strength gauge, when not POINT AD2. Connect the oscilloscope to TP201(Tunerâs AGC u s g 0 / 7 5 i m p d a n c e
open). B + TP210
(I C BUS 52Â±1dBÂµV(75 ohm open), in-
A Signal-colour screen cleared
JUSTMENT Terminal) as shown in Fig. 3. adapter, signal strength is
CONTROL) Oscilloscope stead of 57Â±1dBÂµV (75 ohm
0.1V Precaution: The loss of using
â A = B impedance adapter
Bias box TV Set
â Rank "A"
Â» Bias box: About 4.5 V (on left of the CRT)
Fig. 3 * Press R/C RGB key for 1 sec-
3. Call "AGC" mode in service mode. Adjust the ond in NORMAL MODE, the
"AGC" bus data to obtain the Tuner output pin colour will change to RGB mono drop 0.1V below maximum voltage. colour mode.
4. Change the antenna input signal to 63~67dBÂµV,
and make sure there is no noise. The TEXT "R. G. Cy" Key
5. Turn up the input signal 90~95 dBÂµV to be sure can be directly use to change
that there is no cross modulation beat. to other colours screen.