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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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PIF CHECKING PURITY ADJUSTMENT
NO. Adjustment part Adjusting procedure conditions Waveform and others
TUNER IFT Get tuner ready to receive E-9 CH sig1 PURITY 1. Receive GREEN-ONLY signal. Adjust the
(PRESET) nal, but with no signal input. ADJUSTMENT beam current to ~700 (21")/~500 ÂµA (14").
Adjust PLL data. 2. Degauss CRT enough with the degausing
10k 1n60 1000p 2. Connect the sweep generator's output cable coil.
tuner antenna. (RF SWEEP) Oscilloscope IF OUT Note: Follow the Job Instruction Sheet to ad-
3. Adjust sweep generator's to 80dBÂµV. 100k 75ohm just the magnetic field. 4. Connect the response lead (use LOW IMPEDVertical Bv : -0.010 mT Fig. 4-1 must have the probe alone connected). (0.40 gauss)
ANCE probe with wave detector; see Fig.1) to (-0.10 gauss) the tuner's IF output terminal. (This terminal Fig. 1 Horizontal Bh : +0.040 mT
5. Set the RF AGC to 0 6 V with no saturation (Reference: page 8/21) 6. Adjust tuner IF coil to obtain waveform netic field and keep the static convergence 4. Observe the points a, b as shown in Fig. 4-1
with waveform. 3. Maintain purity magnet at the zero mag-
as shown in Fig. 2. roughly adjusted. -1.5+/-0.8dB A
Note: Be sure to keep tuner cover in posithrough microscope. Adjust the landings Fig. 2 5. Orient the raster rotation to 0 eastward. 6. Tighten up the deflection coil screws. Â» Tightening torque: 108 Â± 20 N (11 Â±2 kgf) 7. Make sure CRT corners landing meet the
tion during this adjustment. to A rank requirements. B
A = B
Note: This adjustment must be done after
TAKE OVER Â» Signal Strength: 57 Â±1 dBÂµV (75 open) For the 50 ohm signal strength warming up the unit for 30 minutes POINT gauge, when not using 50/75 or longer with a beam current over ADJUSTMENT 2. Connect the oscilloscope to TP201 (Tunerâs impedance adapter, signal 700 (21") ÂµA. (I C BUS AGC Terminal) as shown in Fig. 3. strength is 52 dBÂµV(75 ohm (For 14", the beam current should be Â±12 CONTROL) open), instead of 57 dBÂµV A over 500 Â±1 ÂµA). Note: Set the service mode by JA122 & 0.1V The loss of using impedance B â ess R/C key change to RGB adapter. mono colour mode. * For the following colours press R/C RGB key to change.
A rank requirements. If not, stick the magnet sheet to correct it. Rank "A" (on right of the CRT)
Fig. 4-2 2 RF-AGC 1. Receive "PAL COLOUR BAR" signal. Note:
Fig. 3 (on left of the CRT)
(75 ohm open). + TP201 Precaution: JA124 (short) then press factory proc-
Bias box TV Set A = B
â Fig. 4-3
Â» Bias box: About 4.5 V
Red Green Blue only
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 will change to RGB mono colour mode.
in NORMAL MODE, the colour drop 0.1 V below maximum voltage. 4. Change the antenna input signal to 63~67dBÂµV, and make sure there is no noise.
5. Turn up the input signal 90~95 dBÂµV to be
sure that there is no cross modulation beat.