SHARP 21EFG3RU
Manual de Servicio

21E-FG3RU

PIF ADJUSTMENT
No. Adjustment point 1 Tuner IFT ( PRESET ) Adjustment condition/procedure 1. Get the tuner ready to receive the CH. E - 9 signal,but with no signal input. Adjust the PLL data. 2. Connect the sweep generator's output cable to the tuner antenna. ( RF SWEEP ) 3. Adjust the sweep generator's to 80dBµV. 4. Connect the response lead ( use LOW IMPEDANCE probe with wave detector ; see Fig.1 ) to the tuner's IF output terminal. ( This terminal must have the probe alone connected ). 5. Set the RF AGC to 0 - 6 V with no saturation with the waveform. 6. Adjust the tuner IF coil to obtain the waveform as shown in Fig. 2. Note: Be sure to keep the tuner cover in position during this adjustment. Waveform or others
No. Adjustment point 1 PURITY ADJ.

PURITY ADJUSTMENT
Adjustment condition/procedure 1. Receive the GREEN-ONLY signal. Adjust the beam current to ~700 µA. 2. Degauss the CRT enough with the degausing coil. Note: Follow the Job Instruction Sheet to adjust the magnetic field. Vertical Bv: +0.030 mT (0.30 gauss) Horizontal Bh: +0.020 mT (0.20 gauss) (Reference: page 7-2) 3. Maintain the purity magnet at the zero magnetic field and keep the static convergence roughly adjusted. 4. Observe the points a, b as shown in Fig. 1-1 through the microscope. Adjust the landings to the A rank requirement. 5. Orient the raster rotation to 0 eastward. 6. Tighten up the deflection coil screws. » Tightening torque: 108 ± 20 N (11 ± 2 kgf) 7. Make sure the CRT corners landing meet the A rank requirements. If not, stick the magnet sheet to correct it. Note: This adjustment must be done after warming up the unit for 30 minutes or longer with a beam current over 700 µA. Note: Set the service mode by JA304 & JA307 (short) then press factory process R/C RGB key to change to RGB mono colour mode. * For the following colours press R/C RGB(Hex 7E) key to change. Waveform or others

a

b

10k
Oscilloscope

1n60

1000p IF OUT

100k

1000p 75ohm

Fig.1
E-9 CH P C
-1.5+/-0.8dB

30mm

Fig. 1-1

30mm

A

Fig.2

B A=B
Fig. 1-2 Rank "A" (on the right of the CRT)

2

RF-AGC TAKE OVER POINT ADJUSTMENT (I2C BUS CONTROL) (AUTO & MANUAL ADJ)

1. Receive "PAL COLOUR BAR" signal. » Signal Strength: 56 ± 1 dBµV (75 ohm open) 2. Connect the oscilloscope to TP201 (Tuner�s AGC Terminal) as shown in Fig. 3-1.
Oscilloscope 0.1V + � Bias box + �
» Bias box: About 4.5 V

* for Auto ADJ 1)Receive �PAL COLOUR BAR� signal. signal strength: 56 ± 1dBµV(75 ohm open) 1)Go to service mode. 2)Go to service data V01, press R/C to operate auto key (Hex C1) and confirm the �OK� display on the screen. 3)If appear NG, increase data some step and pls repeat step 2 again. 4)proceed step 4 & 5 in manual mode.

TP201

A

8

TV Set

GREEN ONLY

BLUE ONLY Signal-colour screen cleared

RED ONLY

B A=B

Fig. 3-1
3. Call "V01" mode in service mode. Adjust the "V01" bus data to obtain the Tuner output pin drop 0.1~1.0V below maximum voltage. 4. Change the antenna input signal to 63~67dBµV, and make sure there is no noise. 5. Turn up the input signal to 90~95 dBµV to be sure that there is no cross modulation beat.

Fig. 1-3

Rank "A" (on the left of the CRT)
* Press R/C RGB key for 1 second in NORMAL MODE, the colour will change to RGB mono colour mode.

8-1

8-2