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SHARP 21DFG3RU
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SHARP 21DFG3RU Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 8 (click to view)
21D-FG3RU

PUITY ADJUSTMENT
No. Adjustment point 1 PURITY ADJ. Adjustment procedure/conditions 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 7-1) 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 and others No. Adjustment point 1 CONVERGENC ADJ. ( To be done after the purity adjustment.)

CONVERGENCE ADJUSTMENT
Adjustment procedure/conditions 1. Receive the "Crosshatch Pattern" signal. 2. Using the remote controller, call NORMAL mode. Static convergence 1. Turn the 4-pole magnet to a proper opening angle in order to superpose the blue and red colours. 2. Turn the 6-pole magnet to a proper opening angle in order to superpose the green colour over the blue and red colours. Dynamic convergence 1. Adjust the convergence on the fringes of the screen in the following steps. a) Fig. a: Drive the wedge at point "a" and swing the deflection coil upward. b) Fig. b: Drive the wedge at point "b" and "c" and swing the deflection coil downward. Fig. b Waveform and others

BGR B G R
Fig. a

a

b

30mm

30mm

RGB R G B

A B A=B

Rank "A" (on the right of the CRT)

c) Fig. c: Drive the "c" wedge deeper and swing the deflection coil rightward. d) Fig. d: Drive the "b" wedge deeper and swing the deflection coil leftward. 2. Fix all the wedges on the CRT and apply glass tape over them. 3. Apply lacquer to the deflection yoke lock screw, magnet unit (purity, 4-pole, 6-pole magnets) and magnet unit lock screw.

B G R

RGB

Fig. c

R G B

BGR

8

A

Finally received the Red-only and Blue-only signals to make sure there is no other colours on the screen.
4-pole magnet

Fig. d

GREEN ONLY

BLUE ONLY Signal-colour screen cleared

RED ONLY

B A=B
6-pole magnet CRT neck

Wedge "a" About 100Deg Lacquer About 100Deg

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.
Lacquer Purity magnet
20mm

Wedge "b"

Wedge "c"

8-1

8-2

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