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SHARP 21BS5
Service Manual


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

Description of SHARP 21BS5 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)
14B-S5 21B-S5

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 µA (14").

Adjust PLL data. 2. Degauss CRT enough with the degausing

a b
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 80dBµV. 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)
P C

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

E-9 CH

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. » Tightening torque: 108 ± 20 N (11 ±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 » Signal Strength: 57 ±1 dBµV (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 (Tuner’s impedance adapter, signal 700 (21") µA. (I C BUS AGC Terminal) as shown in Fig. 3. strength is 52 dBµV(75 ohm (For 14", the beam current should be ±12 CONTROL) open), instead of 57 dBµV A over 500 ±1 µA). Note: Set the service mode by JA122 & 0.1V The loss of using impedance B – ess R/C key change to RGB adapter. mono colour mode. * For the following colours press R/C RGB key to change.
Oscilloscope

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:

8
Fig. 3 (on left of the CRT)

(75 ohm open). + TP201 Precaution: JA124 (short) then press factory proc-

Bias box TV Set A = B

+

– Fig. 4-3

» Bias box: About 4.5 V
Red Green Blue only

Rank "A"

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.

Signal colour

screen cleared

in NORMAL MODE, the colour drop 0.1 V 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 90~95 dBµV to be

sure that there is no cross modulation beat.

8-1 8-2

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