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SHARP 20B2TX
Service Manual


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

Description of SHARP 20B2TX 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 19 (click to view)
TROUBLE SHOOTING TABLE (Continued)
NO RASTER
CIRCUITS TO BE CHECKED: Tuner. PIF. Automatic Gain Control. Contrast, Brightness and Sound controls ?
Normal Replace the fuse.

14B2-TX/20B2-TX 21B2-TX

PICTURE, NO SOUND

Check F701. Blown out. (5V), (33V) Power Source. Does the noise level increase at max.

Noise increases but no signal is received.
(Approx. 310V at 220V AC)

No snow noise.

The fuse is blown out again.

Check T701 pin (7) voltage Abnormal

Check IC701, D701 and C707. NO YES

Normal 5V. BT must be approx. 32V D709.

Check the tuner supply voltage LB must Check R701, R707 and IC801 ? and CH preset data check.

Does signal appear at pin (40) of

Secondary Main+B Does signal Check IC801 and

Normal T701 (17) voltage appear at pin (38) its related circuit.
Check the tuner AGC NO YES at TP201. D758, IC702, IC753 Check CRT connector D1001 (Power LED Green) Check Q204 and Normal Abnormal
NO its related circuit.
D1001 (Power LED Red) Check pin (27) of IC801, Tuner and

Abnormal (Approx. 115V) Normal of IC801 ?

and R712. K1-K5 bias. turns on. YES

Abnormal Normal

Check pin (38) of on or turns ON/OFF. Check pin (1) of SF201 and IC801. Tuner's related circuit.
Checking the protector circuit.

R615 R618. Check pin (37) of IC801 and C878. IC801. related circuit.

Check ON/OFF ON

related circuit.

18
YES CIRCUITS TO BE CHECKED:

Bus error mode Does horizontal circuit See Fig.1 NO oscillate ?

Check IC801, IC751, D605 (44) of IC801. and Q601. » Sound Detector Circuit.

» Sound system pins (28) and » Sound Switch and Att. NO Does signal appear at pin (28)

NO SOUND
Control. (44) IC801 ? of IC801?
If a bus error happens, LED RED [pin (11) of IC801 LOW] indicator starts blinking and the

» Audio Output Circuit. power is turned off. YES The power key (CHANNEL button on the TV) is still effective. (Signal)

YES NO

Fig.1 EEPROM IC1003

V/C/J IC801

(6) and (8) of IC301 ? Check IC801. peripheral circuit.

NO (M24C08) Does signal appear at pins Check C356 and YES (IX3412CE)

AV Switch IC401

(M52797SP)

PLL Tuner TU201 2s 0.5s

(VTST5HD84)

P301 connector of Check Q301, pins (4) and (6) IC301 circuit. of IC801 and peripheral circuit.

18-1 18-2

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