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SHARP GA200
Service Manual


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

Description of SHARP GA200 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 25 (click to view)
GA-200 SERVICE NOTES
Figure 24 (lower part of diagram) shows the parabolic voltage at line frequency on terminals of C617 (do not confuse with E/W modulation which operates at 100Hz) which, as can be seen in figure 25, is modulated at vertical frequency, due to the modulation brought about by the E/W. The parabolic form of the signal (31 KHz) allows for controlling the gate of transistor Q612, so that when the signal reaches the highest point, it saturates Q609, which cuts out Q612. Control of the gate is achieved by means of Q609 and the

2

divider formed by R631 and R630. Figure 25 shows the same signals in vertical frequency, where the attack on the gate of Q612 can be observed.

D

R

A

T

F

Figure 24

Figure 25

In this circuit, a safeguard (Q614) has been incorporated to protect against overvoltage peaks in the Source of Q612 when turning the television set on.

22

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