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Home >> PHILIPS >> 25TR19C225 Service Manual
 
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PHILIPS 25TR19C225
Service Manual


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

Description of PHILIPS 25TR19C225 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 11 (click to view)
voltage, and +5 volts. The EHTINFO line is the DAG line. This line is fed back to the Signal Processor IC, 7250, to adjust the Picture level to compensate for changes in Beam Current. The EHTINFO line is also connected to resistor 3478 and zener diode 6480. If this line should go excessively negative, which would be caused by excessive Beam Current, transistor 7481 will turn On. This will place a High on the P9STBYON_PROT line shutting the set Off. The Filament voltage is monitored for no voltage or excessive voltage. The Filament voltage is rectified by 6463 and fed to the base of transistor 7462. If the voltage on the base of 7462 goes above 6.8 volts, 7462 will turn On, turning 7463 On. This

will place a High on the HEW_PROT line. This will shut the Horizontal drive Off. The EW_DRIVE from the Signal Processor drives transistor 7470 to make linearity corrections in the Horizontal Drive. If Horizontal drive should fail, the source leg of 7470 will go High, placing a High on the P9STBYON_PROT line shutting the set down. MICROPROCESSOR SWITCHING 6) (Figure

In the Standby mode, Pin 19 of the Microprocessor, 7600, is held Low by a switching circuit inside the IC. When Set is turned On, this circuit switches

FIGURE 6 - MICROPROCESSOR

PAGE 10

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