Service manuals, schematics, eproms for electrical technicians
KNOLL HT221 INFO
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PROJECTOR
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PROJECTOR
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If you get stuck in repairing a defective appliance download this repair information for help. See below.
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar knoll manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar knoll manual?
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- Also known:
KNOLL HT-221 HT221 INFO HT 221
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Have a nice Day! - See related repair forum topics below. May be help you to repair.
Warning!
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Relevant PROJECTOR forum topics:
Galvanikus kapcsolat javítható forrasztás nélkül a melléket linken vásárolható vezetőképes ragasztó"-val (valaki keresett ilyet)
http://epitkezes-kert.vatera.hu/barkacs_szerszam_ipari_gep/rogzitestechnika/hegesztestechnika/forrasztas_paka_nelkul_vezetokepes_ragaszto_1959796814.html
Sziasztok.
Kocsmában üzemelő zenegéphez keresek programot, mert az eredeti hdd megsérült és nem menthető róla adat.
A gép tipusa ismeretlen, egy PII-es alaplap van benne meg az erősítő.
Érmevizsgáló com portra, gombok a billentyűzet ps2-es portjára van csatlakoztatva.
Ha valaki tudna ebben segíteni.
Üdv. Józsi
Working on a speed charge battery maintainer for small engines battery. Heat sink had (2) S2025R T0-220 type components on it. Seems they are an SCR and I have 57 ohms on 1 and 3 pin, so seem they are short. Cant get these anymore but installed S4025R which seems to be better replacement. Before replacing, heat sink seemed to be really hot after replacng on on
board 10 amp automotive slot type fuse, so seemed these SCR were bad, getting hot woth no load.
Standby LED not lighting with new SCR's installed. Old ones did not have heat sink compound on them, so I used some to better transfer heat. I saw the input of the 7805 1 amp
regulator IC has short, so removed it, and its not shorted, but the feed to it comes from the IC chip on board, a EM78P41 BWD20J. Data sheet for EM78P41 is online. They have pin 16 going to pin 1 of the 7805 regulator. Actual reading on pin 16 to ground is 2.5 ohms. I suspect this IC is shorted output. Is there chance to replace IC or is this repair finished?
board 10 amp automotive slot type fuse, so seemed these SCR were bad, getting hot woth no load.
Standby LED not lighting with new SCR's installed. Old ones did not have heat sink compound on them, so I used some to better transfer heat. I saw the input of the 7805 1 amp
regulator IC has short, so removed it, and its not shorted, but the feed to it comes from the IC chip on board, a EM78P41 BWD20J. Data sheet for EM78P41 is online. They have pin 16 going to pin 1 of the 7805 regulator. Actual reading on pin 16 to ground is 2.5 ohms. I suspect this IC is shorted output. Is there chance to replace IC or is this repair finished?
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