Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 78879
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REPAIR BOARD COMPATIBILITY Chassis #SCC204A-A found change in M-2 board not reflected onprint. R025 exists in series with IC031. Which print applies? Are thereany other changes? -HQ COMMENTS: R025 resistor's function is to fine tune RC constant forVC formation from PWM pulses.
TUNING DRIFT, REPLACED D2007 After about 8 hours this set would start drifting on low band.Servicer claimed that only ch. 2 and 3 would drift, rest of low band OK.Upon further inspection I determined that what was actually occuring wasthat low band channels were switching into high
DEAD All six above sets were dead out of the carton. Inspectionrevealed no B+ to receiver. I then noted the leads to R901 were bothbroken right at the terminals of the resistor. Throwing out thepossibility of sabotage, it appears that the problem was cause
NO PICTURE, SEE SB0200R Found D064 leaky, this was replaced and 15 days later unitcame back and this time D063 was found to be leaky. Ten days later unitcame back with D063 leaky again. Each time the diode is replaced.
LOOSES MEMORY, REPLACED D514 This receiver had no memory. Stations could be programmed,but would be lost as soon as channel was changed. Inspection revealed thatIC034/Pin 7 was positive, -24V was missing. Scope showed horiz. pulse on-24V line. Further checking quickly revealed D51
INTERMITTENT COLOR DISTORTION, REPLACED C342 Highly intermittent color-wrong colors-complete loss of color.Drastic hue changes would occur faces would be all blue or all green.Red would drop out completely, then chroma would degenerate into narrowrainbow lines, eventually resulting in absolute loss
PARTS AVAILABILITY Please investigate if the drive cords for the electromotivearms may be available as a separate part for replacement instead ofreplacing the complete arm assy which is so expensive. Refer to page 29of Service Manual. -HQ COMMENTS: The pipe side end of d
SHIFTED PICTURE, REPLACED YOKE Picture shifted up and slightly to the left.
REPLACEMENT OF Q801 The sound cuts off with a high level bass signal.
NEW IC USED The above unit uses uPD1703C517 P/N 8-759-100-18. Thispart is listed on Page 35 of the Preliminary Service Manual. The lastS/M printed list this IC on Page 96 as uPD1703C522 P/N 8-759-100-59.Do they have the same program? If not please inform KC to st
DEFECTIVE FE COIL No control of speed, it is too fast on two stock units.
CAREFUL REASSEMBLY REQUIRED The spring was out of the grove on the auto shut offmechanism. After placing spring in grove and reassembling unit, it wouldnot shut off at end of tape.
SHORTED C805 No power. A short across battery terminals occur whencapacitor (C805) is bent down on the PC board or when the leads arepushed into the body.
SCREW BECOMES LOOSE Screw on control plate block assy comes loose, touchingbottom side of flywheel.
GEAR NEEDS BENDING This unit had no take-up. Gear #364 was not low enough toengage gear #368.

Assistência TécnicaAs dicas apresentadas destinam-se a técnicos de eletrónica, a tentativa de reparação ou assistência sem ter conhecimentos de eletricidade e eletrónica, podem provocar danos mais graves aos equipamentos e, devido a tensões muito elevadas em alguns circuitos, graves danos fisicos que podem constituir um risco em determinadas reparações.

Não arrisque reparar equipamentos com tensões elevadas se não tiver conhecimentos técnicos para o fazer em segurança.

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