Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 81543
Pedir dica reparação
TRANSISTORS SHORTING TO HEAT SINK After the output transistors have been replaced, and unit hasplayed, the outputs will go out again.
DC BALANCE DC balance on the speaker outputs is determined by matchingof Q302 and Q303.
REPLACEMENT TRANSISTORS ARE IMPROVED Customer complained of noise with volume control at midposition, standard input levels.
SWITCH OUT OF PROPER LOCATION No audio output on any function - function switch (S1) wafers180 degrees out.
LEAD DRESSING NEEDED Whining noise from processor with no FM signal and muting off.
WIRE NUMBERS ARE REVERSED Incorrect wire number. Numbers #1 and #3 reversed.
DEFECTIVE OUTPUTS The NPN output transistor opened on one channel of each ofthese receivers. No other problems found.
P/N FOR GLASS Cases of concealed damage to front glass on these models havebeen reported. Present solution is to replace entire front panel assemblybut it is costly. -HQ COMMENTS: A similar situation developed on the STR-4800SD, -5800SD,-6800SD models 3 years ago.
PROTECTION TRANSISTORS REVERSED Burned main amplifier board was replaced (X-482-232-50).Amplifier clipped at 1 watt out.
DEFECTIVE IC20, 301, Q301, 302 No AM or FM - IC201 voltages incorrect, Q301 collector read 11volts. Replacement of individual IC, would knock the other chip out.
ADJUSTMENT NEEDED The maximum deflection on tuner input meter did not correspondto center channel on tuning meter. Adjustment of FM discriminator and FMIF was unsuccessful.
DEFECTIVE Q701 Noise in back channel outputs. -HQ COMMENTS: Replaced regulator transistor Q701, 2SC1124.
WEAK MOTOR Tone arm would not complete return and play cycle wouldstop widway most times.
DEFECTIVE MGH Turntable speed erratic. Maximum output from MGH was 15-20MVp-p. Even slight readjustment of the head caused it to scrape theplatter.
LOOSE LEAD ON C101 Frequent slowing down of motor. Found one lead of C101loose.

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.

Verifique se o esquema está disponível na área de downloads