Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 79038
Pedir dica reparação
SHORTED MOTOR Very low drive torque, Q103 and Q104 low outputs. No signalat emitter of Q103 and Q104 - measure emitter of Q103 and Q104 to groundreading should be 38 ohms. L3 and L4 of motor measure short.
MOTOR HUM AT START-UP At start up of motor for about 1/2 revolution of platter thereis a hum, then a pause, as soon as the motor is up to speed hum stops.
MODIFICATION TO INCREASE BUZZER OUTPUT Customer is complaining the buzzer is not loud enough.Buzzer becomes loud enough when the sleep switch is on. At that timeQ6 collector receives 12V for a louder amplification than the 6 volts itsees when the buzzer is on by itself. What can be done to
DISCONNECTED Q9 Distorted sound in audio section. Used signal tracer to findbreak in landing at the collector of Q9.
LOOSE CAPACITOR Capacitor had pulled away on the tone control board.
EJECT BUTTON OUT OF PROPER LOCATION When unboxed, eject button pushed inside of unit. No damageto box.
MOTOR FELL OUT OF PROPER LOCATION Cassette motor fell out of tape transport during shipment.
STOP LEVER NOT PROPERLY POSITIONED No audio when placed in play, but tape is erase, recordnormal.
BELT SLIPS OFF If the unit comes in with BELT OFF my S/S advises me that oneshould change the belt along with any repair or it will come back as aRE-REPAIR in a short time. -HQ COMMENTS: Replace the motor pulley when the capstan belt slippedoff the motor pulley in the
PCB MOUNTING SCREW BREAKS FOIL TRACE Circuit board mounting screw is tightened too much. Cracksbreak B+ path to function switch.
DEFECTIVE MOTOR Unit runs slow.
MECHANICAL MODIFICATION When customer presses record button with no tape inserted,pressure of record lever assy. against chassis causes the lever retainingportion to break off. Since the retainer is part of the chassis assembly,the entire assy would have to be replaced.
DEFECTIVE REMOTE CHIP Unit functions jammed in rewind mode voltages on Pin 33 was0.37 volts. Rewind mode voltage should read 10 volts. Voltages ofremote chip Pins 9, 5, 11 and 7 were 1.9V also should be 10 volts.Remote chip affected total operation of tape deck.
CLEANING STOP MICROSWITCH Low playback level off tape, SOURCE position OK. Recordsection checked OK, found playback amp was being muted by Q304 and Q404.Base measure 1.6V all the time. Lifted R437, playback level normal.Traced 1.6V back into system control ckt., to emitter of Q
PCB LABELLING INCORRECT Q103/104/153/154 - 3 and 4 reversed on PCB labelling. -HQ COMMENTS: Thank You for this information.

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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