Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 77938
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POOR V LINEARITY, R517 INCREASED IN VALUE Poor vertical linearity top 1/3 of picture slightlycompressed. Vertical size control to end of range. Waveform at base ofQ501, blanking pulse 5 msec, it should be 1.2 msec.
DEAD Dead set, 1.6 amp fuse blown, horizontal out transistorshorted, B+ regulator shorted.
INTERMITTENT SHUT DOWN, REPLACED R532 The set would intermittently shut down.
NO COLOR, RESOLDERED R356 No color. Checked CW signal at the collector of Q307 whichwas not there. Signal was present at the base. I checked the DCvoltage - collector was 18V, that told me that the transistor was notconducting. Base voltage was normal (3V) emitter was 2.8V.
GREEN PICTURE, REPLACED C323 Severe bright green screen no control.
SHUT DOWN, REPLACED C5112 Immediate shut down - no high voltage.
DEAD, BUSHING ON VERT OUTPUT WAS CARBONIZED Unit cannot be turned on. When the power switch is activated,unit comes on for 2 seconds and goes off. Checked and F6103 was foundopen. 120V line was loaded. When I checked resistance from 120V B+ toground, I read 150 ohms both ways. GA-9 (plug) Pin
NO AUDIO No audio - any function. Acts like bad function switchbecause if applied additional pressure on knob volume works - releaseknob - no audio.
DEFECTIVE MOTOR Tape player would not run. Motor seemed to draw excesscurrent. A check of the motor revealed the FG winding was shorted to themain winding.
WEAK BATTERY SPRING Customer complaints of wow while tapping the unit (I found 4units with the same problem).
MISPRINT IN S/M On page 23 of TCM-280/280B service manual a part numbermisprint exists. -HQ COMMENTS: The correct part numbers for two diodes are as follows:DM-101 8-745-101-01DM-101A 8-745-101-11The DM-101 substitutes for the DM-101. Thus, in this case, the part
CONNECTION ERROR IN MANUAL The connection point shown for the white wire is incorrect.This should go to the other end of R719. The wiring diagram in themanual supplement #2 is not clear on where this wire connects. Also, theblack jumper wire and R707 to the connecting point of t
OPEN D604 Unit will only go into FWD plays - all other modesnonfunctional.
ALIGNMENT OF TAPE PATH Found back tension 3.5 gcm and tape path high at pinch rollerand low at head, causing tape wrinkle.
MISSING 2.5MM STEEL BALLS The head deck assy will not move fully into the cassette. Inthe case of the TC-K81, the assy jammed in the cassette case, chippingthe erase head.

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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