Dicas Reparação




Modelo - Chassis KV2602


Pesquisa: KV2602 Enviar Dica Resolvida
Resultados 15
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MarcaModelo
(Chassis)
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SonyKV2602
POSSIBLE MODIFICATION OF EXISTING CIRCUITRY Picture brightness varies with program content/material(random intermittently). Maybe weak sync tips/levels (only on cablechannel 25 scrambled cable channel), request permission to modifycircuitry only if advised by engineering. Also magenta bar on the
SonyKV2602
CABLE TV SCRAMBLING Approx. 20 customers in St. Louis with KV-2602encing dark picture with color smear and predominant red chroma on cableTV. They were scrambling all channels. The system used is mfg by Jerroldand is similar if not the same as the equipment outlined in th
SonyKV2602
POOR VERTICAL LOCK, R580 With a change on screen from bright to dark would cause unitto loose vertical sync. With a bright scene no problem would be observed.Checking input/output of sync sep (Q507) transistor noticed that the syncwas lost when a low brightness scene was on scr
SonyKV2602
BLOWS FUSE AT TURN ON, REPLACED THP601 AND FUSE At turn on F601 fuse blows out.
SonyKV2602
ONLY TUNES LOW CHANNELS, REPLACED NON SONY Q008 VC voltage at tuner would only go up to 10VDC.
SonyKV2602
VERTICAL DISTORTION, REPLACE C516 This unit would play for approx. 20 minutes with no problem.After the circuit had sufficiently heated up the vertical would start tocollapse until there was only about 1/2 inches of deflection. We foundC516 to be defective. Monitoring the resistance ac
SonyKV2602
AUDIO BUZZ ON SCRAMBLED STATIONS, ADJ SIF T204 AND T205 Audio buzz on scrambled stations only (HBO & Cinemax).
SonyKV2602
RETRACE LINES IN THE PICTURE, REPLACED L503 Retrace lines in picture.
SonyKV2602
INTERMITTENT SHUT DOWN, REPLACED CRACKED HVR BLOCK This unit would intermittently shut down. The HVR block had acrack across the bottom.
SonyKV2602
INTERMITTENT SHUT DOWN, REPLACED IC501, D501, Q501, T502 Intermittently goes into HV shut down. Changed IC501, D501,Q501, T502. Also reduced the value of R572 to satisfy the adj. procedure. -HQ COMMENTS: Probably this type of shut down is caused by defective HVRblock. The 15.2 +/- 0.1V specified in adjustm
SonyKV2602
PICTURE DISTORTION, REPLACED C508 At turn on full vertical sweep then gradual loss from top andbottom until after 5 minutes picture would be approx. half size.
SonyKV2602
PICTURE BLANKING, ADJ JERROLD CABLE BOX, VARI-LOSER When using models with 30P chassis on cable systems thatscramble the pay channels (by removing the sync pulses at the head end andreinserting them thru a converter) the sync is sometimes compressed tooclose to blanking. This apparently reacts with the k
SonyKV2602
DEAD, REPLACED Q601, D501, B RECT, ETC Set dead. No sound, no picture. Found defective the follow-ing parts: bridge rect. power module, Q601 transistor, D501 zener diode,and 5 amp fuse.
SonyKV2602
VERTICAL JITTER, REPLACED C511 After 5 to 10 minutes on, vertical jitter is noticed andbecomes increasingly severe. Sometimes a brighter line is apparent acrosscenter of screen (slight folding). Found C511 2.2ufd at 20V tantalumcapacitor very slightly leaky (100k).
SonyKV2602
VERTICAL FOLDOVER, REPLACED IC502 Vertical foldover at bottom. All voltages around IC501 andIC502 checked good except Pin 5 of IC502 which was very low, waveformswere distorted.


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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