TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TAM50	Unit will not set up to take messages - get error beeps	Unit will not set up to take messages when answer button ispressed. sometimes you can record the ogm, but when the unit tries torewind the tape, you get the error beeps.
SONY	TAM30	Unit will not set up to take messages - get error beeps	Unit will not set up to take messages when answer button ispressed. sometimes you can record the ogm, but when the unit tries torewind the tape, you get the error beeps.
SONY	CDXR77	Cd only plays when unit is turned upside down	Cd only plays when unit is turned upside down.
SONY	STRAV1020	Silkscreen for ic-251 printed on board wrong	Silkscreen printed on video board for ic-251 on video board isbackwards (ie. 180 degrees). pin 1 on ic actually corresponds to pin 9on the board.
SONY	PSLX520	Intermittent speed	After refering to sdis, and noting a similar problem with thiscircuit i checked r-107 and r-106. r-106 was a 390k resistor r-107 was a1.6k resistor.
SONY	SLV757	Does not respond to controls	Won't eject, power down.
SONY	STRAV1020	Protection circuit activated	Protection flashes on front display. q-719 (relay drive)shuts off de-energizing ry-701. thus opening the signal path to speakers.
SONY	CFDD73	Intermittent skipping / track jumping	Unit would intermittently skip and sometimes would not ams.upon monitoring sled motor drive voltage, found it to be increasing.normally, it is about 0.7v.
SONY	CFD455	Intermittent skipping / track jumping	Unit would intermittently skip and sometimes would not ams.upon monitoring sled motor drive voltage, found it to be increasing.normally, it is about 0.7v.
SONY	CFD454	Intermittent skipping / track jumping	Unit would intermittently skip and sometimes would not ams.upon monitoring sled motor drive voltage, found it to be increasing.normally, it is about 0.7v.
SONY	XR6180	Tape deck will not function or will function incorrectly	Have seen several units so far where both q-405 and the amsplunger were defective. the plunger was actually melted. i am unsurewhether the plunger or the drive transistor originally caused theproblem.
SONY	SLHFT7	Popping in beta hifi	Popping sound in beta hifi.
SONY	SLHF1000	No beta hi-fi record	No beta hi-fi record. playback or pre-recorded material ok.all voltages ok on ic-004. missing switching voltages at pin 44 ic-003.found open foil between q-610 and d-606. simulated shorted transistor.
SONY	KPR46DX10	Snowy picture on main screen when in aux, customers fault	Customer was complaining that when they hit aux they only hadpicture on the child screen, with snow on the parent screen. -hq comments: found that they were using a vcr, and cable box in linewith the converter and aux. terminals. with the vcr connecte
SONY	DTC75ES	Test tape ty7252	Recommended test equipment list for dat specifies a ty7251test tape for tracking. dtc-75es manual calls for a ty7252. are theyinterchangeable? -hq comments: i will have to check with tokyo. i suspect that there isa typo in the dtc-75es service manual
SONY	SPP320	Intermittent ringing	The handset would only ring sometimes. in addition, thehandset would intermittently not beep when keys were pressed. flexing thehandset main pcb would cause the ringer to function.
SONY	CCDF70	Incorrect slow motion operation	Slow motion operation erratic.
SONY	KV2726R	Set in sleep mode at turn-on, replace ic-101 controller	When set was turned on, it was in the sleep mode per non-authorized servicer. after several checks, found pin 15 of ic-102(memory) to read zero volts. isolated pin 15 and 5 volts would appear onthe 5 volt line. all other readings were good. with pin
SONY	FD2A	Picture looks out of focus, replaced c555	Picture appears as raster only, out of focus. in reality, thesweep is displaced far above the top of the tube due to dc level upsetcaused by shorted c-555.
SONY	FD10A	No horizontal sync, replaced c506	No horizontal sync. ov at pins 17 and 18 of ic-501 causingphase detector inoperation due to shorted c-506 (pin 15, also 0 volts).