TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	RS20	Defective q901	When switching s502 from out to in position and pressing c601for ogm recording stand-by, this unit rewinds the tape halfway, fastforwards, forwards, and then stops. when pressing s601 again to recordogm, the alarm beep comes on, and it does not record o
SONY	PSFL1	Worn rack and gear	When attempting to operate turntable drawer, a loud clickingcould be heard. inspection of the rack and gear revealed the rack haddamage on the first tooth, and the gear also appeared damaged.
SONY	M102	Motor would not fit	I found the mounting bracket to be incorrect in size and holespacing. kc told me that i was wrong and that the motor should work.they suggested that i reorder a motor, which i did, and this one came inwith the same problem. -hq comments: motor mounting
SONY	CDP101	Defective cx193	Disc motor spins backwards on start-up and then reverses tonormal drive. no kick start and only 1.5 vdc b+ at chip instead of 5 vdc.failure to accept disc after warm-up. vcd + focus bias out of adjustment.
SONY	CDP101	Defective kss-100a	Skip of program material at random. full and accuratealignment had no affect. acquisition time is excessive and unit isvibration sensitive.
SONY	XR25	Incorrect mounting of fader	Unit came in with no sound, amp chip was replaced. foundfader control was mounted 180 degrees which caused the pins on the controlto short to chassis. remounted fader control.
SONY	WM4	Battery shorts	Not operating on batteries.
SONY	TAAX4	Error in manual	On schematic, page 27, and in unit, the capacitor for c905has a value of 0.82 uf at 250 volts. on page 34, in the parts list thevalue listed is 1.2 uf at 250 volts, the part number is shaded becausethis part is critical to the power supply section. -hq
SONY	STRVX750	Ic301 need to be replaced	In reference to t/n #8512, this str-vx750 has the former ic301(8502) which causes the problem that had been thought to only occur inthe early production (806,000) str-vx550.
SONY	STRVX550	Amp overheats	When using amp on a 4Ω load after 5 to 7 minutes powerchip will overheat and short. this is at 50 watts which is the spec. onthe service manual. on 8Ω load at 50 watts, power chip runs extremelyhot, also. -hq comments: we ran our unit into a 4 o
SONY	STRVX6	Leaky p405	Ones digit of the display always shows 0 or 8. checkedthe waveform at pin 18 of ic401 (u-com) of this unit and the good unit(s/n 804552) as shown below.
SONY	STRVX4	Replacement transistors fail	The 2sc-1826 or 2sc-1986 is used as a regulator in the abovelisted models. when these parts fail and the part 8-729-398-62 is orderedthe part is subbed to a 2sc-2768. -hq comments: 2sc1986 (8-729-398-62) does not sub into a 2sc2768 atkcp. however the
SONY	STRV45	Defective q310	Hum comes and goes.
SONY	STP7	Defective ic603 and fd701	This unit would not tune or display the proper characters.we found the upc and display to be defective.
SONY	SRF70W	Defective tuning cap	When tuning to high end am at one point about 1000 khz, amwould sound like it shut off.
SONY	PSLX5	Intermittent switch	The tone arm would go into 45 disc position instead of droppoint for 33 size. only at first cycle, then no more failures.
SONY	ICFC55W	Open foil trace	Clock runs fast 8 minutes per hour.
SONY	HMK313	Poor connection at r605	No right channel output. found poor connection at r605.
SONY	FH7	Worn driving gear	Upon investigation it appears that gear and fwd cam isstopping at an incorrect position allowing it to wear hub of driving gear.
SONY	CFS45	Proper screws needed	Since the latest (metal type) carrying handle side pieces havebecome available, i have had difficulty finding a usable screw type whichthreads properly into the also new threaded holes in these parts.