Electronics Forum / Repair / July 2005

i am a bit confused about contact cleaner.
what does contact cleaner do to electrical surfaces?
how does it clean connector edges better than just wiping them off with
a rag?

I found the two power supply transistors, the 2SC4834's, Q601 and Q602
shorted, and the HOT  Q502, the 2SC5148 shorted also. The fuse resistor
R607 was open as well. I pulled VDR601 and did not read any leakage
through it but I am leaning toward replacing it and the four

Just got for free a super Sony KV 2032 ME television, in pristine
(outside) condition but I have a little problem...
This is an early 80's model with an excellent receiver, brilliant tube
(one of the first Trinitrons) and SECAM support, to play back some of

I'm trying to find the equivalent of two NEC power transistors, it's a
NEC 2SD188A and a NEC 2SB545A.
I need some technical info of those transistors or datasheet? I have
Sasnui receiver and one channel doesn't work. Thanks in advance! Best

To those with experience servicing these....I have just obtained a couple of
the older variety with the 5 spinning wheels (lucky lines and lucky hearts
if that matters), both with the same problem. A couple of seconds after it's
switched on all the wheels begin rotating and don't ...

Is ther any way to tone down the volume?

Has any one seen commercial implementations of using LCD shutter to
replace the mechanical color-wheel in projection engines based on
sequential color?
Are any manufacturers going this route? I've read some papers about

Got an old Kenwood tuner model KT-42B. After using it for severals
hours, it won't turn on again. Only one of the 'memory' LEDs lights up
but the flourescent display is off. Tried to resolder every joint
possible. Reseated the socketed IC near the flourescent display, stil

Looking for advice on how to join two lengths of electronic ribbon or
tape cable of the same size, width, etc. This is the kind of unshielded
cable with copper stripes on one side in an orange-brown plastic.
Having had a some DIY experience repairing desktop PCs and cobbling

   I have a Toshiba TV  27AF41, ch TAC0114 (mfg 12/01) (Photofact 4577)
in my shop.  I don't have SM.   When you try to turn on the TV, it goes on for
a fraction of a second then off.  Then the front panel LED starts blinking.
I was able to see (scope) a flyback pulse briefly (used ...

I've read a lot about projection technologies for rear and front
projection televisions. Has anyone seen a commercial implementation of
a two panel LCD/DMD/LCOS projection engine?
I've only see 3 panels and 1 panel with color-wheel.

Anyone know if the common LORAN sets found in many small aircraft are
readily useable in boats?
I have no idea what voltage small planes use.  Most boats have 12v available
to hook to.

This problem just started the other day, I am not sure what it is.
It only happens when the cable tv is used  (not dvd etc).
Nothing has been changed on the system, any idea how to fix this?
Thanks

I got a sony CPD-E220 Monitor.You might know sony doesn't even car
on crt monitors.My monitor does'nt work,when it boots it shuts dow
itself(tik sound heared) and the led changes to amber.so i took to
service center,they told the Eprom has been corrupted(even checked wit

I am a retired broadcast engineer and I could do with some help,my
daughter is coming home from uni with a duff amp.symptoms  one side
lost o/p then other side any help would be much appreciated
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