Electronics Forum / Repair / April 2007

Buy a bunch of old radio books for a few bucks:
3 Radio Books Lot #10 1940's
Winning bid:    US $8.99
Ended:    Apr-04-07 18:25:01 PDT

I can't find an owner's manual online for craftsman garage door opener
139.53335SRT3.  It used to open from the remotes and the wall mounted
switch.  Now if the wall button is used, the remotes won't close it.
The remote sometimes closes it after opening from the wall but then

All,
The gear has a dial with a small, striped allen screw. The tool is 1.5
mm. Any thoughts on how to get this off?
Thanks - Dan

Hello All, I have been gifted this item brand new and boxed. When it
works its really quite good. I say "When" because everything is very
slow to respond i.e. open/close button sometimes works sometimes
doesnt. The remote control is a real hit and miss job, any button

Model # 32GT660 YX1, chassis # CTC187CN3. Unit had bad connection @
horizontal drive transformer, & horizontal output (BUH517) was
shorted. Replaced with original part, & soldered
the horizontal drive, checked, C4303 smt cap, & R4402 resistor, can't

Fujitsu Model # PDS4209U-B, unit comes on, & switches inputs, has a
raster, & OSD, but has no video, with VGA input it has a very washed
out pix, & can barely be read. I have all the voltages to the in/out
video card. Can't locate service info, or tech support around here.

I don't know much about batteries and I am simply curious about the
regular 12V car battery.
Everytime I go to the store, I see all these batteries labeled with
number of Cold Crankcing Ampere or Cranking Ampere, etc. I understand

I'm repairing a fuse junction circuit from a Motorcycle (12v). The owner
hooked the battery up backward and shorted several diodes on the board. All
diodes have the markings 1D4 XC. I've tried searching to determine what
exactly these are with no luck. Any help would be greatly ...

A first time post for an electronics novice, so here goes:
I am helping a non-profit set up their video camera with two
monitors.  The camera is 10feet away from one monitor and 50ft away
from another.  They are using the camera to show closeups of a cooking

A couple people were moving my 154-lb Sony 30-inch 16:9 CRT  to
another residence and it got dropped a couple feet, hitting the guy's
foot to "cushion" one side of it. It fell on the heavy front side of
course. Minor cabinet scratches. It powers on, receives  OTA stuff

Taking apart an old CDI ignition system to revive it, am having
trouble ID'ing a Fujitsu 14-pin DIP.
PN is MB4213
Any help much appreciated

  About three years ago I lost everything on my Sony 27 in., Model KV27S26,
replaced HOT , two transistors and a Fuseistor , everything is still OK , my
sister has almost the same model 27 in. Sony and she lost the picture but
has audio and Ch. change , her husband called me and ...

What is the white deposit chemically, is it always white, and why does it
always form on the dome end whichever-way-up the valve is mounted.
--
Diverse Devices, Southampton, England

Hi, everyone.
Can anyone point me in the direction of the specifications for Subject
instrument.  I've just refurbished one that I rescued from the
dumpster, but I'm not sure over what frequency range it works - checks

Looking for a repair manual for a LJ 970cxi.  A small metal cylinder
about 1/4" in diameter, 1" long fell out of it and I have no idea where
it goes or what it is for....
Thanks