Electronics Forum / Repair / September 2006

A customer brought this Digistar model TK1337DP (mfd. Jul '05, not sure of
mfr.) in, their kid was playing with the remote and appears to have locked
the controls. I can power on with the remote, but all other buttons as well
as the front panel will not do anything. A lock icon ...

I have got a power scooter (CTM HS686) for repair and experience a strange
phenomenum. Powering the scooter up works with an ordinary on/off keyswitch,
but the scooter only powers up when the the switch is turned on and then off
immediately. The scooter works fine then. To switch ...

i have an HP6024A power supply.
The unit run ok only with a variac ( instaed of mains line)and with
disconnected Ground(earth) wire.
If i connect the unit direclty at mains line with Ground my  general

Does anyone have a calibration/maint manual for a JDR Instruments model 3500
o'scope? I bought it cheap for my son ($100), he is building his own analog
synth, and it works great, but the focus control no longer brings the trace
into focus when I turn it all the way to the right. ...

I have a zenith VCR and off late I see a thin band which has a
distorted image when I view any videos in the middle of the screen. The
rest of the screen looks fine. I see this happening on all the tapes. I
have changed the cables but still no effect. The audio is fine.

I have a zenith VCR and off late I see a thin band which has a
distorted image when I view any videos in the middle of the screen. The
rest of the screen looks fine. I see this happening on all the tapes. I
have changed the cables but still no effect. The audio is fine.

Hi, anyone has book o manual that shows step by step how use a
sweep/maker and an osciloscope in procedures to alignment an analog TV
transmitter.

I try to repair this monitor that display only a vertical strippe about 1 cm
large.
The 2 HOT transistors  Q5A2 (2SK5294) and Q5A5 (2SA1988) where short;
After replacement, the problem is already there.

I have a combination TV/VCR Toshiba model MV13N3.
I have had it about 2-3 years in my sewing room so there isn't a lot of
wear and tear but when I place a Video in the TV, the audio is present
but not the picture.  What could it be and is it something that I can

There's a spider in my Philips Ambilight TV and it's pissing me
off....I'm scared it's going to damage something or create a web or
whatever.  I have had it on for a few hours hoping to fry it out but to
no avail.  I called Best Buy and they say it won't be covered even

please if somebody can provide the schematic for this tv, it has
following components: LA76814K, D1651,C4237, 24 C04,A786B,LA4225 and
the last IC which I can read in the upper part HAIER-US.1  5T03
OMD6   and I dont what it is or what  IC is.

Has anyone repaired the problem with the Dell P780 D99 chassis that
turns on with High Voltage but shuts down with the amber LED flashing.
Or is this still a mystery to everyone?  I have one that I'm trying to
repair, but I cannot get anywhere with it!  I've tried searching google

my toshiba 34-inch CH7 make an anoying "electric" bzzz sound (like that
of a transformator). I can hear it when the sound muted (or if ther's
silence in the show played) or when I change channels in my cable
descrambler. it gets  lowder when I rise contras or change cable

I posted this question several days ago, and would like confirmation on
the part #'s if anyone can help. Zenith model #B27A30ZC5. The parts ID
as printed on chassis is CX3210, CX3212. Both located in the horizontal
section. Both were burnt. Thanks one more time group.

Hello group,
I have got an transformer which is "gone" but without a output rating
printed on.
It is ;