Repair

Wiring stereo jack directly to IC?
I have an old stereo system that I'd like to keep using and I'd like to try to add a line-in jack for plugging in an MP3 player or connecting audio from a computer. I found the service repair manual, and it looks like the cassette, tuner, and CD all go to this one IC - LC75392 (http://datasheetcatalog.com/datasheet... 12 Jan 2010 08:09

Agilent E4411B flash upgrade
I would like to upgrade the size of the flash memory in an Agilent E4411B spectrum analyzer because the upgrade (from 8MB to 16MB) is required for the current firmware. The upgrade involves replacing the 4MB flash SIMM with a 12MB SIMM. It's option B72, Agilent part number E4401-60081. It is available from Ag... 4 Feb 2010 19:07

HP 54201A scope input failure
Just picked up an HP 54201A digital scope. It basically works but both input channels are dead. Will not recognize any inputs, and the input self test fails. Don't have a service manual (and have been unable to download one...on dial up here), and don't want to pay a bunch of $$$'s for one to find out the hybrid ci... 8 Jan 2010 15:04

Toshiba DLP no picture 62HM84 4434ZA board problem
Hi , having this Toshiba DLP TV with a problem with the 4434ZA ballast power supply board that provide the power to the lamp. R3 is open (1 K resistor). Seems to be a feedback resistor. Can I only replace it ? I saw on a few post that this is a common problem and maybe a bulletin has been done for this. ... 8 Jan 2010 09:24

ALDI UV Toothbrush sterilizer (Eprom Eraser).
Was in Aldi today, and among their current weekly specials is a UV toothbrush sterilizer for around $16. Opened one up, had a 1.5" approx U shaped germicidal tube inside, 240v operated. Great for those who posted a couple of months back looking for a cheap way to erase EPROMS. ... 18 Jan 2010 08:38

W.E. 8a amplifier
Does anybody know where I might get a copy of the circuit diagram of a Western Electric 8a amplifier? These were used to drive the cutterheads in early electrical recording systems and I particularly need to find out what switchable bass-cut facilities were fitted as standard. -- ~ Adrian Tuddenham ~ (Rem... 7 Jan 2010 11:18

Help. Mitsubishi WT-46809 Need help reseting to factor settings
On Jan 6, 6:01 am, "Michael Kennedy" <m...(a)nospam.com> wrote: "Ronald" <rcoo...(a)buckeye-express.com> wrote in message news:3a5be3ae-5da6-492a-90c0-c070c139629d(a)k19g2000yqc.googlegroups.com... I was trying to set my TV into 1080i mode in the service menu and it shut off now it won't turn back on.  T... 9 Jan 2010 17:24

HK Audio Actor / Lucas power amps , generic problem?
They have an otherwise original assembly method of the final contact to the pins of TO3 power transistors by 2 zero ohm "resistor" links, so 2 current paths to the pcb traces. Anyone else observed bad solder joints to these links on the pcb? and cause? believed conventional solder not PbF ... 9 Jan 2010 07:27

Sony DA5000ES surround receiver help please
Happy New Year everyone, A friend brought over a SONY DA5000ES surround receiver where the owner had shorted speaker leads and blown a channel. He (my friend, not the owner)had replaced the 4 output devices in the channel (Q1671,1681, and 2 others that I can't see with the unit assembled.) sourcing the outpu... 6 Jan 2010 09:18

Stanley Garage Door Opener Beam Sensor Components
jpaulson14 had written this in response to http://www.thestuccocompany.com/maintenance/Stanley-Garage-Door-Opener-Beam-Sensor-Components-131299-.htm : Hello, I have the same Stanley 49522 Photo Eye beam sensor assembly, but the pins have rusted and broken off of the photo transistor, so it is no longer usable... 3 Jan 2010 22:41