Repair

9v battery terminal blanks?
I want to keep some NiMH rechargeable 9v batteries in my tool bag (well, my meter bag, actually). I am currently running a double loop of electrical tape around the entire battery to insulate the terminals. I'd like to use something more durable (one battery has had a terminal peek through the tape) and was t... 21 Dec 2008 17:58

Viewsonic VG150 logic board 0171-2242-0153 3150-0122-0150 repair help
On Mon, 15 Dec 2008 09:03:53 -0800 (PST), Boyan <bbiandov(a)gmail.com> put finger to keyboard and composed: Thanks Joe However the power supply in those monitors is external, and in this case I have lost the oriinal power supply long time ago and I am feeding the monitor perfect power from my Lambda lab sup... 16 Dec 2008 01:03

Firmware for Tektronix 496 or 492 Analyzer (Ser.Nr. B030000& UP)
Andreas ha scritto: Hello, my Tektronix 496 Spectrumanalyzer suddenly doesn't make any digitally work, some key-LED's light and a very slow analog sweep can be seen on the screen. After looking at the servicmanual and testing the 6800-prozessor good i have start the internal self-test by setting the ... 15 Dec 2008 15:35

Update - Hitachi model 50V500 pink picture
Thanks again to all responses to original post. I got the TV today, and got into the service menu - I2C menu. Accessed by pressing and holding input on front panel and power button for 2 seconds. Selected "memory init". Screen immediately went to normal color (pink screen color gone). So far I don't see where I hav... 15 Dec 2008 13:13

B&O TV AVANT 100Hz
This Avant 100 Hz Chassis 83/00 is giving me a headache. It is hardly to service due to the complexity of wiring interconnecting all the different PCB's. The problem is very simple: Set switches on flawlessly There is Sound, and programs can be selected, but: There is no video picture The CRT shows a blank raste... 23 Dec 2008 17:56

SMPS: I'm Topologically Challenged
Hi, I'm in need of a pointer to a couple of representative circuits so that I can get my brain around the particular configuration used in the SMPS I'm working on. It is a Boschert OEM type (XL131-3604E, HP 0950-1879) used in an HP54502 DSO. Before I accidentally blew the switching transistor, it would only work... 16 Dec 2008 06:43

Speaker surround re-foaming - any recommended or not-recommended suppliers?
I've got a few pairs of speakers I need to replace the foam surround on. I have found a bunch of places with widely different prices. Does anyone here have experience with these or others. I am curious about the quality/durability of their products. Are the expensive ones worth the price difference? http://spe... 11 Dec 2008 19:44

Incomprehensible industrial schematic
This is a partial wiring diagram for an early 80's (West) German guillotine paper cutter: <http://freefilehosting.net/show/42l0i> The goal of this circuit is to energize an electromagnetic clutch coil (m27) that takes rotational energy from a flywheel to do a task (bring down the knife blade). This circuit ... 13 Dec 2008 17:43

Matsui LM19W1 (stuck in standby)
On 8 dic, 11:21, "Arfa Daily" <arfa.da...(a)ntlworld.com> wrote: Thing is, the stuff is so cheap now that it's hardly worth worrying about service once the warranty is out. I was looking just the other day at a 22" fully featured LCD TV for my newly remodelled kitchen. Built in Freeview receiver, HD, 1000:1 ... 8 Dec 2008 21:08

Old analog meters
Started collecting them pretty recently - Weston, Eico, Precision Apparatus, etc. Even a Japanese JRC vom from about 1950. Wondering what cool old meters you guys have at work or at home? Care to share thoughts / reminiscences? Mark Z. ... 11 Dec 2008 04:27