Repair

Weird telephone problem
On 7/16/2010 2:54 PM David Nebenzahl spake thus: Anyone familiar with the inner mysteries of the telephone system care to try to 'splain this? How could a phone not work, but still ring on an incoming call? Forgot to mention, in case it's relevant, that they also have DSL, and some of the phones have ... 11 Aug 2010 23:34

Microwave advice
OK, I see there is a long history of microwave over repair questions. But I don't seem to see a thread that has my question: So I have an older GE JVM1190 over-the-stove microwave unit. Symptom is no heat. When powered up and programmed to cook, the unit makes the expected humming noise (the same it's always... 20 Jul 2010 12:28

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Valve/tube, A/R fault
On Jul 15, 10:50 am, Meat Plow <mhyw...(a)yahoo.com> wrote: On Thu, 15 Jul 2010 11:20:03 +0100, N_Cook wrote: Well that is what Avo calls it, I've never come across one before. ECC83 with curious cyclic swirling breaking-surf  whitish-noise and clicks. Putting on Avo 160 tester showed <>short in A/R set... 19 Jul 2010 10:13

Gm auto radio swap problems
I have been trying to do something that used to be so simple but in today's world it seems has become an exercise in futility. I own a 2000 Chevrolet express van which has a factory AM/FM radio installed. I would like to replace it with an equivalent AM/FM/cassette unit. I got the first one from the junk yard, inst... 16 Jul 2010 12:07

Unknown SM 5-pin device.
Greetings, group. I'm trying to identify a surface mount device on some boards I'm repairing, but not having much luck. The device is a small black plastic rectangular surface-mount device, about 1.5mm x 2.5mm in size. The pins are in a 5-pin DIP arrangement (basically a 6-pin DIP with pin 5 missing, leavin... 15 Jul 2010 14:18

Soundcraft Spirit Folio F1 mixer ...
Anyone by any chance got any schematics for this ? I've tried all the usual freebie sources, but without luck. Couple of places are offering them for sale, but owners don't want to spend a lot on the repair, so I'm reluctant to go down that route. Problem is fairly straightforward, and is around the final mixd... 17 Jul 2010 05:32

Diode symbol confusion
on one schematic If a straight bar of cathode and triangle represent a signal diode Same with a small return towards the triangle from the bar represents a zener diode What does the symbol mean with 2 barbs to the bar , one towards the anode and the other in the other direction. In the context of the circuit it c... 15 Jul 2010 13:12

PowerWare 9110 UPS schematic??
I have this UPS that had dead batteries, so I put in fresh new one's all charged up. I plugged it in and red ALARM led lights up, the fan turns on and batteries are being charged up, but it will not turn on, nothing comes out of the outlets. All fuses are OK, nothing appears to be burned. Anyone got any idea... 16 Jul 2010 12:07

Valve/tube, A/R fault
Well that is what Avo calls it, I've never come across one before. ECC83 with curious cyclic swirling breaking-surf whitish-noise and clicks. Putting on Avo 160 tester showed <>short in A/R setting, I've never had before, A/R here stands for cold checking Anodes To Remaining electrodes. DVM cold resistance checki... 16 Jul 2010 05:34