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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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an elementary question about lamps
On a halogen lamp the dimmer assembly was it seems
to me a lot of electronics -3 diode and a transistor. What's this stuff all about. Naturally it's gone south (else why else would I be here). I'd love a complete replacement but there are phyical restraints. So 1. Where might I be likely to find a replacement. 2. If failure on 1., it is the trnsistor that is gone (took a trace but that is a non-problem). The stuff on the transistor is: 600F BT138F PHm42 Any info/help would be most appreciated---Thanks |
#2
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an elementary question about lamps
"Leo Tick" wrote in message ... On a halogen lamp the dimmer assembly was it seems to me a lot of electronics -3 diode and a transistor. What's this stuff all about. Naturally it's gone south (else why else would I be here). I'd love a complete replacement but there are phyical restraints. So 1. Where might I be likely to find a replacement. 2. If failure on 1., it is the trnsistor that is gone (took a trace but that is a non-problem). The stuff on the transistor is: 600F BT138F PHm42 Any info/help would be most appreciated---Thanks Try http://tinyurl.com/iwks Jc |
#3
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an elementary question about lamps
"Leo Tick" wrote in message ... On a halogen lamp the dimmer assembly was it seems to me a lot of electronics -3 diode and a transistor. What's this stuff all about. Naturally it's gone south (else why else would I be here). I'd love a complete replacement but there are phyical restraints. So 1. Where might I be likely to find a replacement. 2. If failure on 1., it is the trnsistor that is gone (took a trace but that is a non-problem). The stuff on the transistor is: 600F BT138F PHm42 That's not a transistor, it's a triac. (basically an AC thyristor) The relevent numbers are BT138F and 600F, the latter being the max voltage. I'm not sure why you think 4 components is a lot, that's actually a very simple dimmer. What exactly is wrong with it? The usual components to fail on dimmers are the triac and the potentiometer. Triacs usually fail short circuit, (the light will stay on all the time) and pots fail open or intermittant. The latter is a simple check with a multimeter. Unless all 3 of the remaining devices are clearly diodes, one of them is likely to be a diac, which aren't simple to check. Dave |
#4
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an elementary question about lamps
Perhaps this is what you're looking for:
http://www.pointshop.com/Mall/Catalo...000018611.html Leo Tick wrote: On a halogen lamp the dimmer assembly was it seems to me a lot of electronics -3 diode and a transistor. What's this stuff all about. Naturally it's gone south (else why else would I be here). I'd love a complete replacement but there are phyical restraints. So 1. Where might I be likely to find a replacement. 2. If failure on 1., it is the trnsistor that is gone (took a trace but that is a non-problem). The stuff on the transistor is: 600F BT138F PHm42 Any info/help would be most appreciated---Thanks -- Bennett J. Price, Ph.D. |
#5
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an elementary question about lamps
I want to thank everyone for taking the time to respond.
It's been a long time since I did any electronics repair--PDP11 was the last. As tt whether it mailed open or claset I could say opeb but that would be misleading since a trace from the triac melted so In my ignorance I would say the triac shorted. If I could find a replacement I would prefer that but the physical constraints are great. It is an expensive lamp fixture so I have no problem replacing any and all components and repairing the trace. The marks on the circuit board are the usual diode symbol two have a black with the usual diode markings and the third is the "glassy" kind. Ther is also ine resistor an a cap. I'll try the URL's suggesteed and if tis fails I'll replace the trac. For the moment I only have a digi-key catalog which shows logic triacs and gated ones and alteernistor triacs The numers dont match but this may be a japanese kind of numbers. The thing was made in tiwan, thanks again |
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