Description:
Fixing electronic equipment.
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HP 214B Pulse Generator repair question
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Hello, I've been asked to fix a special piece of lab equipment, a Hewlett-Packard 214B Pulse Generator, dating back from 1980 or thereabouts. The problem is relatively straightforward: a chain of components in the -155V supply has blown: * PCB fuse F602, value unknown * Q601 and Q602 (MJ15003) Since the fuse (F602) has literally exploded, there's no way to determine... more »
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Hakko 472 component values?
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Have a 473 (uses shop air to create vacuum via venturi) and would like to retrofit internal vacuum pump to make it essentially a 472. Have all the guts from 472 and want to stuff empty locations on 472/473 PCB with components to make it 472-compatible. Someone with a 472 be willing to convey a few (about 12) component values to... more »
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Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply Suspect
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Hello, I've tried searching this group and looking for relevant information but nothing really related to the basic troubleshooting I'm doing for my dead Onkyo TX-SV727 Receiver. <i>BACKSTORY</i> The electricity in my house is pretty janky and my stereo may have been shorted out because of that. Basically, my wife... more »
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2D Florescent - 2pin/4pin.
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I have a 4 pin 2D light in the bathroom that flickers for a steadily increasing length of time before starting and shimmers badly when it does eventually start. The local electrical retailer only has 2pin types, which I assume has a built in starter. My question is - can I use a 2pin tube in a 4pin fitting, but not the other... more »
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How best to eval heat risk from AC adaptors
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WHat P=VI values are safe to leave plugged in indefinitely (clock or phone)? I still remember a 1970s Readers Digest on a fire from a 1950s telephone adaptor.. - = - Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist [link] [link]... more »
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