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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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hitachi oscilloscope repair
I'm getting out my old projects from the past couple of years to decide
on whether to finish them or pitch them. I found a Hitachi v-1065 scope that I'd like to get running. I'm not sure, but the flyback may be out on it. The hitachi number for the flyback is 8474287-b according to my service manual. There's a fuse (.6A) between 55v and the flyback that blew. When I jumper it, the voltage drops to 25v. Any ideas? The caps, I suspect, maybe have low ESR, so I'm changing them out. I've already ordered a new HOPT, just in case (I have a tendency to ruin those things even when they are still good). -josh |
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" wrote in
oups.com: I'm getting out my old projects from the past couple of years to decide on whether to finish them or pitch them. I found a Hitachi v-1065 scope that I'd like to get running. I'm not sure, but the flyback may be out on it. The hitachi number for the flyback is 8474287-b according to my service manual. There's a fuse (.6A) between 55v and the flyback that blew. When I jumper it, the voltage drops to 25v. Probably the flyback driver XSTR. Maybe associated diodes,too. Any ideas? The caps, I suspect, maybe have low ESR, *LOW* ESR is -desirable-. Caps are bad when their ESR -rises-. I suggest getting a Dick Smith ESR meter,they are GREAT,and low cost,well worth the money. so I'm changing them out. I've already ordered a new HOPT, just in case (I have a tendency to ruin those things even when they are still good). -josh -- Jim Yanik jyanik at kua.net |
#3
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*LOW* ESR is -desirable-. Caps are bad when their ESR -rises-.
That's what I meant... Been a long time since I've worked on electronics! I suggest getting a Dick Smith ESR meter,they are GREAT,and low cost,well worth the money. Already on the list of "gotsta get." -josh |
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