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HP141T Repair
I got a HP141T with 8554B and 8552B plugins.
After replacing some transistors and fuses in the powersupply, I decided on a careful power up with a Variac There is some light on the CRT and a horizontal sweep at the top of the screen (I suppose the picture is out of alignment because of the incorrect voltages) It turns out that the ribbon cable to the CRT anode and storage electrodes is split open and arching between 2 wires, even without the full mains power applied. Any suggestings on: Where to get a new cable? How to repair them? How to remove the CRT, as this is not mentioned in the service manual I downloaded from BAMA. Thanks in advance, Wim |
#2
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Wim Ton wrote:
I got a HP141T with 8554B and 8552B plugins. After replacing some transistors and fuses in the powersupply, I decided on a careful power up with a Variac There is some light on the CRT and a horizontal sweep at the top of the screen (I suppose the picture is out of alignment because of the incorrect voltages) It turns out that the ribbon cable to the CRT anode and storage electrodes is split open and arching between 2 wires, even without the full mains power applied. Any suggestings on: Where to get a new cable? How to repair them? How to remove the CRT, as this is not mentioned in the service manual I downloaded from BAMA. Thanks in advance, Wim I think your chances of a new cable would be zero - and if you did, it would be as old as the original one in there. I suggest you cut out the old cable, and replace with a salvaged length from a scrap monitor/tv set etc. Carefully heat shrink your connections, and cable tie the sections clear of grounds. There is only a few KV there (its a relatively small tube) so flashover shouldnt be a problem. The out of vertical alignment trace could be another issue - but hey, lets deal with the smoke and flames first hi hi 73 de VK3BFA Andrew |
#3
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Wim Ton wrote:
Any suggestings on: Where to get a new cable? http://www.glkinst.com/cables/hp_cables.htm That was the first hit on a Google search of HP 141T cables Roy Lewallen, W7EL |
#4
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"Roy Lewallen" wrote in message ... Wim Ton wrote: Any suggestings on: Where to get a new cable? http://www.glkinst.com/cables/hp_cables.htm That was the first hit on a Google search of HP 141T cables Roy Lewallen, W7EL Thanks for the link! May come in handy when I have repaired the thing and found an affordabe tracking generator. Wim |
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