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Hantarex MTC 9000 image squashed vertically
be77amyX:
Is that measuring from the power plug with everything connected?
grantspain:
i read the u250 completely unplugged except mains input of course but you can read under load- it makes no real difference on these psu
be77amyX:
I get 165Vdc with the power supply disconnected, 152Vdc with the chassis connected but the yoke disconnected. The when I connect the yoke I get 132vDC at the power connector, 127vDC at SP3 and 115vDC at SP4 and beyond. Do you think my power supply could be the issue?
grantspain:
impossible to say without looking at the chassis, the regulation circuit should sort out any issues but 165 from the u250 sounds high too me. i have seen them at 150 before and work fine
maybe you should think about servicing the u250 although i do not believe this to be the issue- might be might not, i doubt it though
be77amyX:
Stripped out the power supply. nothing obvious wrong inside. hooked it up to a 60w light bulb and getting 137Vdc out so looks good! still only getting 115vDC on sp4 with it all hooked up although I can get it to 122 if I play with the 5v adjust on the power supply. doesn't seem to affect the picture though! Also I've checked everything in the regulator circuit apart from TR21, TR22 and ZD3 so I need to do them but haven't seem them mentioned in any forum posts about fixing these things!