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Old 8th Feb 2019, 9:29 am   #1
tonyvirago
Diode
 
Join Date: Nov 2016
Location: Haslingden, Lancashire, UK.
Posts: 3
Default HP T141 Display section repair

I have repaired my unit a few times over the 2 or 3 years of ownership. Usual fault is...no display.
Beam finder is inop when spec analyser modules are installed.
Unit is easy to work on.
1) power supply rail fail. Check non-std value resistors around volts setting pot (why have a potential divider using funny sizes, then have a pot in the middle?)
I have replaced R's in x2 supplies here.

2) The EHT 6.6kv and x2 low voltage "mesh" voltages get to the very front of the CRT on a 3 strip flexy strip. the EHT goes wild after 30-40 yrs on here. I bodged up the EHT with a thin silicone wire which worked for a while, but left the strip in situ. A year or so later, same issues. I removed the strip and replaced the conductors with thin quality wire. I insulated them as thick as possible but there is little room to get from the front of the CRT back into the case (prob why its a flexy in the first place). Rubber boot over the edge of the front of th CRT is tricky to keep in place when sliding the CRT back in after repair. (you can slide it out an couple of inches still with the base connections on) I cleaned up and lightly glued the rubber shroud in place.

Got is working again NO more living in the shed for this beastie. See photos. Tony G4NGV.
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