I am losing my touch. I've worked on 4 different HV cages over the last few weeks and all the repairs I have done to them are starting to run together. I really should keep a log of EVERY repair I do to EACH HV cage so that I can remember what I have and haven't done. I have 2 of them working finally but the current one I am working on is giving me fits.
The issue is that I can only adjust the HV down to about 21kv. Pin 5 of the HV cage reads 230 volts. The HV unit was rebuilt with new parts and upgraded per the FAQ. Numerous burned resistors and dead transistors were replaced and torn pads were jumpered. Despite going thru the entire cage, I still can't get it to work correctly.
Please take a look at the values for the transistors listed below and see if you can't help me pinpoint where the issue is. Voltage values are all DC voltages (obviously) and are listed in the following order.
Collector Base and Emitter
\
Q900 23.25 18.5 17.9
q901 23.2 18.4 18.3
Q902 18.8 15.62 15.04
Q903 22.86 16.21 15.67
Q904 -15.1 -22.6 -23.24
Q905 22.2 -23.1 -24.0
Q906 17.5 -24.8 -23.7
I have been all over this particular cage and checked the transistors several times along with diodes and resistors. I will move onto the last cage awaiting some help from the gurus out there.
The issue is that I can only adjust the HV down to about 21kv. Pin 5 of the HV cage reads 230 volts. The HV unit was rebuilt with new parts and upgraded per the FAQ. Numerous burned resistors and dead transistors were replaced and torn pads were jumpered. Despite going thru the entire cage, I still can't get it to work correctly.
Please take a look at the values for the transistors listed below and see if you can't help me pinpoint where the issue is. Voltage values are all DC voltages (obviously) and are listed in the following order.
Collector Base and Emitter
\
Q900 23.25 18.5 17.9
q901 23.2 18.4 18.3
Q902 18.8 15.62 15.04
Q903 22.86 16.21 15.67
Q904 -15.1 -22.6 -23.24
Q905 22.2 -23.1 -24.0
Q906 17.5 -24.8 -23.7
I have been all over this particular cage and checked the transistors several times along with diodes and resistors. I will move onto the last cage awaiting some help from the gurus out there.


