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Lasermad.com • View topic - Help!

Help!


Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Thu Jun 04, 2020 3:45 pm

Re: Help!

Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Thu Jun 04, 2020 4:23 pm

Re: Help!

Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Thu Jun 04, 2020 4:53 pm

Re: Help!

Site Admin

Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Thu Jun 04, 2020 9:07 pm

Re: Help!

The current specified was more of a maximum value to alert anyone seeing 10s of mA to switch off quick. Some meters won't catch the initial inrush either.

Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Wed Jul 29, 2020 4:16 pm

Re: Help!

I mentioned I was having an issue with one of the clocks: two of the 5 nixies fail to light. V2 and V3 fail to light. V1, V4 & V5 light. The clock PCB seems to be ok now: it appears to respond to controls, etc. All the blue & amber LEDs light. The waveforms for the nixies V1, V4 & V5 on their anodes are the same, a rather complex square-wave-ish shape, whereas for V2 and V3 the anode waveform is significantly different, a much more spikey repeating waveform, with no square edges. (NB all of the nixies work.) I measured the waveforms on the nixie PCB, transistors T2,4,6,8 and 10. (In my instance A92 B 331s were supplied.) I am not sure of the pin out, but presume the base is the middle pin. For all of the transistors the waveform on the base pin looks like the same rough square wave. At the pin (collector?) that supplies the anode, the waveforms are the same for the nixies, V1 (ok), V4 (ok) & V5 (ok) yet the "collector" waveforms for V2 (fails) and V3 (fails) are the same as each other, yet different to the working nixies V1, etc. So this seems to me that the two transistors, T4 & T6 are not functioning the same as T2, T8 & T10, as all of the base & "emitter" wave-forms look identical (the "collectors" differ). I have checked all of them for dry-joints (reflowed the solder for all of the joints on the board, twice). I am no export, but might presume, that T4 & T6 are not functioning as required (curiously in a similar manner - most odd). What is your advice? Should they be replaced? (Sadly I have no spares.)

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Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Fri Jul 31, 2020 10:36 am

Re: Help!

Check the anode voltage is reaching the nixie itself, try removing a working tube and comparing the waveform.

Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Sat Aug 01, 2020 12:41 pm

Re: Help!

Site Admin

Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Wed Aug 05, 2020 10:01 pm

Re: Help!

The first thing to eleininate is the LED - the blue LED is in series with the MPSA42 base and can sometimes cause problems. Just bridge it for now to see if there's any change. The high voltages and resistances can make taking readings a bit confusing so replacing suspect transistors is the easiest way to eliminate them.

Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Thu Aug 06, 2020 4:49 pm

Re: Help!

Posts: 51

Joined: Sat Apr 11, 2020 2:45 pm

Post Sat Aug 15, 2020 7:06 pm

Re: Help!

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