thank you for fast responses. As I wrote in my posting, heating seems to
be ok as reported by the PRS10 diagnostic tools. I agree with Bob and
Paul: RF seems to degrade with warming up, but how can I test this.
Remember, lamp and oscillator of PRS10 are not!!! accessible during
operation and what part of hte oscillator could be the culprit ( and why
do you think it is) ?
Goetz
Am 17.03.2013 20:59, :
My 2 cents and it is that. The FRS use a higher voltage say 24 V and on
ignition that drops back. I have also seen on time-nuts older systems that
actually use an ignition voltage to trigger the lamp.
But I agree that it sounds like the RF might be low. The bulb does need to
be heated to get to the right color temperature also.
On Sun, Mar 17, 2013 at 9:03 AM, Bob Camp <[email protected]> wrote:
Hi
Unless the PRS10 is very unusual in it's operation there are two things to
check early in the debug process:
1) Is the oven heating up to roughly the right temperature?
2) The lamp is lit by RF energy. If the oscillator / amplifier supplying
the RF isn't putting out as much as it should (or what it should) the lamp
will not stay lit.
I'd bet on number 2 in your case. There are many other possibilities, but
I'd check those two first.
Bob
On Mar 17, 2013, at 5:22 AM, Dr. Götz Romahn <[email protected]> wrote:
dear all,
beeing a silent reader of this list for a while, I now ask my first
question.
I have obtained a PRS10 that was declared faulty and it is. The problem
I located in lamp assy.
Lamp ignites only after warming up and pushing by a voltage kick from
abt. 24V to abt 28V on the -24_heat line for some seconds. PRS10 gets
locked there after and rbmon shows a seemingly healthy unit (see
attachment). But... within some 15 to 45 minutes later light from lamp
degrades as seen through "LAMP VIEW" hole in top board as well as AD9
Photocell I/V going down from 1.68 after ignition to 0.158 and lock is lost
of course. Since all heating and voltage diagnostics do stay within
accepted limits I suspect some problem within lamp enclosure (see
attachment). Your help for further diagnosis and any hints for obtaining
spare parts would be appreciated very much.
Cheers Goetz
<PRS10 after
ignition.jpg><lamp-assy.jpg>_______________________________________________
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