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starlight9088

Member Since 05 Aug 2013
Offline Last Active Dec 10 2013 08:27 AM
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Posts I've Made

In Topic: XTi4000 Not Working

09 December 2013 - 04:50 PM

FAO Alain (and anyone elso who could help!)

Firstly thanks for all of your help so far..

A little time has passed since i last posted and I have since passed the Amplifier into the hands of a professional!  He is in the process of getting validated onto here but until then I will post his results and findings.

The unit was powered up.  After which Q47, (IRF260N) popped. This was replaced along with it's companion diode D35, as were C196, C275 & C193.

C201, C186 & C188 all measure ok as do these resistors:
8x  47.8KΩ, 1 Watt, 1% resistors
2x  35.7KΩ, 1 Watt, 1% resistors

The 16V zener at the R375 junction is OK too.

All the IGBT devices are ok (not short)

all that happens now on power-up is the device
RT6X gets hot very quickly!



Thanks in advance for any replies.

In Topic: XTi4000 Not Working

09 December 2013 - 04:14 PM

dos anyone know how to add someone into this conversation that is a member, but has a 'validating' status? Or, can anyone out there validate him?  (NoizyGeoff)

In Topic: XTi4000 Not Working

09 September 2013 - 01:29 PM


Hi Alain.


I have replaced the kickstart cap C196.  Sadly this didnt fix it either :(


I have also removed R375 and tested the voltage at U16 pin 1.  The result I got is 37.6Vdc

(250v UK power supply)


Thanks.


Andrew

In Topic: XTi4000 Not Working

05 September 2013 - 12:40 PM

Great, I will try that.  Do you mean 220uF? that is what C196 is labelled as.

In Topic: XTi4000 Not Working

05 September 2013 - 11:02 AM

The resistors are in and ive checked them against the circuit diagram, etc.  

The voltage reading i get between the R375 junction and TP21 is steady at 6.3vdc?!?!