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Main => Monitor/Video Forum => Topic started by: AE35 on May 25, 2011, 04:06:09 pm

Title: Hantarex 900E problems
Post by: AE35 on May 25, 2011, 04:06:09 pm

Hey all!

After changing all the caps on the Hanty 900E chassis, all seemed pretty well.
I let the game run for some time, then the picture became fuzzy, and got really
really small, and then was gone.
 
When turned on again there's only a DRDRDRDRDRDR sound from the chassis. No light
in the tube. Is this the flyback then?

I'm still able to discharge the monitro afterwards, so something must reach it..but no light in the tube neck
 
Any advice? :)
 
Thanks!

Nicholas

Title: Re: Hantarex 900E problems
Post by: grantspain on May 25, 2011, 04:26:56 pm

double check all the caps are correct value and not reversed polarity

Title: Re: Hantarex 900E problems
Post by: AE35 on May 25, 2011, 05:04:25 pm

Hey!

Thanks! But they're all ok:)

Title: Re: Hantarex 900E problems
Post by: AE35 on May 25, 2011, 08:21:19 pm

The 220ohm large resistor by the fuses become very hot. It's still in spec though!

Something begins to smell burned from the chassis. :(

Title: Re: Hantarex 900E problems
Post by: lilshawn on May 25, 2011, 11:39:34 pm

Quote from: grantspain on May 25, 2011, 04:26:56 pm

double check all the caps are correct value and not reversed polarity

triple check polarity... sometimes the silkscreened diagrams on the board indicating the caps polarity can be wrong... or be oddball (dark hemisphere is positive where usually it's neg)

Title: Re: Hantarex 900E problems
Post by: AE35 on May 26, 2011, 08:06:31 am

I checked the B+ voltage, it's 180V   :(

Title: Re: Hantarex 900E problems
Post by: lilshawn on May 26, 2011, 09:21:44 am

Is it high?? Sorry I don't have the spec on me. If so maybe someone turned it up to compensate for dry caps loading it down... Then after you changed them the excess volts fried the HOT?

Just a theory... Its happened to me before.

Title: Re: Hantarex 900E problems
Post by: AE35 on May 26, 2011, 09:44:49 am

I think it's supposed to be 130V....actually your theory was what I thought about too...

Is that the pot near the large 220ohm resistor, opposite end of the fuses?

...and can I test it with a multimeter?

Thanks!

Title: Re: Hantarex 900E problems
Post by: Ken Layton on May 28, 2011, 01:09:55 am

Of course you read my repair guide?

http://home.comcast.net/~mtpacifico/_kenskorner/files/Hantarex_MTC900E_repair_guide.pdf (http://home.comcast.net/~mtpacifico/_kenskorner/files/Hantarex_MTC900E_repair_guide.pdf)

Title: Re: Hantarex 900E problems
Post by: AE35 on May 28, 2011, 03:31:56 am

Hey Ken

I can't really see where the guide is on the .pdf? It's just a list of caps and some information
about parts?

Title: Re: Hantarex 900E problems
Post by: Ken Layton on May 29, 2011, 01:43:15 pm

That vertical output IC is a known troublesome part that shorts and causes power supply problems.