Re: TECH: Battlezone G05-805 monitor question

From: Rodger Boots <rlboots_at_cedar-rapids.net>
Date: Sun Sep 22 2002 - 23:23:25 EDT

Commander Dave wrote:

>Hi all,
>
>Got the cap kit with the transistors, installed, and there wasn't any
>change. Sigh....
>I got the freeze spray back out and if I spray the D904 HV diode a good bit,
>it does shrink the pictures very slightly, but not in frame completely.
>
>My guess is that I blew the new HV diode before I knew not to discharge the
>monitor without resistors (10 x 100K Ohm), so now I am going to replace the
>diode again and see what I get. Before I do, I need to get a sanity check:
>
>1: When installing the HV diode (H1809/H1812), there is a stripe on one end.
>Does that stripe go toward the transformer or toward the cap that goes in
>the tube? On the schematics it has a + side marked toward the tube. I think
>I know, but just want to hear it from one of you guys. I don't feel like
>blowing another one up.
>
>

Stripe goes towards the CRT. If it is backwards it isn't going to hurt
anything, there just won't be a picture and the high voltage will be
negative instead of positive.

>2. I am still looking for verification that swapping an H1812 for a H1809
>will work at all. If not, that might explain why things aren't working out.
>
>3. If anyone has psychic powers, can you tell me where I put my last two
>H1812 diodes??? <grins>
>
>Thanks,
>-Commander Dave
>
>----- Original Message -----
>From: "Commander Dave" <cmdr-dave@spamcop.net>
>To: <vectorlist@synthcom.com>
>Sent: Thursday, September 12, 2002 15:53 PM
>Subject: VECTOR: Battlezone G05-805 monitor blooming problem revisited
>
>
>
>
>>Greetings all,
>>
>>I have a Battlezone mini monitor (Electrohome G05-805 15" B&W) that still
>>has a "blooming" problem. It's not the board set as it has done this with
>>
>>
>3
>
>
>>different boards.
>>
>>I have replaced the HV diode (VARO H1809 with a VARO H1812 - I couldn't
>>
>>
>find
>
>
>>a H1809), but it still happens after warmup. It seems to expand in all
>>directions, but horizontal seem a little more than the vertical.
>>
>>
>
>
><<<<<snip>>>>>
>
>
>
>>Regards,
>>-Commander Dave
>>
>>
>
>
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>
>
>

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Received on Sun Sep 22 20:48:05 2002

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