Re: Asteroids problem sorta fixed

Hello !

Always discharge the monitor before messing with anything inside the HV box. I would just replace the HV diode with a new one. They run about $10.00 from Mark Capps (big dog). The HV diode is in-line with the wire going from the transformer to the CRT suction cup. It's probably filled with goo and needs to be cleaned up really well. Be sure the spring contacts inside the holder are nice and clean too. I've fixed a few of these monitors with blooming problems just by replacing this diode.

PS - You should use an HV probe to discharge. The screwdriver method tends to blow the diode.

Good Luck

Steve
   

-----Original Message-----
From: Sir Poonga <sirpoonga@hotmail.com>
Sent: Aug 1, 2005 10:47 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Asteroids problem sorta fixed

Ok. I have "blooming" then. According tot he faq it says clean transistors
first. Those should be clean as they are brand new.

For quick reference, page 14
http://www.ionpool.net/arcade/asteroidtech/WG-19V2000.pdf

The HV diode, that is....?

A failing HV diode will cause ‘blooming’ of your picture. Arcing within the
high voltage rectifier
connectors causes this condition. To cure this problem, follow this
procedure:
1. Switch off AC power and remove the monitor from the game.
2. Remove H.V. cover secured by two screws.
3. Unplug the H.V. rectifier from its holders and inspect the holders to
insure that the springs
are inside the holder.
4. Replace the bad rectifier with a new rectifier. The leads of the
rectifier must be cut and
formed in the same manner as the original.
5. Insert the rectifier firmly in its holders, banded side toward CRT.
6. Inspect the lead dress of the transformer H.V. wire. Wire must be
dressed.
7. Inspect fuse F102 on main deflection PC board. The fuse value should be
1.5 amp.
8. Replace the H.V. cover, which was removed in step No. 2.

So I don't have to discharge the monitor to do this?

----Original Message Follows----
From: "tom mcclintock" <tomm@mgcap.com>
Reply-To: vectorlist@vectorlist.org
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Asteroids problem sorta fixed
Date: Mon, 01 Aug 2005 22:50:37 -0500

Sir Poonga writes:

>I read through the Asteroids Repair Encyclopedia and haven't found a clue
>yet. I still have to go through the B&W Monitor FAQ pdf.
>Any ideas?

go through the B&W Monitor FAQ pdf.
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Received on Tue Aug 2 04:08:39 2005