TECH: Atari Regulator/Audio II help needed.

[adrian_cresswell]

[ukvac] TECH: Atari Regulator/Audio II help needed.
Acquired a "new" machine last week. [Battlezone cabaret]



On power up - nothing.

All voltages present apart from +5v.

Visual inspection showed resistor R5 fried on audio/reg board.

Replaced R5 and tried again. Now got +3v and R5 getting very very hot, so
obviously something still amiss.

I have tested Q2 and Q3 and they "appear" to be OK, as do al the other
components.

The only thing I haven't tested is Q1 [not sure how - at the moment]



Has anyone had the same problem - if so, can you remember what had failed to
cause R5 to fry?



I have substituted another audio/reg board from another machine, and the
game works [well sort of - but hopefully some new RAM will sort that....] so
I know the problem must be on the audio/reg board itself.



As always, any help greatly appreciated



Adrian.

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[DanP]

Re: [ukvac] TECH: Atari Regulator/Audio II help needed.
Hi, check/replace the big transistor in the centre of the large heatsink -
it's a 2N3055 and is available from RS.

Cheers

Dan.

>From: "Cresswell, Adrian" <adrian.cresswell@schwab-europe.com>
>Reply-To: ukvac@yahoogroups.com
>To: "'ukvac@yahoogroups.com'" <ukvac@yahoogroups.com>
>Subject: [ukvac] TECH: Atari Regulator/Audio II help needed.
>Date: Tue, 3 Dec 2002 11:19:21 -0000
>
>Acquired a "new" machine last week. [Battlezone cabaret]
>
>
>
>On power up - nothing.
>
>All voltages present apart from +5v.
>
>Visual inspection showed resistor R5 fried on audio/reg board.
>
>Replaced R5 and tried again. Now got +3v and R5 getting very very hot, so
>obviously something still amiss.
>
>I have tested Q2 and Q3 and they "appear" to be OK, as do al the other
>components.
>
>The only thing I haven't tested is Q1 [not sure how - at the moment]
>
>
>
>Has anyone had the same problem - if so, can you remember what had failed
>to
>cause R5 to fry?
>
>
>
>I have substituted another audio/reg board from another machine, and the
>game works [well sort of - but hopefully some new RAM will sort that....]
>so
>I know the problem must be on the audio/reg board itself.
>
>
>
>As always, any help greatly appreciated
>
>
>
>Adrian.
>
>
>
>_______________________________________
>
>WARNING: All emails sent to or from this address will be received by
>the Charles Schwab Corporate Email system and are subject to archival and
>review by someone other than the addressee.
>
>Issued by Charles Schwab Europe, a member firm of the London Stock Exchange
>and LIFFE and
>regulated by The Financial Services Authority (FSA Registration No.
>139258).
>
>Registered Office: Cannon House, 24 The Priory Queensway, Birmingham B4
>6BS. Registered in
>England No. 2092410 VAT Registration No. GB 486 894471
>
>
>

 

[adrian_cresswell]

RE: [ukvac] TECH: Atari Regulator/Audio II help needed.
>Hi, check/replace the big transistor in the centre of the large heatsink -
>it's a 2N3055 and is available from RS.

That's Q3 on the diagram. I've checked it [out of circuit] and it seems OK.

Is it common for these to fail under load?

_______________________________________

WARNING: All emails sent to or from this address will be received by
the Charles Schwab Corporate Email system and are subject to archival and
review by someone other than the addressee.

Issued by Charles Schwab Europe, a member firm of the London Stock Exchange and LIFFE and
regulated by The Financial Services Authority (FSA Registration No. 139258).

Registered Office: Cannon House, 24 The Priory Queensway, Birmingham B4 6BS. Registered in
England No. 2092410 VAT Registration No. GB 486 894471