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Conference wrksys::alphastation

Title:Alpha Workstation Conference
Notice:See note 1.* for conference notices
Moderator:WRKSYS::HOUSE
Created:Wed Sep 07 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1996
Total number of notes:9122

1941.0. "Where does the speaker connector attach?" by STAR::COOK (Just say NO to that AccViO! - Java!!!) Thu Apr 24 1997 17:49

    
    I inherited an AlphaStation 255/233 (PB-471-AA).  It seems
    that the speaker wire connector had been unplugged from the
    circuit board back before I got the machine.  (Maybe the prior
    owner didn't want to hear the alarm bell, but I do.)
    
    The connector has four female inline pin-holes...only the
    two outer-most ones have wires attached...one red and one
    black.  The owner's manual doesn't seem to show enough
    detail regarding where this connector should go.
    
    So, the question is:  Where (precisely) does this speaker connector
    plug in?
T.RTitleUserPersonal
Name		DateLines
1941.1if it fits, it's the right oneWRKSYS::SCHUMANNThu Apr 24 1997 22:246
The speaker plug goes on a plain unshrouded 4-pin header on the motherboard. I
think it's labeled "speaker", but I'm not certain. As far as I know there's only
one 4-pin header on the motherboard. The plug can go on the header in either
orientation.

--RS
1941.3the real answer is...WRKSYS::SCHUMANNFri Apr 25 1997 12:1219
re .1 and .2

Fred and I are both wrong!

1) There is no sound card in 255. The sound chip is on the MLB.

2) The speaker header is not a four-pin header. It's an 8-pin header,
   J7. It is labeled "SPKR" and is located near the floppy connector
   at the edge of the MLB. The 4-pin speaker cable can be plugged
   in to either side of the 8-pin header, in either orientation.

3) There IS a four-pin header, adjacent to the 8-pin speaker header.
   That header is for the CD-ROM audio cable. (If you plug the speaker
   cable into the CD-ROM header, it doesn't work, but causes no
   damage.)

I apologize for the misinformation in my first reply.

--RS
1941.4STAR::KLEINSORGEFred Kleinsorge, OpenVMS EngineeringFri Apr 25 1997 13:585
    
    Oh well, I guess I looked in my mustang, and expected things to pretty
    much be the same ;-)
1941.5Argh...what's that noise???STAR::COOKJust say NO to that AccViO! - Java!!!Fri Apr 25 1997 19:2242
    RE: .3
    
    ||2) The speaker header is not a four-pin header. It's an 8-pin header,
    ||   J7. It is labeled "SPKR" and is located near the floppy connector
    ||   at the edge of the MLB. The 4-pin speaker cable can be plugged
    ||   in to either side of the 8-pin header, in either orientation.
    ||
    ||3) There IS a four-pin header, adjacent to the 8-pin speaker header.
    ||   That header is for the CD-ROM audio cable. (If you plug the speaker
    ||   cable into the CD-ROM header, it doesn't work, but causes no
    ||   damage.)
     
	My eyes aren't good enough (and I didn't have a flashlight handy)
    to see any writing.  But, there was an existing connector for a CD-ROM
    audio cable already plugged in.
    
    	Just outwards (toward the edge of the motherboard) from that, I
    found the 8-pin header.  I plugged it onto the inner group of four
    pins.
    
    	I then put it back together, attached cables, powered up, and
    brought up VMS.
    
    	My first few tests seem to reveal that it still wasn't working.
    (To test, I sent myself a couple of mail msgs.)  After a few minutes,
    I forgot about the issue and went back to work.
    
    	After about 5 or 10 minutes, noises (not beeps) started coming
    from the machine.  I put my ear up to the speaker...sure sounds like
    thats where they're coming from.  But, what I'm hearing is steady,
    uninterrupted series of 'beats', each about one-half second
    apart.
    
    	(I'm now betting that it was this *noise* that caused the
    previous owner of this machine to disconnect the speaker wire
    from the motherboard in the first place!!!!)
    
    	Anyone familiar with this 'failure mode'?
    
    
    					Dave