Parkes Fault #2093: S2 power supply problems (fwd)
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From: <John.Reynolds_at_email.protected>
Date: Tue, 16 Nov 2004 11:49:15 +1100 (EST)
Warwick,
Shades of your new improved Dell laptop battery supply!
Ever had this with any of the correlator S2s?
The Parkes S2 must be close to the oldest unit we have - hopefully not an
omen.
Cheers,
John R
---------- Forwarded message ----------
Date: Tue, 16 Nov 2004 11:41 +1100
From: parkes-faults_at_csiro.au
To: parkes-faults_at_csiro.au
Subject: Parkes Fault #2093: S2 power supply problems
Reported By: John Reynolds
Project: V162
Date Occurred: 15-NOV-2004 22:00 EDST (15-NOV 11:00 UT)
Time Lost: 0 minutes
User-defined category: Other h/ware - online
The problem:
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Upon powering up the S2 VLBI recoder after several days left off, no visible signs of life were seen (no LEDs, no comms).This was repeated on several power cycles.
On inspection in situ it was found that the nominal +5V supply was running at about 1V and the nominal 12V was giving the cooling fans only the gentlest of nudges. A relay could be heard clicking.
Removed power supply, vacuumed some of the vast quantities of dust.
Tapped gently several times what appeared to be thermal/overload cutout relay - supply appeared to come good. Replaced supply in unit, powered it on and nothing happened for ~30 secs. Tapped supply with screwdriver handle several times and it came good (whether the tapping helped who knows).
Has been fine since.
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To respond, click on the following link.
http://www-int.parkes/cgi-bin/feedback/ff_response.cgi?fault_no=2093
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Received on 2004-11-16 11:49:34
Date: Tue, 16 Nov 2004 11:49:15 +1100 (EST)
Warwick,
Shades of your new improved Dell laptop battery supply!
Ever had this with any of the correlator S2s?
The Parkes S2 must be close to the oldest unit we have - hopefully not an
omen.
Cheers,
John R
---------- Forwarded message ----------
Date: Tue, 16 Nov 2004 11:41 +1100
From: parkes-faults_at_csiro.au
To: parkes-faults_at_csiro.au
Subject: Parkes Fault #2093: S2 power supply problems
Reported By: John Reynolds
Project: V162
Date Occurred: 15-NOV-2004 22:00 EDST (15-NOV 11:00 UT)
Time Lost: 0 minutes
User-defined category: Other h/ware - online
The problem:
-----------------------------------------------------------------
Upon powering up the S2 VLBI recoder after several days left off, no visible signs of life were seen (no LEDs, no comms).This was repeated on several power cycles.
On inspection in situ it was found that the nominal +5V supply was running at about 1V and the nominal 12V was giving the cooling fans only the gentlest of nudges. A relay could be heard clicking.
Removed power supply, vacuumed some of the vast quantities of dust.
Tapped gently several times what appeared to be thermal/overload cutout relay - supply appeared to come good. Replaced supply in unit, powered it on and nothing happened for ~30 secs. Tapped supply with screwdriver handle several times and it came good (whether the tapping helped who knows).
Has been fine since.
-----------------------------------------------------------------
To respond, click on the following link.
http://www-int.parkes/cgi-bin/feedback/ff_response.cgi?fault_no=2093
-----------------------------------------------------------------
Received on 2004-11-16 11:49:34