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Article #3738

Re: RD53s won't stay spun-up

#3738
From: jeh
Date: Sun, 03 Jan 1993 18:45
28 lines
1540 bytes
Thank you to the folks who have already sent me e-mail re this problem.  Both
of you suggested power supply problems.  However I have pretty much eliminated
that:  

	- The power supply in the PC does not seem to be at fault; 
	it is perfectly happy running two full-height 5-1/4 drives.

	- If I put the jumper back in and try the drives in a BA123, the
	same thing happens -- they shut down just about the time that I'd
	expect them to be up to speed.  Meanwhile the power supply in the
	BA123 seems to be working fine with other drives.

	- These drives used to work in this same BA123 cabinet.

	- Voltage checks (with a good DMM) on both supplies show no
	problems.  

	I really doubt that both the PC and BA123 power supplies went flaky
	in the same way at the same time (but only with these two drives).

I can't help thinking that I "bumped something" in the drives while pulling
the R7 jumper. 

(Just what does that jumper do, anyway?)

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
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Message-ID: <1993Jan3.104543.1061@cmkrnl.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!sol.ctr.columbia.edu!ucselx!crash!cmkrnl!jeh
References: <1993Jan2.160631.1058@cmkrnl.com>

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From: jeh@cmkrnl.com
Newsgroups: comp.sys.dec
Subject: Re: RD53s won't stay spun-up
Message-ID: <1993Jan3.104543.1061@cmkrnl.com>
Date: 3 Jan 93 10:45:43 PST
References: <1993Jan2.160631.1058@cmkrnl.com>
Organization: Kernel Mode Consulting, San Diego, CA
Lines: 28