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Conference netcad::hub_mgnt

Title:	DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:	Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:	NETCAD::COLELLADT

Created:	Wed Nov 13 1991
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	4455
Total number of notes:	16761

510.0. "Please send us your dead DECagent 90s" by NAC::SEAVER (Bill Seaver, HUBwatch Mktg) Fri Nov 19 1993 20:28

Subj:	PLEASE RETURN ALL dead DECAGENTS TO NPSS - Michele Bigelow

Morning,

    I just talked with Michele Bigelow from our product support organization
    and she needs to have all bad DENMAs returned to her. NPSS thinks it has 
    found a harware problem with the agent and she needs as many agents as
    possible as part of her tests.

    I will ask Michele to send a message describing preliminary indications
    on the tests so far.

Michele can be reached at NPSS::BIGELOW

T.R Title User Personal
Name Date Lines

510.1 Defective DECagent component NAC::SEAVER Bill Seaver, HUBwatch Mktg Tue Nov 23 1993 00:30 42

T.R	Title	User	Personal Name	Date	Lines
510.1	Defective DECagent component	NAC::SEAVER	Bill Seaver, HUBwatch Mktg	`Tue Nov 23 1993 00:30`	42
	Seems ther is a marginal DC-DC converter From: NPSS::HOSKING 19-NOV-1993 14:10:52.68 To: BIGELOW CC: WONKKA,HOSKING Subj: failed DENMA's returned for evaluation Michele Re: Failed DENMA's returned for Evaluation: Per your request here is a brief description of the 3 failed units received from Art Filz. o Two of the units had defective EIA DC-DC converters 20-32787-01. Replacing the converters restored the units to functionality. o The third had one of the Flash IC's slightly charred... I did not diagnose that unit further. Additionally, I had another "interesting" unit returned from Bill Seaver, also with a bad EIA converter. Replacing the converter did not restore functionality, and the LED's behaved strangely. Diagnose shows that the 5170A octal driver has apparently been replaced with an incorrect IC; which explains the LED behavior. I have not done further work with this unit. Based on my analysis/evaluations, the principal reliability item is the above converter. Component engineering is currently negotiating reliability improvements with the two vendors who supply Digital with the DC-DC converter, 20-32787-01. Let me know if I can be of further assistance. Cheers! Terry

Seems ther is a marginal DC-DC converter
    
From:	NPSS::HOSKING      19-NOV-1993 14:10:52.68
To:	BIGELOW
CC:	WONKKA,HOSKING
Subj:	failed DENMA's returned for evaluation

Michele

Re: Failed DENMA's returned for Evaluation:

	Per your request here is a brief description of the 3 failed units 
        received from Art Filz.

	o  Two of the units had defective EIA DC-DC converters 20-32787-01.
           Replacing the converters restored the units to functionality.

	o  The third had one of the Flash IC's slightly charred... I did not
           diagnose that unit further.


	Additionally, I had another "interesting" unit returned from Bill
        Seaver, also with a bad EIA converter.  Replacing the converter did not
        restore functionality, and the LED's behaved strangely.   Diagnose
        shows that the 5170A octal driver has apparently been replaced with an
        incorrect IC;  which explains the LED behavior.  I have not done
        further work with this unit.


	Based on my analysis/evaluations,  the principal reliability item is
        the above converter.

	Component engineering is currently negotiating reliability improvements
        with the two vendors who supply Digital with the DC-DC converter,
        20-32787-01.

	Let me know if I can be of further assistance.

        Cheers!
	 
        Terry