Conference kernel::csguk_systems

86.0. "HDA info" by KERNEL::PETTET (Norm Pettet CSC Basingstoke) Wed Jan 10 1990 07:33

From:	KERNEL::BROOKER "IS THE SOUND OF ONE HAND CLAPPING CL?  10-Jan-1990 0032" 10-JAN-1990 00:35:05.31
To:	@POST:SYSTEMS.DIS
CC:	
Subj:	O.O.H. PRINTHDA REPLACEMENT





Chaps,

	Attached is a blitz from Graham Bennell concerning new issues on RA 
devices.  Point 2. is the important one to us as it concerns a change in parts 
to be specified for a failing HDA, obviously this is only relevant to the 
Engineers who work nights.  

	For ease of reference I have included a list of the required parts at 
the end of this message.



							Clive.



From:	COMICS::BENNELL      "MAIL"  8-JAN-1990 13:36:41.65
To:	@FOCUS
CC:	BENNELL
Subj:	bigger tips than Samantha Fox




    +-------------+
    | | | | | | | |    C U S T O M E R   S U P P O R T   C E N T R E
    |d|i|g|i|t|a|l|    
    | | | | | | | |   		   B A S I N G S T O K E
    +-------------+       
			      *** INTEROFFICE MEMORANDUM ***          
 
			COMPANY CONFIDENTIAL    
    
    To:Focus Engineers  		Date:   8-Jan-90
					From:	GRAHAM BENNELL
    cc:					Dept:	Product and Technology Group.
						Device Support Group.
					Ext:	(DTN 7833) 3778
					Loc'n:	UVO Basingstoke
					DECnet: COMICS::BENNELL
		INFORMATION TIPS.
I am going to start distributing information in a different way. What follows
is a part formed package which I believe is news! Hope it helps.

1.
  RA82,s log LED 66 if the hybrid is revH3 and the drive is dismounted under
vms. If the drive is in a LAVC it may be logged on another CPU. REV's before
H dont seem to have the problem. A lot of Hybrid modules are being used and
the repair centre believe there is nothing wrong with them! The fault tag says
LED 66.
  RA82 hda's fail with 66 and usually have 24 and 39 as well. Offset and
erasure are responsible for this. 
  Unstable temperature seems to be involved with 66 as well.
	
Conclusion.
 Error code 66 is sometimes the HYBRID, it can be HDA or environment or related
to system mount/dismount commands. Watch out for it and the codes with which it
co-exists.


2.
	HDA usage is high at the moment. It will be the case for some time.
Fans are failing in RA81's causing earlier HDA death. Watch fans and Filters.
To give a new HDA the best chance of survival bless it with a NEW BELT and
TWO yes TWO new POWER SUPPLY FANS. The fans live for about 1.5 times the
RA81 hda life so to fail to replace will impact the HDA you are fitting!
I do know removing the power supply is not a liked job. I DO NOT CARE!
Leaving off the bottom left nut on the supply side fan will help the next 
engineer to work from the front. (A good tip from an engineer by the name of
Rooney)
Watch the multi coloured cable is clear of the fan before pulling the supply 
out. Watch the fan leads on re-insertion. 
MAKE SURE BOTH FANS PUSH AIR OUT OF THE BACK OF THE DRIVE.
For the future I have requested that HDA's are packed with fans and belts
(1 for each chassis type) meanwhile PLEASE get what you require.

3.
   RUMOURS.
   There is considerable VERY high level activity at the moment around HDA usage
and failure types. When your problem site happens let me know! The customer 
trouble statement will be something like "These RA's seem to have become
more unreliable!"

4. Would anybody care for a T.R.F.

		Regards


			Graham Bennell





			COMPANY CONFIDENTIAL



  Quantity

	1	RA81 HDA		70-18491-01	
	2	fan 120 c.f./m. 	12-17715-04	Replace both
	1	belt, rev 8, new style	12-12635-07	(Both required, as no
	1	belt, rev 7, old style	12-12635-05	clue from diagnosis
							which rev. drive. 
							you've got.)

	1	RA82 HDA		70-21170-01
	2	fan, 120 c.f./m.	12-17715-04	Replace both
	1	belt			12-12635-07

    

From:	KERNEL::HOUGH "Morning everyone  26-Nov-1991 1330" 26-NOV-1991 13:40:38.27
To:	@POST:24HR
CC:	HOUGH
Subj:	HDA Validations OOH


	As from 1st December 1991 there will be a change to the HDA Validation
	Process. From that date only the following HDAs will require 
 	validation:

			RA70, RA71, RA72, RA90, RA92

	This will reduce the amount of validations processed by the CSC by
	80%. The projected call volume for the Standby period (midnight - 07:00
	weekdays, 19:00 - 07:00 weekends) will be only 3-5 per month. As a
	result the HDA Standby rota will cease operation, also on 1st Dec.

	I have agreed with Andy Hopkins that the above periods will covered
	by the 24 hour Systems shift.

	I have placed a blue folder of HDA Validation sheets by the notice board
	displaying the shift rota. The numbers are SYxxx. I will collect the
	sheets periodically & enter then onto the HDA database.

	CCD have been told of this change, so you can expect a validation call
	from 1st Dec between the hours mentioned above. 

	As I said earlier, it is only about 3-5 calls/month. If, however, you
	need more information, I will only be too pleased to give a seminar or
	talk to people individually to bring you up-to-date on RA7x & RA9x 
	issues.

	Thanks & regards

	Richard Hough