RL02 Question

[Jay Jaeger]

My inventory indicates that I have a pair of lower ("UP") heads, part
number 70-15637 for an RL02.  (I don't have any spare "DOWN" heads as
far as I can tell).  I think they might even be new old stock, as they
are marked "NEW" in my inventory.  So maybe we could work something out.
  You might suggest a price, and we can take it from there.  Once we get
agreement, I'll open up the box they are in (in my garage) and confirm
my inventory.

JRJ


On 3/27/2018 4:34 AM, Aaron Jackson via cctech wrote:
>> On 03/26/2018 04:08 PM, Aaron Jackson via cctalk wrote:
>>>>> So, from what I can see, the drive should spin up correctly, but for
>>>>> some reason it goes into fault mode. I am right in thinking that upon
>>>>> load, the heads should continue moving forward until the first track is
>>>>> found, right? I should not have to perform a seek manually from the PDP?
>>>>> If this is not the case, perhaps there is something else wrong.
>>>> I’m not an RL02 hardware expert at all, just a daily user back in the
>>>> day. I’m reading this assuming that at all times the drive is
>>>> correctly hooked up to an RLV12 in a running PDP with the correct
>>>> cable and termination present on the drive? If it isn’t you’ll get a
>>>> fault condition instead of ready after spin up.
>>>>
>>>> A
>>> No worries, your input has been valuable, so thank you.
>>>
>>> For anyone else who might have an idea:
>> ON fault the heads are retracted and will not load till cleared.
>> Least mine behaves that way.
>>
>> Most common problems are wrong drive address, cable issues, no terminator.
>> Others include head lock not removed or the auto unlock style of
>> headlock has
>> the tab broken.
>>
>>> It seems to be hooked up correctly. When it is in the weird flashing
>>> ready state, the boot loader says "Read error" or "Device error"
>>> randomly. The heads oscillate back and forth very slightly as if it is
>>> trying to align itself better on the first track, which doesn't exist
>>> because it hasn't moved far enough into the pack.
>> IF in fault its resetting to retracted on every try.
>> If not something else is wrong.
>>
>>> I'm beginning to think the heads are bad which will be far too expensive
>>> so I may end up giving up.
>>
>> Heads are not that expensive... However you could have a wrong pack
>> or one that has been erased and has no servo tracks. You must start with
>> a known good pack and cleaned heads.
>>
>>
>> Allison
> 
> Thanks for the suggestions, Allison.
> 
> Given that the pack was tested before it was shipped, I am beginning to
> come to the conclusion that the heads are bad. I can see the servo burst
> data if I push the heads on a few mm further into pack, but perhaps the
> heads produce noise which confuse the logic upon load.
> 
> Heads are more expensive than what I'd like, from what I have seen on
> eBay.
> 
> I believe I have a "working" (i.e. non-crashing) down head (as in the
> one on top). If this is head 0 (anyone know?) then I might have a chance
> of getting it working without spending anymore money. Let's see.
> 
> Thanks again,
> Aaron.
>