henk.gooijen at oce.com
Tue Jan 17 15:50:19 CST 2006
I will first describe the results that I saw with looking at
the LEDs on the boards in the small rack inside the RK07 drive.
A small LED on the outer board (M9016) is always ON.
In the stand-by condition the UNLD HDS LED is ON.
When I load a pack, and push the LOAD button, the LEDs
SPEED OK and BRUSH go ON after approx 15 seconds.
A number of seconds later the LEDs BRUSH and UNLD HDS go OFF.
At that same time the LEDs LD HDS en FWD go ON and the heads
move toward the centre of the spindle. When the head has
reached that position, the LEDs LD HDS and FWD go OFF, and
RTZ and REV go ON. The head moves back, and when the heads
are on "track 0" (this is an assumption) those two LEDs go OFF
too. Only the SPEED OK LED is still ON.
I will have to boot RT11 to tell the error message.
AFAIK, you can not format the pack, only do an INIT.
I did not check the cable to the controller and to the next drive,
but I am pretty sure they are in the port A connections. As the
second drive is OFF (and has the terminator), and the controller
is OFF, I guess that this does not interfere with the load sequence
getting to the READY lamp ON state.
I can see the motor that drives the spindle runs, and the belt is OK.
It must be driving the platters, otherwise I think the SPEED OK LED
would not turn ON.
Indeed, there are 4 heads. The wires from one is clearly connected to a
different board, so that must be the servo data.
I will do your experiment, Tony.
And no, I will not blame you if the heads crash :-)
Good to hear that no FAULT light ON is OK.
I can also try the second drive this weekend, but I must remove the
brushes from that drive first. I have a third drive (!) but then
I must move stuff around to get to it ...
Van: cctalk-bounces at classiccmp.org namens Tony Duell
Verzonden: di 17-01-2006 21:46
Aan: cctalk at classiccmp.org
Onderwerp: Re: RK07 questions
> Hi all,
> I am working on the last peripheral device connected to
> my 11/34, two RK07s. This will be my first experience
> with RK07 drives, so I have a few questions.
> I installed the RK611 in the system (in an expansion box)
> and made sure that the UNIBUS is OK. The 11/34 starts, and
> I can boot RT11 from DL0:. ".SH DEV" shows that the DM.SYS
> driver is installed. However, after loading a pack the RT11
> commands ".DIR DM0:" or ".INIT DM0:" report an error.
What error do you get. IIRC the RK07 pack can be formatted (this does a
low-level format of the data surfaces). You need to do that before
INITing in most cases.
> I must say that the READY light did not turn ON on the drive.
> I switched the 11/34 OFF, because I think I need to take a
> closer look at the RK07 drive itself first.
> Here is what I did and saw.
> I removed the metal cover at the top-rear side. Now you can
> see the big magnet and the head assembly. I first checked
You can also swing the card cage assembly twards the rear of the drive.
Make sure you have the cables connected correnctly (IN and OUT are not
the same on these drives -- the controller must connect to an 'IN'
connector, the terminator to an OUT connector. Unless you have a
dual-ported drive, use the 'A' connectors, make sure you have the
interface card in the right slot of the cardcage, and press the 'A'
button on the front).
On the top of some of the boards are LEDs. The plastic cover over the
boards identifies them. What do they do at spin-up?
> the "emergency retract" mechanism. When you push down the
> lever that locks the heads, and gently push the head assembly
> forward toward the cartridge compartment, the heads are pulled
> back as soon as the little microswitch is (dis)engaged.
OK so the 9.6V NiCd under the chassis is still good.
> Then I loaded a pack and pushed the LOAD button.
> After some 20 seconds the disk has spun up (I assume), because
> the heads start to move.
You should hear the spindle motor start running. Mind you, if it wasn't,
you'd get some very nasty noises when the heads moved.
> The heads first move at a moderate speed toward the centre of
> the cartridge (I would say a full travel), stop, and then move
> back at that same speed, but not completely to the home position.
I think that is correct. The heads do a full seek to the inner guard
band, then return to cylinder 0.
> Again, I *assume* that the heads detected track 0 and stay there.
> However, the READY lamp does not go ON. It could not, because
> the lamp was defective :-) After replacing the lamp with a
> checked-good lamp, I repeated the exercise. The heads show the
> same movement, but the READY light stays OFF.
> 1. Is that head movement behaviour correct?
I think so.
> I will try to make a movie of the movement this weekend ...
> 2. What would the head movement be if the pack was bulk-erased?
I would think they'd go towards the spindle and then return to the
unloaded position as the drive wouldn't find any servo information at
I've not tried this, so don't blame me if the heads run into the spindle
or something horrible, but you could unplug the servo head from the servo
preamplifer and try again. With no servo signals at all, you'd be
simulating a bulk-erased pack. Look for a change in behaviour.
IIRC there are 4 heads in the RK07. All 4 head cables plug into the
read/write board, but one of them has another connector coming from it.
That's the servo head. The 'connector' on that head on the R/W board is
just to anchor the cable, it's the end-of-cable connector that plugs into
the servo preamplifier that you might disocnnect.
> 3. Should the READY lamp go ON?
I think so, but it's been a long time.
> An other thing I noticed.
> As the 11/34 is OFF, there is no controller connected to the
> RK07 drive. OK, it is, but not powered.
> With the RL drives the FAULT lamp will be ON if the controller
> is not powered. Is this the same for the RK07?
No, an RK07 will spin up and load the heads without a controller. No
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