Gerard Luppino writes:
> From ger@hokupa.IFA.Hawaii.Edu  Wed Dec  4 22:29:57 1996
> Date: Wed, 4 Dec 96 22:41:53 HST
> From: ger@hokupa.IFA.Hawaii.Edu (Gerard Luppino)
> Message-Id: <9612050841.AA27716@hokupa.ifa.hawaii.edu>
> To: massey@cfht.hawaii.edu, tmca@cfht.hawaii.edu
> 
> 

> UH 8K mosaic installation instructions for CFHT
> -----------------------------------------------
> 
> 4 Dec 1996

> 
> G. Luppino
> 
> Below are instructions for setting up the UH8K on CFHT PF.
> First of all, let me list the modifications that were made to 
> repair the instrument and hopefully make it more reliable.
> 
> First the repairs: when I received it, the shutter was in bad shape.
> The cocking motor was burned out completely. We were able to locate
> a replacement -- but this unit had an integral encoder and modifications
> had to be made to the mount to hold it. This was done successfully. In
> addition, a replacement motor had been ordered. After testing the new
> motor, and starting the tedious process of aligning and setting up the
> limit switches, the motor power supply burned out. Given that I had
> no replacement that would fit into the limited space within the
> instrument, I opted to remove the power supply from the instrument
> completely and installed a connector that allows the use of an
> external power supply.  This external supply will be needed when the
> instrument is used at PF. The supply should be a linear 2-voltage
> split supply with +20V (+/-2V) at 1 amp and -4V  at 0.3 amp 
> (-5 OK, -3 too low). 
> A lab benchtop supply is ideal for this purpose. Avoid switchers. 
> 
> The major recurring problem with the shutter has been two blade
> firing.  This problem was occurring because of flexure in the rails 
> on which the shutter blades slide. In certain positions, the blades 
> would be oriented such that the 2nd blade was barely latched by its 
> solenoid catch. When the first blade solenoid fired, the 2nd blade 
> would sometimes "come along for the ride."
> I've fixed this problem (I hope) by relocating the 2nd blade solenoid 
> catch by about 0.5 mm so it has a firmer grip on the 2nd blade, no matter
> what the orientation of the instrument with respect to gravity. 
> I've tested this numerous times at what were previously the worst
> orientations and not a single double blade firing occurred. 
> Let's keep our fingers crossed.
> 
> Now for setup:
> 
> 1) Remove the base unit from the wooden crate. Note the cardboard box 
> containing the AC adapter cable and 15-pin D external power supply cable
> with 3 flying leads.
> 
> 2) If the camera is powered up, please shut it down following the 
> previously-sent shutdown instructions. 
> 
> 3) Mount the 8K power supply onto the base unit. This attaches
> at the two gold-anodized brackets onto the side of the cross base unit.
> Its obvious where this unit attaches. There are mounting holes on only
> one of the 4 sides of the cross, and there are 10-32 screws in the holes.
> It takes some finesse to get these screws to line up OK.
> 
> 4) Now mount the dewar onto the base unit. Be sure to:
> 
> 	- remove the dark slide first (be careful pulling it out).
> 	- mount the camera onto the black ring on the base unit.
>           The orientation is also obvious. The power supply connectors
>           on the electronics boxes must face the power supply on the base unit
>           if the power cables are to reach. The camera attaches with the 4
>           captive screws built into the front plate of the camera.
> 
> 5) Attach the two power cables from the power supplies to the CCD controllers.
> 
> 6) Put on the AC adapter cable. This is the one that was in the box
> with the shutter. The AC adapter plugs into the power strip mounted
> on the side of the power supply box. The other end has 3 connectors.
> The 9-pin D plugs into the 9-D connector on the base unit over
> by the manual controls for the filter slide. The two 15-D connectors
> go to the two CCD controllers -- they are labelled 1 and 2 and go to the
> respective CCD controllers. Please run the cable in a neat and orderly fashion.
> 
> 7) Now the instrument should be ready to lift onto the PF bonnette.
> 
> 8) when you are ready to test things, be sure to open the
> side port where the manual shutter controls are located (the
> one with the copper tape strip that acts like a hinge) and flip
> the Manual/Remote switch to remote (the small switches are on the PCB
> and the labels are heard to read -- one switch is labeled R/M and the
> other O/C for open/close). R/M shoule be in R. I believe I left it in M.
> 
> 9) You need to attach the external power supply to the base unit
> through the connector/cable I provided in the box with the shutter. This is a 
> 15 D connector with 3 wires. Pin 1 is +20V, pin 2 is GND, pin 3 is -5V.
> These voltages are needed to fire the shutter solenoids and run the shutter
> motors and filter slide motors. Connect the power supply and power it up.
> 
> 10) You can now power the instrument up in the normal
> sequence (see the previous instructions):
> 
> 	- insure high voltage toggles on electronics boxes OFF (down)
> 	- insure power supply box OFF
> 	- turn toggle switch on power strip on side of power supply ON
> 	- verify Temperature controller is on and reads temp 
> 	- power on CCD power supply -- green +5V lights should appear
>           on electronics boxes.
> 	- Do communications test with host computer. Reset and retry
>           until solid communications are established and download can
>           be done several times successfully (mosaic full).
> 	- Once successful download occurs, turn on high voltage toggles
>           on BOTH controller and re-download immediately. DO NOT TURN
>           THESE TOGGLES OFF ONCE THEY ARE TURNED OFF. UNIT SHOULD ONLY
>           BE TURNED OFF WITH MAIN POWER SUPPLY SWITCH! (and then the toggles
>           can be turned off). High voltage lights should come on (2 yellows
>           and a red).
> 	- you are now ready to read out real CCDs.
> 
> 11) You can also exercise the filter slide manually or remotely and the 
> shutter the same way. If weirdness occurs with either, please turn off
> the power to the filter/shutter (unplug the AC adapter as well) and
> await my arrival.
> 
> 12) you will of course want to install the filters.
> 
>  
> Good luck -- see y'all at around 4PM.
> 
> Ger
> 
> 
> 
> 
> 
> 
> 
> 
> 


-- 
Timothy M. C. Abbott                http://www.cfht.hawaii.edu/~tmca/tmca.html