disassembly of an MVD half

MVD disassembly

Pictures taken during the disassembly of the MVD East half, August 16 2002 HvH. I will improve the image quality later.

MVD East half, showing F-clamp and mount pin near top, central cuff and hinge piece near the bottom.

Remove outer enclosure hold-down strips
Remove inner enclosure cuffs, put screws back in D-ring.
Remove F-clamps.
Remove outer neoprene gasket, loosen outer foil
Remove inner neoprene gasket, loosen inner foil
Remove inner enclosure.

Inside looks good. No major delamination of foil from outer enclosure. Sag and bow visible by eye, of order 3-6 mm at the center (with half laying on it's back).
Detail of one of the ends. Notice the sewing thread holding the cage stack together was left in place.

Remove the mounting pin that holds the upper strut to the bottom MB stack.
Put the half onto a 'type 3' (=SE) plywood base.

Remove outer enclosure (marked NE and SE on inside.

Mount post on backside of the plate that supports the outside of the MB stack. Shim to lightly support the MB stack.

Remove screws from upper strut
Remove upper strut
Mount the support (squeeze fit) that holds up the bottom of the MB stack.
Remove screw from lower strut.

Shim up the top MB stack at the 3 support points: the lower strut, and the back and bottom support posts. This will separate the 2 quarters. Make sure the straws and the plenum mylar strip are loose.
Separate the 2 halves, and place on 2nd plywood base (type 4). Practice the grip and twist first.

Remove the nylon screws between the 'wings' and C-cage #1. Protect pads with tissue paper.
Remove bottom straws to free up cages from wings.
Gently pry loose the connectors with a screwdriver, and lift the stack out onto the metal mounting fixture, which is configured for 'B'.

Now disassemble the NE quarter:

Place pressure fixture on the cages to stabilize them.
Unclip ZIF connectors using the special tool, and remove the Power/Comm boards. Pack and label SE - IT, IM, IB, and OB.

Cut sewing thread holding cages and plenum together.
Remove the pressure fixture.
Use the spacial staw tool to push down straws. Lift off cage, watch where the plenum mylar strip goes.
Pack up cages, collect straws, mylar plenum strips and mylar plenum shims at the bottom of the stack.
What's left is the NE MB stack.

Now disassemble the NE MB stack:

Place stack upside-down onto the high carboard jig - secure with masking tape.
Remove RTV from LV connectors and water tube.
remove the 6 nylon screws that go to the MB spacers
Turn stack over onto the other cardboard jig
remove all nuts from the bottom (endplate side), close all connector wings
Lay the stack onto the table, and lif the MB off the endplate; the MB goes onto the lower edge of the cardboard jig.

remove nuts on the top of the plenum cover (labeled A-F). For A (on the air pipe), also remove the big spacer nut on the underside.
Lift off the plenum cover

Open the ZIF connector and lift out the pad detector assemblies. Store in the special holders and boxes that Toshi made for them

Last update 22 Aug 2002 - HvH
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MVD East half, showing F-clamp and mount pin near top, central cuff and hinge piece near the bottom. Remove outer enclosure hold-down strips Remove inner enclosure cuffs, put screws back in D-ring. Remove F-clamps. Remove outer neoprene gasket, loosen outer foil Remove inner neoprene gasket, loosen inner foil Remove inner enclosure.
Inside looks good. No major delamination of foil from outer enclosure. Sag and bow visible by eye, of order 3-6 mm at the center (with half laying on it's back).
Detail of one of the ends. Notice the sewing thread holding the cage stack together was left in place.
Remove the mounting pin that holds the upper strut to the bottom MB stack. Put the half onto a 'type 3' (=SE) plywood base.
Remove outer enclosure (marked NE and SE on inside.
Mount post on backside of the plate that supports the outside of the MB stack. Shim to lightly support the MB stack.
Remove screws from upper strut Remove upper strut Mount the support (squeeze fit) that holds up the bottom of the MB stack. Remove screw from lower strut.
Shim up the top MB stack at the 3 support points: the lower strut, and the back and bottom support posts. This will separate the 2 quarters. Make sure the straws and the plenum mylar strip are loose.
Separate the 2 halves, and place on 2nd plywood base (type 4). Practice the grip and twist first.
Remove the nylon screws between the 'wings' and C-cage #1. Protect pads with tissue paper. Remove bottom straws to free up cages from wings. Gently pry loose the connectors with a screwdriver, and lift the stack out onto the metal mounting fixture, which is configured for 'B'.
Now disassemble the NE quarter: Place pressure fixture on the cages to stabilize them. Unclip ZIF connectors using the special tool, and remove the Power/Comm boards. Pack and label SE - IT, IM, IB, and OB.
Cut sewing thread holding cages and plenum together. Remove the pressure fixture. Use the spacial staw tool to push down straws. Lift off cage, watch where the plenum mylar strip goes. Pack up cages, collect straws, mylar plenum strips and mylar plenum shims at the bottom of the stack. What's left is the NE MB stack.
Now disassemble the NE MB stack: Place stack upside-down onto the high carboard jig - secure with masking tape. Remove RTV from LV connectors and water tube. remove the 6 nylon screws that go to the MB spacers Turn stack over onto the other cardboard jig remove all nuts from the bottom (endplate side), close all connector wings Lay the stack onto the table, and lif the MB off the endplate; the MB goes onto the lower edge of the cardboard jig.
remove nuts on the top of the plenum cover (labeled A-F). For A (on the air pipe), also remove the big spacer nut on the underside. Lift off the plenum cover
Open the ZIF connector and lift out the pad detector assemblies. Store in the special holders and boxes that Toshi made for them