Replacing ASR Rack Modules
-
Replacing the Rack Digital Board
Removing
Installing
NOTE:
Removing
1.
Remove all cables connected to the ASR-10 Rack, including the power cord.
2.
Remove the lid (see below).
3.
The digital main board is the large board on top that you see when the lid is off.
Disconnect all cables from the digital board:
a) J2 Power 7-pin,
b)
Jl
Display, 24-pin ribbon,
c) JlO Disk, 34-pin ribbon,
d)
57
KPC simulator, 20-pin ribbon,
e)
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Analog, 34-pin ribbon,
f) J5 Digital Jack, 20-pin ribbon, and
g) J4 SCSI, 26-pin ribbon.
4.
Remove the ten (10) machine screws from the digital board:
a) Four (4) in front,
b) Four (4) in back, and
c)
Two (2) SEMs from regulator heat sink to bracket.
5.
Before installing the new circuit board, make sure the mylar insulator is in place.
You may want to use a drop of Loctite screws that hold the circuit boards if nylock screws are
not used (see Mechanical Issues).
6.
Replace the main board screws:
the two (2)
SEMs
are for the regulator heat sink.
7.
Reconnect the cables (see step 3).
8.
Power up, test the unit, and reattach the lid (see below).
REMOVING THE LID
Remove the twenty-five (25) screws that fasten the lid.
-
1.
Remove the four (4) #8-32 machine screws and star washers from each side panel of the
unit (the ones that could attach the mounting ears):
a)
Four (4) #8-32 x l/2” screws closest to front panel, and
b) Four (4)
#8-32
x
3/8”
screws.
2.
Remove the thirteen (13) #6-32 SEMS machine screws from:
-
a) Two (2) on each side,
b) Five (5) across the back,
c)
With front panel closest to you, on the left side, three (3) from heat sink bracket to
chassis, and
d)
One (1) above the disk drive (about an inch back from the front panel) that attaches the
cover to the disk drive bracket.
-
3.
Remove the four (4) #6 x 3/16” self-tapping screws that attach the lid to the front panel.
4.
Carefully remove the lid from the unit.
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ASR Service
Mhual
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