Replacing ASR Rack Modules
9.
Install the four (4) SEMs into the analog board heatsink.
10. Reconnect the cables (see step 5).
11. Install OEX-6sr board (see Section N).
12. Install the PCB Mounting Bracket:
a)
Connect the 26-pin rear panel connector cable into Jl of the SCSI board,
b)
Slide entire assembly toward the back of the unit. NOTE: Make sure the tabs on the
power supply heat sink bracket slide into the slots on the bottom of the PCB Mounting
Bracket,
c)
Slide all jacks into the holes in the rear panel,
d) Reconnect all cables, and
e)
Install the six (6)
#6-32
x
l/4
SEMs to the rear panel to PCB Mounting Bracket.
13. Power up, test the unit, and reattach the lid (see Section A).
SECTION
/
C
Replacing the Rack Power Supply Board
Removing
1.
Remove all cables connected to the ASR-10 Rack, including the power cord.
2.
Remove the lid (see Section A).
3.
Remove the PCB Mounting Bracket:
a)
Disconnect the 20-pin ribbon cable from
Jl
on the digital board,
b)
Disconnect the 34-pin ribbon cable from JlO on the digital board,
c) . Disconnect the power cable from
52
of the digital board,
d)
Remove the six (6) #6-32 x
l/4
SEMs from the rear of the bottom housing,
e)
Slide the whole assembly toward the front panel,
f) Tilt the front of the PCB Mounting Bracket up and disconnect the 6-pin power cable
from the analog board,
g) Disconnect the 26-pin ribbon cable from
Jl
on the SCSI board, and
h) Now you will be able to tilt the whole PCB Mounting Bracket so that the it is balancing
on the jacks.
4.
Disconnect the 9-pin cable (J4), the 6-pin cable
(J3),
and two 7-pin cables (J2, and Xl or
51)
from the power supply board. Note that these cables are keyed.
IMPORTANT! The connectors have a high retention force. Please use a scribe, screwdriver, or similar tool
to remove it (see p. 4). Do not pull on the wires!
Installing
5.
Disconnect the following wires from the transformer board:
a)
Green Transformer wires from Tl and T2, and
b)
Power Switch wires from T7 (red), T8 (blue), T6 (white), and T5 (orange).
6.
Remove the two (2) 6-32 x
l/4
SEM screws from the front heatsink to the bottom chassis.
7.
With the front panel closest to you, slide the board to the right and then toward you and out.
8.
Insert the replacement power supply board by placing the rear heatsink tabs into the bracket
slots.
NOTE:
You may want to use a drop of Loctite screws that hold the circuit boards if nylock screws are
not used (see Mechanical Issues).
ASR Service Manual
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