Nortel North American DMS-100 Instruction Manual page 138

At a work table
37
38
39
40
DDU:
Switch #
1
2
3
4
5
6
7
8
DDU:
Switch #
1
2
3
4
5
6
7
8
41
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Replacing a 14-in. disk drive unit
WARNING
Damage to printed circuit board
If you place the DDU on its sides or its top, you can damage
the printed circuit board.
Place the DDU in a vertical position on a flat surface.
Obtain a label in order to return the DDU that has faults for repair. Secure the
label to the DDU that has faults.
Unpack the replacement DDU.
Note: Store the DDU that has faults in the box from the new DDU. The
other option is to store the DDU that has faults in the box found in step 2.
Use the old DDU as a guide to set the top DIP switches on the new DDU.
Match the DIP switches on the new DDU to the DIP switches on the old DDU.
The other option is to set the top DIP switches on the new DDU to the settings
that follow:
single-PCB 10K Model 6650-10
split-PCB 1J Model 15450-10
Function
unit select 1
unit select 2
unit select 3
unit select 4
skip defect protection
write enable
clock transmit
clock phase
single-PCB
split-PCB
Function
1 selector/track
2 selectors/track
4 selectors/track
8 selectors/track
16 selectors/track
32 selectors/track
64 selectors/track
reserved
Completely extend the DDU slide rails.
Setting
on
off
off
off
on
on
on
on
11K Model 6650-10
9F Model 15450-10
Setting
off
on
off
off
on
off
off
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(continued)