Dc Power Connection; Ac Power Connection; Environment; Initial Checkout - Control Data Corporation BR8 SERIES Hardware Maintenance Manual

3.4.2 DC POWER CONNECTION
DC power (user-supplied) for standard FDD models is transmitted from the controller
via the I/O cable through the interface connector (Jl) on t he printed circuited board.
Daisy-chain FDD models receive DC power (user-supplied) through a power cable which
interfaces w.ith its mating connector (J7) on the printed circuit board. The pin
assign~
ments and line functions are shown on sheets 1 and 6 of the schematics, Figure 5-2. The
mating connector is described in Figure 5-3.
3.4.3 AC POWER CONNECTION
The AC Power Cable (CDC PiN 75292202 or equivalent - see Figure 3-1) is an optional
item supplied on order. The cable consists of stranded wire, 18 AWG minimum with
center pin connection utilized as frame ground. Refer to Figure 3-1 for connector part
numbers and attachment.
3.5 ENVIRONMENT
Operating and storage environments of the FDD are as follows:
Operating: 50° to 100°F (10° to 38°C) 12
of
(-II°C)/hr max. fluctuation
. 20% to 80% relative humidity
(providing there is no condensation)
Non-Operating: ~
-30° to
+
150°F (-35° to 65°C)
5% to 95% relative humidity
(providing there is no condensation)
Max. Wet Bulb 80°F (27°C)
3.6 INITIAL CHECKOUT
This procedure should be used to determine that FDD is operational. The procedure
assumes that the unit is installed and the I/O and power cables are connected.
a. Apply ac power to unit and visually check that the spindle rotates.
b. Apply dc power to unit.
c. For Daisy-Chain FDD models using dipswitch SI or S2 instead of jumpers W32,
W33, and W34: .
1. Close one of the Unit Select switches (dip switch positions 1,2, 3, or 4) located
on the circuit board.
2. Close one of the Ready switches (dip switch positions 5,6,7, or 8) located on
the circuit board.
3. If the Door Unlock option is installed, close one of the Door Unlock switches (dip
switch positions 9, 10, 11, or 12) located on the circuit board.
d. Insert diskette as described in Section 2.
e. Apply a head-load-command signal to the unit and close the access door. Check
that the head-load solenoid actuates, and the door microswitch is actuated.
f. Apply a stepping-command signal to the unit and check that the actuator steps the
head as commanded.
g. Remove diskette.
h. Remove the command signals and power from the unit.
3-2
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