Power Off Sequence - IBM System/32 Introduction And Maintenance Manual

8.2.4 Power Off Sequence
Level Filter Assembly
D
Primary Power Fault;
Inhibit Disk Write
Current
Multilevel Filter
Assembly Fault
OV /OC/UV Sensed
Inhibit Undervoltage
Sense of Multilevel
Filter Assembly
D
Turn Off Blower
Motors and Ferro
Transformer
Note 3
Dual Level Filter
Assembly Fault
OV /OC/UV Sensed
Thermal
Condition
Inhibit Undervoltage
Inhibit Undervoltage
Sense of Multilevel
Filter Assembly
D
Turn Off Diskette
Blower Motors, and
Ferro Transformer
Inhibit Undervoltage
Sense of Dual Level
Filter Assembly
Turn off
Drive Motors
Note
2
D
Turn Off Disk
Drive Motor
Normal
Power Off
POWER
Switch Off
8-16
Notes:
1. A multilevel filter assembly failure simultaneously
turns off the multilevel and dual level voltages.
A multilevel or dual level filter assembly fault
turns on the PWR CHK light on the operator
control panel.
2.
Temperature too high in the power supply, belt
printer, or gate turns on the TH CH K light on
the operator control panel.
3. A loss of ac input power (fuse 101 blown, main-
line switch turned off, or line cord pulled) is not
indicated by the PWR CHK light.
To restore system power following a power
fault condition:
a. Turn operator control panel POWER switch
to OFF.
b. Press RESET switch on CE control panel.
c. Turn operator control panel POWE R switch
to ON.
I
Kill
4. Relay is dropped.