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

8.2.3 Power On Sequence
Sync-On Test Point B09
(+
Off)
1
2
3
4
5
6
7
8
9
10
Line Name or Function
- Power On
+ On SS
- Start Multilevel
- Pick K1
- Delay SS
-Start Dual Levell
- Pick K2
-Power On Delay
(in Disk)
- Channel Data Protect
+ Hammer Fault
Notes:
Test
Point
(note 1)
D06
D12
D03
807
810
B03
A2F2M04
A202J12
A202G08
1. These are power sequence card test points
except for the bottom three.
2. The levels of the signals on this chart are
normal logic levels except where otherwise
indicated.
ALD
S0180
S0100
S0110
S0115
S0115
S0110
S0115
DG100
D0050
D0090
Seconds
I
1 2 3
4
i i 7
I
I I I I
11
(note 2)
"
.,,,
U
6.2s nominal (5.0 to 8.5s)
I
n
I
I
h":24 Vdc
I
.-0 Vdc
Start fans, Diskette Drive, and Ferro Transformer
'I
OJ.
I
66 ms nominal (35 to 114 ms)
I
I
I
l--
Becomes active when all multilevel voltages are up
I
I
I
I
_+24 Vdc
I
1
,0Vdc
Start disk
I
I
I
Allows disk to warm up and become ready
1 -
32s
---f
/r---r-
f~
Approximately 40s after power up, +24 Vdc belt printer relay picks
~
/
Diagnostic programs can be loaded
after this point
Power Supplies 8-15