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8.1.3 Power On Sequence
Sync-On Test Point B09 (+ Off)
2
3
4
5
6
7
S
9
10
11
12
13
14
15
16
17
Test
Point
Line Name or Function
(note 1)
- Power On
+ On SS
D06
- Start Multilevel
D12
-PickK1
D03
- Delay SS
B07
+ Start Multilevel SS
DOS
+ Inhibit UV Multilevel
None
Bring Up Multilevel Voltages (note 3)
-Start Dual Levell
B10
+Start Dual Level SSI
D07
-Inhibit UV Dual Levell None
- Pick K2
B03
Bring Up Dual Level Voltages (note 3)1
Pick K3
None
-Power On Delay
A2F2M04
(in disk drive)
- Channel Data Protect
A202J12
+ Hammer Fault
A202GOS
Notes:
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.
1
Also refers to trilevel supply when serial printer is
installed.
ALD
S01S0
S0100
S0110
S0115
S0130
S0115
S0110
S0110
S0115
S0110
S0115
DG100
D0050
D0090
Seconds
I
1
2
3
4
'.1"
5
6
7
I
I
I
I
I
I
I
I
(note 2)
"
""
J
6.2s nominal (5.0 to S.5s)
I
n
I
I
r-r:24
Vdc
I
...-0 Vdc
Start fans and 33FD
I
I
:U.
66 ms nominal (35 to 114 ms)
I
I
I
:::.JL
370 ms nominal (300 to 464 ms)
I
I
I
I
I
I
1
I
I
I
...J
I
±5 Vdc, ±12 Vdc, +S.5 Vdc, +6 Vdc, -4 Vdc (note 4)
I
I
I
Becomes active when all multilevel voltages are up
I
I
I
L-....::J
~
1.1 s nominal (0.5 to 2.0s)
I
I
I
I
I
1_+24 Vdc
I
1
~OVdc
Start disk drive
I
I
I
--Y
±24Vdc
I
I
I
I
----.J
Picked with +24V from dual level or trilevel (K3 bypasses
surge resistor)
1 - 3 2 s
- l
Allows disk drive to warm up and become ready
:~
:~
Approximately 40s after power up, +24V belt printer relay picks
~
,
/
Diagnostic programs can be loaded
3. These two lines do not represent voltage
levels but indicate the time the indicated
voltages are present.
4. The -5 Vdc and +S.5 Vdc outputs are moni-
tored following the time out of the start
multilevel SS. System power is dropped
immediately if the +S.5 Vdcis present with-
out the -5 Vdc.
after this point
Power Supplies
8-3
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