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8-2
8.1.2
Power Sequence and
Distribution
r-- -
-
-
-
-
-
-
-
Power Sequence Card - -
-
-
-
-
-
-
-,
I
S0100-S0195
200,208,230 Vac,60 Hz
200,220,235 Vac, 50 Hz
Main Line
Switch
YA040
Fuse 101
(0.4 amp)
YA060
Fuse 102
(10 amp)
YA040
Surge resistor Rll is bypassed
Kl
YA040
by relay K3 when +24 volts from
dual level supply is sensed.
Tl
I
I
+24 Vdc Control
1-----_
+5 Vdc Control
I
t-----:"I-_
-24 Vdc Control
~--:-I-"
+6 Vdc
1------.
-6 Vdc Reference
I
AC Board
YA040
L ______ _
--~l
Blowers-
Y
A008
Picked
Kl
Relay K5 monitors the
+24 volts generated by the
ac board. Failure of the
+24 volt circuit drops relay
K5 causing a normal power
down sequence. K5 down
inhibits the disk drive
write current line
Printer/Gates/Power Supplies/Disk Fan/33FD Drive Motor
K3
YA040
Rectifier
YA040
YA100
Thermal
Switches
Normal
Start
Multilevel
Supply
Multilevel
Supply Voltage
Present
St:lrt Dual
Level Supply
or Trilevel
Supply
Disk
Brake
Released
+24V Sense
From Dual
Level Supply
Picked
-4 Vdc
is
Vdc
l
+6 Vdc
To
Logic
+8.5Vdc
Boards
±12 Vdc
±24 Vdc
To Logic Boards
t -_ _ _ _
+4_8_V_a_c_ .. To Serial Printer Power
A
K2
YA040
Motor Control - Y A040
62GV
Supply and Fans
YA142 - Trilevel
±24Vdc
/
The disk drive motor has a manual thermal reset.
If this thermal is tripped the only indication is the
motor not running; power on the system stays up.
Dual
Level
Supplyl
l
~~9iC
I-----a------
Boards
1
Dual Supply - Belt Printer
Trilevel Supply - Serial Printer
50, 100, 155
Ipm Belt
Printers
J
2851pm
~
Belt Printer
Y A 120 - Dual Level
and Belt Printer
Printers with +24 Vdc interlock on
hammer driver cards.
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