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8.2.2 Power Sequence and
Distribution
r--------------------PowerSequenceCa~~---------------------
SOl OO-SO 195
200,208,230 Vac, 60 Hz
200, 220, 235 Vac, 50 Hz
-/.~
Mainline
Switch
YAOOl
Fuse 101
(0.4 amp)
YAOOl
Fuse 102
(10amp)
YAOOl
Kl
YA001
J1
+24 Vdc Control
t---t---e
+5 V dc Control
t--+--..
-24 V dc Control
t - - t - -..
+6 Vdc Control
t---t--..
-6 V dc Control
Console
Power On
AC Board
YA002
Switches
Normal
Blowers-YA 150
Relay K5 monitors the +24V
generated by the ac board.
Failure of the +24V circuit
drops relay K5 causing a nor-
mal power down sequence.
K5 down inhibits the disk
write current line.
Printer/Gate/Power Supply /
Disk Fan/Diskette Drive Motor
Multi-
Ferro
level
Transformer
Filter
Asm
YA010
YA010
Multilevel
Filter Asm
Voltage Present
Dual Level
Filter Asm
Voltage Present
-4 Vdc
±5 Vdc
+6Vdc
+8.5 Vdc
±12 Vdc
Disk
Brake
Released
~
To Logic
Boards
- - - Motor Control Disk
K2
1\
I
·
YA001
The disk 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.
Pick K1
Dual
Dual
Level
Filter
Asm
+48 Vac
To Serial Printer Power
Supply and Fan
+24 Vac
I
To Logic
t---....----.
Boards and
Belt Printer
YA010
Dual Level
El-El--EJ--G
Printers with +24 Vdc interlock on
hammer driver cards
8-14
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