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50
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To each of the 6 units is allocated bits bl to b6 of input code
(See Table 2-2.).
When any of these bits is "I", that unit is
printed.
In graphic printing, the number of vertical dots is 12 or 9 so
line spacing takes place twice to print the upper half and the
lower half.
4.3.9
Power Supply
(1) A.C. VOLTAGE
A.C. voltage is applied via SWI POWER ON switch, through fuse F2,
and arc suppressor SK.
Note that SW5 switch will select minimum
or maximum a.c. voltage ranges across the tra"nsformer's primary
winding.
Select the range which is closest to your a.c. input.
The transformer passes 23 V a.c. and 9 V a.c. to the PCB via CN8.
(2) D.C. REGULATION
23 V a.c. is input to R17 and can be utilized on the I/O connector
pin 36 if needed.
Remove R17 if this voltage is not required. 23
V a.c. is also passed through rectifier 011, TR4, TR5 and filtered
by C29 and C28 (or CIO) to +24 V d.c., which is applied to the pulse
motors and print head.
The 9 V a.c. input is used to develop +10
V d.c. and +5 V d.c.
The +10 V d.c. line is connected via jumper
S6 to the interface pin 34.
Remove S6 if this voltage is not re-
quired.
+10 V d.c. is developed by'09 and 010, and applied to
regulator TR6 which outputs +5 V d.c., which is utilized throughout
the logic. 5 V d.c. is also used to power the POWER ON LED on the
front of the unit to indicate the Microline 80 has been switched on.
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