Epson LQ 1050 Technical Manual - Page 81

DIP Switch Circuit

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REV.-A 2.3.4.3 DIP Switch Circuit and Jumpers The printer has two types of DIP switches and two jumpers. Figure 2-31 shows the DIP switch circuit. PBO 1 CPU : (781OHG) 4 (46) : 7 AN3 4 +5V 1 I RM 1 1 R65 IK PA? Vbv"r PA6 M R1OO IK J1 SW2-4 CN 1 36 m - 14 AUTO FEtD XT k Figure 2-31. DIP Switch Circuit DIP switch settings are read by the DIP switch circuit whenever the printer power is turned on and whenever the INIT signal is sent to the printer from the host computer. Jumpers There are two jumpers on the PEGX board. J 1: Determines whether or not the internally fixed printer selection signal (SLCTIN) is selected by the host computer. When jumper J 1 is connected, the SLCTIN signal is internally fixed (always selected). J2: Switches the memory capacity (5 12K bits or 256K bits) for the PROM (IC4A). 2-37

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2.3.4.3 DIP Switch Circuit
The printer has two types of
REV.-A
and Jumpers
DIP switches and two jumpers. Figure 2-31 shows the DIP switch circuit.
+5V
1
I
RM 1
1
PBO
1
CPU
:
(781OHG)
4
(46)
:
7
AN3
4
CN
1
R65
IK
PA?
Vbv”r
36
m
PA6
M
-
14
AUTO
FEtD
XT
R1OO
IK
k
J1
SW2-4
Figure 2-31. DIP Switch Circuit
DIP switch settings are read by the DIP switch circuit whenever the printer power is turned on and
whenever the INIT signal is sent to the printer from the host computer.
Jumpers
There are two jumpers on the PEGX board.
J 1: Determines whether or not the internally fixed printer selection signal
(SLCTIN)
is selected by the
host computer.
When jumper J 1 is connected, the
SLCTIN
signal is internally fixed (always selected).
J2: Switches the memory capacity (5
12K
bits or
256K
bits) for the PROM
(IC4A).
2-37