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LBI-39152
MAINTENANCE
RM INSTALLATION AND REMOVAL
Installation:
1.
Orient the RM so pin 1 lines up with the RMIC
connector X1 pin 1 (see Figure 4).
2.
Carefully set the RM pins into the RMIC
connectors X1 and X2 and press the RM firmly to
seat.
NOTE
Keying plug should be located in RMIC connector
X2 pin 35. This will align with RM position 35
which has the pin removed.
Removal:
1. Gently grasp the RM and while rocking back and
forth, lift RM out of RMIC connectors being
careful not to bend any pins.
30
Pin not used
Front
Key Plug
31
10
MAINTENANCE
CAUTION
OBSERVE PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE
DEVICES
NOTE
X1
X2
Figure 4 - RMIC Jumper Locations
RMIC JUMPERS
The RMIC has two jumpers which must be installed
prior to use.
Receive Telephone Line Termination
The jumper, X6, when installed on X4 inserts or
removes R1 from the receive telephone line circuit. R1 is
used to balance the line on T1.
G
Install jumper X6 on X4 pins 1 and 2 to add R1
and terminate receive data for 600 ohm telephone
line (default position).
G
Install jumper X6 on X4 pins 2 and 3 to remove R1
from circuit.
RM RTS Control
The jumper, X7, when installed on X3 determines if the
RTS signal is generated on board the RMIC or controlled by
an external device.
G
Install jumper X7 on X3 pins 1 & 2 for internal
control of RTS.
G
Install jumper X7 on X3 pins 2 & 3 for external
control of RTS (this is the normal position for
Voters).
ALIGNMENT PROCEDURES
The only alignment or adjustment on the RMIC
involves using DIP switch S1 to set the modem Output and
Receive levels. Each DIP switch segment selects a different
amount of signal off a voltage divider.
1
S1
8
7
RX
Level
6
X4
5
4
3
TX
2
Level
1
U5
X3
1
61
C B A
1
R44
R43
T1
1
R45
T2
32
C B A
X5
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