HA243821
Issue 5 Mar 98
Section 2
Page 2 - 11
MODEL 346 INSTALLATION AND OPERATION MANUAL
2.4.5 CIRCUIT BOARD LOCATION
There are seven circuit board locations on the recorder chassis: five rear chassis plug-in slots, one main board
(containing the microprocessor and chart drive circuitry) located across the chassis bottom and the annotator drive
(with battery) board located as shown in figure 2.4.5 The boards located in the five rear slots are as shown in table
2.4.5a, below. The slots are numbered from top (slot 1) to bottom (slot 5).
Board
type
1
2
3
4
5
6
7
8
9
10
11
12
13
Two relay board
Four relay board
Six relay board
Two relay board
Four relay board
Two triac board
Four triac board
One re-transmission board
Two re-transmission board
three re-transmission board
Six event input board
RS422 comms board
Six event and RS422 comms board
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
Board
description
Slot 3
Slot 4
Slot 5
Possible board locations
1
2
3
4
5
Input amplifier board (channels 4, 5 and 6)
Input amplifier board (channels 1, 2 and 3)
Option board
Option board
Option board
Slot
Board type
Figure 2.4.5 Circuit board location diagram
Table 2.4.5a Circuit board locations
OPTION BOARD TYPES
There are 13 types of option board that can be used in the option slots as shown in table 2.4.5b, below. With the
exception of Slot 5, any Option board can go into any Option slot. Because of the chassis jacking bolt, the 2, 4
and 6 relay boards and the retransmission boards cannot go into Slot 5. Separate 2 and 4 relay or Triac boards
are available for Slot 5. This limits the maximum number of relays to two boards of 12 (Slots 3 & 4) and one board
of 4 (Slot 5) giving a maximum of 16 relays in all.
Table 2.4.5b Option board types and permitted locations
Main board
Slot 5
Slot 4
Slot 3
Slot 2
Slot 1
Mother
board
Display
unit
Print driver/
battery board
head
Print cartridge