3 Installation
Model 1220
3-8
Teledyne Analytical Instruments
3.4 Channel Modules
Channel Modules may be removed by first unscrewing the top (retain-
ing) screw and then unscrewing the bottom (jack) screw. As the jack
screw is backed out, it will pull the module from its socket. When the jack
screw is free, the module may be slid out by pulling on the two screws. In
the event it is desired to remove a channel module without disturbing the
common alarm circuits, the channel module may be switched into standby
mode, by pressing the
switch, before removal. Reinstallation of the
channel module may be accomplished by sliding the module into the
chassis until the top and bottom screws can be engaged, engaging them,
tightening the bottom (jack) screw to reconnect the module, and then
tightening the top (retaining) screw.
WARNING: Disconnect power before performing any of the
following. These operations should only be per-
formed by a qualified service technician.
3.4.1 Removing the Channel Module Cover
In order to perform the actions in the following sections 3.4.2, 3.4.3
and 3.4.4, the cover of the channel module must be removed. To remove
the cover, unscrew the two 6-32 screws that hold the cover in place, then
slide out the cover.
3.4.2 Changing the Fuse
Remove the channel module cover as in section 3.4.1. The fuse is
located as shown in the Figure 3-4
Figure 3-4 Fuse and Sensor PCB Locations