Removal And Replacement - ETI NETCOM ADH Replacement Procedure

MAIN CIRCUIT BOARD ASSEMBLY

REMOVAL AND REPLACEMENT

To replace the Main Circuit Board Assembly
(23253) in either
Automatic Air Dehydrator with AC power or
an ADH NETCOM with Redundant DC
power, perform the steps below. Refer to
Figure 2. To replace the Main Circuit Board
Assembly (23253) in an ADH NETCOM AC
NEMA unit, proceed to page 13.
Main Circuit Board Assembly
mounted upright along
the right side of the unit
Figure 2. MAIN CIRCUIT BOARD
ASSEMBLY INSTALLED.
Shut off AC machine power by placing
1.
the power switch in the OFF (O)
position, then unplugging the power
cord. Shut off DC machine power by
shutting off the external power
supply. If possible, move the
dehydrator to a work table.
An Electro-Static Discharge (ESD)
2.
wrist strap and mat are required to
handle a PC board and perform this
procedure safely. If you haven't
already done so, put on an ESD wrist
strap and work on an ESD mat.
South Bend, Indiana USA | networketi.com
an ADH NETCOM
Right side
of chassis
3.
Remove both top panels and the front
panel. To remove the front panel, it
is necessary to disconnect the two
sets of electrical leads (4 total)
coming from the front panel green
and red LEDs, connected to the four
terminals on the right side of circuit
board terminal block J4.
Figure 3. Press in on the orange
release tabs under each lead, then
carefully remove the four LED leads
from circuit board terminal block J4.
Retain the mounting hardware from
all three panels. Because they are
not interchangeable,
mounting hardware separate with
each panel
installation.
Power
Supply
Press in gently on orange release tabs using flat
blade screwdriver to replace leads.
Figure 3. TERMINAL BLOCK J4.
4. Once the front and top panels have
been removed,
"Smart Switch" cable, if present, and
the RS232 cable from the two
receptacles on right side of the
circuit board.
cable is the upper one; the RS232
cable is the lower one. Disconnect
the Alarm Relay cable from the
receptacle on the left side of the
board.
Gently fold back the release handles
and the cable will disconnect.
6
ADH INSTRUCTION MANUAL | PART NO.
Refer to
keep
to facilitate
Green Red
LED LED
disconnect
The "Smart Switch"
Refer back to Figure 1b.
24097
the
re-
the
REV B