RS-422 SINGLE-POSITION JUNCTION BOX (J-BOX)
8000-2573-20, REV. H
INSTALLATION GUIDE
8 of 10
Troubleshooting
Problem Possible
Solution
No Power
First check both fuses, then look
for open or loose wire connections
at TB1. If loose, reconnect wires.
Measure voltage across 0 and 24V
taps of secondary winding on
transformer. If open, replace
transformer. See “Removing the
Transformer” opposite.
No Data
Check for loose wires. If DS1 LED
does not glow green, see “Testing
for Data” on page 7. If still no data,
see “Removing the Circuit Board”
below.
Removing the Circuit Board
Follow steps to remove the circuit board. Reverse
steps to reassemble.
1. Loosen four captive screws to release cover.
2. Remove six screws to remove circuit board
(Figure 10).
Figure 10.
Removing the Transformer
Follow steps to remove the transformer. Reverse
steps to reassemble.
1. Loosen four captive screws to release cover.
2. As shown in Figure 10, loosen two screws and
slide chassis in direction of arrows. Gently lay
chassis on inside front cover while working on
transformer. Slide PCB chassis out of box.
Figure 11.
3. Remove four nuts to remove transformer
(Figure 12).
Figure 12.
Screws (2)
Screws (6)
Nuts (4)
