Lucent Technologies Lineage
®
2000 125A Ferroresonant Rectifier J85502C-1
Issue 8 July 1999
Troubleshooting and Adjustments 7 - 7
2. Locate the CM3 digital meter board on the inside of the
door.
3. If a Series 3 CM3 board is provided, skip to Step 5.
4. For Series 1 or 2 CM3 boards, remove the board from the
two support standoffs and the switch bezel by using a
small flat-bladed screwdriver to unlatch the bezel clips
from the switch and push in the latches on each standoff.
Do not disconnect any connector(s) leading to the control
board. Pull the CM3 board a short distance away from the
door so that the board may be turned over with the
component side facing you.
5. Locate the R15 potentiometer on the meter board (see
Figure 7-2). For Series 3 CM3 boards, R15 is easily
accessible on the component side of the board. For Series 1
or 2 CM3 boards, R15 is located under the wires of the
cable connected to P1B. The wires will probably have to
be pulled aside carefully or separated a small amount in
order to access the screwdriver adjustment on R15.
6. Connect a DMM (Digital Multimeter) to the rectifier REG
test jacks.
Caution
For Series 1 or 2 CM3 boards, use extreme care when
removing the board from the support standoffs (see notes
below).
Notes
A Series 3 CM3 board can be calibrated without removing the
board from the support standoffs. A Series 1 or 2 CM3 board
must be removed from the support standoffs to calibrate the
meter.
Series 3 CM3 boards can be identified by the designation
“AM3” which is stamped on the wiring (noncomponent) side
of the board. A partial sketch of the CM3 boards is provided
in Figure 7-2.
