Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
Issue 4 May 1998
Troubleshooting and Adjustments 7 - 7
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 7-1). 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.
7. While holding the meter selector switch in the BATT V
position, use a jeweler's screwdriver to adjust R15
potentiometer so that CM3 meter and the DMM connected
to the rectifier test points agree within ±0.02 volts.
8. Release the meter selector switch. The switch should
automatically return to the AMPS (center) position.
9. Disconnect the DMM from the rectifier REG test points.
10. Connect DMM to the rectifier output terminal and ground
(see Figure 5-2).
11. Observe and record the voltage indications on the DMM
and the rectifier meter as the meter selector switch is
moved to the indicated positions as shown in Table 7-B.
