Lucent Technologies Lineage
®
2000 50A Ferroresonant Rectifier J85502B-1
7 - 6 Troubleshooting and Adjustments
Issue 6 May 1999
RFA problem has been cleared. Otherwise, continue
the procedure.
c. If replacing the CM2 control board does not clear the
problem, then windings 11 and 12 of T1 may be open.
Try the following:
–
Check the wiring to the thyristor (Q1). (See Figure
5-2.)
–
Check for defective thyristor. Replace, if defective,
following procedure in Section 8.
Calibrate CM3
Digital Meter
Refer to Figures 5-2 and 7-1.
1. Loosen the locking screws and open the door of the
rectifier.
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
Note
Calibration is not feasible unless the DMM test meter has an
accuracy of ±0.02 percent or better.
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.
A Series 3 CM3 board can be identified by the designation
“AM3” which is stamped on the wiring (noncomponent)
side of the board. A partial sketch of CM3 boards is
provided in Figure 7-1.
