Tweco 15XC Merlin - Manual (Page 107)

Manual 0-2251 5-35 CUSTOMER/OPERATOR SERVICE
5.12 SERVICE AND TEST PROCEDURES (continued)
M. Current Control Check The current control pot receives its high (10 V) on J10-17
and its low (3.3 V) on J10-13. The wiper (J10-15) must be
3.3 - 10 vdc. Measure the wiper between J10-15 and TP1
(ground) on the switching control board. If the high and
low are present and the wiper is less than 3.3 vdc, either
the control pot on the LED PC board or the ribbon cable is
faulty.