INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A70B
PAGE 12 OF 16
Problem: Control Transformer Fuses blown CTF2 or CTF3.
1.
Defective S2A-122A Drive Board.
2.
Shorted MOV. (Metal Oxide Varistor)
NOTE: Voltage across secondary of control transformer:
X1 - X2 = 120Vac.
X3 - X4 = 11Vac.
X5 - X6 = 11Vac.
X3 - X6 = 22Vac.
Problem: Complete "ON" but battery not charged.
1.
Record all readings on digital display board before disconnecting battery. Check status of complete
light.
2.
Check battery for defective cells.
3.
Call local La Marche Representative or factory for additional information.
4.
Possible settings on the S2A-122A drive board.
Problem: Contactor does not pull in.
1.
Check AC input voltage and fuses.
2.
Check DC voltage at DC output terminals (battery connected).
3.
Check AC voltage output on control transformer.
4.
If 120 Vac. is present at AC contactor coil, contactor may be defective.
5.
If 120Vac. is not present, disconnect 15 pin connector from the S2A-122A printed circuit board, and
jump pin #10 and pin #11 together. If AC contactor pulls in, defective S2A-122A printed circuit
board.
Problem: Failure light on CODE 0001 OR 0002.
1.
Check AC input voltage must be +/- 15% of nominal AC voltage for the low AC sensing point, +/-
10% for the high AC sensing point.
2.
Check taps on power and control transformer.
3.
Check AC contactor.
4.
Check voltages on the secondary side of the control transformer.
5.
Loose connections on the control transformer.
Problem: Failure light on CODE 0003.
1.
Check battery for correct number of cells.
2.
Check for defective or shorted cells in battery.
3.
Open circuit battery voltage must be above 1.6Vpc..
4.
Defective S2A-122A Drive Board.
