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Ordering Replacement Parts
Contact La Marche to place an order for spare or replacement parts. To order replacement parts; please provide
the model and serial number of the battery inverter, the parts needed, and the quantity required.
SCR Modules
The procedure for checking the SCR module is as follows:
➢ Disconnect the wiring going to the module.
➢ Using an ohmmeter, the three main terminals (A1K2, K1, A2) you should read high resistance in both
directions on your meter.
➢ Gate (G1) should read a high resistance between the top (A1K2), bottom (A2) terminals and a low resistance
(10 Ohm - 40 Ohm) to the middle (K1) terminal.
➢ Gate (G2) should read a high resistance between the middle (K1) and (A2) terminal and a low resistance
between terminal (A1K2).
NOTE: A wiring diagram of the module is located on the side of the component.
IGBT Modules
➢ With an ohmmeter, measure the resistance between Terminal 1 (collector) and Terminal 2 (emitter) negative
lead on Terminal 1 should read, low resistance. Reverse the meter leads and it should read a high resistance.
➢ With negative lead on one, measure to Terminal 3, it should read high resistance.
➢ With negative lead on Terminal 1, measure to Terminal 5, it should read a low resistance.
➢ When the S2A-297 or S2A-306 card is removed, jump the gate and emitter of the IGBT with copper wire to
protect from ESD damage.
C1, Resonating Capacitors 560 VAC – 660 VAC (approximately)
➢ With an ohmmeter, the meter should deflect to low resistance, then gradually rise to high resistance.
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