Service&Troubleshooting Guide - Home Generator Systems __& Sf_a, _
Model 1938 (I OkW) Troubleshooting _ _'_
o• If 20-26VAC is present (going in) on Pins #14 &
Pin #15, but 12VDC was not measured (coming out) at
Pin #12, Wire #15, with the AUTO/OFF/MANUAL
switch set to OFF:
Verify Ground connection on CMA circuit board.
(See Figure 27)
Verify that there are no other faults
BEFORE
replacing the CMA circuit board.
_12-14VDC_ should be measured.
•• If charging voltage at the CMA board is OK:
• Repair fuse, wiring and/or connections between
Pin #12, Wire #15 between the CMA and (+) battery
cable.
• Recheck for charging voltage at (+) battery cable.
•• If trickle charge voltage (14VDC) is not at the CMA
board:
• Proceed with Stepdown Transformer Inspection.
Check The Step-down Transformer
• Measure for AC voltage across Pin #14, Wire #224
Pin #15, Wire #225 at CMA (Figure 14).
should be measured
&
|
@
@
@
• Replace The CMA board.
•• If 20-26VAC is not at present at Pin #14 & #15:
• Measure AC voltage across N I & N2 at the generator
terminal strip (Figure 15).
@
O
@
21
should be measured.
•• If 240VAC is present at N I & N2 but 20-26VAC is not
present at CMA:
• Repair and/or replace wiring, connectors or
step-down transformer.
NOTE: Make sure to check the fuses in the transfer
switch.
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