B-3
The 4010 line voltage transformer and bridge rectifier convert 120 VAC to the
DC voltage required by the 4010.
1. Meter the DC voltage across the crimped base of H1 and H2, just at the
point where the wires attach to the PC board. Refer to Figure B-2. These
terminals connect to the bridge rectifier mounted on the 4010 chassis, which
in turn connects to the line voltage transformer. DC Voltage across these
terminals should be within the range of 21-32 VDC.
2. Interpret the results of this test, as follows:
• If there is power at H1 and H2, the most likely cause is an incorrectly
adjusted brownout potentiometer. Refer to the previous section in this
appendix for information on setting this component.
• If there is no power at H1 and H2, there may be a problem with the line
voltage transformer, bridge rectifier, or one of the connectors.
Figure B-2. Location of H1 and H2 and P9 and P10
A series of plastic connectors link the 4010 PC board, the line voltage
transformer, and the bridge rectifier to the building’s AC power circuit.
Checking the integrity of these connectors allows you to eliminate these
components as a possible cause for AC power problems.
1. REMOVE ALL POWER (AC and Battery) FROM THE PANEL.
2. Remove the four Torx screws that secure the panel’s electronics to the
chassis.
3. Disconnect the External Power Supply harness from connectors P13 and
P14 on the 4010 PC board.
Continued on next page
Checking AC Power Supply Transformer / Bridge Rectifier
Checking DC Voltage at H1
and H2
Checking Connectors
Location of
H1 and H2
P9 P10
EPS (P13
and P14)
Harness
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