Checking Ac Power Supply Transformer / Bridge Rectifier; Checking Dc Voltage At H1 And H2; Checking Connectors - Simplex 4010 Service Manual

Checking AC Power Supply Transformer / Bridge Rectifier

Checking DC Voltage at H1
and H2

Checking Connectors

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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.
Location of
H1 and H2
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.
P9
B-3
P10
Continued on next page
EPS (P13
and P14)
Harness