Component Testing and Adjustment 7-9TP-5648 8/93
Controller Circuit Board
It is possible to check some controller circuit board
components (relays) without removing the component
from the board. These checks should be made prior to
installing a new board and attempting startup. Most of
the tests are referenced in Section 4. General
Troubleshooting. Use a high quality multimeter and
follow the manufacturer’s instructions. To obtain
accuratereadingswhentesting,removeall circuitboard
connectors and conformal coating (transparent
insulation) from component terminals. Use the chart
Figure 7-7 for the controller circuit board layout and
schematic .
K1 Relay Coil K1 coil terminals Ohmmeter on If good--approx. 160 ohms.
(See relay schematic) R x 10 scale Low resistance (continuity)--
shorted coil.
High resistance--open coil.
K2 Relay Coil K2 coil terminals Ohmmeter on If good--approx. 160 ohms.
(See relay schematic) R x 10 scale Low resistance (continuity)--
shorted coil.
High resistance--open coil.
K3 Relay Coil K3 coil terminals Ohmmeter on If good--approx. 400 ohms.
(See relay schematic) R x 10 scale Low resistance (continuity)--
shorted coil.
High resistance--open coil.
K4 Relay Coil K4 coil terminals Ohmmeter on If good--approx. 125 ohms.
(See relay schematic) R x 10 scale Low resistance (continuity)--
shorted coil.
High resistance--open coil.
K5 Relay Coil K5 coil terminals Ohmmeter on If good--approx 510 ohms.
(See relay schematic) R x 10 scale Low resistance (continuity)--
shorted coil.
High resistance--open coil.
Ohmmeter
Component Connections Remarks Results
Figure 7-7. E-239563 Circuit Board Tests
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