Curtis RU-150 Service Manual page 18

BREWING OPERATION
For the contact points referenced in this section,
see the schematic diagram below.
Components Involved:
1. Fuse
2. Brew Switch
3. Timer
4. Stop Switch
5. Water Pump
PROBLEM: Brew switch light does not turn on
when pressed.
Test: Check your power supply and fuse in con-
trol box. It may be burned out.
Problem: Brew switch does not stay on, or light
stays on only while switch is pressed but turns
off when released and water comes out of spray
head only while the switch is kept pressed.
Test Brew Switch: Take a voltage reading at
point A while the brew switch is pushed in. If you
read 110 volts, that means the switch is good.
Test Timer: The timer resets itself to the N. O.
position after every brewing cycle but if it fails
to stop itself, it will remain closed and cause the
problem in question.
To check the timer, power to the control circuit
must be turned off. Disconnect STP RED (point
B) and STP BRN (point C)wires and take a con-
tinuity test between the two terminals 8 and 9 on
the timer. If there is continuity, the timer is faulty
and must be replaced.
Test Water Pump: To test the water pump, press
the brew switch and take a voltage reading be-
tween points E and F. If there is voltage and the
pump does not run, replace the pump.
Test Stop Switch: The last of the components
involved in this operation is the stop button. The
only function of the switch is to interrupt the cur-
rent that energizes the timer after the brew switch
has been depressed. A voltage reading at N.O. of
the timer (point D) will indicate an open or closed
condition.
C D
A
E
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