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Page 14
SERVICE (cont.)
BREW SELECTOR SWITCH
Location:
The brew selector switches are located in the
front left and right side of the hood.
Test Procedure:
Timer: Left or Right
1. Disconnect the brewer from the power supply.
2. Separate the connector on the selector switch
harness from the brew timer circuit board.
3. Carefully slide the plastic cover off of the con-
nector from the switch harness.
4. Check for continuity across the pink and tan wires
on the connector when the switch is in the 1/2
gallon position. Continuity must not be present in
any other switch position.
5. Check for continuity across the pink wire and gray
wire when the switch is in the 1 gallon position.
Continuity must not be present in any other posi-
tion.
6. Reattach the connector to the brew timer circuit
board.
Grinder Interface: Left or Right:
7. Disconnect the gray and tan wires on the selector
switch from the gray and tan wires on the interface
socket.
8. Disconnect the pink wire on the selector switch
from the grinder switch.
9. Check for continuity across the pink wire and tan
wire on the selector switch when the switch is in
the 1/2 gallon position. Continuity must not be
present in any other position.
10. Check for continuity across the pink wire and gray
wire on the selector switch when the switch is in
the 1 gallon position. Continuity must not be
present in any other position.
11. Reconnect the gray and tan wire on the selector
switch to the gray and tan wires on the interface
socket.
12. Reconnect the pink wire on the selector switch to
the grinder switch.
Bypass Valve: Left or Right
13. Disconnect the white/violet on the selector switch
from the bypass valve coil and disconnect the
white/red from the dispense valve coil.
14. Check for continuity across the white/violet and
the white/red wires when the selector is in the 1
gallon and 1-3/4 gallon position. Continuity must
not be present in any other position.
15. Reconnect the white/violet to the bypass valve coil
and white/red to the dispense valve coil.
Server Sensor: Left or Right
16. Disconnect the yellow, white/orange and the or-
ange wires on the selector switch from the yellow,
white/orange and orange wires of the brewer wir-
ing harness.
17. Check for continuity across the white/orange and
yellow wires on the selector switch when the
switch is in the 1/2 gallon position. Continuity
must not be present in any other position.
18. Check for continuity across the white/orange and
orange wires of the selector switch when the
switch is in the 1 gallon and 1-3/4 gallon position.
Continuity must not be present in any other posi-
tion.
19. Reconnect the yellow, white/orange and orange
wires.
Removal and Replacement:
1. Disconnect the connector on the selector switch
harness from the brewer timer circuit board.
2. Disconnect wires from the selector switch, inter-
face socket, dispense valve, bypass valve and
proximity sensor harness.
3. Loosen the set screw on the switch knob.
4. Remove the 9/16" nut and washer holding the
switch to the hood.
5. Remove the switch.
P972
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1.Check Server size if
Brewer refuses to brew.
2.McDonald's Brew
Temperature: 200
°F ± 5°
(3-18-96)
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