222D6021G028
Pub. No. 29-5915
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PCS940
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SCHEMATIC DIAGRAM
NOTE: When
door is
either being
locked or
unlocked,
both lock
switches
will be in
the open
position.
LOCKED
UNLOCKED
3
2
1
4
6
Door latch output pin – 25VDC
at all times measured to ground
Sensor and Lock
Switch Connectors
LOCK SW. #2
LOCK
SW. #1
LOCK SW. CIRCUIT
Door latched Input Pin
Thermal Switch
Door unlatched Input Pin
Thermal
Switch
LOCK SW.
N.O. CONTACT
OPEN
UNLOCK SW.
N.O. CONTACT
CLOSED
CAM IN
UNLOCK POSITION
UNLOCKED
LOCK SW.
N.O. CONTACT
CLOSED
UNLOCK SW.
N.O. CONTACT
OPEN
CAM IN
LOCK POSITION
LOCKED
3
2
1
4
6
Door latch output pin – 25VDC
at all times measured to ground
Sensor and Lock
Switch Connectors
LOCK SW. #1
LOCK
SW. #2
LOCK SW. CIRCUIT
Door latched Input Pin
Thermal Switch
Door unlatched Input Pin
Thermal
Switch
if the door switch is in the “C” to “NC” position
(door open).
•
motion. When the door is locked, the words
“LOCKED DOOR” remain illuminated in the
display.
•
CAM – The cam on the motor performs two
functions:
1. Positions the lock hook in the door to
prevent opening during clean operation.
2. Operates the lock switches which tell the
control if the door is unlocked or locked
and ready for Clean operation.
MOTORIZED DOOR LOCK
The motorized door lock assembly is located above the oven. The assembly
consists of a lock motor cam and switch assembly, lock hook and mounting
plate.
MOTORIZED DOOR LOCK OPERATION
The lock motor is energized when the control is set for Clean and Clean Time
is selected. The K4 Relay contacts will close and complete the circuit that
supplies the voltage to the lock motor.
L1
N
NO
C
NC
LOCK RELAY
LOCK
MOTOR
DOOR
SWITCH
L1
N
NO
C
NC
LOCK RELAY (K4)
LOCK
MOTOR
DOOR
SWITCH
DOOR LOCKING/OR UNLOCKING
ALL OTHER MODES WITH DOOR CLOSED
COM
MDL
COM
MDL
WIRING DIAGRAM
FAILURE
CODE
MEANING
CORRECTION
Determine if problem is with key panel or control by
13 to 14. Should be open. Should be 100–150 ohms while
pressing OFF key.
-F2-
1. Inside oven cavity as measured by
sensor over 650
°
F unlatched or
915
°
F latched
•
Welded relay contacts
•
Cooling fan stalled or blocked
•
•
High resistance in oven sensor leads/connectors
(especially at sensor in rear)
Shorted OFF key
-F0-
Over temperature
-F3-
•
Disconnect power. Disconnect sensor harness from
control. Measure sensor resistance (white leads) to
be ~1080 ohms at room temperature with 2 ohms
per degree change.
•
Look for damaged harness terminals if not a bad
sensor.
Open oven sensor (under 950
ohms)
Shorted oven sensor (over
2900 ohms)
-F4-
•
Disconnect power. Disconnect sensor harness from
control. Measure sensor resistance (white leads) to be
~1080 ohms at room temperature with 2 ohms per
degree change.
•
Separate sensor from harness to determine fault.
Shorted matrix or START
key
-F7-
Determine if problem is with key panel or control by
pinout chart. Allow up to 1000 ohms when pressing a key.
-F8-
EEPROM data shift failure
If repeated, replace control.
-F9-
Cooling fan stalls while above
650
°
F; open thermal switch in
yellow or blue leads
-FF-
Replace control.
Loss of latch motor safety
circuit
ERC FAILURE CODES
The oven may stop operating but not give an F code on the display immediately.
F codes are stored in nonvolatile eeprom memory until the same fault occurs
twice consecutively. After that, the F code will be displayed. F codes can be
recalled by pressing together TIMER, CLOCK, MIN DOWN or 9. While F codes are
displayed, pressing MIN UP or 8 and HR DOWN or 6 together will clear them. A
fault must exist continuously for 5 minutes before an F code is recorded (F2 and
F8 are sooner).
BAKE THERMAL SWITCH
The bake thermal switch is wired in series with the lock motor switches.
The limit switch opens at 169°F and closes at 140°F. If the thermal switch
opens during Bake, the program is cancelled and the lock motor will run.
The words “LOCK DOOR” will flash in the display.
THERMAL SWITCH
The thermal switch is located on the floor of the component compartment
in front of the fan motor. The thermal switch is wired in series with the
lock motor switches. The limit switch opens at 240°F and closes when
temperatures cool below 190°F. If the thermal switch opens during:
1. Oven Temperature Below 600°F, program is cancelled when thermal switch
opens. Lock motor will run and the words “LOCK” and “DOOR” will be
flashing in the display.
2. Oven Temperature Above 600°F, any mode of operation control will go to
-F9- failure code. When this condition exists, check the fan operation (look
for obstructions), inspect oven installation (make sure grille areas are not
blocked), oven insulation and lock circuit.
The control has a section that can be entered to change how the control will work. To
enter this section:
Press and hold BAKE and BROIL pads for 2 (two) seconds and “SF” appears in the
display. Select the area to change. When the change has been made, press START
to return to Time of Day.
• End-of-Cycle Tone – Press TIMER pad. Display shows “Con Beep
” when control
is set for continuous End-of-Cycle Tone or “Beep” when set for noncontinuous.
• °F or °C – Press the BROIL and COOK TIME pads at the same ti
me. Display will show either
“F°” or “C°.” Press the BROIL and COOK TIME pads again to change.
• 12-Hour, 24-Hour, or blank out Time-of-Day Clock – Press CLO
CK pad. Display
will show “12 hr,” “24 hr,” “OFF” for blank clock. Press again to change.
• 12-Hour Shutdown comes set to shut down after 12 hours of co
ntinuous operation;
this can be eliminated—press DELAY START pad. Display will show “No Shdn.”
To turn back on, press DELAY START pad again and display will show “12 Shdn.”
ress CLOCK and
TIMER pads at the same time. Display will start to cycle through the di erent modes
of operation.
• Sabbath Mode – This feature disables all but Bake and Timed
Bake, overrides
12-Hour Shutdown, disables beeps, and puts symbols in the display during Bake.
Access by pressing DELAY START pad until display shows “SabbAtH.” Exit by
pressing DELAY START until “No Shdn” or “12 Shdn” shows.
SPECIAL FUNCTIONS
222D8740P015
222D8741P015