GE PS978ST1SS - Door Lock Assembly Operation and Testing; Door Lock Assembly Display Indicators; Door Lock Assembly Testing

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Door Locked-PSH925
Door Unlocked-PHS925
Hook Pulled In - Top Switch Closed - Bottom Switch Open
Hook Pushed Out - Top Switch Open - Bottom Switch Closed
(Continued next page)
The display will fl ash “DOOR ”if the lock switches
are not set to satisfy present lock or unlock request.
The motor relay will be energized.
• When the lock assembly is in the Lock-Home
position to operate a Clean cycle, “DOOR ”
remains lit.
• CAM – The cam on the motor performs 2
functions:
1. Positions the lock hook in the door to prevent
opening during Clean operation.
2. Operates the lock switches that tell the control
if the door is unlocked or locked and ready for
Clean operation.
• When the door is either being locked or
unlocked, both the lock and unlock switches will
temporarily be in the open position.
• The LOCK relays require a signal to be at 0–1.5
VDC (low) called CLN_TEMP found on the Main
Logic Board J241-6 (upper) and J241-7 (lower). If
these pins are at ~5VDC with respect to J241-5
(gnd), the motor relays will not operate.
• The door lock motor has an approximate
resistance value of 1.97K .
• Test the lock switches on the relay power supply
module at location J16.
2
3
4
5
RSPM
J16
Lock Switches
Y
O
BU
BU
Y
FAD
2
3
4
5
RSPM
J16
Lock Switches
Y
O
BU
BU
Y
FAD