Sanyo SPW-D253GH56 Service Manual page 87

Important
Never press CL (clear) button unless you want to erase the accessed data in memory.
Follow the procedure below only when erasing is necessary.
To erase accessed data, press the CL button.
When erasing is finished,"----" mark appears on the controller's display.
CAUTION
After checking the alarm messages, be sure to press the TEST / CHK button.
(E) Check the remote controller itself for correct operation
The remote controller has a self-diagnostic function to check if it works properly. Use this
procedure to find out if the remote controller itself is in trouble.
a Turn ON the RCU.CK switch on the back of the P.C.B. Ass'y in the remote controller.
See section (A) for exact location.
b The appearance of the display will tell you whether or not the remote controller is
working correctly or not.
Normal condition – All displays appear for 10 seconds, then disappear.
Unusual condition – All displays flash ON and OFF for 10 seconds, then
disappear.
CAUTION
After checking the panel, be sure to set the RCU.CK switch to this original OFF
position.
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4. Service procedures
SM830036
4