Panasonic SD-ZB2502BXC - Key Operation and Check Modes

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5.2. Key operation and check mode
Before trobleshooting, operate the checkmode in the following procedure.
5.2.1. Key operation
Multiplex push key
1. "Main body test" mode
"Menu" key + "Crust" key + "Start" key
2. "YD confirmation" mode (during a main body test)
"Crust" key + "Stop" key
3. "RD confirmation" mode (during a main body test)
"Size" key + "Stop" key