Yamaha Disklavier MX-100A Service Manual page 38

8) PIANO Test
For the play back system, single keys are successively pressed during approximately 0.5 seconds from
Key 1. After Key 88 is pressed, the Loud Pedal and Soft Pedal are operated, then the sequence returns
to Key 1 and is repeated.
During playback, the START/PAUSE, Fast Forward (1-Key Skip), and Fast Reverse can be used.
For the recording system, the Key No. of the pressed key is displayed at the seven-segment LEDs (Loud
Pedal=90 Soft Pedal=91), and GET-DATA is displayed at the lower row of the LCD.
If an error occurs, "NG!!" is displayed at the lower row of the LCD and the Error No. is displayed at
the 7-segment LEDs.
Error No.
INVALID GET DATA
69
GET CIRCUITE ERROR(PARITY/FRAMING ERROR)
68
67 GET KEYOVER
GET CIRCUITE ERROR(RECEIVE OVER-RUN)
66
9) DRAM FDD Test
This test checks the refresh operation of the PMAC's DRAM, and performs Read, Write, and Verify
operations on the floppy disk drive.
MEANING
35