Roland HP-555G Service Notes page 12

HP-555G
INDICATION of LCD Names of the pedals
SS*(value) Soft Pedal
SF*(value) Sostenute
DP*(value) Damper
BL (value) Balance Slider
If no problem is found, you will automatically advance to the following item.
6. Serial interface check
When you want to go to the next test item during this check, press [Function] button.
MIDI operation check
Set the computer switch to the MIDI position. "s" symbol will be displayed to the middle of "FM" and "RM" in
the LCD.
Using a MIDI cable, connect the MIDI IN located under the keyboard to the MIDI OUT located at the back of the piano. If the test result is
OK, the LCD will indicate "OK" as follows.
Then, using a MIDI cable, connect between the MIDI IN and the MIDI OUT located at the back of the piano.
If the test result is OK, the LCD will indicate "OK" as follows.
*Computer interface operation check
(1) Mac: Settings for connection to a Macintosh.
Set the computer switch to Mac. An underline will be displayed below Mc in the LCD.
Connect a computer test cable (part no. 17049906) to the Computer connector under the keyboard.
Check both ends of the white conductor (signal) and black conductor (ground) of the test cable by oscilloscope, and confirm that a 1
MHz square wave is present.
Now turn on the switch of the computer test cable. If the result is normal, the OK will appear in the LCD as follows.
Turn off the switch of the test cable.
If the result is OK, the following display will appear in the LCD.
12
Nov. 1998