Roland HP-1 Service Notes page 11

4. PANPOT CHECK
When you press the following buttons, you hear the corresponding sound as indicated below.
The display visualizes:
+---------------------- ➔ Sine Wave (Left = L)
|
+------------ ➔ Sine Wave (Left/ Right = C)
|
| |
+--- ➔ Square Wave (Right = R)
| |
| | |
+--- ➔ Sound OFF
| | |
| | | |
✷ ✷ ✷ ✷ ❍ ❍
T1 T2 T3 T4 T5 T6
Pressing the buttons as indicated in the following table, you hear the corresponding sounds.
Put the volume potentiometer at max.
Insert a jack connected to the oscilloscope into L/R output and then into the R output.
The oscilloscope shows the wave shape and its value in Volt (Vpp). Namely:
Button Wave shape
Tone PIANO
Tone E. PIANO
Tone HARPSI-CHORD
Press the button TONE ORGAN to stop the sound.
Press the button TRANSPOSE to go on to the next check.
Left output
Both output
Right output
Frequency (Hz) Output Volt (mVpp)
220 L Min 850 Max 950
440 L / R Min 620 Max 680
440 R Min 950 Max 1.050
HP-1 MH/RW, HP-2e RW/LA
5. A/D AND MIDI CHECK
A/D check:
The display visualizes:
Buttons and LEDs are as follows:
+------------------------------------ ➔
+--------------------------- ➔
|
+------------------ ➔
| |
+--------- ➔
| | |
| | | |
✷ ✷ ✷ ✷ ❍
T1 T2 T3 T4 T5
Pressing each pedal the corresponding blinking LED goes off, the display shows a value between 0 and 10 and
you hear a sine wave sound. When the value is 0 you don't hear any sound, when the value is 10 you hear a
bell-like sound.
Press the button TRANSPOSE to go on to the next check.
MIDI Check:
Connect MIDI IN and MIDI OUT sockets by a Midi cable:
The LED corresponding to the button T4 is:
G
: Connection OK;
❍
:Connection failed.
Blinking Led means that the connection has not been tested.
6. End
Once the MIDI check is ended and the MIDI cable is disconnected, the display visualizes:
Press the button TRANSPOSE to enter test mode again.
Turn the power off to exit test mode.
11
Mar, 2002
Soft Pedal
Sostenuto Pedal
Damper Pedal
MIDI Loop
❍
T6