DG80-112
19
When all the LEDs light simultaneously, the Battery
Check is finished. Then the 80-112 selects the next
test no., so the LED display shows “5”.
(Error Number)
E0 : Battery Low (RAM DATA are kept.)
E1 : Unknown Error
E2 : Battery Low (RAM DATA are not kept.)
or Not Installed
5. MIDI Check
Connect the MIDI IN and the MIDI OUT terminals
with a MIDI cable. Press the [RECALL] key when the
LED display shows “5”. The MIDI Check is started.
(Test Contents)
The loop back MIDI check is executed automatically.
When the MIDI check is started, the LED display
shows “51” and then “52”. When all the LEDs light
simultaneously, the MIDI Check is finished. Then
the DG80-112 selects the next test no., so the LED
display shows “6”.
(Error Number)
E0 : MIDI Error
E1 : MIDI Error
6. SRAM Check
Press the [RECALL] key when the LED display
shows “6”. The SRAM Check is started.
(Test Contents)
The SRAM read/write check is executed
automatically.
When the SRAM Check is started, the LED display
shows “61” and then “62”. When all the LEDs light
simultaneously, the SRAM Check is finished. Then
the DG80-112 selects the next test no., so the LED
display shows “7”.
(Error Number)
E0 : RAM Address Error
E1 : RAM Read/Write Error
7. Flash Memory Erase/Write Check
Press the [RECALL] key when the LED display
shows “7”. The Flash Memory Erase/Write Check is
started.
(Attention)
When the result of the test number 6 has alredy been
“Error”, don't execute this test, or the DG80-112
won't set up at normal mode by the rewrited wrong
data in the Flash Memory.
Don't turn the [POWER] switch off while executing
this test, the DG80-112 won't set up at normal mode
by no data in the Flash Memory.
(Test Contents)
The Flash Memory Erase/Write check is executed
automatically.
When the check is started, the LED display shows
from “70” to “73” successively. When all the LEDs
light simultaneously, the Flash Memory Erase/Write
check is finished. Then the DG80-112 selects the
next test no., so the LED display shows “8”.
(Error Number)
E0, E1 : Flash Erase Error
E2, E3 : Flash Write Error
8. Sound Check
Before executing this sound check, the idling
adjustment, the output wave adjustment and center
voltage adjustment must be finished. the three
adjustments can be done while the LED display
shows “8”.
(Idling Adjustment)
1. Set the idling adjustment volume (VR303) at
minimum.
2. Connect the 4 ohm load to the speaker terminals.
3. Set the output volume at minimum.
4. Adjust the VR303 so that the DC voltage between
the terminals of the RA301 should be 5 +/-1 mV.
(Output Wave Adjustment)
1. After adjusting the idling adjustment, set the
OUTPUT VR at maximum.
2. When the signal of -2 dBm / 1 kHz is inputted from
the RETURN terminal, adjust the VR 301 (4.7 k
ohms) so that the wave shape should be a sine wave
symmetrical for upper and lower as below.
(Center Voltage Adjustment)
1. Adjust the VR302 so that the voltage of the output
circuit (RA301) should be 38 +/- 2 V.
* By adjusting the output adjustment and the center
voltage adjustment alternatively, search the best point.
After finishing the adjustments above, press the
[RECALL] key when the LED display shows “8”.
The Sound Check is started.
T•P
0.22X2
RA301
T•P
Adjust the VR301
to be a sine wave.
