Advertisement
Jul, 1998
(4) Press [WRITE], then " L:Saw is displayed on the LCD.
Check the signal at the OUTPUT L with an oscilloscope.
Check that a sound can be heard from left channels of the
monitor speaker and the headphones.
(5) Do sawtooth waveforms appear on left channels on an
oscilloscope?
Can sound from the sawtooth waveforms be heard on left
channels of the monitor speaker and the headphones?
* If error:
· Check IC31, IC35, IC36(DAC), IC37, IC55 and IC56 on the
MAIN BOARD.
· Check IC601 on the VOLUME BOARD.
(6) Press [WRITE], then "R: Square" is displayed on the LCD.
Check the signal at the OUTPUT R with an oscilloscope.
Check that a sound can be heard from right channels of the
monitor speaker and the headphones.
(7) Do Square waveforms appear on right channels on an
oscilloscope?
Can sound from the Square waveforms be heard on right
channels of the monitor speaker and the headphones?
* If error:
· Check IC31, IC35, IC36(DAC), IC37, IC55 and IC56 on the
MAIN BOARD.
· Check IC601 on the VOLUME BOARD.
(8) Press [WRITE], then "Effect" is displayed on the LCD.
A delay will be applied in order on the center, left and right so
check the sound on the left and right channels of the monitor
speaker and the headphones.
(9) Can sounds with a delay be heard from the center, left and right
in order?
* If error:
· Check IC21(DSP), IC64(DRAM) and their connections on the
MAIN BOARD.
(10) Press [WRITE], then "10 Voice" is displayed on the LCD.
10 tones corresponding to the white keys from C4 to E5 will be
issued so check the sound on the left and right channels of the
monitor speaker and the headphones.
(11) Can 10 tones corresponding to the white keys from C4 to E5 be
heard on the monitor speaker and the headphones?
* If error:
· Check IC31, IC35, IC36(DAC), IC37, IC55 and IC56 on the
MAIN BOARD.
· Check IC601 on the VOLUME BOARD.
(12) Press [WRITE], then "DRAM1" is displayed on the LCD.
Do(C4), Fa(F4) and Sol(G4) are issued in order. After they are
formed a chord, Fa(F4) and So(G4) are stopped.
(13) Does the output waveform contain noise?
* If error:
· Check IC18(DSP), IC23(DRAM) and their connections on
the MAIN BOARD.
(14) Press [WRITE], then "DRAM2" is displayed on the LCD.
Do(C5), Fa(F5) and Sol(G5) are issued in order. After they are
formed a chord, Fa(F5) and So(G5) are stopped.
(15) Does the output waveform contain noise?
* If error:
· Check IC19(DSP), IC24(DRAM) and their connections on
the MAIN BOARD.
(16) Press [WRITE], then "DRAM3" is displayed on the LCD.
Do(C6), Fa(F6) and Sol(G6) are issued in order. After they are
formed a chord, Fa(F6) and So(G6) are stopped.
(17) Does the output waveform contain noise?
* If error:
· Check IC20(DSP), IC25(DRAM) and their connections on
the MAIN BOARD.
(18) Press [WRITE], then "DRAM0" is displayed on the LCD.
Delay tones are issued in sequence?
(19) Does the output waveform contain noise?
* If error:
· Check IC17(DSP), IC63(DRAM) and their connections on
the MAIN BOARD.
(20) Press [WRITE], then "DRAM4" is displayed on the LCD.
Delay tones are issued in sequence?
(21) Does the output waveform contain noise?
* If error:
· Check IC21(DSP), IC64(DRAM) and their connections on
the MAIN BOARD.
8. Input Test
Raise the VOLUME LEVEL, the INST/LOWER INPUT LEVEL and
the VOCAL/UPPER INPUT LEVEL to the maximum.
Connect the OUTPUT L and R of JP-8080 to the oscilloscope.
Set the input range of the oscilloscope for 200mV/div.
NOTE:SINE WAVE (i),(ii),(iii) as in the following explanations are as
follows.
Depending on the program version, the value of the SINE WAVE
are different.
Versions earlier than 1.03
SINE WAVE (i) :f=1kHz, LEVEL=100mVpp
SINE WAVE (ii) :f=1kHz, LEVEL=500mVpp
SINE WAVE (iii) :f=1kHz, LEVEL=16mVpp
Version 1.04 or later
SINE WAVE (i) :f=800Hz, LEVEL=75mVpp
SINE WAVE (ii) :f=800Hz, LEVEL=500mVpp
SINE WAVE (iii) :f=1kHz, LEVEL=16mVpp
(1) [fig.13] is shown on the LCD.
[8] Input Test
[fig.13]
Press [WRITE].
[fig.14] is shown on the LCD.
[8] Input Test
REAR:
[fig.14]
(2) Input the SINE WAVE (i) to the INST/LOWER jack and the
VOCAL/UPPER jack in rear panel.
Two SIG/LIMITER LEDs of INST/LOWER and VOCAL/UPPER
light up green.
The SINE WAVE, the level of which go in two divisions
(400mVpp) of the oscilloscope, is displayed on a screen of the
oscilloscope.
According as you move the rotary volumes of INST/LOWER and
VOCAL/UPPER from the maximum to the minimum, the level of
the sine wave on a screen changes by degrees.
(3) Do Two SIG/LIMITER LEDs of INST/LOWER and
VOCAL/UPPER light up green?
* If error:
· Check IC43, IC44, IC53, IC54, CN3 and CN6 on the MAIN
BOARD.
· Check D84(LED), D85(LED), CN2 and CN3 on the PANEL
BOARD.
JP-8080
11
Advertisement
