Roland ME-80, Service Notes

Page: 22 / 40

22
Jan. 2014 ME-80
5.
Verify that the output value is between
4.9
and
5.2 Vp-p
.
fig.test5-3.eps
6.
Connect the oscilloscope to the
REC OUT/PHONES
jack.
7.
Depress the pedal
2
.
The 2 LED lights up.
8.
Verify that the output value is between 4.9 and 5.2 Vp-p .
fig.test5-4.eps
9.
Press CTL .
The
DELAY
LED lights up.
10.
Verify that the output value is between
4.9
and
5.2 Vp-p
.
fig.test5-5.eps
DA Residual Noise Check
1.
Connect the noise meter to the
Gt. AMP OUTPUT L/MONO
and
R
jacks.
2.
Depress the pedal
1
.
The 1 LED lights up.
3.
Verify that the noise-meter value is -58 dBm or less (DIN audio).
4.
Connect the noise meter to the REC OUT/PHONES jack.
5.
Verify that the noise-meter value is -58 dBm -90dBm or less (DIN audio).
A/D Check
1.
Make the settings shown below on the oscillator and connect it for input
to the
GUITAR INPUT jack.
200-Hz sine wave at 2.0 Vp-p
2.
Make the settings shown below on the oscilloscope and connect it to the
Gt. AMP OUTPUT L/MONO
and
R
jacks.
ch1: 1.00 V/div, ch2: 1.00 V/div, TIME: 1.00 ms/div
3.
Press EDIT .
The
PEDAL FX
LED lights up.
4.
Verify that the output value is between
1.9
and
2.1 Vp-p
.
fig.test5-6.eps
5.
Make the settings shown below on the oscillator and connect it for input
to the
GUITAR INPUT
jack.
200-Hz sine wave at 50 mVp-p
6.
Make the settings shown below on the oscilloscope and connect it to the
Gt. AMP OUTPUT L/MONO and R jacks.
ch1: 2.00 V/div, ch2: 2.00 V/div, TIME: 1.00 ms/div
7.
Depress the pedal
3
.
The 3 LED lights up.
8.
Verify that the output value is between 4.2 and 4.6 Vp-p .
fig.test5-7.eps
AD Residual Noise Check and Impact-
shock Noise Check
1.
Connect the noise meter to the Gt. AMP OUTPUT L/MONO and R jacks.
2.
Insert a 47-k
Ω
short plug into the GUITAR INPUT jack.
3.
Depress the pedal 3 and verify that the noise-meter value is -58 dBm
(DIN-AUDIO).
4.
Connect the monitor speakers to the Gt. AMP OUTPUT L/MONO and R
jacks.
5.
Verify that no abnormal noise is heard even when vibration is applied.