Roland BOSS BR-1180 Service Notes page 19

12 MIC2 PHANTOM
1.
Pressing the [ENTER] button switches PHANTOM on and off .
2.
Using a tester, measure the voltage between the MIC2(XLR) 2(HOT) and
3(COLD) pins and 1(GND) while PHANTOM is on, and confirm that it is
45V to 50V.
3.
Connect an instrument (condenser mic, etc) compatible with PHANTOM
power to MIC2 and confirm that the waveform that is input is output
from LINE OUT.
4.
Press the [RIGHT] cursor button and proceed to the next item.
13.GTR/MIC2 AUDIO
1.
Input a 40mV, 1kHz rectangular wave to MIC2(XLR).
2.
Move the SENS knob of GUITAR/BASS from MAX to MIN to MAX, and confirm
that the waveform for the L/R channels of LINE OUT changes smoothly.
3.
Confirm that the PEAK LED starts to come on when the SENS knob is
turned to 2 o'clock.
4.
Confirm that the waveform disappears when a short plug is inserted into
MIC2(TRS).
5.
Pull out the short plug.
6.
Pull out MIC2(XLR).
7.
Turn SENS of MIC2 to MAX and confirm that the residual noise level for
LINE OUT L/R is -78dBu(JIS-A).
8.
Press the [RIGHT] cursor button and proceed to the next item.
14.MIC1 A/B
1.
Input a 40mVp-p, 1kHz rectangular wave to MIC1(XLR)
2.
Confirm that waveforms for the L/R channels of LINE OUT appear and
disappear alternately
3.
Press the [RIGHT] cursor button and proceed to the next item.
15 MIC1 PHANTOM
1.
Pressing the [ENTER] button switches PHANTOM on and off.
2.
Using a tester, measure the voltage between the MIC1(XLR) 2(HOT) and
3(COLD) pins and 1(GND) while PHANTOM is on, and confirm that it is
45V to 50V.
3.
Connect an instrument (condenser mic, etc) compatible with PHANTOM power
to MIC1 and confirm that the waveform that is input is output from LINE OUT.
4.
Press the [RIGHT] cursor button and proceed to the next item.
16.MIC1 AUDIO
1.
Input a 40mVp-p, 1kHz rectangular wave to MIC1(XLR).
2.
Move the SENS knob of MIC1 from MAX to MIN to MAX, and confirm
that the waveform for the L/R channels of LINE OUT changes smoothly.
3.
Confirm that the PEAK LED starts to come on when the SENS knob is
turned to 2 o'clock.
4.
Confirm that the waveform disappears when a short plug is inserted into
MIC1(TRS).
5.
Pull out the short plug.
6.
Pull out MIC1(XLR).
7.
Turn SENS of MIC1 to MAX and confirm that the residual noise level for
LINE OUT L/R is -78dBu(JIS-A).
8.
Press the [RIGHT] cursor button and proceed to the next item.
17.SUB MIX
1.
Input a 1kHz 400mVp-p rectangular wave to LINE IN L/R.
2.
Confirm that the waveforms for the L/R channels of LINE OUT appear
and disappear.
3.
Press the [RIGHT] cursor button and proceed to the next item.
18.SUB MIX AUDIO
1.
Input a 1kHz 400mVp-p rectangular wave to LINE IN L/R.
2.
Confirm that waveform is output from LINE OUT L/R.
3.
Press the [RIGHT] cursor button and proceed to the next item.
19.LINE ON/OFF
1.
Input a 1kHz 400mVp-p rectangular wave to LINE IN L/R.
2.
Confirm that the waveforms for the L/R channels of LINE OUT appear
and disappear.
3.
Press the [RIGHT] cursor button and proceed to the next item.
20.LINE AUDIO
1.
Input a 1kHz rectangular wave to LINE IN L/R.
2.
Confirm that the waveform is output from LINE OUT L/R.
3.
Turn the [PHONE VOLUME] knob and confirm that the waveform
changes smoothly.
4.
Pull out the plug for LINE IN L/R.
5.
Confirm that residual noise for LINE OUT L/R is -80dBm(JIS-A) or
under.
6.
Press the [RIGHT] cursor button and proceed to the next item.
21.HARD DISK
Reading, writing and verification of the hard disk is performed.
If no error occurs, it will automatically proceed.
22.CD-RW DRIVE
The firmware and the model name for the CD-RW drive are displayed.
1.
Place the CD-RW(CD-R) media on the tray.
2.
CD-RW writing and verification are performed.
* The test can be performed 99 times with one CD-R.
When using a CD-RW, erase data using CD ERASE of user mode after
testing 99 times.
23.INITIALIZE HDD
* All contents of the hard disk are lost when this item is executed.
If not executing, press the [RIGHT] cursor button and proceed to the next
item.
1.
Pressing the [ENTER] button initializes the hard disk.
2.
If no error occurs "OK" is displayed, and it will automatically proceed to
the next item.
24.POWER OFF
1.
Input signal with level high enough to light up the PEAK LED for
MIC2(XLR).
2.
Press the [POWER] switch for at least 2 seconds.
3.
Confirm that LCD backlight and "PEAK LED" go out.
Check items for user mode
Checking DIGITAL OUT
1.
Connect an instrument with optical DIGITAL IN.
2.
Play the BR-1180 and confirm that the signal is output from DIGITAL
OUT.
BR-1180
19