Roland AC-90 Service Notes page 15

Jul. 2007
5. Test Items
1. Version Display (p. 15)
2. DSP Test (Automatic Determination) (p. 15)
3. Switch Test (p. 15)
4. Volume Control Test (p. 16)
5. Phantom Voltage Test (p. 16)
6. Signal-level Test (Testing in PCB State) (p. 17)
7. Signal-level Test (Testing in Product State) (p. 18)
6. Details of the Test Items
1. Version Display
Version 1.00 1.01
Gt.
●
[CHORUS] —
LED
MIC.
●
[CHORUS] —
LED
[ANTI-
FEEDBACK] — —
LED
●: flashing/—: dark
• Depressing the [TIP] (white) foot switch displays the version, after which
execution advances to the next test item.
2. DSP Test (Automatic Determination)
• When the test is begun, the following LEDs go dark temporarily.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
[MUTE] LED
• As testing progresses, the following LEDs light up sequentially.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
• Test OK (pass): The following LEDs flash.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
[MUTE] LED
• Test not OK (fail): The [MUTE] LED flashes.
* When the test is failed, advancing to the next test items is not possible.
• Depressing the [TIP] (white) foot switch makes execution advance to the
next test item.
1.02 1.03 1.04 1.05 1.06
● ●
— —
● ●
— —
● ● ●
—
3. Switch Test
When the test is begun, the following LEDs go dark.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
[MUTE] LED
Carry out operations in the sequence shown below and check the status
of the corresponding LEDs.
1.
[PICKUP] switch
Changing the [PICKUP] switch from PIEZO to MAGNETIC makes the
GUITAR channel [CHORUS] LED light up.
2.
[SHAPE] switch
Changing the [SHAPE] switch from OFF to ON makes the MIC/LINE
channel [CHORUS] LED light up.
3.
[PHANTOM] switch
Changing the [PHANTOM] switch from OFF to ON makes the [ANTI-
●
FEEDBACK] LED light up.
4.
[SELECT] switch
●
Changing the [SELECT] switch from LINE to MIC makes the [MUTE]
LED light up.
●
5.
GUITAR channel [CHORUS] switch
Changing the GUITAR channel [CHORUS] switch from OFF to ON
makes the GUITAR channel [CHORUS] LED go dark.
6.
MIC/LINE channel [CHORUS] switch
Changing the MIC/LINE channel [CHORUS] switch from OFF to ON
makes the MIC/LINE channel [CHORUS] LED go dark.
7.
[START] switch
Pressing the [START] switch makes the [ANTI-FEEDBACK] LED go
dark.
8.
[MUTE] switch
Changing the [MUTE] switch from OFF to ON makes the [MUTE] LED
go dark.
* If any of the inspection tests up to this point is failed, the [MUTE] LED flashes
and execution cannot advance to the next test.
• If all inspection tests are passed, the following LEDs flash.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
[MUTE] LED
9.
[Foot SW 1] jack switch
• Detaching the plug from [Foot SW 1] on the AC-90 makes the following
LEDs go dark.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
[MUTE] LED
• Inserting a plug into [Foot SW 1] on the AC-90 makes the following LEDs
light up.
GUITAR channel [CHORUS] LED
MIC/LINE channel [CHORUS] LED
[ANTI-FEEDBACK] LED
[MUTE] LED
10. [Foot SW 1] [TIP] switch
Depressing the [TIP] (white) foot switch makes the GUITAR channel
[CHORUS] LED go dark.
11. [Foot SW 1] [RING] switch
Depressing the [RING] (red) foot switch makes the MIC/LINE channel
[CHORUS] LED go dark.
AC-90
15