Roland BOSS Flanger BF-3 (T) Service Notes page 10

Jun. 2011
1. DSP and CPU Check
The DSP and CPU check is carried out automatically. The CHECK LED
lights up green if no problem occurs and flashes red in the event of a
defect.
* If the LED flashes red, operation stops and execution cannot advance to the next
test item. Possible causes include a fault in the peripheral circuitry for the DSP
or CPU, or a soldering defect. Detach the AC adaptor to switch off the power to
the unit.
If the CHECK LED lights up green, follow the procedure below to carry
out a DSP throughput check.
1.
Connect the oscilloscope to the OUTPUT A and B jacks.
2.
Connect the signal generator to the GUITAR IN jack and input a signal
like the following.
200-Hz rectangular wave at 1 Vp-p
3.
Verify that a signal like the following (the same as the input signal) is
output from OUTPUT A and B.
200-Hz rectangular wave at 1 Vp-p
fig.001.eps
500 mV/div. and 1 ms/div
2. Volume Check
Verify that the MODE control is set to MOMENTARY.
* The volume check can be executed only in this sequence: RES -> MANUAL ->
DEPTH -> RATE -> MODE.
RES Volume Check
Slowly turn the RES control from MIN to center, and then to MAX, and
verify that the CHECK LED changes in this sequence: green -> orange ->
green -> orange -> green.
MANUAL Volume Check
Slowly turn the MANUAL control from MIN to center, and then to MAX,
and verify that the CHECK LED changes in this sequence: green ->
orange -> green -> orange -> green.
DEPTH Volume Check
Slowly turn the DEPTH control from MIN to center, and then to MAX,
and verify that the CHECK LED changes in this sequence: green ->
orange -> green -> orange -> green.
RATE Volume Check
Slowly turn the RATE control from MIN to center, and then to MAX, and
verify that the CHECK LED changes in this sequence: green -> orange ->
green -> orange -> green.
MODE Volume Check
Turn the MODE control clockwise by one click at a time, and verify that
the CHECK LED changes in this sequence: green (MOMENTARY) ->
orange (GATE/PAN) -> red (STANDARD) -> green (ULTRA).
10
3. CODEC (DAC) Check
1.
Set the MODE control to GATE/PAN.
2.
Verify that the CHECK LED is lighted up orange.
3.
Connect the oscilloscope to the OUTPUT A and B jacks.
4.
Connect a plug to the GUITAR IN jack.
* A waveform is output even when no signal is input.
5.
Verify that a signal like the following is output from OUTPUT A and B.
200-Hz rectangular wave at 1 Vp-p
fig.002.eps
500 mV/div. and 1 ms/div.
6.
Disconnect the plug from the GUITAR IN jack and connect it to the BASS
IN jack.
7.
Verify that a signal like the following is output from OUTPUT A and B.
400-Hz rectangular wave at 1 Vp-p
fig.003.eps
500 mV/div. and 1 ms/div.
8.
Disconnect the plug from the OUTPUT B jack.
9.
Verify that a signal like the following (delta wave) is output from
OUTPUT A.
fig.004.eps
500 mV/div. and 1 ms/div.
BF-3(T)