Roland BOSS Flanger BF-3 (T) Service Notes page 11

Jun. 2011
4. CODEC (ADC) L-channel Check
1.
Set the MODE control to STANDARD.
2.
Verify that the CHECK LED is lighted up red.
3.
Connect the oscilloscope to the OUTPUT A and B jacks.
4.
Connect the signal generator to the BASS IN jack and input a signal like
the following.
1-kHz sine wave at -20 dBm
5.
Verify that signals like the following are output from OUTPUT A and B.
fig.005.eps
OUTPUT A: 100 mV/div. and 500 µs/div.
OUTPUT B: 100 mV/div. and 500 µs/div.
6.
Connect the noise meter to the OUTPUT A and B jacks.
7.
Verify that the level of each signal at OUTPUT A and B is at the values
shown below.
-22.5 to -20.5 dBm (JIS-A)
-22.5 to -20.5 dBm (DIN-Audio)
5. CODEC (ADC) R-channel Check
1.
Set the MODE control to ULTRA.
2.
Verify that the CHECK LED is lighted up green.
3.
Connect the oscilloscope to the OUTPUT A and B jacks.
4.
Connect the signal generator to the BASS IN jack and input a signal like
the following.
1-kHz sine wave at -20 dBm
5.
Verify that signals like the following are output from OUTPUT A and B.
fig.006.eps
OUTPUT A: 100 mV/div. and 500 µs/div.
100 mV/div. and 500 µs/div.
OUTPUT B:
6.
Connect the noise meter to the OUTPUT A and B jacks.
7.
Verify that the level of each signal at OUTPUT A and B is at the values
shown below.
-22.5 to -20.5 dBm (JIS-A)
-22.5 to -20.5 dBm (DIN-Audio)
6. Battery Operation Check
1.
Set the MODE control to a setting other than MOMENTARY.
2.
Connect the stabilized power supply to the DC IN jack, then insert the
plug into the GUITAR IN jack.
3.
Set the output voltage of the stabilized power supply to 9.0 V.
4.
Depress the pedal to make the CHECK LED light up.
5.
Set the output voltage of the stabilized power supply to 7.5 V.
6.
Verify that the CHECK LED dims.
7.
Detach the plug from the DC IN jack to disconnect the stabilized power
supply.
8.
Verify that the CHECK LED lights up brightly.
* Be sure to insert new batteries.
9.
Depress the pedal several times, and verify that the CHECK LED
repeatedly lights up and goes dark.
10. While the CHECK LED is illuminated, disconnect the plug from the
GUITAR IN jack.
11. Verify that the CHECK LED goes dark.
7. Noise Check
1.
Turn all controls all the way clockwise (to MAX or ULTRA).
2.
Hold down the pedal and connect the AC adaptor to the DC IN jack.
3.
Verify that the CHECK LED is lighted up orange.
4.
Release the pedal.
5.
Connect the 47-kΩ dummy plug to the GUITAR IN jack.
6.
Connect the amp-equipped monitor speaker to the OUTPUT A and B
jacks.
7.
Drop from a height of about 10 centimeters, and verify that no abnormal
noise is produced.
8.
Connect the noise meter to the OUTPUT A and B jacks.
9.
Verify that each noise level at OUTPUT A and B is at the value shown
below.
-67 dBm or lower (JIS-A) or -65 dBm or lower (DIN-Audio)
10. Set the MODE control to MOMENTARY.
11. Verify that each noise level at OUTPUT A and B is at the value shown
below.
-98 dBm or lower (JIS-A) or -95 dBm or lower (DIN-Audio)
12. Depress the pedal to make the CHECK LED go dark (bypass state).
13. Verify that each noise level at OUTPUT A and B is at the values shown
below.
-103 dBm or lower (JIS-A) or -100 dBm or lower (DIN-Audio)
14. Connect the amp-equipped monitor speaker to the OUTPUT A and B
jacks.
15. Switch the pedal on and off and turn the respective controls, and verify
that no abnormal noise occurs.
BF-3(T)
11