Roland BK-5 Service Notes page 37

2. Remove jack from OUTPUT R and make sure the Right channel is mixed with Left channel (Mono function);
Check the following values on the oscilloscope:
3. Insert again the jack into the BK-5 OUTPUT R socket.
4. Keep [VARIATION 2] pressed button and verify that the waveforms are completely nil:
5. Press [START/STOP] button to go to next test.
15. Audio Input socket check
The display shows:
Setting:
•
Connect the n.2 Mono Audio Cables from BK-5 EXT INPUT to the Waveform generator.
•
Connect the BK-5 OUTPUT L/R to oscilloscope's CH1-CH2 inputs.
Measure
2,5Vpp here
(just out from
Wave
generator).
The cable must
not be
connected to
BK-5 INPUT
Connect to JM-5 AUDIO INPUT (stereo)
Wave generator n.1
Wave generator
out = 2,00 Vpp
2,5 Vpp
- +
10K
33K
Gnd
R
L
3,5 plug type
BK-5
CH1 = OUTPUT LEFT
The 2Khz Right signal is mixed with
1Khz Left signal
CH2 = OUTPUT RIGHT
No signal
BK-5