Roland BK-5 Service Notes page 38

Jan. 2012
1. Produce following wave with external Waveform generator:
Wave generator OUT L:
Wave generator OUT R:
2. Check the following values on the oscilloscope:
OSCILLOSCOPE SETUP:
Volt div. = 5.00V / Time div. = 1.00ms
3. Keep pressed VARIATION 1] button and verify that the waveforms are completely nil:
6. Press [START/STOP] button to go to next test.
16. Noise check
The display shows:
Setting:
•
Remove all connections from BK-5 sockets.
•
Connect the mono audio cable first from OUTPUT L/MONO then from OUTPUT R to Noise Meter's input.
4
Freq =1Khz (sine wave) Amplitude=2,5Vpp (measured with cable not connected to BK-5)
Freq =1Khz (sine wave) Amplitude=2,5Vpp (measured with cable not connected to BK-5)
CH1 = OUTPUT LEFT
It must be 1000hz (± 20)
It must be 6.00 Vpk (±1.00 Vpk)
CH2 = OUTPUT RIGHT
It must be 1000hz (± 20)
It must be 3.00 Vpk (±0.50 Vpk)
When you measure the OUTPUT L
insert an empty jack on OUTPUT R.
When you measure the OUTPUT R
insert an empty jack on OUTPUT L.