Roland BOSS RT-20, Заметки по обслуживанию

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18
Dec. 2005 RT-20
11. DSP Route FET Switch Working Check
1.
Press the right pedal to start the DSP Route FET Switch Working
Check .
fig.11-DSPSW-panel
2.
Confirm the output wave disappears and be like the following picture.
fig.11-DSPSW-1_70(200 mV/DIV, 1 ms/DIV)
12. Bypass Route Residual Noise Check
1.
Press the right pedal to start the Bypass Route Residual Noise Check .
fig.12-BYPNOISE-panel
2.
Connect the 47-k
Ω
short plugs to INPUT A (MONO) and INPUT B.
3.
Connect the noise meter to OUTPUT A (MONO) and measure the
residual noise.
Passing Value: -91 dBu or less (JIS-A)
4.
Connect the noise meter to OUTPUT B and measure the residual noise.
Passing Value: -91 dBu or less (JIS-A)
5.
Connect the noise meter to PHONES (L, R) and measure the residual
noise.
Passing Value: -91 dBu or less (JIS-A)
6.
Connect monitor speakers to OUTPUT A (MONO) and OUTPUT B.
7.
Give a shock (hard vibration) to the RT-20’s body, and confirm any
abnormal noise are not generated from OUTPUT A (MONO), OUTPUT B
or PHONES (L, R).
13. DSP Through Route Residual Noise
Check
1.
Press the right pedal to start the DSP Through Route Residual Noise
Check .
fig.13-DSPNOISE-panel
2.
Connect the noise meter to OUTPUT A (MONO) and measure the
residual noise.
Passing Value:
-84 dBu or less (JIS-A)
3.
Connect the noise meter to OUTPUT B and measure the residual noise.
Passing Value: -84 dBu or less (JIS-A)
4.
Connect the noise meter to PHONES (L, R) and measure the residual
noise.
Passing Value:
-84 dBu or less (JIS-A)
5.
Connect monitor speakers to OUTPUT A (MONO) and OUTPUT B.
6.
Give a shock (hard vibration) to the RT-20’s body, and confirm any
abnormal noise are not generated from OUTPUT A (MONO), OUTPUT B
or PHONES (L, R).
14. Battery Working Check
1.
Remove the AC adaptor to turn off the power.
2.
Put batteries into the battery box and connect a plug to INPUT A
(MONO).
3.
Check the
POWER
LED lights.
200mV/DIV, 1ms/DIV