Roland BOSS KATANA-50 Mk II, Заметки по обслуживанию

Страница: 27 / 41

27
Oct. 2019 KTN-50_2
7.
Verify that the waveform of the signal output from the
PHONES/REC
OUT
jack (L) is as follows.
fig.test- w a v e-2.eps
8.
Disconnect the plug from the
INPUT
, and
PHONES/REC OUT
jacks.
9.
Press
BOOSTER
.
BOOSTER lights up green.
10. Noise Check
1.
Connect a 1/4-inch monaural phone short cable to the INPUT jack.
2.
Turn all knobs all the way counterclockwise.
3.
Attach a load resistor (4 Ω, 300 W) to the speaker terminals (between red
and black).
4.
Connect the noise meter to the speaker terminals and verify that residual
noise is as follows.
Speaker: -42 dBm or less (DIN-Audio)
5.
Connect the noise meter to the PHONES/REC OUT jack (L).
* Connect a 1/4-inch stereo phone plug with 33 Ω load resistors to the PHONES/
REC OUT jack.
6.
Verify that residual noise at the PHONES/REC OUT jack (L) is as follows.
PHONES L: -70 dBm or lower (DIN-audio)