26
Oct. 2019
KTN-50_2
9. Signal Level Check
INPUT -> PHONES L/R
BOOSTER
,
CH1
,
CH2
light up red and
MOD
light up green. (AF Hi)
1.
Turn the
MASTER
knob to minimum, and the
POWER CONTROL
knob
to
STANDBY
.
2.
If all the 8 knobs from
GAIN
to
MASTER
are not turned to maximum,
then turn them all to maximum.
3.
Connect the oscilloscope and the noise meter to the
PHONES/REC OUT
jack (L).
* Connect a 1/4-inch stereo phone cable with 33 Ω load resistors to the
PHONES/
REC OUT
jack.
4.
Connect the oscillator to the
INPUT
jack and input a signal like the
following.
INPUT:
1-kHz sine wave at -40 dBm
* Do not input the signal (sine wave) continuously for over five minutes or else
the product may get damaged. This is the same in the following steps.
5.
Verify that no signal is output from the
PHONES/REC OUT
jack (L).
6.
Adjust the
MASTER
knob to center. (AF Hi)
7.
Verify that a signal like the following is output from the
PHONES/REC
OUT
jack (L).
PHONES L: 1-kHz sine wave at -7.0±1.5 dBm (flat)
8.
Adjust the
MASTER
knob to maximum, and the
VOLUME
knob to
minimum. (AF Hi)
9.
Verify that a signal like the following is output from the
PHONES/REC
OUT
jack (L).
PHONES L: 1-kHz square wave at +8.5±1.5 dBm (flat)
10.
Adjust the
VOLUME
knob to maximum and press
BOOSTER
.
BOOSTER
lights up green. (AF-Lo)
11.
Verify that a signal like the following is output from the
PHONES/REC
OUT
jack (L).
PHONES L: 1-kHz sine wave at -29.5±1.5 dBm (flat)
12.
Connect the oscilloscope and the noise meter to the
PHONES/REC OUT
jack (R).
* Connect a 1/4-inch stereo phone cable with 33 Ω load resistors to the
PHONES/
REC OUT
jack.
13.
Connect the oscillator to the
INPUT
jack and input a signal like the
following.
INPUT:
1-kHz sine wave at -20 dBm
14.
Verify that a signal like the following is output from the
PHONES/REC
OUT
jack (R).
PHONES R: 1-kHz sine wave at -9.0±1.5 dBm (flat)
15.
Disconnect the plug from the
INPUT
jack.
16.
Connect the oscillator to the
POWER AMP IN
jack and input a signal like
the following.
POWER AMP IN:1-kHz sine wave at -20 dBm
17.
Verify that a signal like the following is output from the
PHONES/REC
OUT
jack (R).
PHONES R: 1-kHz sine wave at -9.0±1.5 dBm (flat)
18.
Disconnect the plug from the
POWER AMP IN
and
PHONES/REC OUT
jacks.
AUX IN -> Speaker
1.
Disconnect the speaker terminals from the speaker, and attach a load
resistor (4 Ω, 300 W) to the speaker terminals (between red and black).
2.
Connect the oscilloscope and the noise meter to the speaker terminals.
* Connect the black line to the GND of the measuring device, and red line to the
signal line.
3.
Connect the oscillator to the
AUX IN
jack and input a signal like the
following to both L and R simultaneously.
AUX IN L/R:100-Hz sine wave at -20 dBm
4.
Adjust the
POWER CONTROL
knob to
50 W
, and the
MASTER
knob to
maximum.
* When feeding the signal, do not leave the
POWER CONTROL
knob to
positions other than
STANDBY
for over five minutes, or else the product may
get damaged. If the testing takes time, return it to
STANDBY
for a while. This
is the same in the following steps.
5.
Verify that a signal like the following is output from the speaker
terminals.
Speaker:
100-Hz sine wave at +21.0±1.5 dBm (flat)
6.
Input a signal like the following to the
AUX IN
jack. (change the
frequency)
AUX IN L/R:
10-kHz sine wave at -20 dBm
7.
Verify that a signal like the following is output from the speaker
terminals.
Speaker:
10-kHz sine wave at +24.5±1.5 dBm (flat)
8.
Input a signal like the following to the
AUX IN
jack. (change the
frequency)
AUX IN L/R:
1-kHz sine wave at -20 dBm
9.
Verify that a signal like the following is output from the speaker
terminals.
Speaker:
1-kHz sine wave at +18.0±1.5 dBm (flat)
10.
Set the
POWER CONTROL
knob to
25 W
.
11.
Verify that a signal like the following is output from the speaker
terminals.
Speaker:
1-kHz sine wave at +12.5±1.5 dBm (flat)
12.
Set the
POWER CONTROL
knob to
0.5 W
.
13.
Verify that a signal like the following is output from the speaker
terminals.
Speaker:
1-kHz sine wave at -2.0±1.5 dBm (flat)
14.
Set the
POWER CONTROL
knob to
STANDBY
.
15.
Verify that no signal is output from the speaker terminals.
16.
Detach the oscillator.
* The load resistor of the speaker terminals is continued to be attached for the next
test item.
Waveform (Speaker/PHONES)
1.
Connect the oscillator to the
INPUT
jack and input a signal like the
following.
INPUT:
1-kHz sine wave at -10 dBm
2.
Set the
POWER CONTROL
knob to
50 W
, and the
MASTER
knob to
maximum.
3.
Verify that the waveform of the signal output from the speaker terminals
is as follows.
fig.test-
w
a
v
e-1.eps
4.
Detach the oscilloscope and the noise meter.
* Be very careful so that the speaker terminals never touch to the other conductive
portion.
5.
Connect the oscilloscope to the
PHONES/REC OUT
jack (L).
* Connect a 1/4-inch stereo phone cable with 33 Ω load resistors to the
PHONES/
REC OUT
jack.
6.
Input a signal like the following to the
INPUT
jack.
INPUT:
1-kHz sine wave at 0 dBm
Содержание BOSS KATANA-50 Mk II
Страница 16: ...16 Oct 2019 KTN 50_2 Block Diagram fig block 50 eps L ...
Страница 17: ...17 Oct 2019 KTN 50_2 fig block 50 eps R ...
Страница 28: ...28 Oct 2019 KTN 50_2 Circuit Board Main Board fig b main A eps fig b main B eps ...
Страница 29: ...29 Oct 2019 KTN 50_2 ...
Страница 36: ...36 Oct 2019 KTN 50_2 Circuit Board Panel Amp Input Fuse Board fig b 50 panel eps ...
Страница 37: ...37 Oct 2019 KTN 50_2 ...
