15
XH150
INSPECTIONS
A STEREO and PARALLEL Operation
Before performing any of the following adjustments, set the unit as follows:
1. ATTENUATIONS Maximum
2. Input terminal: Cannon connector pin 2 is HOT, pins 1 and 3 are GROUND
3. OUTPUT VOLTAGE switch: 100 V
4. Output terminal: RL = 32 and 64 ohm/more than 150 W
5. Others: Both Channel operations are required, if there is no particular indication. In addition, turn off the
filter switches if there is no particular indication. Do not connect the ground of the speaker terminal
to the ground on the input side.
Adjustment Specifications
1. Fan Test
When turning on the power switch, confirm that both fans on the right and left sides regulate at low speed.
2. Muting Test
After applying power to the unit, the PROTECTION indicator should remain ON for 2.5 +/- 1 second, to indicate that the protection circuitry
is operating and the indicator should go out. NO signal is output while this indicator is lit.
3. Idle Current Test
Connect the input terminal to the GROUND and adjust the VR201 (A channel +), VR202 (A channel -), VR301 (B channel +) and
VR302 (B channel -) so that the DC voltage Vb between pin 1 and pin 2 of the CN203 (A channel +), CN204 (A channel -), the CN303
(B channel +) and the CN304 (B channel -) should be 1.0 +/- 0.2 mV. After finishing all tests, adjust the Vb again to 1.0 +/- 0.2 mV.
4. Input Terminal DC offset
Connect the input terminal to the GROUND and check that the DC voltage Vdc of the output terminal is 0 +/- 75 mV.
5. Gain Test
Check that the OUTPUT is + 28.2 +/- 0.5 dBu when a sine wave of 1 kHz at -10 dBu is applied to the INPUT.
6. Frequency Response Test
HIGH CUT switch and LOW CUT switch OFF:
When a sine wave of 20 Hz, 1 kHz or 20 kHz at -10 dBu is applied to the INPUT, check that the output is 0.0 +/- 0.5 dB at 20 Hz and
- 0.5 +/- 0.5 dB at 20 kHz using 1 kHz as a reference.
<5 kHz>
When a sine wave of 5 kHz, - 10 dBu is applied to the INPUT, check that the output is - 3.5 +/- 1.0 dB using 1 kHz as a reference at the
filter switch OFF.
<10 kHz>
When a sine wave of 10 kHz, - 10 dBu is applied to the INPUT, check that the output is - 3.0 +/- 1.0 dB using 1 kHz as a reference at the
filter switch OFF.
<40 Hz>
When a sine wave of 40 Hz, - 10 dBu is applied to the INPUT, check that the output is - 3.0 +/- 1.0 dB using 1 kHz as a reference at the
filter switch OFF.
<80 Hz>
When a sine wave of 80 Hz, - 10 dBu is applied to the INPUT, check that the output is - 3.5 +/- 1.0 dB using 1 kHz as a reference at the
filter switch OFF.
7. Harmonic Distortion Test
When a high quality sine wave is applied at 20 Hz, 1 kHz, or 20 kHz, the harmonic distortion should be as follows:
*This test should be finished within 30 minutes.
Power output level
THD
20 Hz 1 kHz 20 kHz
XH150
150 W + 150 W (39.0 dBu/ch, 32 ohm, switch=70V)
150 W + 150 W (42.0 dBu/ch, 64 ohm, switch=100V)
<= 0.1 % <= 0.1 % <= 0.1 %
<= 0.1 % <= 0.1 % <= 0.1 %
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