Yamaha P1000S Service Manual page 28

P1000S/P2500S/P3500S
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3.10 Stability
Connect 4 ohms load resistor with the capacitance of 10 pF-0.47 uF to output terminal.
Input signal is 10 kHz, -10 dBu square wave.
The overshoot and the ringing should be as follows.
Overshoot Vp/Vo < 1.8
Ringing:
Next, connect only capacitance of 10 pF-0.47 uF to output terminal.
The overshoot and the ringing should be as follows.
Overshoot Vp/Vo < 2.5
Ringing:
3.11 Protection circuit for DC fault
Disconnect of load resistor from output terminal.
PROTECTION LED shall not light up when input signal is 10 Hz, +9.0 dBu.
PROTECTION LED shall light up less than 2 seconds when input signal is 1 Hz, 5.0 dBu.
The LED shall light off less than 10 seconds when the input signal was cut.
3.12 Efficiency
(1) The primary electrical power shall be as follows when input signal is 1 kHz, -6.6 dBu.
P1000S
130 +/- 20 W
(2) The primary electrical power shall be as follows when shunt the input terminal with 600 ohms.
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L 13942296513
P1000S
15 +/- 10 W
3.13 VI limiter and compressor
Connect 1 ohm(+/- 5 %) load resistor to output terminal.
Input signal is 1 kHz, -1.5 dBu.
The output voltage shall be as follows and the distortion shall be less than 5 %.
Then, CLIP LED shall light up.
This inspection should have been finished within 30 seconds.
P1000S
6.5 +/- 3 V
3.14 SIGNAL LED
SIGNAL LED shall lights up when input signal is 1 kHz, -23 dBu.
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within 5 waves
within 7 waves and no oscillation
P2500S P3500S
130 +/- 20 W 130 +/- 20 W
P2500S P3500S
20 +/- 10 W 25 +/- 10 W
P2500S P3500S
13 +/- 3 V 16 +/- 4 V
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