Yamaha P 1000S Service Manual page 29

4. Preparation for BRIDGE mode
Attenuator
Input terminal
MODE switch
SUB WOOFER/LOW CUT switch
YS Processing switch
HPF switch
Load resistor
Connection for measuring: Measure the output at the point as shown below.
SPEAKERS
5. Inspection
5.1 gain
The output voltage shall be +22.1 +/- 1 dBu when input signal is 1 kHz, -10.0 dBu.
5.2 Frequency response
Input signals are each 20 Hz, 1 kHz and 20 kHz, -10 dBu.
The output voltage shall be 0.0 +/- 0.5 dB at 20 Hz, -0.5 +/- 0.5 dB at 20 kHz compared to the 1 kHz.
5.3 Distortion Factor
Input signals are each 20 Hz and 20 kHz.
The distortion shall be less than 0.1 % when output voltage as follows.
This inspection should have been finished within 30 seconds.
P1000S
28.28 V
5.4 Output Noise level
Shunt the input terminal (2pin-hot and 3pin-cold) with 600 ohms.
The noise level of output terminal shall be less than -60 dBu.
Next, set the input attenuator to MIN.
The noise level shall be less than -65 dBu.
6. Preparation of Delivery
Attenuator
MODE switch
SUB WOOFER/LOW CUT switch
YS Processing switch
FREQUENCY
HPF switch
"0" (MAX) Effective only channel A.
cannon connector 2PIN-HOT/3PIN-COLD/1PIN-GND
BRIDGE
OFF (except P1000S)
OFF (except P1000S)
OFF (P1000S only)
8+8 ohms +/- 1 %
A+
R
R
B+
P2500S P3500S
44.72 V 52.92 V
MIN
STEREO
OFF (except P1000S)
ON (except P1000S)
25 Hz (except P1000S)
OFF (P1000S only)
INPUT
MEASURING
8 ohms
INSTRUMENT
GND
8 ohms
P1000S/P2500S/P3500S
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