Yamaha P 2500 Service Manual

							21
P1000S/P2500S/P3500S
B
B
Pattern side
Addition: CAP POLYESTER FILM 0.056u 50V VV062500 (C465)
 DC Circuit Board (X3499B0)
¢Í»”ï£ 
						

							P1000S/P2500S/P3500S
22
CCto DC-W403
to DC-W401
to DC-W402
  PA Circuit Board
D
D 
						

							23
P1000S/P2500S/P3500S
D
D
CCto OUT2-W606
to OUT2-W604
to DC-CN414
not used
(for current check B)
not used
(for current check A)
Component side
Pattern side
Following semi-conductors
are installed for the PA unit.
ref.
PR101 Q101
Q124N
Q126N
Q128N
Q130N Q130P
Q128P
Q126P
Q124P D126
Q133N
Q134N
Q132N Q118
Q120
Q122D133
D134
Q123
Q121
Q119
Q132P
Q134P
Q133P D127
Q125P
Q127P
Q129P
Q131P
Q131N
Q129N
Q127N
Q125N Q102
PR102 P1000S P2500S P3500S
: installed : not installed
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¼£
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							P1000S/P2500S/P3500S
24
BRIDGE
to PA-CN106
to DC-CN412 (P2500S, P3500S only)
(P2500S, P3500S only) to DC-CN416
SPEAKERS BSPEAKERS A
TEMPPROTECTIONPOWER CLIP A
CLIP B
SIGNAL A SIGNAL BYS Processing
(P2500S, P3500S only)
11
SPEAKERS B
SPEAKERS A
32 23
to IN-W301A
to PA-CN105 not installed
  SUB (OUT2) Circuit Board
Component side
 SUB (OUT1) Circuit Board
 SUB (LED) Circuit Board
Component side Component side
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¼£
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æ
¼£
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æ
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							25
P1000S/P2500S/P3500S
Pattern side
Pattern side
 
SUB (OUT2) Circuit Board
 SUB (OUT1) Circuit Board
 SUB (LED) Circuit Board
Pattern side
¢Í»”ï£
¢Í»”ï£ ¢Í»”ï£ 
						

							P1000S/P2500S/P3500S
26
INSPECTIONS
1. Scope
This inspection specifications is applied to the power amplifier P1000S/P2500S/P3500S.
2. Preparation for STEREO/PARALLEL mode
AttenuatorÒ0Ó (MAX)
Input terminal cannon connector 2PIN-HOT/3PIN-COLD/1PIN-GND
MODE switch STEREO
SUB WOOFER/LOW CUT switch OFF (except P1000S)
YS Processing switch OFF (except P1000S)
HPF switch OFF (P1000S only)
Load resistor 8 ohms +/- 1 %
Unless otherwise specified, the operation shall be both channels drive.
DIN AUDIO filter shall be used for the noise level measurements.
Unless otherwise specified, the input signal shall be high quality sine \
wave.
3. Inspection and Adjustment
3.1 POWER LED, PROTECTION LED and Power on muting time
POWER LED and PROTECTION LED shall light when the POWER switch is turned on.
2.5 +/- 1 seconds after the power switch is turned on, PROTECTION LED shall lights off.
3.2 Fan and TEMP LED
The fan shall operate when short circuit on the two jumper wires that mounted of DC circuit board marked ÒFAN-CÓ.
The TEMP LED shall lights up when short circuit on the two jumper wires that marked ÒTM-CÓ.
3.3 Idle current
Connect the input terminal to the GROUND and adjust VR101(A channel) and VR102(B channel) that the DC voltage
of Vb between the pin1 and pin2 of CN108(A channel) and the CN107(B chan\
nel) shall be 0.5 +/- 0.1 mV.
After finishing all inspections, adjust the Vb again to 0.5 +/- 0.1 mV.
3.4 DC Voltage of output terminal
Connect the input terminal to the GROUND and measure the DC voltage Vdc of the output terminal shall be 0 +/- 75 mV.
3.5 Gain
The output voltage should be +22.1 +/- 0.5 dBu when input signal is 1 kHz, -10.0 dBu\
.
This inspection shall be performed on PARALLEL mode.
DonÕt feed input signal to channel B on PARALLEL mode.
Set the input attenuator to -10 dB.Input signal is 1 kHz, -10 dBu.
The output voltage shall be 12.0 +/- 3.0 dB.
3.6 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 compa\
red to the 1 kHz.

The inspection process of SUB WOOFER and LOW CUT position as follows. 1) channel A 25 Hz
2) channel A 150 Hz
3) channel B 25 Hz
4) channel B 150 Hz 
						

							27
P1000S/P2500S/P3500S
 SUB WOOFER position (except P1000S)

Input signal is 25 Hz, -10 dBu, and set FREQUENCY to 25 Hz.
The output voltage shall be -3.0 +/- 2.0 dB compared to the 1 kHz at the switch off.

Input signal is 150 Hz, -10 dBu, and set FREQUENCY to 150 Hz.
The output voltage shall be -3.0 +/- 2.0 dB compared to the 1 kHz at the switch off.
 LOW CUT position (except P1000S)

Input signal is 25 Hz, -10 dBu, and set FREQUENCY to 25 Hz.
The output voltage shall be -4.2 +/- 2.0 dB compared to the 1 kHz at the switch off.

Input signal is 150 Hz, -10 dBu, and set FREQUENCY to 150 Hz.
The output voltage shall be -4.0 +/- 2.0 dB compared the 1 kHz at the switch off.
 YS Processing switch: ON (except P1000S)
Input signal is 70 Hz, -10 dBu.
The output voltage shall be +6.5 +/- 1.5 dB compared to the 1 kHz at the YS Processing switch off, and the YS
Processing LED shall lights up.

 HPF switch: ON (P1000S only)
Input signal is 40 Hz, -10 dBu.
The output voltage shall be -3.0 +/- 2.0 dB compared the 1 kHz at the switch off.
3.7 Distortion Factor
Input signals are each 20 Hz and 20 kHz.
The distortion shall be less than 0.1 % when output power level as follows.
This inspection should have been finished within 30 seconds.
3.8 Cross talk
Input signal is 1 kHz to the channel A, and shunt the input terminal of channel B with 600 ohms. Set the output power
of channel A as follows.
The output voltage of channel B shall be less than -70 dB compared to output voltage of channel A. The conditions of
channel A and channel B are replaced and inspected.
3.9 Output Noise level
Shunt the input terminal with 600 ohms.
The noise level of the output terminal shall be less than -65 dBu.
Set the input attenuator to MIN. The noise level shall be less than -70 dBu. P1000S P2500S P3500S
100 W + 100 W 250 W + 250 W 350 W + 350 W
P1000S P2500S P3500S 50 W 125 W 175 W 
						

							P1000S/P2500S/P3500S
283.10 Stability
Connect 4 ohms load resistor with the capacitance of 10 pF-0.47 uF to ou\
tput 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: within 5 waves
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: within 7 waves and no oscillation
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.
(2) The primary electrical power shall be as follows when shunt the input terminal with 600 ohms.
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.
3.14 SIGNAL LED
SIGNAL LED shall lights up when input signal is 1 kHz, -23 dBu.P1000S P2500S P3500S
130 +/- 20 W 130 +/- 20 W 130 +/- 20 W
P1000S P2500S P3500S
15 +/- 10 W 20 +/- 10 W 25 +/- 10 W
P1000S P2500S P3500S
6.5 +/- 3 V 13 +/- 3 V 16 +/- 4 V
Vo
Vp 
						

							29
P1000S/P2500S/P3500S
4. Preparation for BRIDGE mode
Attenuator Ò0Ó (MAX) Effective only channel A.
Input terminal cannon connector 2PIN-HOT/3PIN-COLD/1PIN-GND
MODE switch BRIDGE
SUB WOOFER/LOW CUT switch OFF (except P1000S)
YS Processing switch OFF (except P1000S)
HPF switch OFF (P1000S only)
Load resistor 8+8 ohms +/- 1 %
Connection for measuring: Measure the output at the point as shown below.
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 compa\
red 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.
5.4 Output Noise level
Shunt the input terminal 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 MIN
MODE switch STEREO
SUB WOOFER/LOW CUT switch OFF (except P1000S)
YS Processing switch OFF (except P1000S)
FREQUENCY 25 Hz (except P1000S)
HPF switch OFF (P1000S only)
SPEAKERS
A+
B+
R 8 ohms
R 8 ohms
INPUT
GND
MEASURING
INSTRUMENT
P1000S P2500S P3500S
28.28 V 44.72 V 52.92 V 
						

							P1000S/P2500S/P3500S
30 &;
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