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)
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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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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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25
P1000S/P2500S/P3500S
Pattern side
Pattern side
 
SUB (OUT2) Circuit Board
 SUB (OUT1) Circuit Board
 SUB (LED) Circuit Board
Pattern side
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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...

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...

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...

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....

P1000S/P2500S/P3500S
30 &;
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