Yamaha p1150 Service Manual page 3

PI
1
50/Pl 250/P21 50/P2250
P1250
Output Power
Specs
meet
FTC
preconditioning
criteria
OUTPUT
SPECIFICATIONS
8
ohms
1
4
ohms
1
20Hz
-
20kHz
1kHz 20Hz
-
20kHz 1kHz
Continuous
sine
wave
output
power
at less
than 0.05%
THD
170W
185
W
250
W
265
W
Total
Harmonic
Distortion
(THD)
<0.007%
@85
W
<
0.003%
(3185
W
<0.01%
@125
W
<0.005%
@
125
W
Intermodulation
Distortion
(IHD)
60 Hz
&
7
kHz
4
:
1
<
0.005%
(S)
85
W
<0.01% @
125
W
Power Bandwidth
(@
THD
*^0.1%)
10
Hz
to 100
kHz
@
85
W
10
Hz
to
100
kHz
@
125
W
Frequency Response
(1
watt output)
+0.-1
dB, 10
Hz
to
50 kHz
Damping
Factor
>110(31
1
kHz
>55@
1
kHz
Slew Rate
±50
volts/microsecond
full
swing
Signal-to-Noise (Input shorted)
>110dB,
-6dB/octave LPF
(s>
12.47
kHz
>115dB,
IHF-A
network
Residual Noise
(Input
ATT
@>
minimum)
<-80
dBm, -6dB/octave LPF
(§1
12,47
kHz
<—
90dBm,
IHF-A network
Input
Impedance
>15
kohms,
balanced or
unbalanced (ATT
@
max)
Sensitivity
+4
dBm
(1.23
V
rms) for
nominal output
(4
ohm
load)
Voltage Gain 28.3
dB
Indicators
Signal:
Green
LED
turns
on
when
signal
present
at
output
is
at
or above 2
volts
RMS
(20
Hz
-
20 kHz),
Clipping:
Red
LED
turns
on
when
THD >1%.
Protection:
Red
LED
turns
on
when
protection
or
muting
is
on.
Pilot:
Red LED
turns
on
when
power
is
on.
Protection Circuits
Muting:
Output muted
6 seconds (±2
sec.) after
power
is
on,
DC
sense:
Output
shut off
if
±2V DC
sensed
at
output.
Thermal:
Output
shut off
if
heat sink temp.
>85
degrees
C.
Current
Limiter:
Output
reduced
if
load
<2
ohms.
Fan
Circuit
Fan
is
normally
at
low
speed;
when
heat sink reaches
60
degrees
Centigrade, fan goes to high speed; then
resets to
low
at
45°C.
Controls
Front:
32
step Input Attenuator; 0 to
—20
dB
in
1
dB
steps,
-20
to
-30
dB
in
2
dB
steps,
then -33, -37, -42, -50,
-60
dB, and
infinite
attenuation.
Push
On/Push
Off
POWER
switch.
Power Requirements
105-
130
volts,
50
or
60
Hz,
AC, 400
W
(450
VA)
Weight 33
lbs
(15 kg)
Dimensions Width: 18-7/8
inches (480
mm)
Height: 5-1/4 inches (132
mm)
Overall
Depth:
16-3/4 inches (423
mm)
Depth
Behind Front Panel: 15-1/8 inches (384
mm)
Accessory Rubber cap
to
discourage unauthorized or
accidental changes
in
setting of input attenuator (included).