Sony SRP-P50 User manual

3
Unit : mm
Mounting on the EIA Standard 19-inch Rack
When mounting on top of another unit, remove the feet at the
base of the unit. (These can be removed easily by pulling out
the pins at the center of the feet with a pair of tweezers,
screwdriver, etc.)
When the rack-mount fixtures are not required, remove the
screws on the side, and remove the fixtures.
DIMENSIONS
WARNING DIMENSIONS
350
81 320 81
482
2626 430
30
44
49.5
28345 22

4
BLOCK DIAGRAM
OVERALL BLOCK DIAGRAM
POWER STAGE
POWER STAGE
OUTPUT
NFB
BIAS
CURRENT
SOURCE
CURRENT
MIRROR
INPUT
–
+
POWER AMPLIFIER BLOCK DIAGRAM
+
+
231
LEVEL
+
–
INPUT 1
BAL/UNBAL PRE AMP
INPUT
LEVEL
+
–+
–
POWER AMP
MONO +
OUTPUT 1
LEVEL
+
–
INPUT 2
BAL/UNBAL PRE AMP
INPUT
LEVEL
+
–+
–
POWER AMP
MONO –
OUTPUT 2
PROTECTION
CIRCUITSPROTECTION
THERMAL
SENSOR
AC INPUT
+
GND
–
CLIP
CLIP
OPERATION
POWER
231

5
LOCATION AND FUNCTIONS OF PARTS
FRONT PANEL
POWER
ON OFF
ATT - CH1 CLIP CLIP
2CH POWER AMPLIFIER SRP-P50
1
5
9
13
17
22
27
32
42
0
ATT - CH2
1
5
9
13
17
22
27
32
42
0
1POWER switch and Pilot lamp
2CHANNEL 1 (MONO) ATT knob
4CLIP indicators
1POWER switch and Pilot lamp
When pressed, the power turns ON and the pilot lamp lights up.
The lamp turns from red to green when the speaker relay
operates. It turns red when the protection circuit is operating.
23ATT knob
A 21-point click attenuator. The 0 point is the reference input level.
During monaural operations, the output level can be adjusted
using the CHANNEL 1 level knob. (In this case, the
CHANNEL 2 level knob does not function.)
4CLIP indicators
Lights up when the output signal is clipped and the distortion
rate reaches approximately 1% (8Ω, 1 kHz).
The Function of Protection Circuit
In the following cases, the protection circuit operates to cut the output
to protect the speakers and amplifier. The pilot lamp also lights upin
red.
• When the speaker output terminal is short-circuited, and
signal is output.
• When the DC (direct current) is output to the speaker output
terminal due to malfunctions
• When the temperature of the radiator in the amplifier exceeds
the regulated temperature
In these case, turn OFF the POWER switch, find the cause
and resolve the problem. Then turn ON the POWER switch
again.
3CHANNEL 2 ATT knob
BLOCK DIAGRAM LOCATION AND
FUNCTIONS OF PARTS

6
REAR PANEL
LOCATION AND FUNCTIONS OF PARTS
5INPUT terminals
Inputs signals to the unit from the mixer, AV equipment,
etc.
CH1 INPUT (MONO) : During stereo operations, serves
as the CHANNEL 1 input terminal. During monaural
operations, connect here.
CH2 INPUT : During stereo operations, serves as the
CHANNEL 2 input terminal. During monaural
operations, this is separated from the signal path.
XLR connector (Equivalent to XLR3-31) : When the
BAL/UNBAL switch is set to BAL, balanced type
signals are input.
Phono jack (Unbalanced type) : When the BAL/
UNBAL switch is set to UNBAL, signals are input
from the Phone jack .
Pin 3 of the XLR connector is short-circuited to
ground inside to receive UNBAL signals.
6OPERATION switch
Switches between stereo and monaural. During stereo
operations, set to STEREO. During monaural operations,
set to MONO, and at the same time, change the speaker
terminal wirings.
Be sure the Power switch is turned off before
setting this switch.
BAL/UNBAL
switch
CH1 INPUT (MONO)/CH2 INPUT
XLR connector
ON
(unbalanced)
Phono jack
OFF
ON
BAL side
UNBAL side
Balanced type
1: GND
2: HOT
3: COLD
1
3
2
Adjust together.
Press here to release
STEREO
MONO
OPERATION CH2 INPUT
BAL
UNBAL
CH1 INPUT(MONO)
BAL
UNBAL
LEVELLEVEL
0dBs
- 10
0dBs
- 10
UNBALANCED
(STACKING)
7INPUT LEVEL selector switches
8BAL/UNBAL selector switches
6OPERATION switch
5INPUT terminals

7
9Speaker output terminals
For connecting speakers. Connect the (+) of the speakers to
the red terminal, and the (–) of the speakers to the black
terminal. In monaural connection, use only the red
terminals. In this case, connect the (+) of the speaker to the
red terminal of CH1 and the (–) of the speaker to the red
terminal of CH2.
7INPUT LEVEL selector switches
Switch according to the reference output level of the
equipment connected.
0 dBu : For professional audio equipment, etc.
–10 dBu: For general consumer audio and video
equipment, etc.
8BAL/UNBAL selector switches
When set to UNBAL, signals can be input from the Phono
jack.
At this time, signals (UNBAL) input from the XLR
connector can be output from the Phono jack because it is
connected to the XLR connector inside, thus enabling
stacking. When connecting to this unit, take note that the
cable specifications may differ according to the equipment
connected.
Input cords for stacking connection.
本機

PHONO
SRP-E1500,E110
200LC
X3900
Z800
P50
XLR-3-11C相当 XLR-3-12C相当
SRP-X1008
X6004
V300
シリーズ
X5000A
XLR-3-12C相当
本機

This unit
Equivalent to XLR-3-12C
This unit
Equivalent to
XLR-3-11C
Equivalent to XLR-3-12C
series
9SPEAKER OUTPUT terminals
AC INPUT
LOCATION AND
FUNCTIONS OF PARTS
+CH2 CH1 -
MONO
SPEAKERS

9
The lamp does not light up and no sound is produced even
when the POWER switch is pressed
The pilot lamp is ON, but no sound
No sound is produced from the speakers
The volume from the left and right speakers differ
When stereo, the left and right positions of each musical
instrument are reversed
Hum or noise
The presence of the bass sound is bad
TROUBLESHOOTING GUIDE
Is the AC power cord disconnected?
•Are the speakers connected properly?
•Are the inputs of the mixer and pre-amplifier switched
properly?
•Are the volume adjusting knobs of the mixer and pre-
amplifier turned excessively?
•Is the BAL/UNBAL selection switch of the unit set
properly?
•Is the speaker cord short-circuited somewhere?
•Are the ventilation on the top or side of the unit OK?
Avoid closed-type rack mounts to allow proper ventilation.
AAs the protection circuit is operating, turn OFF the
POWER switch once, and correct the cause.
•Is the mixer or pre-amplifier output balanced?
•Is the level knob of the unit adjusted properly?
•Is the INPUT LEVEL selection switch of the unit set
properly?
•Is the connection of the left and right speaker cords
reversed?
•Is the connection of the cord to the INPUT terminal
reversed between channels?
•Are the speaker output terminals and connection cords
connected properly?
•Is the OPERATION switch set properly?
The pilot lamp
blinks in red
The pilot lamp
lights up in red
MAIN SPECIFICATIONS TROUBLESHOOTING
GUIDE

Printed in Japan