Sony SRP-P50 User manual

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

49.5

28345 22

BLOCK DIAGRAM

OVERALL BLOCK DIAGRAM

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

OPERATION

POWER

231

LOCATION AND FUNCTIONS OF PARTS

FRONT PANEL

POWER

ON OFF

ATT

CH1 CLIP CLIP

2CH POWER AMPLIFIER SRP-P50

ATT

CH2

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

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

(unbalanced)

Phono jack

OFF

BAL side

UNBAL side

Balanced type

1: GND

2: HOT

3: COLD

Adjust together.

Press here to release

STEREO

MONO

OPERATION

CH2 INPUT

BAL

UNBAL

CH1 INPUT(MONO)

BAL

UNBAL

LEVELLEVEL

0dBs

UNBALANCED

(STACKING)

7INPUT LEVEL selector switches

8BAL/UNBAL selector switches

6OPERATION switch

5INPUT terminals

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

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

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