Soundcraft GP1 USER GUIDE

USER GUIDE

Parts of the design of this product may be protected by worldwide patents.

Part No ZM0055/01

Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. Soundcraft Electronics Ltd. shall not be liable for loss or damage whatsoever arising from the use of information or any error contained in this manual.

No part of this manual may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any purpose without the express written permission of Soundcraft Electronics Ltd.

It is recommended that all maintenance and service on the product should be carried out by Soundcraft Electronics Ltd. or its authorised agents. Soundcraft Electronics Ltd cannot accept any liability whatsoever for any loss or damage caused by service, maintenance or repair by unauthorised personnel.

Soundcraft Electronics Ltd. Cranborne House, Cranborne Road, Cranborne Industrial Estate, Pottersbar, Herts., EN6 3JN England.

Tel: 0707 665000

Fax: 0707 660482

Table of Contents

Introduction 1

Introduction to the GP1 2

Precautions and Safety Instructions 3

PPS110 Circuit Diagram 6

Connections 7

Block Diagrams 9

Block Diagram - Inputs 10

Block Diagram - Outputs 11

Mono Input Module 13

Mono Input Module 14

Std Stereo Line Input 17

Standard Stereo Line Input Module 18

Basic Stereo Line Input 21

Basic Stereo Line Input Module 22

Master Section 25

Master Section 26

Monitor Module 29

Monitor Module 30

Appendices 33

Technical Specifications 34

Dimensions 35

Warranty 36

Introduction

Introduction 1

Introduction to the GP1

Overview

The GP1 Location Broadcast Mixer is available in three frame sizes: 6, 8 and 12 Input Modules. The GP1 also has an Output & Meter Master Module ,and a Monitor Module.

The Output meters are VU or PPM.

The GP1 is lightweight, for portability, whilst also being rugged.

The power consumption is low to ensure a long usable life for the internal batteries (typically 8-10 hrs from Ni-Cd cells, and 15-20 hrs from alkaline cells - both figures for the 12 Input version).

Although the GP1 is primarily designed for remote use with on-board battery power, the mixer may also be rack mounted (8 Input variant only), or furniture mounted. It may be mains powered via the PPS110 power supply.

2 Introduction

Precautions and Safety Instructions

General Precautions Avoid subjecting the mixer to conditions of excessive heat or cold, or installing it

in positions where it is likely to be subject to vibration, dust or moisture. Do not use any liquids to clean the fascia of the unit: a soft dry brush is ideal. Use only water or ethyl alcohol to clean the trim and legend strips. Other solvents may cause damage to paint or plastic parts.

Avoid using the mixer close to strong sources of electromagnetic radiation (e.g. video monitors, high-power electric cabling): this may cause degradation of the audio quality due to induced voltages in connecting leads and chassis. For the same reason, always site the mixer power supply away from the mixer.

Caution! In all cases, refer servicing to qualified personnel.

Power supply & cables Always use a power supply and power cables specified for the mixer: the use of

alternative supplies may cause damage and voids the warranty; the extension of power cables may result in malfunction of the mixer.

Warning! Before switching on the power supply, check that the mains voltage selectors

are correctly set to the voltage for your area, and that the fuses are of the correct type and rating. This is marked on the case of the power supply. Do not replace the fuses with any other type, as this could become a safety hazard and will void the warranty.

PPS110 Power Supply

Warning! Always switch the power supplies off before connecting or disconnecting the

mixers power cables, removing or installing modules, and servicing. In the event of an electrical storm, or large mains voltage fluctuations, immediately switch off the PSU and isolate from the mains. The power supply is connected to the mixer via the 4-way socket, marked DC Power, on the rear panel.

Always ensure that you use a suitable power supply for the mixer. The GP1 may use a PPS110 power supply (see details of the power connection below), or a suitable external source.

The mixer is powered from an external power supply when the POWER switch on the rear panel is set to EXT.

A PPS110 power supply is supplied with all variants of the GP1. The power supply is capable of operating over a wide range of mains input voltages by means of a comprehensive set of selectable voltage settings. It is important to ensure that the correct voltage setting has been selected for the level of local AC mains input voltage supply, for safe, uninterrupted-operation of the units.

Warning! DO NOT CHANGE THE AC MAINS VOLTAGE SETTING WITHOUT

FIRST DISCONNECTING THE MAINS PLUG FROM THE MAINS SOCKET.

The power supply is provided with an IEC-type mains connector, coupled with a voltage selector with integral AC mains fuse holder. Confirm that the arrow moulded into the connector unit aligns with the voltage setting that is correct for your area. Voltage selection should be as follows:

· 100Volt setting for AC Mains Input 100-115Volts AC

· 120Volt setting for AC Mains Input 115-125Volts AC

· 220Volt setting for AC Mains Input 210-225Volts AC

Introduction 3

· 240Volt setting for AC Mains Input 230-264Volts AC

To change the selected voltage, prise off the fuse holder square top with a screwdriver-type tool, using the square blade tip in the slot. Pull the fuse carrier assembly clear of the body, rotate the fuse carrier body until the required input voltage lines up with the arrow, and then push the fuse carrier back into the connector body.

Warning! DO NOT USE DC MAINS INPUT VOLTAGES

Replacing Mains Fuse Switch the units on/off mains switch to the off position, remove the mains lead plug

from the mains supply socket.

Check the fuse and replace if necessary: also check that the voltage selector is correct for the mains supply level before switching the unit on again. The correct fuse ratings are as follows:

220/240 VAC fuse rating T1.0A/250V

100/120 VAC fuse rating T2.0A/250V

Warning! TO AVOID THE RISK OF FIRE REPLACE ONLY WITH THE CORRECT

VALUE AND TYPE OF FUSE AS INDICATED ON THE UNIT.

In the event of repeated failure of the mains fuse, consult the dealer from whom the unit was purchased.

Technical Specification Mains Input Voltages (Nominal): 240/220/120/100 VAC @50/60Hz

PPS110 XLR pin out:

Pin 1 Chassis

Pin 2 0V

Pin 3 Battery charging voltage (28V DC (nominal))

(for charging the internal batteries)

Pin 4 28V DC ( nominal)

Overall Dimensions (Chassis)

Height: 77mm

Width: 140mm

Depth: 172mm

Power Supply Installation Free Standing

The PPS110 is designed to operate as a free-standing unit without requiring any special cooling arrangement, but should not be accidentally or deliberately covered in any way.

Rack Mounting

The PPS110 can be provided with an optional 19-inch rack-mounting kit: it occupies 2U of rack space.

Batteries The Location Mixer may also be powered by its own internal batteries: 12 or 16 D

type cells are required: the 6 and 8-input variants use 12 cells, the 12-input variant uses 16 cells. These may be primary cells or rechargeable cells; all cells must be of

4 Introduction

the same type, do not mix types. The access panel for inserting and removing the cells is on the underside of the mixer.

Warning! DO NOT try to recharge dry (primary cells: they may explode, and the wiring

will melt if this is attempted

Rechargeable cells may be recharged from the power supply. To do this set the CHARGE switch on the power supply to on.

It is not advisable to charge the cells and use the mixer at the same time: performance specifications may not be achieved under adverse conditions.

The mixer is powered from the internal cells when the POWER switch on the rear panel is set to INT.

Signal Levels It is important to supply the correct input levels to the mixer, otherwise signal-to-

noise ratio or distortion performance may be degraded, and in extreme cases damage to the internal circuitry may result. Likewise, on all balanced inputs, avoid sources with large common mode DC, AC or RF voltages, as these will reduce the available signal range on the inputs. Note that 0dBu = 0.775V RMS.

The microphone inputs are designed for use with balanced, low impedance (150 or

200) microphones.

Caution! DO NOT use unbalanced microphones or battery powered condenser microphones

without isolating the phantom power - degraded performance or damage to the microphone may result.

Introduction 5

PPS110 Circuit Diagram

LD1

R3 2K4

CHARGE

SW1

SPST

CN2

F1A

2 P IN

AMBER

F3,16A

CHASSIS

CHARGE

2U2H

5 P IN

CHOKE

2K4

10000/40V

CN3

1N4001

LD2

GREEN

4 P IN XL R

CABLE CONNECT OR

RED

WHT

YEL

CHASSIS

CHARGE

GREEN

3 2

PPS-110

UNREGULATED POWER SUPPLY

ISSUE 2

ED3395

240V

10000/40V

2U2F/50V

3,15A

CN1

4 P IN

123

22R

100N

0.5W

100N

47R

RECT1

18V5 AC

TRANSFORMER

220V

120V

100V

DPST

SW2

MAINS VOLTAGE

50/60Hz

100V-240V

LNE

(I.E.C)

SELECTOR

120V

220V

100V

240V

FUSE

A.C.

The Mains input fuse is rated at:

T1.0A/250V Mains Input 220/240V AC

T2.0A/250V mains Input 100/120V AC

CHASSIS

6 Introduction

Connections

Wiring Conventions The GP1 uses two different types of audio connector: 3-pin XLR, and

jacks.

XLR Connectors

MALE XLR

Pin 1 = Ground (Screen) Pin 2 = Hot (In-Phase) Pin 3 = Cold ( Out-Of-Phase)

FEMALE XLR

Pin 1 = Ground (Screen) Pin 2 = Hot (In-Phase) Pin 3 = Cold ( Out-Of-Phase)

Jack Plugs

/4" 3-pole

Tip Ring Sleeve

The Connections are as follows:

Balanced Inputs

Tip Hot (In-Phase) Signal

Ring Cold (Out-Of-Phase) Signal

Sleeve Ground (Screen)

Headphones

Tip Left Signal

Ring Right Signal

Sleeve Ground (Screen)

Introduction 7

8 Introduction

+ 28 hidden pages