Grass Valley 8910ADA-M User Manual

8910ADA-M/ST/SR

ANALOG AUDIO DISTRIBUTION AMPLIFIER

Instruction Manual

SOFTWARE VERSION 1.0.0

071815605
NOVEMBER 2008

Affiliate with the N.V. KEMA in The Netherlands

CERTIFICATE

Certificate Number: 510040.001

The Quality System of:

Grass Valley, Inc.

400 Providence Mine Road
Nevada City, CA 95945
United States

15655 SW Greystone Ct.
Beaverton, OR 97006
United States

10 Presidential Way
3

rd

Floor, Suite 300
Woburn, MA 01801
United States

Nederland B.V.
4800 RP BREDA
The Netherlands

Weiterstadt, Germany
Brunnenweg 9
D-64331 Weiterstadt
Germany

Rennes, France
Rue du Clos Courtel
Cesson-Sevigne, Cedex
France

Technopole Brest Iroise
CS 73808
29238 Brest Cedex 3
France

17 rue du Petit Albi-BP 8244
95801 Cergy Pontoise
Cergy, France

2300 South Decker Lake Blvd.
Salt Lake City, UT 84119
United States

7140 Baymeadows Way
Suite 101
Jacksonville, FL 32256
United States

Including its implementation, meets the requirements of the standard:

ISO 9001:2000

Scope:
The design, manufacture and support of video hardware and software products and
related systems.

This Certificate is valid until: June 14, 2009
This Certificate is valid as of: August 30, 2006
Certified for the first time: June 14, 2000

H. Pierre Sallé
President
KEMA-Registered Quality

The method of operation for quality certification is defined in the KEMA General Terms
And Conditions For Quality And Environmental Management Systems Certifications.
Integral publication of this certificate is allowed.

KEMA-Registered Quality, Inc.

4377 County Line Road
Chalfont, PA 18914
Ph: [phone]
Fax: [phone]

CRT 001 073004

ccredited By:

ANAB

A

8910ADA-M/ST/SR

ANALOG AUDIO DISTRIBUTION AMPLIFIER

Instruction Manual

SOFTWARE VERSION 1.0.0

071815605
NOVEMBER 2008

Contacting Grass Valley

International

Support Centers

Local Support

Centers

(available

during normal

business hours)

France

24 x 7

Australia and New Zealand: [phone] Central/South America: [phone]

Middle East: [phone] Near East and Africa: [phone] or [phone]

Europe

[phone] or [phone]
[phone] or [phone]

Hong Kong, Taiwan, Korea, Macau: [phone] Indian Subcontinent: [phone]

Asia

Southeast Asia/Malaysia: [phone] Southeast Asia/Singapore: [phone]
China: [phone] Japan: [phone]

Belarus, Russia, Tadzikistan, Ukraine, Uzbekistan: [phone] Switzerland: [phone]
S. Europe/Italy-Roma: [phone] -Milan: [phone] S. Europe/Spain: [phone]
Benelux/Belgium: [phone] Benelux/Netherlands: [phone] N. Europe: [phone]
Germany, Austria, Eastern Europe: [phone] UK, Ireland, Israel: [phone]

Copyright © Thomson. All rights reserved.
This product may be covered by one or more U.S. and foreign patents.

United States/Canada

24 x 7

[phone] or [phone]

Grass Valley Web Site

The www.thomsongrassvalley.com web site offers the following:

Online User Documentation — Current versions of product catalogs, brochures,

data sheets, ordering guides, planning guides, manuals, and release notes
in .pdf format can be downloaded.

FAQ Database — Solutions to problems and troubleshooting efforts can be

found by searching our Frequently Asked Questions (FAQ) database.

Software Downloads — Download software updates, drivers, and patches.

4 8910ADA-M/ST/SR — Instruction Manual

Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8910ADA-M, -ST, -SR Analog Audio Distribution Amplifier . . . . . . . . . . . 9

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Gecko 8900 Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Frame Capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

GeckoFlex Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Module Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Rear Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Front Module Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Hard-wired Potentiometers (8910ADA-SR Only). . . . . . . . . . . . . . . . . . . . . . . 16

Hard-wired Fine Gain/Balance Potentiometer Control . . . . . . . . . . . . . . . . . 18

Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Onboard 8910ADA-M and -ST Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Monaural or Stereo Mode (-ST Module Only). . . . . . . . . . . . . . . . . . . . . . . . . . 22

Output Gain Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Fine Gain Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Onboard 8910ADA-SR Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Local or Remote Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Output Mode Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Phase Inversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Gain and Balance Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Power Cycle and Control Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

8910ADA-M/ST Remote Configuration and Monitoring . . . . . . . . . . . . . . . . 27

8910ADA-SR Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . 27

8900NET Module Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Newton Control Panel Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Web Browser Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

8910ADA-SR Links and Web Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Status Web Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Audio Status/Controls Web Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Recall/Save User Settings Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Slot Config Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Software Updating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Equipment Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8910ADA-M/ST/SR — Instruction Manual 5

Contents

Acquiring Software Updates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Status Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Frame Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Web Browser Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

SNMP Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

8910ADA-M/-ST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Analog Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

8910ADA-SR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Inputs and Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Processor Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Analog Audio Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Input Level Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Hard-wired Fine Gain and Balance Potentiometers . . . . . . . . . . . . . . . . . . . . 53

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6 8910ADA-M/ST/SR — Instruction Manual

Preface

About This Manual

This manual describes the features of a specific 8900 module in the Gecko
and GeckoFlex Signal Processing System families. As part of this module
family, it is subject to Safety and Regulatory Compliance described in the
Gecko 8900 and GeckoFlex Series frame and power supply documentation.

See the Gecko 8900 Frame Instruction Manual and the GeckoFlex Frames
8900FX/FF/FFN Instruction Manual that can be found on-line in PDF format
at this link:

www.thomsongrassvalley.com/docs/modular

8910ADA-M/ST/SR — Instruction Manual 7

Preface

8 8910ADA-M/ST/SR — Instruction Manual

8910ADA-M, -ST, -SR Analog Audio Distribution Amplifier

Introduction

The 8910ADA modules are low cost, high-density analog audio distribu­tion amplifiers (DAs) available in eight output monaural (-M) or four
output stereo (-ST) versions, and four stereo remote (-SR). All versions are
designed for use in the 8900 Audio frames that provide input and output
miniature screw-down audio connectors or in the GeckoFlex frame using
an 8900A-R rear module. Each channel of the stereo has its own gain and
threshold controls.

The monaural DA has eight balanced outputs and the stereo DA has four
balanced outputs for each channel. Onboard jumpers on the -M and -ST
modules provide stepped gain control in 6 dB increments while a front
edge onboard potentiometer provides fine adjustment.

The -SR version is stereo with remote control ability using the web browser
or Newton Control Panel or it can be used in Local control mode using front
edge paddle switches for setting overall gain and balance and two
hard-wired gain and balance potentiometers for fine adjustment.

The 8910ADA features:

• Hot swappable modules,

• Overall gain adjustment using the front edge paddle switches (plus fine
gain and balance adjustment ± 6 dB with hard-wired pots on the -SR)

• Jumper selectable 6 dB gain steps from -12 dB to +30 dB on -M and -ST
modules,

• AC coupled audio path reducing DC offsets at output,

• Balanced low impedance outputs to drive bridging inputs,

• Maximum differential output level +24 dBu (12.28 V RMS) for -M and

-ST modules, and

• Maximum differential output level +28 dBu (19.47 V RMS) for

-SR modules.

8910ADA-M/ST/SR — Instruction Manual 9

Installation

Installation

Gecko 8900 Frame

The 8910ADA can be installed in either an 8900 Gecko or GeckoFlex frame.
An 8900A-R rear module is required for use in the GeckoFlex frame.

Installation of the 8910ADA module in an 8900 Gecko frame is a process of:

1. Setting local onboard jumper settings if using Local controls,

2. Placing the module in the proper frame slot, and

3. Cabling signal ports.

The 8910ADA module can be plugged in and removed from an 8900 Series
Audio frame with power on. When power is applied to the module, LED
indicators reflect the initialization process (see Power Up on page 19).

Frame Capacity

The maximum number of 8910ADA-M/ST modules can be installed in all
8900 Series Audio frames since the maximum power consumption and heat
generation is below frame cooling capacity. A maximum of six
8910ADA-SR modules can be used in a 30 Watt frame.
power capacity, cooling capacity, and maximum module count for each
frame type.

Table 1. Power, Cooling, and Module Capacity of 8900 Audio Frames

Power (W) 100 100 100

Recommended Module Cooling (W) 30 90 90

8910ADA-M Modules 10 10 10

8910ADA-ST Modules 10 10 10

8910ADA-SR Modules 6 10 10

Note Module capacity figures assume no other modules are in the frame.

Capacity Calculated

8900TX-A

Frame

(no fan)

8900TF-A

Frame

Tab le 1 provides the

8900TFN-A

Frame

10 8910ADA-M/ST/SR — Instruction Manual

Module Placement in the 8900 Frame

Frame Controller or

8900NET Module (only)

Power

Supplies

(only)

8156_04r1

8900 Audio Media Module

There are ten slot locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to

The two slots on the right are allocated for the power supplies. For addi­tional information concerning the Power Supply module, refer to the Gecko
8900 Frames Instruction Manual.

The third slot from the right is allocated for the controller module—either
a Frame Monitor Module or a 8900NET Network Interface Module. For
additional information concerning the controller module options, refer to
the 8900NET Network Interface Module Instruction Manual.

Figure 1. 8900 Series Audio Frame Slots

Installation

Figure 1.

8910ADA-M/ST/SR — Instruction Manual 11

Installation

8156_02

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

1

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

2

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

3

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

4

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

5

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

6

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

7

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

8

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

9

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN
10

8900 module slots are interchangeable within the frame. There are 10
three-terminal connectors and 4 BNC connectors in each slot’s I/O group.
The functional assignment of each connector in a group is determined by
the module that is placed in that slot. The maximum number of modules an
8900 frame can accept is ten.

Figure 2 illustrates the rear connector plate for

an 8900 Series Audio frame.

Figure 2. 8900 Series Audio Frame Rear Connectors

To install a module in Gecko frame:

1. If using local onboard controls, set jumpers on the module circuit

board. Refer to Onboard 8910ADA-M and -ST Configuration on page 22
or Onboard 8910ADA-SR Configuration on page 24 before installing the
front module.

2. Insert the module, connector end first, with the component side of the

module facing to the right and the ejector tab to the top.

3. Verify that the module connector seats properly against the backplane.

4. Press in the ejector tab to seat the module.

12 8910ADA-M/ST/SR — Instruction Manual

GeckoFlex Frame

Installation of the 8910ADA module in a GeckoFlex frame is a process of:

1. Installing the 8900A-R rear module into the rear of the frame,

1. Setting jumpers on the module circuit board if using local onboard

2. Placing the 8910ADA module in the corresponding front frame slot,

3. Cabling and terminating signal ports.

Module Installation Precautions

Please read and follow the precautions listed below before installing the
front and rear modules:

• Use standard anti-static procedures during installation. As modules

Installation

controls,

and

can be installed or removed when the GeckoFlex frame is powered up,
before removing the cover, please use an anti-static bracelet tied to a
metal part of the frame.

• Install the rear module first, then the front module, then the optical sub­module option (if used).

• When installing or removing a rear module, loosen or tighten the
screws holding the retainer clips to the frame manually with the
retainer clip tool provided inside the front cover of the frame (751­version frames only). For 650- version frames without the tool, use a
2 mm (5/64”) hex screwdriver. Please do not use an electric screw­driver.

• Make every effort to leave the screws holding the retainer clips in place
(do not remove them completely). They are very small and can easily
drop into other equipment causing a shorting hazard. (Two turns of the
screw should be enough to loosen the screws, 3 turns or more will
remove it.)

• When installing a rear module, tighten the screws on the retainer clips
just until snug. Do not apply more force than is necessary to seat the
rear module. Refer to the
retainer clip screw torque in Table 6 on p age 42.

Mechanical specification for the 8900A-R rear

8910ADA-M/ST/SR — Instruction Manual 13

Installation

Use needlenose pliers
to pull out blank after
removing retainers.

Rear Module Installation

To install a rear module into GeckoFlex frame, follow these steps:

Note Please read Module Installation Precautions on page 13 before installing the

rear module.

1. Each 8900A-R rear module or blank rear adapter cover is held in place

by two retainer clips as shown in Figure 3. Loosen (but do not remove
completely) the two screws holding each retainer clip to the frame with
a 2 mm (5/64”) hex screwdriver. Pull up on the retainer to remove it,
leaving the screws in place.

CAUTION Be careful to leave the screws in place as they can be easily lost or fall into

equipment below the frame creating a shorting hazard.

2. Remove the blank rear adapter cover by inserting needlenose pliers

into the slots in the top and bottom of the blank and pulling it off.

Note To remove a rear module already installed, follow the same steps. It is helpful

to first remove the front module so the rear can be pulled out more easily.

3. Insert the rear module into the empty slot.

4. Replace each retainer clip over the two screws on both sides of the

module and push down to seat the retainer.

5. Tighten the screws for each retainer clip just until they are snug. Do not

force or torque the screws too tightly. The rear retainer clip screw torque
specification is 4-5-inch-lb./0.45-0.60Nm.

Figure 3. Installing Rear Module

14 8910ADA-M/ST/SR — Instruction Manual

Front Module Installation

Slide top and bottom card carriers on module
over top and bottom guides on right of slot.

Module installed

Locking Pin

Front Module Side View

0642_10r0

After installing the rear module, install the front module as follows:

1. If using local onboard controls, set jumpers on the module circuit board

as required. Refer to Onboard 8910ADA-M and -ST Configuration on

page 22 or Onboard 8910ADA-SR Configuration on page 24 before

installing the front module.

2. Remove the front cover of the frame.

3. Locate the corresponding front slot.

4. Insert the front module so that the plastic card guides on the module

top and bottom edges go over the upper and lower raised rail guides on
the right of the top and bottom of the slot(Figure 4).

5. Carefully slide the module into the rear connector.

6. Lock the front module ejector tab into the locking pin.

7. Reinstall the front cover of the frame during normal operation.

Installation

Figure 4. Front Module Installation

8910ADA-M/ST/SR — Instruction Manual 15

Installation

Cabling

Cabling for the module in the Gecko frame is shown in Figure 5 on page 17.
For the GeckoFlex frame, refer to the 8900A-R rear module illustration in

Figure 6 on page 17.

Inputs

Unbalanced input loop-through input connectors, J13 or J14 are not used
for 8910ADA modules. A balanced input connects to connector J9 for the
8910ADA-M. The stereo 8910 ADA-ST accepts inputs from connectors J9
(Channel 1) and J10 (Channel 2).

Outputs

The 8910ADA-M has eight balanced outputs using connectors J1 through
J8. The 8910ADA-ST and SR have four balanced outputs per channel using
connectors J1, J3, J5, and J7 for Channel 1 and J2, J4, J6, and J8 for Channel 2.

Note The input mode to the Ch 1 and Ch 2 outputs can be chosen from Ch 1, Ch 2,

or the sum of both channels with local or remote controls.

8900-A-CBL Option

An audio breakout cable assembly consisting of four three-terminal to dual
BNCs can be purchased as an option for unbalanced outputs.

Hard-wired Potentiometers (8910ADA-SR Only)

For hard-wiring the fine Gain and Balance potentiometers to BNC J11 and
J12, refer to

Hard-wired Fine Gain/Balance Potentiometer Control on page 18.

16 8910ADA-M/ST/SR — Instruction Manual

Figure 5. 8910ADA Cabling in Gecko Frame

J2

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

1

J2

J1

J3

J5

J7

J9

J2

J4

J6

J8

J10

J11

J13

J12

J14

IN

1

+ -

G

8156_03

Eight Outputs

(J1-J8)

Stereo

Four Ch 1

Outputs

Four Ch 2
Outputs

Not Used

Used only on

-SR module
for remote

Gain control

Ch 1 Input

Used only on

-SR module
for remote
Balance control

Ch 2 Input

Monaural

Not Used

Not Used

Ch 1 Input

Not Used

Not Used

8900A-R

8900A-R

Eight Outputs

(J1-J8)

Monaural

Not Used

Not Used

Ch 1 Input

Not Used

Not Used

Pin 3
Pin 2
Pin 1

Pin 1
Pin 2
Pin 3

+
_

G

Pin 3
Pin 2
Pin 1

+
_

G

G
_

+

Pin 1
Pin 2
Pin 3

G
_

+

8156_14r0

Stereo

Four Ch 1

Outputs

(J1, J3, J5, J7)

Four Ch 2
Outputs
(J2, J4, J6, J8)

Not Used

Used only on

-SR module

for hard-wired

fine Gain control

Ch 1 Input

Used only on

-SR module
for hard-wired
fine Balance control

Ch 2 Input

Installation

8910ADA-M/ST/SR — Instruction Manual 17

Figure 6. 8910ADA Cabling in GeckoFlex Frame – 8900A-R Rear

Installation

Connect to J11 for
potentiometer fine gain adjust

Connect to J12 for
potentiometer fine balance adjust

10 k

CW*

* Clockwise rotation increases gain for gain pot and
increases gain for channel 2 while decreasing gain
for channel 1 for balance pot.

8156_10r1

Hard-wired Fine Gain/Balance Potentiometer Control

On the 8910ADA-SR module only, BNCs J11 and J12 can be connected to
external hard-wired customer-supplied potentiometers for fine (± 6 dB)
gain and balance adjustment respectively. Overall gain and balance (-12 dB
to +30 dB) are set with the front edge paddle switches as explained below.

Note The hardwired potentiometer controls are active only when the module is

jumpered for LOC/POT control. The Local/Remote position disables these
ports. Refer to Figure 11 on page 24.

When both local paddle switch adjustments and hard-wired potentiometer
adjustments are made, the following input gain relationships exist:

• Input 1 gain = hard-wired potentiometer gain + paddle switch gain ­paddle switch balance - hard-wired potentiometer balance

• Input 2 gain = hard-wired potentiometer gain + paddle switch gain +
paddle switch balance + hard-wired potentiometer balance

These relationships will be reported on the Audio Status/Control web page
in read-only mode similar to the one shown in Figure 16 on page 33. When
the gain or balance is changed using a paddle switch or one of the potenti­ometers, the web page will update when the user manually refreshes it.

Figure 7 provides a schematic diagram for constructing a user-supplied

hard-wired control circuit to connect to these BNCs.

Figure 7. User-supplied Hard-wired Fine Gain and Balance Control Circuits

18 8910ADA-M/ST/SR — Instruction Manual