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To mount the M-900A in a standard 19-inch equipment  rack, use

the MB-921  Rack-mounting  Bracket accessory.

Remove 4 screws securing case.

MB-921 (Silver)
( O P T I O N )

Fix the MB-921  with attached 4 screws.

The length of the screws should  not
exceed 12mm (1/2 inches).

Unpacking

Upon  receipt of the amplifier shipment, please  inspect for any

damage incurred in transit. If damage is found,  please notify your

local TOA representative and  the transportation company im-

mediately.
State  date, nature of damage, whether any damage was noticed on

the shipping container,  prior to  unpacking.  Please give waybill

number of shipping order.

 Failure

Should amplifier  fail,  contact  your  nearest TOA authorized  con-

tractor or service center.

Rack Mounting

Servicing

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Summary of Contents for M-9000

Page 1: ...or magnetic phono inputs the X 01 series and X 11 series Auxiliary Preamplifiers for high level sources the B 01 series and B 11 series Bridging Transformers for bridging high impedance lines the L 01...

Page 2: ...if the output level is 18dBm Usually set the switch to 4dBm position since the amplifier s rated output is 4dBm Place it in 18dBm position when more output is provided Item Name Function Description...

Page 3: ...and X 21 modules employing volume remote control functions connecting a potentiometer 10k ohms to the terminal of any of these modules permits the sound volume to be remotely controlled by means of t...

Page 4: ...NE QUALITY When adjusting tone quality place the TONE SWITCH in IN position thus activating the BASS and TREBLE CONTROLS Each control provides frequency response characteristics of flat in center boos...

Page 5: ...on receipt of the amplifier shipment please inspect for any damage incurred in transit If damage is found please notify your local TOA representative and the transportation company im mediately State...

Page 6: ...Block Diagram M 900 A 5...

Page 7: ...30 mW to 600 ohms 200 mW Aux Balanced 10k ohms 2 dBm Less than 1 5 dB no load to full load Master volume min 90 dB Master volume max 77 dB Bass 10dB at 100 Hz Treble 10dB at 10 kHz 6 Input gain contr...

Page 8: ...ith TOA INTERCOM SYSTEMS It accepts paging signals from the intercom station A group of special signal generating modules is also available for catching attention before announcement and testing withi...

Page 9: ...dB oct max attenuation MUTE DELAY CONTROL I 01S HIGH CUT FILTER CONTROL 4 2kHz 6dB oct max attenuation This provides flat characteristics at full CW position and attenuation in low frequency by turnin...

Page 10: ...Block Diagrams Plug in Modules 10...

Page 11: ...trol of the corresponding input so that an appropriate sound level may be obtained through the remote volume control T 01 SERIES BALANCED 600 ohm LINE OUTPUT MODULES This series of modules of rated ou...

Page 12: ...nd T Lines R line Approx 9mA DC plus audio signals of 30dBm max T line Approx 9mA DC Rack mounting Brackets Perforated Panel Silver Silver PF 911 MB 931A MB 921A A 912A A 903A P 906A P 912A P 924 HOW...

Page 13: ...Schemiatic M 900 A...

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