Toa A-903A Operating Instructions Manual Download Page 10 | Manualshive

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Toa A-903A Operating Instructions Manual Download Page 10

TOA NEW 900 SERIES

Block Diagrams (Plug-in Modules)

H-01 Series

H-21S

H-31S

H-02 Series

H-22S

H-32S

H-03 Series

E-01 Series

E-11 Series

X-01 Series

X-11 Series

X-21S

B-01 Series

B-11 Series

L-01 Series

L-11S

L-41S

T-01 Series

S-01S

S-02S

S-03S

I-01S

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Summary of Contents for A-903A

Page 1: ...ormers for bridging high impedance lines the L 01 series Line Matching Transformers for matching 600 ohm lines I 01 Paging Input for combining with TOA Intercom Systems EXES 1000 EXES 5000 and EX 16 T...

Page 2: ...meter illuminates Adjust gain of INPUT 1 6 respectively Adjusts bass response Turn clockwise CW to boost and counterclockwise CCW to attenuate the bass response Tone is flat at center Adjusts treble r...

Page 3: ...connections for a booster amplifier or a tape recorder The input impedances of the equipment should be of more than 10k ohms When using this terminal set LINK SWITCH to OUT position Connects to a sign...

Page 4: ...y means of the connected potentiometer H 31 and H 32 modules incorporate muting functions If a switch is connected to MUTE TERMINAL on the rear panel of the ampli fier and closed these input signals c...

Page 5: ...ange Therefore in TRANS OUTPUT the acoustic effect and frequency response characteristics may be altered In TRANS OUTPUT cut off unnecessary low frequency to obtain the best acoustic condition When co...

Page 6: ...mode Output fuse Each amplifier has an output fuse to protect the amplifier from short circuiting at the output or overloading Check the fuse when speakers connected do not sound even if the meter de...

Page 7: ...77 dB Power amplifier only 105 dB Bass 10 dB at 100 Hz Treble 10 dB at 10 kHz Controls 6 Input gain controls 1 Bass tone control 1 Power ON OFF switch 1 Tone defeat switch 1 Master gain control 1 Tre...

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: ...B S N 70 dB S N 90 dB S N 80 dB S N 80 dB S N 80 dB S N 80 dB Signal Muting Level 60 dB 60 dB 60 dB 60 dB 60 dB 60 dB Remote volume control range use 10k ohms potentiometer 0 60 dB 0 60dB 0 60dB Contr...

Page 10: ...Diagrams Plug in Modules H 01 Series H 21S H 31S H 02 Series H 22S H 32S H 03 Series E 01 Series E 11 Series X 01 Series X 11 Series X 21S B 01 Series B 11 Series L 01 Series L 11S L 41S T 01 Series S...

Page 11: ...ol of module and the input volume control 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 MODUL...

Page 12: ...of R and T Lines R line Approx 9mA DC plus audio signals of 30dBm max T line Approx 9mA DC Rack mounting Brackets Silver Perforated Panel Silver A 906A A 912A P 906A P 912A P 924 M 900A A 903A HOW TO...

Page 13: ...Schematic A 903A 13...

Page 14: ...Schematic A 906A TOA NEW 900 SERIES 14...

Page 15: ...Schematic A 912A...

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