Troubleshooting Guide

Should any problem occur, conduct the following simple tests to determine whether or not servicing is required. If the problem persists after you have conducted these tests, consult the nearest

Sony Dictation Systems dealer.

The unit does not operate.

•The AC power adaptor is not plugged into a wall outlet.

•The POWER switch is set to STANDBY.

No sound from the built-in speaker

•The SPEAKER selector is set to HAND.

•The VOLUME control is set in the MIN position.

•An earphone is plugged in.

•The cassette is not inserted properly.

The tape speed is too fast or too slow.

•The TAPE SPEED selector is set incorrectly.

•The SPEED control is set incorrectly.

•The SPEED CONTROL switch is set to ON.

The tape stops in the rewind or fast forward mode and the alarm sounds.

•The AUTO STOP switch is activated and a tape with electronic index signal recorded is used.

•The entire tape has been wound.

Recording functions (Dict, Erase, Telephone recording, LTR, SEC) do not activate.

•The tape is completely rewound.

•The cassette tabs have been removed.

The hand control unit or the foot control unit does not operate.

•The plug is not connected to the CONTROL UNIT connector firmly.

•The BM-850 is operated with the tape operation buttons on the BM-850. Press STOP and proceed with the operation on the hand control unit or the foot control unit.

Sound drop-outs, loss of high frequency sounds, or excessive noise

• The heads are dirty. See “Maintenance”.

Erasing is unsatisfactory.

• The erase head is dirty. See “Maintenance”.

The LTR or SEC signal can not be recorded.

•The unit is in the Electronic “Index OFF” mode. (See page 15).

The LTR or SEC counter is not indicated.

•The unit is in the Electronic “Index OFF” mode. (See page 15).

The LTR or SEC counter does not work correctly.

The reverse time of the auto backspace function is not correct.

•A cassette which was not recorded using a Sony Professional Dictating Machine (BM-531, 560, 570, 577, 820, 880, 890 etc.) is played back in the Electronic “Index ON” mode. (See page 15.)

•The reverse time of the auto backspace function may become longer when the LTR or SEC signal is detected on the tape.

The switching time of the operation modes (STOP, LISTEN, FF or REW) is delayed.

•A cassette which was not recorded using a Sony Professional Dictating Machine (BM-531, 560, 570, 577, 820, 880, 890 etc.) is played back in the Electronic “Index ON” mode. (See page 15).

•When a button is pressed while detecting electronic index signal during playback.

Additional Information

BM-850D/T. 3-757-398-32. U. E

BM-850T, BM-850D specifications

The Sony BM-850D and BM-850T are powerful audio mixing consoles that stand out in the realm of professional sound engineering. Geared towards both live sound and studio environments, these models are designed to deliver exceptional audio performance, making them indispensable tools for sound professionals.

The BM-850D model is exceptional for its digital technology. It incorporates advanced digital signal processing (DSP), which provides pristine audio quality and allows for extensive customization of sound parameters. With its user-friendly interface, operators can quickly adjust levels, EQ, and effects to suit any performance context. The console features multiple input channels, enabling simultaneous use of various audio sources, which is ideal for complex audio setups.

One of the standout features of the BM-850D is its robust connectivity options. It supports a range of input types, including microphone, line, and auxiliary inputs, along with flexible output routing. This versatility allows sound engineers to switch quickly between different audio sources without compromising on quality.

The BM-850T, on the other hand, emphasizes portability and ease of use while still providing high-quality audio performance. This model is particularly suited for mobile applications, such as event production and on-the-road performances. Its compact design does not sacrifice functionality; it includes many of the same advanced features as the BM-850D, allowing for seamless integration into various setups.

Both models are equipped with advanced metering systems that provide visual feedback on audio levels, ensuring that engineers can maintain optimal mix balance. Additionally, they include built-in effects processors that offer a range of reverb, delay, and modulation effects, adding an extra layer of creativity to live performances or recordings.

The control layout of both models is intuitive, featuring clear labeling and easy access to critical functions. This design reduces the learning curve for users, allowing them to focus on delivering exceptional sound quality.

In conclusion, the Sony BM-850D and BM-850T are distinguished by their advanced technology and features, catering to the needs of sound professionals. Whether in a studio or on the go, these mixing consoles provide the reliability, flexibility, and audio fidelity that are essential in today's audio production landscape. With their combination of digital precision and user-friendly design, these models are set to enhance any audio mixing situation.

Sony BM-850D, BM-850T manual Troubleshooting Guide

Models: BM-850T BM-850D