Recording and playback of the recorder Common faults of the recorder
One, the playback method of the recorder
1. Turn on the power and load the tape. Move the function switch to the “TAPE” position.
2. Press the playback button, the tape runs, and playback starts.
3. Adjust the volume control knob to obtain the desired volume.
4. Adjust the tone control knob to obtain the desired tone.
5. After the playback is completed, without rewinding the tape, press the stop/box button, and the tape will stop running. On pressing this key, the cassette compartment opens, remove the cassette, then close the cassette compartment and unplug the power cord. During playback, do not press the record button to avoid erasing the original recorded program content.
Second, the method of recording radio programs
1. Turn on the power and put the function switch of the recorder to the radio (RADIO) position.
2. Turn the band switch to the band to be recorded, adjust the frequency tuning knob, and find the frequency of the desired program.
3. Open the tape compartment, put in the tape, and press the reset button of the tape length counter to reset the number of the counter to “000” for counting.
4. When the program starts, press the record and play buttons at the same time to record. At this time, you can use the built-in speakers to monitor, the recording level has nothing to do with the volume, and adjusting the volume and tone knob will not affect the recording effect.
Three, microphone recording method
Microphone recording includes internal microphone recording, external microphone recording, and wireless microphone recording.
1. In-camera microphone recording:
① Turn on the power and install the tape. Move the function switch to the “TAPE” position.
② Throw the monitor switch to the disconnected position to avoid whistling due to feedback between the built-in microphone and the speaker. To monitor the recording quality, an external 8Ω headphone can be connected, and the monitor switch should be thrown to the ON position.
③ Use the built-in microphone to record, the loudness of the sound changes greatly, the automatic level control switch should be thrown in the ON position, then the volume control does not work, and the recording level is controlled by the automatic level The circuit is automatically adjusted. If the automatic level control switch is thrown in the off position, the automatic level control circuit does not work, and the recording level is adjusted by the volume control knob.
④ Press the reset button of the counter to reset the indication of the counter to “000”.
⑤ Press the pause button first, press the record and play buttons at the same time, and then press the pause button to record. Note that the sound source should be about 30 cm away from the built-in microphone.
⑥ After recording a tape, the tape recorder automatically stops working. Press the stop/cassette button, take out the tape, turn it over and put it in the cassette, close the cassette, and continue recording with the other side of the tape as described above. After recording an ideal program, in order to prevent it from being erased, you can dig out the small plastic cover (anti-miswipe cover) at the bottom of the cassette. In this way, the recording button cannot be pressed down, so as to avoid accidentally erasing the original recorded program. There are two anti-miswipe covers at the bottom of the cassette, which correspond to the A side and the B side of the tape respectively. If you need to re-record later, use tape to flatten the small cover you dug out.
⑦ At the end of recording, press the stop/exit button, take out the tape, and unplug the power.
2. External microphone recording
① Turn on the power and install the tape. Move the function switch to the “TAPE” position.
② Insert the microphone plug into the external microphone jack of the recorder (the input impedance of the microphone of the cassette recorder is generally several hundred to several thousand ohms, and a microphone with a similar output impedance should be used). Microphone recording.
In order to obtain a better recording effect, the following points should be paid attention to when recording with an external microphone:
a) Choose a suitable microphone according to the recording environment. When recording reports, dynamic microphones or crystal high-impedance microphones should be used; high-quality dynamic microphones should be used when recording literary and artistic programs; unidirectional microphones should be used for recording in auditoriums and conference rooms with loud noise and strong echoes. A microphone with higher sound sensitivity in a certain direction); if the sound comes from front and rear or left and right directions, a two-way microphone should be used; if the sound comes from all around, a non-directional microphone should be used.
b) Maintain a proper position between the sound source and the microphone. The distance between the microphone and the sound source is generally 10–30 cm. If the environment is noisy or the sound is weak, the microphone can be placed slightly closer to the sound source. However, if the microphone is placed too close to the sound source or placed close to the mouth, the clarity of the recording will be reduced or noises such as human breathing will be recorded. For solo singing with instrumental accompaniment, the microphone should be close to the soloist and away from the instrument to ensure volume balance. When recording collective literary and artistic programs such as chorus and recitation, each sound source should be placed within the effective range of the microphone to make the volume uniform. It is best to use multiple microphones, and then record through the mixer. When recording on a vibrating stage, the microphone should be suspended. If the sound source position moves a lot, the microphone should follow the microphone movement. The height of the microphone should be slightly lower than the sound source. Too high or too low will lead to a decrease in the clarity of the sound.
3. Use a wireless microphone to record, the method is basically the same as that of recording a radio program, but firstly you need to open it The power switch of the wireless microphone sets the band of the recorder to (FM) and speaks into the microphone. Adjust the frequency tuning knob until you hear the sound from the wireless microphone. Then the sound from the wireless microphone can be recorded according to the method of recording the broadcast program.
4. Tape duplication
1. Dual recording
①Acoustic transcription: refers to using one tape recorder to record another sound from a recorder. This will increase the distortion of the recording and the recorded ambient noise, which will affect the quality of the recording.
②Electrical transcription: Connect two tape recorders with tape transcription cables to transcribe electrical signals. If the recorder has a line input jack and the player has a line output jack, the best way to use line transcription is to use the line transcription method. Connection between the output to the external microphone input jack of the recorder.
Proper use of the pause key can avoid recording on the tape the interfering noise that occurs at the moment of power-on. The steps of using the pause button during recording are as follows: a. Press the pause button of the recorder first, and then press the record and play buttons at the same time. b. Find the beginning of the desired program, first press the pause button of the player, and then press the play button of the player. c. To start recording, first press the pause button of the audio player, and then press the pause button of the audio recorder. d. After recording, first press the pause button of the recorder, and then press the pause button of the player.
2. Dual-card recorder for duplication The dual-card recorder generally has the function of fast copying, which can be used for fast copying of the whole program, but the copying of the fragment program generally adopts the normal speed. The operation steps are as follows:
① Throw the function selection switch
② Throw the dubbing switch
③ Put the tape with the program in the playback stand and prepare to play.
④ Put a blank tape in the recorder to prepare for recording.
⑤ Throw the copy speed selector switch
⑥ Press the pause button of the sound box and the record box respectively, then press the sound button of the sound box and the sound button and the record button of the sound box, and then press the sound box and the sound box at the same time. Pause key to start copying. Some dual-card recorders have a copy button. Pressing this button can simultaneously complete the operation of pressing the playback and recording buttons of the recorder, and the playback button of the playback block, and the copying starts immediately.
⑦ Press the STOP/OUT key of the recorder and playback station simultaneously.
V. Common faults of the recorder
1. There is a “click” sound when turning the volume knob of the recorder
When the volume knob and tone knob of the recorder are turned up, an annoying “click, click” sound occurs in the speakers of the recorder. This is because: (1) The volume and tone potentiometers of the recorder are used for a long time, and the wear of the internal carbon film layer causes excessive accumulation of toner. (2) There is too much dust in the potentiometer. Repair method: For the former, remove the potentiometer and disassemble it, clean the carbon film layer with anhydrous alcohol or detergent, and then adjust the sliding position of the sliding piece or apply graphite glue to the damaged part of the carbon film layer, and it can be used after drying. The latter is washed with anhydrous alcohol or detergent, and can be restored by dripping a little sewing machine oil.
2. The AC power supply of the recorder is abnormal and the DC power supply is normal
The root cause of this failure of the recorder is in the power outlet. This is due to the fact that the recorder uses AC power, which weakens the flexibility of the AC outlet. Repair method: Use tweezers to pry up the spring piece to restore its original elasticity. If the spring plate is oxidized and rusted, use fine sandpaper to grind off the oxide and then clean it with alcohol to keep it in good contact, and it can return to normal.
3. The speed of the recorder is abnormal
In the case of normal power supply, if the speed of the recorder is abnormal, most of them are caused by the motor and governor of the recorder. (1) The brush in the motor is in poor contact with the commutator or the particles and dust falling off from the brush are accumulated in the gap of the commutator, causing the motor to not work normally. Repair method: Open the back cover of the recorder, remove the motor, disassemble the motor casing, use a brush to clean the falling particles and dust, and clean it with anhydrous alcohol, and then normal work can be resumed. (2) The motor governor is out of step. Adjust the adjustable element of the governor to return the speed to normal. Replace any damaged components.
4. The tape recorder makes a squealing screeching sound when it is in use
The tape recorder uses poor quality tape, and the magnetic powder on the tape is easy to fall off in the Between the guide pulley and the guide pulley shaft, a harsh scream is caused. Open the cassette compartment, use an alcohol cotton ball to clean the magnetic powder between the guide roller and the guide roller shaft, and then apply a little Vaseline to eliminate the squeal.
5. Recorder treble attenuation
The treble attenuation occurs when the recorder is playing. Except for the serious wear of the recording head, most cases are due to the The elasticity of the gasket is not good, so that the tape and the magnetic head cannot maintain good contact. Use needle-nosed pliers to clamp the concave spacers in the cassette to slightly protrude outwards to restore.
6. The recorder is disturbed by fluorescent lights
When the recorder is powered by AC power, if there is an AC hum in the speakers, it is caused by the interference of fluorescent lights. A piece of cigarette tin foil can be attached to the inner wall of the back cover of the recorder, and the tin foil can be connected to the grounding end of the recorder to eliminate interference.
7. The self-stop mechanism of the tape recorder fails
The tape recorder cannot be stopped automatically, generally due to the slippage caused by too much magnetic powder on the pinch pulley, which makes the pinch pulley The pressure at the capstan is reduced, resulting in insufficient tension at the end of the tape, causing the automatic shutdown to fail. Clean the magnetic powder on the pinch roller and capstan with an alcohol cotton ball. Adjust the tension spring of the pinch pulley and capstan.
8. Tape tape recorder
The tape reel of the tape recorder is driven by the rubber drive wheel, and the tape roll is caused by the slippage and friction of the rubber drive wheel. force reduction. Remove the rubber drive wheel, remove the rubber ring, and then wrap 2 to 4 laps of tape in the groove of the bracket to increase the friction of the rubber ring during transmission, and the fault can be eliminated. In some cases, the tape is of poor quality, and it is not a tape recorder problem.
9. Tape tape recorder
Tape tape recorder is a common fault, which can cause the tape to wrinkle in the lightest case and break the tape in the severe case. How to deal with the tape: (1) If there is not much tape, you can open the door of the recorder and slowly pull out the tape wrapped on the pinch roller or capstan. (2) When the tape is seriously tangled (that is, the tape compartment door cannot be opened), open the back cover of the recorder (you can see the motor and the flywheel at this time). Gently move the belt by hand to make the flywheel rotate, and the transmission direction is opposite to the playback direction. Wait until the tape wrapped around the capstan is loose and the door can be opened, and then take out the tape.
10. The tape recorder is not silencing cleanly
Reasons for unclean silencing: (1) The wear of the silencing head is serious, so that the head surface is concave, causing the head to contact the tape It is not tight, so it cannot play the role of silencing, and the silencing head needs to be replaced. (2) There is a lot of scale or magnetic powder sticking to the muffler head, which affects the muffler effect. Clean it with anhydrous alcohol. (3) Internal open circuit of the muffler head coil or poor contact of the terminals. If the coil is open, the magnetic head needs to be replaced, and if the contact is bad, it needs to be re-soldered. ⑷ When the position of the muting head changes and is not in the same horizontal position as the recording head, just adjust the head.
