uher SG 631 Logic Operating Instructions Manual
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uher SG 631 Logic Operating Instructions Manual

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  • Page 2 The SG 631 LOGIC represents the utmost in tape recorder technology of today. As an aid to you in familiarizing yourself with its new techniques, we are supplying highly detailed oper- ating instructions and recommend that you read them carefully. If, however, you are already very familiar with the operation of modern tape machines, you will simply need to read certain sections.
  • Page 3 9. At the end of the Operating Instructions you will find a list of UHER accessory equipment available from your UHER dealer to supplement your recording system.
  • Page 4 Contents...
  • Page 6 1.2 Operating Position The SG 631 LOGIC is factory-set to an operating voltage of 220 V, but may be adjusted to operate on 115 V A.C. If necessary, set the The SG 631 LOGIC may be operated in either upright or horizontal voltage selector to the proper voltage.
  • Page 7 of 50 Hz or 60 Hz as the machine uses D.C. motors and the power supply unit is designed for operation with either frequency. Note: Extreme overloading of the power supply unit or internal short-circuiting activates an automatic guard circuit that switches off the power supply unit.
  • Page 8 1.6 Mounting UHER NAB Adapter Z 800 for 26.5 cm (10%") Reels and Loading Tape The NAB adapter must be carefully placed on the right and/or left hub spindle. First, pull up the three-pronged mandrel (A) of the spindle (see Fig.
  • Page 9 adapter, the empty reel on the right adapter. Once the reel is in place, Before placing a 26.5 cm (IOV2") reel on the NAB adapter, turn the turn the outer ring of the adapter clockwise until a clear stop is felt outer ring (D) of the adapter anti-clockwise until the three keys of the movable part of the ring are above those of the lower stationary part (see Fig.
  • Page 10 1.7 Record Operation for Users in a Hurry As the quality of the recording is essentially dependent upon the correct Press the zero reset button of the counter to mark the beginning of the recording. setting of the record level, this step should be given particular attention: Using the master control (5) , fade in the desired input sources Make certain that the input source to be used in recording is (see sec.
  • Page 11 1.8 Playback Operation for Users in a Hurry 4. Set a) tape type switch @ for tape used (see sec. 3.21), Playback may be directly through the machine's headphones power b) reel size switch @ (see sec. 3.24), stage (which permits connection of two stereo headphones) or through the loudspeakers of your hi-fi sound system.
  • Page 12 M 646 may be directly connected. Their earlier models M 640 on the market may be connected (output impedance 8 to 2,000 ohms). and M 645, on the other hand, require UHER Adapter K 822 for con- When listening to playback, the MONITOR switch ® should be in off- nection.
  • Page 13 To avoid loss of response in the high frequency range during record jector Lead K 911. Pins 2 and 3 are for slide changing by signalling the "Dia-Pilot" of the SG 631 LOGIC to scan the 1 kHz pulses recorded and playback, the connecting lead (K 541) should be extended only on the tape.
  • Page 14 680 kohms per channel). 2.9 ACCESSORY A This socket is for connecting a starting switch (see sec. 6.9) when operating with a timer. When using UHER Timer A 403, the SG 631 LOGIC 2.12 INPUT 1 (Jack) | i •...
  • Page 15 3. Operating Controls and Their Functions channels (respectively) of stereo input sources connected to the RADIO 3.1 Microphone Record Level Controls L 0 and R © or PHONO input sockets. When setting the record level, the master control (D should be pushed to the right all the way to the stop. The Knobs ©...
  • Page 16 3. Operating Controls and Their Functions channels (respectively) of stereo input sources connected to the RADIO 3.1 Microphone Record Level Controls L 0 and R © or PHONO input sockets. When setting the record level, the master control (D should be pushed to the right all the way to the stop. The Knobs ©...
  • Page 17 (Even the light exposure meters used in commercial sound studios are "much" slower than the illuminated Turning this switch sets the SG 631 LOGIC into MONO, STEREO or function indicators which operate inertialessly.) SLIDE operating mode. In quarter-track operation (using Tape Head...
  • Page 18 3% or 7V2 ips. 3.9 REC(ORD)Key © Pressing this key lightly sets the SG 631 LOGIC in record mode, and Fig. 4 setting the record level may be undertaken at once. Make certain that...
  • Page 19 3.10 Rewind Pressing this key lightly sets the machine for fast rewind. It may be Lightly pressing this key switches the SG 631 LOGIC to fast forward activated directly from any other operating function setting. When the wind. It may be actuated directly from any other deck function setting.
  • Page 20 (§) is set to DIA (to switch power supply of the SG 631 LOGIC. The level meter and the function on the control signal generator) and the RECORD key @ has been indicator above the STOP key will then light up, as well as one of the actuated.
  • Page 21 3.22 Stroboscope Discs 50 Hz @ and 60 Hz @ may be taken into consideration. With the fine control in "0" position, the 7 The 50 Hz stroboscope disc is incorporated into the tape tension sen- German DIN standard 45500. sor of the supply reel while the 60 Hz disc is on the sensor of the take-up reel.
  • Page 22 They will be easier to remember if they are always exe- one after the other once the tape has been threaded and wound onto cuted in the same order. the take-up reel past the switching foil (see sec. 1.6). The SG 631 LOGIC...
  • Page 23 Amplifiers with phone sockets may be connected to the RADIO socket justed with this control to approximately 1.5 V per channel) delivered of the SG 631 LOGIC via UHER Lead K 551. On the sound system to the headphones socket permits connecting self-energized loud- amplifier use the left and right tape inputs.
  • Page 24 DUBBING socket. UHER Stereo Lead K 541 should inaudible. On the other hand, if the quarter-track tape heads (Mount be used to connect the SG 631 LOGIC to the RADIO socket of the other Z 411) are used, sound for the slide showing may be stereophonic (see Fig.
  • Page 25 1. Switch the SG 631 LOGIC to STOP so that the tape may be lifted out change the slide automatically during subsequent playback. When all of of the threading slot.
  • Page 26 Once the timer has switched on the power supply of the input source of the playback head will usually be required only for half-track recor- and that of the SG 631 LOGIC, the start switch of the timer will switch dings and at tape speeds of 3% or 7...

  • Page 27: Care And Maintenance

    For this purpose, first pull the cover cap in front The housing of the SG 631 LOGIC should always be cleaned with a of the head mount up and off. The magnetic heads (D), (E), (F) and (G);...
  • Page 28 Performance Specifications Crosstalk (at 1 kHz in Quarter-track or half-track due to Stereo Operation): Better than 45 dB Track System: interchangeable tape head assemblies Crosstalk (at 1 kHz and Two-Direction Stereo Tape Speeds: 4-digit, with zero reset button and Counter: Operation): Better than 60 dB...
  • Page 31 UHER WERKE MUNCHEN 366-48210/DEF/lll/035/1179-R Printed in Germany...

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