Uher SG 631 Logic User Manual [de]

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. Each chapter forms a closed unit and refers, only when absolutely necessary, to

other parts of the manual, that, in turn, may be located easily by using the table of contents.

For

full utilization of the new technologies offered by the SG 631, the points

below should

Use UHER NAB Adapter Z 800 to avoid even the slightest play between reel and hub

shaft (see sec.

2. Use UHER "professional" metal reels (Z 827) as they guarantee smooth movement for all tape transport functions and decrease tape wear (see sec.

3. UHER "professional" tape Z 830 is recommended for optimum operational results and best electro-acoustical values (see sec. 6.10).

4. Always use reels of the same size and of the same material together (see sec.

5. Make certain that the CUEING switch is set to "0" for all modes of operation except CUEING to avoid tape spilling (see sec. 3.18).

6. Make certain that the reel size switch is set to the appropritate position (see sec. 3.24).

7. Read Chapter 7 "Care and Maintenance" with especial care.

8. When the SG 631 is operating in the it from horizontal to vertical operating position nor touch the reels under any condition.

followed carefully:

1.6).

fast-wind

6.10).

mode, for safety reasons neither move

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.

Contents

1. Setting up the SG 631 LOGIC for Record Playback

Operation

1.1 Air Circulation

The greatest amount of heat develops around the power transformer which is located at the center of the ventilating slits. The ventilating slits must be left free regardless of the machine's operating position. When installing the machine in a cabinet, a closed section of wall shelves, etc., be certain to allow for sufficient air circulation to assure proper heat exchange.

1.2 Operating Position

The SG 631 LOGIC may be operated in either upright or horizontal

position, or if desired, in any tilted position. In all operating positions, however, care must be taken that the spools are securely held onto the hub spindles as described in sec. 1.6 below.

1.3 Extending Connecting Leads

When matching UHER plug-in extension leads are not used, connecting leads should be extended only by an experienced service technician (see also

sees.

2.3, 2.4 and 2.5).

, " '-

1.4 A.C. Mains Connection, Operating Voltage, Frequency, Mains Fuse

The mains lead is attached to the machine and is located in the covered recess in the floor (or rear) of the housing (see Fig. 1). Before plugging the lead into a mains power outlet, ascertain the voltage of the power supply.

The SG 631 LOGIC is factory-set to an operating voltage of 220 V, but may be adjusted to operate on voltage selector to the proper voltage.

Before adjusting the voltage, make certain that no leads are connected to a mains power outlet and that the mains fuse, located in the fuse holder "A" (Fig. 1) corresponds with the voltage to be selected. With the aid of a coin, unscrew the fuse holder. Use a 220 V A.C., and a 1.6 A fuse for inserted, the operating voltage may be chosen by turning the voltage selector "B" (Fig. 1) with a coin. The voltage value selected will appear in the recess "C" (Fig. 1) of the voltage selector.

115

V A.C. If necessary, set the

0.8

A fuse for

115

V. Once the proper fuse has been

Fig. 1

is not necessary to adjust the SG 631 LOGIC to a mains frequency of 50 Hz or 60 Hz as the machine uses 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. Disengaging then re-engaging the POWER push-button returns the guard circuit to its "alert" function. Fuses for the D.C. voltages in the machine may also burn out when the guard circuit is activated. Such fuses should be replaced only by a service technician as the cause of the blow-out must be detected and, if necessary, removed.

1.5 Mounting Feet for Upright Operation

For upright operation, two feet "D" are provided with each machine (see Fig. 1). To mount them, first lay the machine on one side. Turn

fixing screws "E" a few times into the threadings "F". Next push notches

"G" in the feet "D" under the head of the fixing screws "E" until the bridge catches in groove "I". Then tighten fixing screws "E".

D.C.

motors and the power

1.6 Mounting UHER NAB Adapter Z 800 for 26.5 cm 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. 2) and turn it until the prongs of the movable section rest on those of the stationary section. The inner ring (B) of the NAB adapter must also be turned to the left until the clamping jaws (C) for the threepronged mandrel (A) are opened so wide that the adapter may be easily set upon the spindle. Once the adapter has been set in place (see Fig. 3), the three-pronged mandrel (A) should be turned to the right or to the

left until it jumps down into the grooves of the stationary setion. The adapter is then prevented from falling off. The inner ring (B) of the

clamping

adapter is tightly secured to the three-pronged mandrel. Tightening the

clamping jaws is of particular importance as it will prevent any play between the mandrel and the NAB adapter.

NAB adapters without clamping jaws cannot do away with the play between mandrel and adapter. If the play is too great, however, poor speed stability and poor tape wind may result. (Mounting such NAB adapters and securing them against falling off is best accomplished as described for UHER NAB adapters.)

jaws should then be turned to the right, closing it until the

(10%")

Fig. 2

Before placing a 26.5 cm

(IOV2")

reel on the NAB adapter, turn the 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. 2). The full reel of tape should be placed on the left NAB

Fig. 3

adapter, the empty reel on the right adapter. Once the reel is in place, turn the outer ring of the adapter clockwise until a clear stop is felt (see Fig. 3).

To thread the tape, run a tape lead of about 50 cm (20") from the left-

hand (supply) reel - without slack - past the tape tension sensor into

the threading slot between the front tape-head cover and the tape-

head assembly, out past the right tension sensor onto the right (takeup) reel and turn the take-up reel until the supply reel is turned along with it. On pressing the power switch and actuating the START or FAST FORWARD key, the tape lead will wind onto the take-up reel until the transparent or metal-coated switching foil appears. The foil activates an automatic shut-off switch for all deck functions. The foil-activated switch may be disengaged by pressing the counter reset button; hence, with the reset button down, lightly touching the START or FAST

FORWARD key will begin tape transport again. The zero reset button © must be held down until the switching foil has cleared the tape head assembly.

Note: Tapes which have been played or recorded on other tape machines must be inspected to make certain that they are tightly wound onto the reel.

necessary, unwind and rewind the tapes on your SG 631 before

using them to record or replay.

To facilitate loading tape when small sized reels (under 18 cm) are used, first press the PAUSE @ and CUEING @ keys; then deactivate them

after loading tape on it.

1.7 Record Operation for Users in a Hurry

*•'

As the quality of the recording is essentially dependent upon the correct setting of the record level, this step should be given particular attention:

1. Make certain that the input source to be used in recording is connected and switched on.

3. Load tape and wind past switching foil onto take-up spool (see

1.6

and 3.15).

sees.

4. Set a) tape type switch @ for tape used (see sec. 3.21), b) reel size switch @ (see sec. 3.24),

c) mode selector switch (8) to desired record mode (see sec. 3.6) and d) tape speed selector ® (see sec.

3.8).

5. Touching them lightly, one after another, actuate the RECORD®,

PAUSE @ and START

(J3)

keys. The function indicators above the

keys will light up.

6. Press the zero reset button of the counter to mark the beginning of the recording.

7. Using the master control (5) , fade in the desired input sources (see sec. 3.3).

sees.

3.1 and 3.2).

10. Tip PAUSE key© once more. Tape transport and recording will begin. Tipping the PAUSE key still again will interrupt tape motion and recording.

11.

Connect stereo headphones (see sec. 2.2) and adjust their volume,

using headphone volume control @ . Check recording acoustically (as described in sec. 3.7) by pressing the MONITOR switch (9)

12.

13.

+ 22 hidden pages