Operating Instructions REVOX C270 · Tape Recorder
For the sake of clarity and ease of use, these operating instructions have been subdivided into the following five Sections: SECTION 1 Installation and first time operation Contains all information required for correct installation and connection of the tape recorder. SECTION 2 Operation Provides basic information concerning the operation of the tape recorder such as PLAY and RECORD mode. SECTION 3 Extended Operation Explains all auxiliary and special functions that are not described in Section 2 such as LOCATOR, waste basket mode, and editing. SECTION 4 Technical appendix
Contains interesting information on the design of reel-to-reel tape recorders, hints on level standards, as well as for converting the unit. The technical data and dimensions are also included in this Section.
SECTION 5
List of keypad functions
Contains quick-reference instructions for the experienced user and provides a quick overview of all keypad functions.
Indexed synoptical drawing
At the end of this manual you will find a foldout page with a synoptical drawing on which index numbers have been provided. The index numbers which in the text appear between brackets correspond to those on the drawing.
1
Protect your tape recorder from exposure to excessive heat and moisture. Install it in a position where the ventilation louvers are not obstructed.
WARRANTY
A special warranty request card is included with all equipment sold within the Federal Republic of Germany. This card is located either inside the packing or in a plastic pouch attached to the outside of the packing. Should this card be missing, please consult your REVOX dealer or your national REVOX distributor. Warranty cards for equipment sold in Switzerland or Austria are
issued directly by the authorized dealer. Please note that the warranty is only valid within the country in which the equipment has been sold. The warranty becomes null and void if unauthorized modifications or unprofessional repairs are made.
PACKING MATERIAL
Please retain the original box for reuse in case your equipment ever needs to be transported. The packing material has been especially designed to protect your valuable equipment from mechanical shock in transit.
Contents
SECTION 1
| Installation | Items included with the recorder | 4 |
|---|---|---|
| and first operation | Setup | 4 |
| Connecting the signal sources | 5 | |
| Switching on the tape recorder | 6 |
SECTION 2
Operation
| Inserting the tape | / |
|---|---|
| Tape speed (SLOW/FAST) | 8 |
| Tape transport functions | 9 |
| PLAY mode | 10 |
| RECORD mode | 11 |
| Monitor speaker | 13 |
|
Tape speed (SLOW/FAST)
Tape transport functions PLAY mode RECORD mode Monitor speaker |
SECTION 3
| Extended operation | Variable tape speed | |
|---|---|---|
| Locator function | 16 | |
| LOOP mode | ||
| Waste basket mode (T–DUMP) | 20 | |
| Editing function (EDIT) | 21 | |
| Tape scissors | 22 | |
| Reproduce delay | 24 | |
| Automatic recording | 25 |
SECTION 4
| Technical appendix | Track configuration on the tape | 27 |
|---|---|---|
| Care and maintenance instructions | 29 | |
| Equalizations (IEC, NAB) | 30 | |
| Alternate tape speeds | 31 | |
| Calibration (standard level) | 33 | |
| Technical data | 35 | |
| Dimensions | 36 |
SECTION 5
| Quick-reference description | S Index of keypad functions | |
|---|---|---|
| Correct insertion of the tape | 43 | |
| Indexed synoptical diagram | 44 | |
| Audio block diagram | 45 |
SECTION 1
Installation
Items included with the recorder, Setup
Items included with the recorder
10 mm
____
In addition to these operating instructions and the tape recorder, the packing also contains a power cord fitted with a plug that conforms to the standards of your country, as well as 3 plugs and a set of 7 fuses for MONITOR, FADER START, RS232, plus a set of diagrams. Please consult your dealer if any of the above items is missing or incorrect.
These operating instructions are also available in the following languages:
DEUTSCH: Bestellnummer: 10.30.0780 FRANÇAIS: No. comm.: 10.30.0790
Install your recorder in a position where the ventilation louvers are not obstructed. A ventilation clearance of at least 10 mm (½") should be maintained to other equipment, walls and furnishings.
Setup
4
Important safety instructions
Connect the recorder to an AC outlet using the included power cable.
Always keep the equipment in dry condition. It is extremely hazardous to operate it in wet rooms (bathroom, laundry room, basement, etc.).
The recorder is designed to be operated in any position between horizontal and vertical. In case of a malfunction or a defect, immediately disconnect the power plug and have the tape recorder inspected by an authorized REVOX dealer.
Installation
Setup
When you press the POWER [1] key on the front panel, the tape recorder switches on. Press the same key again and it switches off. When you switch on the tape recorder, the VU-meters are illuminated and the last active VU-meters are illuminated and the last active system parameters (tape speed, tape add-ress) are shown on the real-time tape counter [7], and the output selectors (INPUT, SYNC, READY) are restored to their previous posi-tion. The last active settings are stored again when the unit is switched off. The tape recorder cannot be switched on or off by means of the remote control
off by means of the remote control.
After the tape recorder has been switched on, the Real Time counter [7] displays the chosen tape speed "ips" for approx. 2 seconds. Subsequently, the actual tape position is shown.
SECTION 2
Operation
Inserting the tape
Three-pronged reel (DIN)
AEG platter (for self-supporting pancakes)
Mount the full reel on the left-hand spindle [2] and the empty reel on the right-hand spindle [3]. To lock the reel, pull out the three-pronged guide and rotate it by 60°.
Mount the NAB adapters on the spindles [2/3]. To lock the adapter, pull out the threepronged guide and rotate it by 60°. Mount the full NAB tape reel on the left-hand NAB adapter and the empty NAB reel on the right-hand NAB adapter. To secure the reels, turn the upper part of the adapter clockwise until it engages.
Mount the adapter platters on the spindles [2/3]. To lock the adapter, pull out the threepronged guide and rotate it by 60°. Mount the tape pancake on the left-hand platter and an empty hub on the right-hand platter. To secure the hubs, lift the adapter clip and rotate it by 90° so that they rest on the two guide pins.
Thread the tape as shown in the opposite diagram. It must be smoothly guided around the tape tension sensor [6], the tacho roller [4], and the right-hand guide pin. Thread the beginning of the tape around the right-hand reel and secure the tape by giving the reel a few counterclockwise turns.
If the tape starts with a transparent leader, spool the tape forward by pressing the >> key [19] so that the oxide coating covers the light barrier [5]. Then press the RESET [8] key to set the tape counter [7] to zero. If the tape counter is always set to zero at the same tape position, the tape can be positioned at any address with split-second accuracy by means of the realtime counter [7].
A detailed description of the correct way to thread the tape is given on page 43 of these operating instructions.
Operation
Tape speed (SLOW/FAST)
The REVOX C270 tape recorder can be operated with any two of three speeds. Depending on the configuration of your unit, one of the following speed pairs is available:
|
n: FAST
/s /s |
|---|
With the SLOW [40] key, the slower speed is selected, with the FAST [41] key the higher speed is selected. The corresponding LED above the key lights up. The selected tape speed is always displayed on the real-time counter [7] for a few seconds. The speeds are not indicated in cm/s but in ips (inches per second):
| 3.75 ips | - | 9.5 cm/s |
|---|---|---|
| 7.5 ips | - | 19cm/s |
| 15 ips | - | 38 cm/s |
Operation
Tape transport functions
The REC [22] key is pressed together with the PLAY [20] key in order to activate the record mode. Recording is now possible on channels that have been activated with the READY [24/33] keys.
Any of the foregoing keys can be pressed in any operating state of the recorder. The builtin microprocessor automatically checks the validity of the command and protects the tape by first decelerating it before a different sense of rotation or speed is activated.
Note:
PLAY mode
The following steps are necessary for reproducing the recording on a tape:
- Insert the tape.
- Set the output selector of both channels to REPRO [27/36].
• Press the PLAY [20] key. The play mode is activated and the recording can be heard via a connected amplifier or the built-in monitor speaker (pull VOLUME [46] knob). The level available at LINE OUTPUT CH1 and LINE OUTPUT CH2 can be varied with the OUT-PUT [38] level potentiometer, provided uncalibrated output level has been selected with the UNCAL [39] key. Each channel can be adjusted individually by turning the two concentric knobs. The inner knob influences the level of channel 1, the outer knob influences channel 2.
The monitor speaker volume can also be adiusted with the VOLUME [46] potentiometer.
Operation
Record mode
For making a recording, the LINE INPUT CH1 and LINE INPUT CH2 must be connected to a signal source (amplifier, tape recorder, mixing console) or, on models with built-in microphone amplifier (Option: MIC/LINE SWITCH BOARD 1.777.520.00), the microphones should be connected to the MIC INPUT CH1 and MIC INPUT CH2.
Mount the tape
• Set the input selector to LINE [31], or to MIC [29] if the recording is made via the microphones.
READY NAVE SING REPRO
• Set the output selectors of both channels, or of the channel to be used for recording, to INPUT [25/34].
• The VU-meters [23/32] indicate the level of the input signal. If the level is too low or too high, press the UNCAL [30] to switch to uncalibrated operation (always automatically activated in MIC mode), and adjust the input level by means of the level potentiometers INPUT CH1 [28] and INPUT CH2 [37].
STOP
ÞÞ
• Start the recording operation by simultaneously pressing the REC [22] and PLAY [20] keys. The red LED above the READY keys is continuously light.
Operation
Monitor speaker
With the aid of the built-in monitor speaker it is possible to listen to previously made recordings without any amplifier, or to monitor the recordings while they are being made.
• The monitor speaker is activated by pulling up the VOLUME [46] knob, and its volume can be adjusted by turning the knob. To switch off the speaker simply push in the button.
• The monitor speaker is automatically switched off when the headphones are plugged into the connector [45].
• An additional monitor amplifier with speakers can be connected to the MONITOR socket. This amplifier is not switched off when headphones are plugged in.
• The reproduction mode can be defined with the SELECTOR [44] switch. In the STE-REO position, both channels (monophonic) can be heard over the built-in monitor speaker. The stereophonic signal can be heard via the headphones socket or the MONITOR socket.
socket. In the position CH1 or CH2, only channel 1 or 2 is reproduced. On the headphones and the MONITOR socket, the selected channel can be heard on the left-hand or right-hand channel respectively.
he respectively. In the MONO position both channels are added and reproduced as monophonic signal.
The SELECTOR [44] switch influences only the reproduction via the MONITOR speaker or the PHONES [45] socket. It has no effect on the LINE OUTPUT CH1 and LINE OUTPUT CH2.
Note:
SECTION 3
Extended operation
Variable tape speed
In reproduce as well as record mode, the tape speed can be varied by pressing the VARI-ABLE [42] key; the yellow LED above this key lights up.
The deviation of the tape speed from the se-lected nominal speed (SLOW/FAST) can be varied within the range of – 33 % to + 50 %.
The tape speed can also be varied externally via the FADER/SYNC socket by means of a TTL signal (0V/+5V) within the range of -33% to +50%. The nominal speed is achieved with a control frequency of 9.6 kHz. Pin 1 of the connector is to be connected to GND (0V) and the TTL signal to pin 4.
-Square wave fnom = 9,6 kHz
Locator function
Z-LOC [13]
Image: state of the state o
When you press the STOP [21] key or one of the spooling keys << [18] or >> [19], the search is cancelled and the selected function is executed.
When you press the Z-LOC [13] key, the tape positions at the counter address 00.00.00; the yellow LED above the key lights up. The Z-LOC function can be activated in any mode except in record and T-DUMP mode.
While the tape is being positioned, you can preselect play mode by pressing the PLAY [20] key. This is acknowledged by the flashing LED above the Z-LOC [13] key. As soon as the tape address 00.00.00 is reached, the recorder switches automatically to play mode.
16
Locator function
A-LOC [14]
The A-LOC [14] key puts a user-programmable address locator at your disposal. When you press this key, the tape is positioned at the counter address stored in the address locator.
By pressing the TRANS [10] key, you can transfer the momentary address of the real-time counter into the A–LOC for use in subsequent search functions.
Proceed as follows for searching a specific tape location or to transfer it into the A-LOC:
Press the SEL [8] key: the address stored in the A-LOC is displayed, the first digit of the display flashes.
• The displayed value can be modified by pressing the STEP [9] key repetitively. Continue pressing this key until the desired address is displayed.
• Press the SEL [8] key again: the second digit of the display flashes and can be modified with the STEP [9] key. The complete tape address can be entered by repetitive pressing of the SEL [8] key and the STEP [9].
• The content of the A-LOC display can be transferred into the memory by pressing the TRANS [10] key. The display then changes back to indicating the current tape location.
• When you press the A-LOC [14] key, the tape is automatically positioned at the programmed address.
Instead of pressing the TRANS [10] key you can also press the SEARCH [11] key. In this case the content of the display is not transferred into the A-LOC, however, the tape will be positioned at the specified address.
The positioning operation is cancelled when the STOP [21] key or one of the spooling keys <<[18] or >> [19] is pressed, and the selected function is immediately executed.
Z-LOC A-LOC LOOP T-DUMP EDIT
While the tape is being positioned, you can preselect the play mode by pressing the PLAY [20] key. This is acknowledged by the flashing yellow LED above the A-LOC [14] key. Play mode is automatically activated when the tape address 12.24.35 is reached.
LOOP mode
In LOOP mode it is possible to automatically repeat the playback of a certain tape segment or the entire tape. Proceed as follows:
• At the position where the loop is to start, set the tape counter to zero by pressing the RE-SET [12] key.
• Enter the ending address of the loop into the A-LOC as described under "Locator function"
Press the LOOP [15] key. The yellow LED above this key lights up; the recorder positions at the tape address 12.24.35 and starts in play mode. When the ending loop address stored in the A-LOC is reached, the tape rewinds automatically and the entire process is repeated until cancelled.
The LOOP function can be cancelled by selecting a tape transport function (<<, >>, PLAY, STOP) or by pressing the Z-LOC or A-LOC key. The selected function will be executed immediately.
If the tape address stored in the A–LOC is negative, the play mode starts at the address stored in the A–LOC and ends at tape address 00.00.00.
Note:
19
Waste basket mode (T-DUMP)
T-DUMP [16]
RESET
• When you press the PLAY [20] key, the tape is played but not wound. The tape section that is played into the waste basket can still be heard.
The T-DUMP [16] key activates the "waste
basket" mode; the yellow LED above this key lights up. In this mode the right-hand spooling motor is switched off and unusable tape sec-
• Press the STOP [21] key. The play mode is interrupted and the tape stops.
Z-LOC A-LOC LOOP T-DUMP EDIT
• In order to retighten the loose tape, continuously press one of the spooling keys << [18] or >> [19] or PLAY [20]: the right-hand spindle [3] rotates slowly until the tape is again tensioned.
Editing function (EDIT)
EDIT [17]
The EDIT [17] key activates the edit mode in which the tape can be accurately positioned by manually rotating the right-hand spindle [3]. The audio path is active in this mode which means that the recording is audible while the tape is being positioned.
• Press the EDIT [17] key. If the recorder is not in play or record mode, the edit mode is active and the yellow LED above this key lights
Position the tape by turning the right-hand spindle [3] by hand. The tape tension func-tions correctly only if the right-hand spindle is
• In edit mode, positioning is also possible with the aid of the spooling motors by pres-sing the << [18] or >> [19] key. In this case the tape is transported at reduced speed and not lifted off the soundhead, i. e. the recording can be heard.
To extend the life of the tape and the soundheads, long tape sections should not be spooled in edit mode.
Tape scissors
The tape can be cut quickly and neatly with the aid of the built-in antimagnetic tape scissors [48].
• In edit mode (EDIT [17] key pressed), position the tape exactly at the edit point.
• Press the STOP [21] key in order to switch off the spooling motors.
• Hold the tape between the index finger and thumb of your right hand at the mark [49] on the headblock housing.
• Insert the tape into the splicing block of the scissors [48] in such a way that the index finger of your right hand is flush with the righthand panel of the housing. The tape position which was previously located under the reproduce head gap is now exactly under the scissors.
Reproduce delay
The play start of the C270 tape recorder can be delayed by fractions of a second in order to prevent reproduction of pitch variations caused by the acceleration of the capstan mo-
tor. This delay can be user-defined and entered individually for each tape speed within the range of 0.00 s to 0.99 s.
• Enter programming mode by depressing speed selector [40-41] and SEL [8] button. The display [7] shows the selected tape speed in "ips" (inches per second), and in the SEC position the current reproduce delay in "ms" x10 (milliseconds x10). The first digit of the display flashes.
Z-LOC A-LOC LOOP T-DUMP EDIT
• The value of the flashing digit can be changed by pressing the STEP [9] key. Press the SEL [8] key again: the second digit of the delay time flashes and can be modified with the STEP [9] key.
Press the TRANS [10] key: the stored reproduce delay is saved and activated. Repeat the same procedure for the second tape speed.
You can cancel the input procedure at any time by pressing the STOP [21] key. The displayed value multiplied by a factor of 10 gives the delay time in "ms" (milliseconds).
Note:
Automatic recording
It is possible to automatically start a recording at the preset time by means of an external time
Switch. Connect the tape recorder to the AC outlet via a commercially available time switch and proceed follows:
• With the spooling keys, position the tape at the location where the recording should start.
• Prepare the recording by selecting the signal source (LINE [31] or MIC [29]) and in uncalibrated mode by adjusting the recording level with the level potentiometers INPUT CH1/ CH2 [28/37].
Z-LOC A-LOC LOOP T-DUMP EDIT
Press the REC [22] key and simultaneously the SEL [8] key. The characters "AU" appear on the display [7].
• Switch off the tape recorder. When the recorder is switched on again, the record mode is automatically activated. If neither of the two channels has been switched to READY [24/33] during the preparations, recording will take place on both channels. If only one of the channels has been switched to READY, only this one channel will record.
The automatic recording mode is activated only once and cancelled after it has been executed.
Note:
Track configuration on the tape
2 -
The REVOX C270 tape recorder is available in
- Stereo nan-track (standard unit with 2 mm track separation) Stereo half-track RF (broadcast version with 0.75 mm track
- separation) Stereo quarter-track Mono full track
Only one type of recording can be made with each of the above versions. With a half-track machine, for example, stereo recordings can be made only in one tape direction.
Stereo half-track refers to track configurations in which each stereo track occupies one half of the tape. When a stereophonic signal sourof the tape, when a stereophonic signal sour-ce is recorded (e.g. music from a stereo turn-table), both tracks are always recorded con-currently. The left-hand channel (CH1) is recurrently. The left-hand channel (CH1) is re-corded on the upper track, the right-hand channel (CH2) on the lower track. If mono recordings are made on such a unit, the signal should always be recorded simulta-
The abbreviation RF designates the broadcast version of the stereo half-track machine. The is principally intended for professional users, is that the track separation (gap between the two tracks) is 0.75 mm rather than 2 mm. The increase in the track width results in a greater increase in the track width results in a greater dynamic range (range between peak level and tape hiss at low level). However, the fre-quency range is only influenced by the tape speed and not the width of the sound track.
In mono full-track models the entire tape width is available for recording a single chanwidth is available for recording a single chan-nel. This results in a greater dynamic range of
Stereo half-track RF
Stereo half-track
Mono full-track
Stereo quarter-track
In this model the recording capacity of a tape is doubled. For this purpose the tape is subdi-vided into four narrower tracks. In one tape di-rection, the stereo signal is recorded on tracks 1 and 3. The tape can then be reversed and recorded on tracks 2 and 4. When working with quarter-track models, the track location should al-ways be noted together with the title, the tape speed, and the counter reading.
The C270 tape recorder requires no regular maintenance other than occasional cleaning of the capstan shaft, the pinch roller, the soundheads, and the tape guides, and de-magnetization of all metal parts that come in contact with the tape.
For this purpose we recommend the REVOX cleaning kit (Part No. 39000) and the REVOX demagnetizing choke. (Part No. 10.042.002.01)
Moisten a felt stick with cleaning fluid and clean all tape guidance elements. Then dry the cleaned parts with a new, clean felt swab or cleaning web.
mportant
Make sure that no cleaning fluid penetrates into the bearing of the capstan shaft or contacts the cover of the VU-meters because this would damage the bearings or the covers.
Demagnetizing
Cleaning
Switch off the tape recorder and remove the tape sufficiently far away from the recorder Slowly approach the part to be demagnetized cedure for all metal parts that come in contact with the tape (soundheads, tape guidance ele-ments, guide rollers, lifting pin). Withdraw the choke from the recorder (approx. 50 cm) before you switch it off.
Caution: The demagnetizing choke also demagnetizes your recorded tapes if the choke comes close to the tapes!
For correcting the frequency response, internationally standardized equalization networks are built into the record and reproduce path of the tape recorders.
are built into the record and reproduce path of the tape recorders. The attack points of the correction are referred to as transition frequencies or transition time constants and depend on the tape speed. They have been standardized by various organizations (IEC, NAB, AES, CCIR) as follows:
| TAPE | TRANSITION FREQUENCY, LOW AND HIGH | |
|---|---|---|
| SPEED | (TRANSITION TIME CONSTANTS) | |
| IEC - 1968 | NAB - 1965 | |
| 9,5 cm/s | 50 Hz; 1768 Hz | 50 Hz; 1768 Hz |
| 3,75 ips | (3180µs; 90µs) | (3180 µs; 90 µs) |
| 19 cm/s | 0Hz; 2273Hz | 50 Hz; 3183 Hz |
| 7,5 ips | (∞; 70µs) | (3180 µs; 50 µs) |
| 38 cm/s | 0 Hz; 4547 Hz | 50 Hz; 3183 Hz |
| 15 ips | (∞; 35µs) | (3180 µs; 50 µs) |
On the C270 tape recorder, the equalization networks are plugged into the RECORD EQUALIZER BOARD 1.777.540.00 and the REPRODUCE EQUALIZER BOARD 1.777.620.00. Due to this design it is possible to convert or recalibrate your recorder to different speeds or the other equalization standard.
Alternate tape speeds
The REVOX C270 tape recorders can easily be converted to other tape speeds. You will only need the corresponding plug-in boards for the desired tape speeds of the applicable equalization standard (IEC or NAB). The equalization networks for both channels (left and right) are implemented on one plug-in board each. This means that you will need one circuit board each for the record and the reproduce path
reproduce path.
| _ | ||||
|---|---|---|---|---|
|
TAPE
SPEED |
STAN-
DARD |
PART NO.: | PLUGGED IN ON: | |
| 9.5/19 cm/s | IEC | 1.777.550.00 | RECORD EQUALIZER BOARD | |
| 19/38 cm/s | IEC | 1.777.552.00 | RECORD EQUALIZER BOARD | |
| 9.5/38 cm/s | IEC | 1.777.554.00 | RECORD EQUALIZER BOARD | |
| 9.5/19 cm/s | NAB | 1.777.556.00 | RECORD EQUALIZER BOARD | |
| 19/38 cm/s | NAB | 1.777.558.00 | RECORD EQUALIZER BOARD | |
| 9.5/38 cm/s | NAB | 1.777.559.00 | RECORD EQUALIZER BOARD | |
| 9.5/19 cm/s | IEC | 1.777.630.00 | REPRODUCE EQUALIZER BOARD | |
| 19/38 cm/s | IEC | 1.777.632.00 | REPRODUCE EQUALIZER BOARD | |
| 9.5/38 cm/s | IEC | 1.777.634.00 | REPRODUCE EQUALIZER BOARD | |
| 9.5/19 cm/s | NAB | 1.777.636.00 | REPRODUCE EQUALIZER BOARD | |
| 19/38 cm/s | NAB | 1.777.638.00 | REPRODUCE EQUALIZER BOARD | |
| 9.5/38 cm/s | NAB | 1.777.639.00 | REPRODUCE EQUALIZER BOARD |
tom.
• Unfasten the eight fixing screws located on the side of the housing bay and remove the housing bay.
| . 30/200 | Í |
Unfasten the four screws [50] of the control panel and swing the panel over the head-block. The control panel can be secured in this position by pressing it against the recorder.
Refer to the UNIT LOCATIONS drawing in the set of diagrams (Section 1) in order to fami-liarize yourself with the layout of the unit and then pull the RECORD EQUALIZER BOARD 1.777.540.XX and the REPRODUCE EQUA-LIZER BOARD 1.777.620.XX out of the recor-der. Replace the equalization boards located on these assembles and reinstall them in the on these assemblies and reinstall them in the unit.
The microprocessor of the tape recorder now must be told for which tape speed the unit has been equipped. Two microswitches on the CONTROL BOARD 1.777.400.XX have been provided for this purpose. The 8-position switch is readily accessible from the left-hand side of the unit. Set the switch positions 4 and 5 according to the table below while the recorder is switched off
table below while the recorder is switched off.
The status of the eight switches is only scanned when the recorder is switched on. In order to activate the parameter change, briefly switch the recorder off and on again.
| SWITCH | POSITION | FUNC | TION | |
|---|---|---|---|---|
| Nr. 2 | Ir. 2 ON Auto rewind, can be activated with LOOP [15 | ctivated with LOOP [15] | ||
| Nr. 2 | OFF * Normal LOOP function, auto rewind off | tion, auto rewind off | ||
| Nr. 3 | C | N | Library mo | de wind on |
| Nr. 3 | OF | Ŧ* | Normal operation, li | brary mode wind off |
| Nr. 4 | ON | OFF | 0 E /10 cm/c | 275/7 Fine |
| Nr. 5 | ON | OFF | 9.5/19 cm/s | 3.7577.51ps |
| Nr. 4 |
ON
OFF |
0N | 9.5/29.cm/s | 3 75 /15 inc |
| Nr. 5 | 3.57 30 cm/s | 0.70710105 | ||
| Nr. 4 | OFF | 0.5/10 cm/c 2.75/7.5 inc | 375/75ips | |
| Nr. 5 |
OFF
ON * |
Nr. 5 OFF | 3.57 13 011/5 | 5.7677.5198 |
| Nr. 6 | MIC/LINE SWIT | CH BOARD exists | ||
| Nr. 6 | C | FF | MIC/LINE SWITCH E | BOARD does not exist |
| Nr. 7 | 0 | N * | Normal operation, re- | cord function enabled |
| Nr. 7 | C | )FF | Recording inhibited, o | nly play mode allowed |
| Nr. 1 | 0 | N * | Normal reco | rder operation |
| Nr. 8 | 0 | N * | ext. Varispe | eed disabled |
| Nr. 1 | ( | ON | Ender etc | at enabled |
| Nr. 8 | C | DFF | rader sta | |
| . Nr. 1 | 0 | DFF | aut Marian | and apphied |
| Nr. 8 | ( | NC | ext. Vansp | aed engbled |
Your tape recorder has been factory-aligned exactly to specifications. In the following paragraphs you will not find any detailed instructions for calibration or recalibration of your machine but only a definition of the commonly used levels and measuring variables. Detailed calibration instructions can be found in the service instructions for the C270 tape recorder (order No.: 10.30.0920).
This level has been derived from the 1mW power level in any load resistance. The voltage drop across a 600 ohm load is 0.775 V. This voltage is defined as 0 dBm (regardless of the load).
This level corresponds to a voltage of 0.775 V regardless of the load resistance. [dBu] is occasionally used in place of the voltage level [dBm].
The line level refers to the level that is • available at the output of a tape recorder when a tape with reference fluxivity is being played, or
fed into the input of a tape recorder when a recording produces reference fluxivity.
CCIR designation for line level; this level produces a reading of 0 dB on a quasi peak program meter (PPM).
A term commonly used in the USA for a tape flux of 250 nWb/m (for recording on high-output tapes) or 200 nWb/m (for recording on standard tapes); this level produces a VUmeter reading of 0VU.
Level definitions
Voltage level
0 dBm (= 0.775 V)
0 dBu (=0.775 V)
Line level
Voltage reference level
Standard reference level (operating level)
Peak Level
A term commonly used in the USA for a level that is 8 to 10 dB higher than the operating level. For reasons of simplicity, a peak level of + 6 dB relative to operating level (double the voltage level) is used.
IEC/CCIR calibration
| DEFINITION: |
LINE LEVEL
[dBm] |
VU-METER READING
[dBm] |
|---|---|---|
| REFERENCE LEVEL: | 0 | 0 |
NAB calibration
| DEFINITION: |
LINE LEVEL
[dBm] |
VU-METER READING
[dBm] |
|---|---|---|
| OPERATING LEVEL: | + 4 | 0 |
| "PEAK LEVEL": | +10 | +6 |
Technical data
better than -
23 kg
. 80
20. 0-
ô
Dimensions
36
Socket assignment
The sockets on the rear panel of the unit are wired in accordance with the following diagram.
The sockets are drawn from the front. Connections not wired are to be kept free.
XLR IN [56] [57]
XLR OUT [51] [52]
FADER SYNC [54] FREE HEAD
OUT1
CH1-
AUDIO GND
-CH2 OUT V1
RS-232 [55]
37
SECTION 5
Index of key functions
| Fron | t panel: | ||
|---|---|---|---|
| Elem | ent | Function | Page |
| [1] | POWER | Power switch, switches the recorder on and off. | 6 |
| [2] | Left-hand spindle, supply motor. | ||
| [3] | Right-hand spindle, take-up motor. | ||
| [4] | Tacho roller for real-time counter. | ||
| [5] | Light barrier for detecting the transparent tape leader or a torn tape. | ||
| [6] | Tape sensor arm, controls the tape tension. | ||
| [7] | Real-time counter, displays the actual playing time in hours, minutes, and seconds as well as system parameters. | ||
| [8] | SEL | Selection key, causes the content of the address locator to be displayed, selects one numeric position of the display for modification with the STEP [9] key. | 17 |
| [9] | STEP | Step key, modifies the numeric display position selected with SEL [8] in one step increments. | 17 |
| [10] | TRANS | Key for storing the tape position displayed on the real-time counter in the address locator (A–LOC). The displayed value can first be modified by means of the SEL [8] and STEP [9] keys. | 17 |
| [11] | SEARCH | Positions the tape at the address defined on the display with the SEL [8] and STEP [9] keys without overwriting the old content of the address locator (A–LOC) with the new address. | 18 |
| [12] | RESET | Reset key, resets the counter to zero (00.00.00). | 19 |
| [13] | Z-LOC | Zero locator, positions the tape at the address 00.00.00. PLAY mode can be preselected. | 16 |
| [14] | A-LOC | Address locator, positions the tape at the address stored in the A–LOC with the TRANS [11] key. PLAY mode can be preselected. | 17 |
| [15] | LOOP |
Activates the LOOP mode. The recorder plays the tape section endless-
ly between the tape address 00.00.00 and the address stored in the A-LOC. The address in the A-LOC can also be negative. This function can be cancelled by pressing the LOOP key again or any tape transport key. |
19 |
| [16] | T-DUMP | Switches the waste basket (tape dump) mode on or off. The right-hand spooling motor is switched off; the unwanted tape sections can be played into the "waste basket" by means of the PLAY [20] function. | 20 |
| [17] | EDIT | Switches the edit mode on or off. By rotating the right-hand spindle or by means of the keys << [18] or >> [19] the tape can be shuttled backward and forward in order to find a specific segment. | 21 |
| [18] | ~< |
Rewind key for fast rewinding of the tape. The tape is wound on the left-
hand pancake. |
. 9 |
| [19] | >> | Fast forward key for spooling the tape forward. The tape is wound on the right-hand pancake | 9 |
| Elem | ent | Function | Page |
|---|---|---|---|
| [20] | PLAY | Reproduces the tape. Is used in conjunction with the REC [22] key for activating the record mode. | 9 |
| [21] | STOP | Pressing of this key stops all tape transport functions and all selected modes except dump edit mode. | 9 |
| [22] | REC |
To be pressed together with PLAY [20] for enabling the record mode.
Recordings can only be made on channels switched to READY. |
9 |
| [23] | VU-meter for indicating the level of channel 1 (left) with three peak level LEDs for + 6, + 9, and + 12 dB. | 6 | |
| [24] | READY | Readies channel 1 (left) for recording. The red LED above the key flashes. During a recording, i.e. after REC [22] and PLAY [20] have been pressed, this LED is continuously lit. | 12 |
| [25] | INPUT |
Output selector. The input signal is indicated on the VU-meter [23] and
can be heard via the monitor outputs. |
11 |
| [26] | SYNC | Output selector. The recording is reproduced via the record head with degraded frequency response. Permits recording of channel 2 in synchronism with an existing recording on channel 1. | 6 |
| [27] | REPRO |
Output selector. The recording is reproduced via the reproduce sound-
head. This function can also be activated while a recording is in pro- gress so that the quality of a recording can be continually checked (tape/source monitoring). The signal from the reproduce head is also available on the VU-meter [23] and the monitor outputs. |
10 |
| [28] | INPUT CH1 | Input level control for channel 1. In the UNCAL [30] position it influences the recording level of channel 1. | 11 |
| [29] | MIC |
Input selector. Activates the record mode via microphone (both chan-
nels). This function can only be selected if the tape recorder is equipped with the optional MIC/LINE SWITCH BOARD. |
11 |
| [30] | UNCAL |
Activates the uncalibrated record mode. The record level can be adju-
sted via the INPUT CH1[28] and INPUT CH2[37] level potentiometers. This mode is automatically activated by the input selector [29]. |
10 |
| [31] | LINE | Input selector. Activates the recording path via the LINE INPUT CH1 and LINE INPUT CH2. Recording with calibrated or uncalibrated (UNCAL [30]) level is possible in this mode. | 10 |
| [32] | VU-meter for indicating the level of channel 2 (right) with three peak level LEDs for + 6, + 9, and + 12 dB. | : | |
| [33] | READY | Readies channel 2 (right) for recording. The red LED above the key flashes. During a recording, i. e. after REC [22] and PLAY [20] have been pressed, this LED is continuously lit. | 12 |
| [34] | INPUT | Input selector. The input signal is indicated on the VU-meter [32] and can be heard via the monitor outputs. | 11 |
| [35] | SYNC | Output selector. The recording is reproduced via the record head with degraded frequency response. Permits recording of channel 1 in synchronism with an existing recording on channel 2. | 6 |
| Element | Function | Page | |
|---|---|---|---|
| [36] | REPRO |
Output selector. The recording is reproduced via the reproduce sound-
head. This function can also be activated while a recording is in pro- gress so that the quality of a recording can be continually checked (tape/source monitoring). The signal from the reproduce head is also available to the VU-meter [32] and the monitor outputs. |
10 |
| [ 37] | INPUT CH 2 | Input level control for channel 2. In the UNCAL [30] position it influences the recording level of channel 2. | 11 |
| [38] | OUTPUT CH1/2 | Output level potentiometer for channel 1 (inner knob) and channel 2 (outer ring). In the UNCAL [39] position of the reproduce amplifier, the output level of the LINE OUTPUT CH1 and LINE OUTPUT CH2 can be influenced by means of these level potentiometers. | 10 |
| [39] | UNCAL | Activates the uncalibrated reproduce mode. The output level can be adjusted by means of the level potentiometers OUTPUT CH1 and OUTPUT CH2 [38]. | 11 |
| [40] | SLOW | Switches to the slower of the two available tape speeds. If this key is pressed continuously, the nominal tape speed is shown as "ips" (inches per second) on the display [7]. | 8 |
| [41] | FAST | Switches to the faster of the two available tape speeds. If this key is pressed continuously, the nominal tape speed is shown as "ips" (inches per second) on the display [7]. | 8 |
| [42] | VARIABLE | Activates the varispeed mode (variable tape speed). The tape speed can be influenced with the SPEED DEVIATION [43] potentiometer. | 15 |
| [43] | SPEED DEVIATION | Potentiometer for varying the tape speed steplessly in varispeed mode (VARIABLE [42] key) within the range of – 33 % to + 50 % of the selected nominal speed. | 15 |
| [44] | SELECTOR | Monitor selector switch. Influences the reproduction via the monitor speaker and the monitor outputs. The outputs LINE OUTPUT CH1 and LINE OUTPUT CH2 are not affected. | 14 |
| [45] | PHONES | Phones socket. The built-in monitor speaker is switched off when the headphones are plugged in. | 13 |
| [46] | VOLUME |
Volume control. Varies the volume of the built-in monitor speaker as well
as the headphones output. The monitor speaker can be switched on by pulling out this knob and switched off by pushing it in. |
13 |
| [47] | Pinch roller. Presses the tape against the capstan shaft. Optimum tape transport is only ensured if this roller is in perfect condition (undamaged). | 29 | |
| [48] |
Tape scissors and splicing block. Permits convenient cutting and splic-
ing of the tape. |
22 | |
| [49] | Cutting mark. If the tape is held in this position and inserted into the splicing block [48] in such a way that the position on which the cutting mark was located is aligned with the right-hand side of the housing, that tape address will be located under the scissors which previously was located before the head gap of the reproduce head. | 22 | |
| [50] | Fixing screws of the control panel. | 32 | |
Rear panel:
| Element | Connection parts | Page | |
|---|---|---|---|
| [51] | LINE OUTPUT CH 2 | Channel 2 output. The output level can be set with level controller OUTPUT CH1/2 [38]. | 5 |
| [52] | LINE OUTPUT CH1 | Channel 1 output. The output level can be set with level controller OUTPUT CH 1/2 [38]. | 5 |
| [53] | MONITOR | Output for an auxiliary monitor amplifier with speakers. | 13 |
| [54] | FADER/SYNC | TTL signal (0 V/+ 5 V) input for external control of tape speed within the range – 33% to + 50%. Control frequency for nominal speed: 9.6 kHz. | 15 |
| [55] | RS-232 | Socket for serial connection RS-232, 9600 Baud. | |
| [56] | LINE INPUT CH 2 |
Channel 2 signal source (amplifier, mixing console) line input (XLR ba-
lanced). |
5 |
| [57] | LINE INPUT CH1 |
Channel 1 signal source (amplifier, mixing console) line input (XLR ba-
lanced). |
5 |
| [58] | MIC INPUT CH 2 | Channel 2 microphone line input (XLR, balanced). | 11 |
| [59] | MIC INPUT CH1 | Channel 1 microphone line input (XLR, balanced). | 11 |
| [60] | AC POWER | Power connection and voltage selector. | 25 |
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