Alesis AI-2 инструкция обслуживания

A L ES I S AI-2 Reference M a nu a l[...]

TABLE OF CONTENTS CHAPTER 1: INTRODUCTION 1.0 ABOUT AI-2 ................................ ............................................. 1 1.1 IMPORTANT NOTES ABOUT THIS MANUAL ....................... 3 1.2 OVERVIEW OF MAIN FUNCTIONS ................................ ........ 3 1.2A Multiple Control Methods ................................ ..........[...]

CHAPTER 4: GETTING STARTED 4.0 POWER ON PROCEDURE ................................ ................... 24 4.1 ADAT ID NUMBERS ................................ .............................. 25 4.2 AI-2 CONFIGURATION ................................ .......................... 25 4.2A Time Code and Sample Rates ................................ ......[...]

6.4A Normal Operation ................................ ........................... 47 6.4B Setup Operation ................................ .............................. 48 6.4C Set/Hold Operation ................................ ......................... 49 6.5 SETUP MENUS AND FUNCTIONS ................................ ...... 50 6.5A ADAT Menu ..[...]

CHAPTER 8: APPENDICES 8.0 APPENDIX 1: SPECIFICATIONS ................................ ......... 67 8.0A Operating Codes ................................ ............................ 67 8.0B Reference Sources ................................ ......................... 67 8.0C Time Code Reader ................................ .........................[...]

1 CHAPTER 1: INTRODUCTION 1.0 ABOUT AI-2 The AI-2 is an extremely flexible and powerful interface device for the ALESIS ADAT 8-track digital audio tape recorder. The AI -2 i s designed and manufactured for ALESIS by TimeLine, the world leader in machine control and synchronization systems. The AI-2 provides a universal ADAT control interface allowi[...]

2 • Storage of Setups. The AI-2 can read and write setup informa - tion to the beginning of each ADAT tape, for later retrieval. This information (tape table of contents) is in the same format as the ALESIS BRC information. The AI -2 can read existing BRC information from the tape and will use only the data that it requires. The AI -2 intelligent[...]

3 1.1 IMPORTANT NOTES ABOUT THIS MANUAL The AI-2 is an extremely easy to use interface, and has been designed to automatically configure, depending on the control signals that are detected. Although it is possible and extremely tempting to just plug in and start working, we strongly urge that you read the chapter, Getting Started in this manual, an[...]

4 AI2022A Sync Out Sync In MASTER ADA T SLA VE ADA T ALESIS AI-2 Sync In Sync Out V IDEO R EFERENCE AUDIO OR VIDEO TRANSPOR T EXT WORD CLOCK TIMELINE SYNCHRONIZER VIDEO EDITOR ALESIS BRC MIDI COMPUTER MIDI T ime Code Wo r d Clock MIDI T ime Code Chase Control REWIND FAST FWD STOP PLAY RECORD EJECT POWER 12345678 Optional-See Section 3.2 When using [...]

5 The AI-2 has comprehensive reference select options, which have been structured to accommodate any possible combination of reference source, time code and sample rate. Each of the variables can be set in the REFERENCE menu. The AI-2 effortlessly handles the conversions and controls the ADAT at the correct speed. 1.2E Status LEDs and Messages The [...]

6 1.3 INPUT CONTROL MODES The AI-2 can be controlled by one of four methods. 1. The AI-2 and the attached ADATs are controlled by a video editor, or similar device, via a RS422 cable using standard Sony protocols. The AI-2 emulates the functionality of the Sony PCM- 7030 digital audio tape recorder. 2. The AI-2 and the attached ADATs are controlled[...]

7 1.5 "ENGAGED" VS. "DISENGAGED" TAPES Analog audio recorders typically move tape past the heads between 1-7/8 and 30 inches per second. Higher play speeds result in a higher bandwidth, or the ability to record high-frequency signals on tape. ADAT digital audio signals require a much higher bandwidth than analog audio. To provid[...]

8 CHAPTER 2: INSTALLATION The AI-2 is a 1 unit high 19" Rack mount device. We recommend that you install the AI-2 in the same rack or close to the ADAT transports, permitting connection to the first ADAT transport with a standard ALESIS 9-pin sync cable. If it is not possible to locate the AI-2 adjacent to the ADAT, then the sync cable should [...]

9 2.2 REFERENCE CONNECTION The AI-2 reference connections are used to connect an external speed reference. Connectors are provided for time code, word clock and video signals. These signals are used to control the speed the ADAT machines will run at when in Play. 2.2A RDR IN The RDR IN connector is a 1/4" TRS jack. The reader input is differen[...]

10 2.3 CONTROL CONNECTION The AI-2 control connections are used to connect an external controller. Connectors are provided for a video editor or similar controller, the TimeLine Lynx-2 or Micro Lynx synchronizers, and MIDI. These inputs are used to control connected ADATs through the AI-2. The reader input can also be considered a control source wh[...]

11 2.3D MIDI OUT The MIDI OUT connector is a 5-pin din socket. The MIDI output is used for MIDI Machine Control responses (MMC), AI-2 responses and BRC responses to external commands, and for MIDI Time Code (MTC). Connect a MIDI cable to this socket when using an external MIDI controller that requires MIDI responses. 2.4 BRC CONNECTION The AI-2 BRC[...]

12 2.4E W/C OUT The W/C OUT connector is a female BNC socket. The word clock output is a 5V TTL signal. Connect a BNC to BNC cable from this output to the BRC 48 KHz input. This connector feeds either external word clock or the AI-2 sample clock generator output to the BRC. 2.5 ADAT CONNECTION The AI-2 ADAT connection is used to connect the AI-2 to[...]

13 AI2021A FRONT P ANEL REAR P ANEL LCD Display AI-2 Control and Setup Keys Control and Communication Status LEDs Power Switch Eight Position Configuration Switch 9-12V AC Power Connector Reader Input 1/4" TRS Jack Word Clock Input BNC Connector Editor 9 Pin D Connector L ynx-2/Micro L ynx Synchronizer 25 Pin D Connector V ideo Input BNC Conne[...]

14 CHAPTER 3: APPLICATIONS 3.0 AI-2 INTERFACING The AI-2 is designed to quickly and effectively integrate the Alesis ADAT digital audio tape recorders into studio and post production facilities. The AI-2 can be used for a wide range of applications, from basic chase synchronization to full control of 16 ADAT transports from a video editor. The firs[...]

15 3.1 INTERFACING TO ONE OR MORE ADAT'S The AI-2 is used to connect one or more ADATs to a control system. The basic ADAT connection is shown here. When the AI-2 is powered on it takes control of the ADAT chain and automatically assigns machine IDs to the connected ADATs. Although by itself the AI-2 cannot control the ADAT chain, if a referen[...]

16 3.2 INTERFACING TO THE BRC REMOTE CONTROL The AI-2 can be used to control one or more ADATs through the BRC, this allows an "ADAT system" to be connected to a machine control system or video editing system. The AI -2 communicates with the control system and the BRC which can be used to provide such features as track enable buttons and [...]

17 Note, that the ADAT SYNC OUT connector on the AI-2 rear panel is unconnected for this mode of operation. When all connections have been made, and the units powered on, the BRC/ADAT LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the units. If the LED does not light (no communica[...]

18 If required, an external digital audio sample rate clock may also be connected to the W/C IN connector in the reference section of the AI-2 rear panel. For the system to operate satisfactorily, the external sample rate clock must b e correctly synchronized to the video reference signal connected to the video input. When the Editor is connected a[...]

19 An external digital audio word clock can be connected to the reference W/C IN connector. The same precautions apply as for the video editor interface, the word clock and synchronizer system must both be locked to the same reference signal. For example, if the synchronizer system is referenced to video sync, then the word clock must also be refer[...]

20 3.5 TIME CODE CHASE INTERFACE The AI-2 has a high resolution bi-directional time code reader that has been specifically designed for time code chase applications. The reader can read all time code types, at any rate, including discontinuous high speed code. The AI-2 thereby ensures that ADAT tape recorders can be integrated into a system when on[...]

21 On the AI -2 front panel, the LTC LED will illuminate when valid time code is being received at the rear panel reader input. If the LED does not light or is flickering then check the time code cable or the output level of the time code source. 3.6 EXTERNAL MIDI INTERFACING MIDI MACHINE CONTROL The AI-2 can be controlled from a MIDI controller or[...]

22 During operation the MMC LED on the AI -2 front panel illuminates to indicate valid MIDI data is being received. If the LED does not light (no communications) or is flashing (communication taking place, but with errors), then recheck the MIDI cable connections and make sure that the MIDI controller or software is actually generating MMC messages[...]

23 AI2018A Sync Out Sync In DIGIT AL TRANSFER WITH THE AI-1 Sync In Wo r d Clock In Digital I/O Digital I/O Sync In Sync Out MASTER ADA T SLA VE ADA T ALESIS AI-2 ALESIS AI-1 60-250 VAC 50-60 Hz 48kHz OUT ADA T SPDIF AES/EBU SPDIF SYNC OUT SYNC IN IN OUT IN OUT IN OUT IN OUT –10 dBV ANALOG INPUTS +4 dBu ANALOG OPTICAL DIGITAL INPUT DIGITAL OUTPUT[...]

24 CHAPTER 4: GETTING STARTED 4.0 POWER ON PROCEDURE Each time the AI-2 is powered up it runs through a series of initial- ization tests and displays the current configuration. The power on routine tests all front panel for two seconds and then runs through the following display sequence where the AI-2 configuration is displayed in approximately on[...]

25 SO N Y T i m e C o d e T y p e Displays the selected frame rate and 29 . 97H z / D F time code type. R E A D F R O M T A P E Prompts to read data from the tape header. S TOR E T O C ON F I R M Press the STORE key to confirm and read the data or press the DISPLAY key to cancel and continue. 48 . 000K 2 9 . 9 7 / D F Default display, which shows S[...]

26 the DISPLAY key to cancel the read from tape operation. To disable the automatic power up read from tape prompt, set read tape to off in the commands menu. On initialization the default AI-2 control mode is set to auto. The AI-2 will check the control ports for communication and switch accordingly, if no communication is detected then the AI -2 [...]

27 The AI-2 determines a sample rate ratio from the frame rate and sample rate options selected in the reference menu. The actual time code position is then calculated by subtracting the AI-2 offset from the ADAT tape position determined using this sample rate ratio. From this it can be seen that when either the sample rate or frame rate is changed[...]

28 Connect a time code source to the reader input, the time code sup- plied should be between zero and forty five minutes. Put a format - ted tape in the first ADAT transport and press the AI-2 ONLINE Key. Now start the time code source, the ADAT will cue to the reader time code position, go into play and lock. Press the DISPLAY key until the posit[...]

29 4.6 TRIM AN OFFSET To trim an offset press the DISPLAY key until the offset register is shown in the display. Press the SET/HOLD key, the frames digits will start to flash, press the SET/HOLD key again to select the desired pair of time code digits, then use the DOWN and UP keys to adjust the offset. When adjusting time code frames or subframes [...]

30 The AI-2 can be used to save status information to the ADAT tape header at the end of a session. The AI -2 transfers project informa- tion, such as code type, and most significantly the Cue start and Tape start times, this allows offsets to be automatically recalled at a future date. The information is saved in BRC format, so it can be read by e[...]

31 CHAPTER 5: OPERATIONAL FEATURES 5.0 MODES OF OPERATION The AI-2 has four modes of operation, Normal, Set/Hold, Command and Setup. These modes are described in detail in this section. The AI-2 will usually be used in Normal mode. Set/Hold mode is used to modify and transfer times between registers. Command mode is used for data read and save oper[...]

32 C U E S t a r t T i m e Only displayed when Cue menu option, L 00: 00: 00: 00. 00 Use Times is set to on. The time code displayed is for the current cue, selected in the Cue menu. If the cue start time is modified by the Set/Hold or capture process, then the start time in the Cue menu will be updated. The cue start time is normally read from the[...]

33 P o s i t i o n E r r o r The ADAT transport position error. In play L0 . 0 0 shows subframe error. In time code chase shows, the difference between the time code input and the ADAT or distance between master and slave. In control modes shows, difference between requested location and actual ADAT position. R e a d e r I n p u t The time code val[...]

34 5.2 SET/HOLD MODE The SET/HOLD key can be used to "capture" any time code num - ber except the ADAT position error display register. Pressing the SET/HOLD key and holding it down continuously "holds" or freezes the display for observation for two seconds and then releases it to continue incrementing normally. This allows the [...]

35 code reader input and enters it in the Offset register. To use the capture feature press and hold the STORE key and then press SET/HOLD. 5.3 COMMAND MODE 5.3A Method for Actioning Destructive Functions Press the SETUP key to enter Setup mode. Repetitively press the MENU key to select the Commands menu, press the LAST/NEXT keys to select the Data[...]

36 5.3C Read Tape Reads data from the first ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. The AI -2 reads and stores every piece of data in the ADAT tape header, even information that the AI -2 does not require. This permits a future Save Data operation to rewrite to tape all the or[...]

37 manual. In Setup mode, the function of the front panel keys changes, as indicated by the gray italic legends to MENU, LAST, NEXT, DOWN and UP. The SETUP key toggles in and out of Setup mode, which can be entered at any time. Press the SETUP key to enter Setup mode and press the key again to exit Setup mode and return to the normal display. The t[...]

38 5.5 SAVING TO TAPE The AI-2 is equipped to save information to the ADAT tape data header. The AI -2 will transmit cue start times, tape start times, pitch information and ADAT operational status such as cross fade time, all safe status and auto input status over the ADAT sync port to the ADAT machines. Press the front panel SAVE key then the STO[...]

39 29.97 Hz/30 and if on, to 25 Hz/25. This however automatically switches if a different code type is detected at the reader input. The digital audio sample rate at the AI-2's word clock outputs is always set to the ADAT's standard operating frequency of 48.000 KHz 5.8 LONGITUDINAL TIME CODE (LTC) The AI-2 has a longitudinal time code ge[...]

40 AI2014A TIME CODE MIDI TIME CODE LONGITUDINAL TIME CODE REFERENCE W/C IN RDR IN VID IN CONTROL LYNX-2 / MICRO L YNX MIDI OUT IN BRC MIDI OUT IN THRU GEN OUT W/C OUT SYNC OUT ADAT POWER CONFIG EDITOR S/N ALESIS AI-2 MANUFACTURED BY TimeLine Vista, Inc. MADE IN USA ALESIS CORPORATION, LOS ANGELES CAUTION: TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE [...]

41 The AI-2 simultaneously generates serial time code for a video editor or synchronizer, LTC, MTC and sample clock, which is sent to the ADAT transport via the SYNC OUT connector or the BRC via the W/C OUT connector. When the AI-2 synchronizes the ADAT, the time code rate, word clock rate, and the speed of the ADAT tape itself are controlled so th[...]

42 5.11A External Word Clock Reference The AI-2 sample rate and time code are derived from an external word clock present at the W/C in connector and one of the three "secondary" frame reference signals described below, Lynx synchronizer, video or internal. Word clock by itself does not contain frame information so the AI-2 will derive it[...]

43 The AI-2 sample rate and time code are derived from a variable internal reference which is adjustable in one cent steps. The AI - 2 displays the pitch variation in cents and an equivalent speed per- centage read out. The range available at 48 KHz is from +100 to -300 cents. The range at other sample rate frequencies will be different, but consis[...]

44 CHAPTER 6: FEATURES AND CONTROLS 6.0 FRONT PANEL The AI-2 front panel has a power switch, eight status LEDs, six function keys and a two row, sixteen character Liquid Crystal display (LCD) with an orange backlight. The status LEDs are used to give continual user feedback of the AI -2 operating state. When the LEDs are on, the AI-2 is operating c[...]

45 When a new message is added to the AI-2 error stack, the NON STD LED will flash. The messages can be viewed by pressing the STORE key and each time the STORE key is pressed the next message in the stack is displayed. When all the messages have been read, the stack is cleared and the LED stops flashing. • BRC/ADAT LED. Lights when valid communi[...]

46 6.3 DISPLAY The AI-2 display is used to indicate status information such as sample rate and time code information, and in SETUP mode to enter AI-2 operational parameters. The display is also used to show context sensitive warning messages and system error messages. The upper line normally indicates the selected AI -2 time code register, and the [...]

47 6.4 FRONT PANEL KEYS AI-2 function control is provided by a switch matrix with six keys. These keys are used to configure the AI-2 operational parameters, and to permit the user to control basic functions and select one of a number of available time code registers to display. 6.4A Normal Operation In normal operation the keys have the following [...]

48 and any current session information such as offsets back to the ADAT tape header. The save command requires confirmation with the STORE key. • ONLINE. Used to allow the AI-2 to be controlled externally. The ONLINE key is a toggle that permits the selected control source, editor, synchronizer system, time code chase or MMC to take control of th[...]

49 • DOWN. Moves down one submenu option or value. • UP. Moves up one submenu option or value. • CLEAR = DOWN + UP. Press the DOWN and UP keys simul- taneously for 1/2 second. Used to reset or clear some AI - 2 submenu options to the default setting or zero, prior to entering a new value. 6.4C Set/Hold Operation In set/hold operation, the key[...]

50 6.5 SETUP MENUS AND FUNCTIONS The AI-2 has a setup or configuration structure comprised of separate menus. The items in each menu are grouped by function. The following tables and descriptions explain the operation of each of the functions. The front panel MENU key is used to select a menu, the LAST and NEXT keys step through submenus and the DO[...]

51 • Digital In. Used to switch the audio input of all connected ADAT transports to the fiber optic digital input. • Track Delay. Used to turn track delays on or off, if delays have been read from the ADAT tape header. Track delays can not be entered from the AI-2 front panel. 6.5B Commands Menu The commands menu is used to set default command [...]

52 6.5C Control Menu The Control menu is used to select the type of controller and set editor, and time code chase synchronizer options. Menu Submenu Option Description CONTROL Mode: RDR CHASE Time code chase. SONY Editor input. LYNX Lynx-2/Micro Lynx synchronizer. AUTO Detects serial communications and automatically selects controlling device. Emu[...]

53 • Flywheel. The number of frames the AI-2 will flywheel when in time code chase. In normal operation this number should be 10 frames, which permits significant interruption to the time code input, while retaining positive transport response. The continuous option can be used when it is desired to run the ADAT transports for longer than the ava[...]

54 Cue times can not be edited in this menu, but if the Use Times option is set to on, they can be selected in the main display rotation and edited by the set/hold process. The cue start time is also automatically updated when the AI-2 offset is altered. If no data has been read from tape, the AI -2 will default to Cue #1. Menu Submenu Option Descr[...]

55 6.5E MIDI Menu The MIDI menu is used to control the MTC generator and select AI-2 data for MIDI SysEx dump. Midi information can be transferred bi-directionally from one AI-2 to another AI-2, the BRC or an external MIDI storage device. Menu Submenu Option Description MIDI MTC: O n Default. Off Data: Select data for MIDI SysEx dump. Global Save A[...]

56 6.5F Reference Menu The reference menu is used to select the system reference, code type and rate and the tape time output, generator modes. The AI-2 internal speed and rate computations are all determined by the options selected in this menu. Menu Submenu Option Description REFERENCE Input W/C, Lynx Word clock in and Lynx frame edge. W/C, Vid W[...]

57[...]

58 • Input. Used to select the ADAT system speed reference source. The default reference selection is determined by the method of control selected in the control menu. If SONY editor is selected the reference will default to external video. If Lynx is selected the reference will default to Lynx and if time code chase is selected the reference wil[...]

59 sync video signal at video black level locked to the AI-2 system reference. If the option card is on then the AI-2 video input BNC is used as a video output and may be connected to the sync input of a VTR or other transport that needs to be reference to the ADAT system. 6.5G Status Menu The Status menu has three items the number of connected ADA[...]

60 The tracks menu is used to select the track control method and to allocate or map tracks to editor track enables. The highest track available for track mapping is determined by the number of ADATs connected. If a track previously mapped is no longer available because the number of ADATs connected has been reduced then the selected tracks will fl[...]

61 • Selection. Used to determine the track control method. The selections are editor control, Lynx control (which is also used for MMC track control), and local at the front panel of the ADAT transports. • Mapping. The mapping option determines the operation of the following map to, track assignment selection. Single tracks, pairs of tracks or[...]

62 CHAPTER 7: ADVANCED FEATURES Chapter seven contains information on a number of features or procedures that are not covered in other sections of the manual. Some of the information in the chapter has been included for completeness and should not be considered an advanced feature. 7.0 ADAT DIGITAL INPUT The AI-2 ADAT menu digital input option is u[...]

63 7.1B Time Code Number Differences In certain situations there will be a slight difference between the AI-2 time code display and the time displayed on the front panel of the ADAT. This time difference is due to the fact that the ADAT transport always displays "real" time and therefore only uses four of the six possible rate/code type d[...]

64 If a clean MTC only feed is required, a MIDI controlling device must operate in open loop mode. 7.3B BRC Control Feed Through The AI-2 permits MIDI control and response feed through to the BRC from the MIDI input and output connectors. This is provided so that devices which are designed to control the BRC through its MIDI connectors can still do[...]

65 whenever SysEx information is transmitted to the AI -2 MIDI IN connector. 7.4 REAR PANEL CONFIGURATION DIP SWITCHES • Switch 1. Is used to configure the AI-2 so that after a memory clear the default settings will initialize for 25 frame operation. Once the AI-2 is configured the selected options will be retained in battery ram and used each ti[...]

66 SW 5 SW 6 MIDI Device ID OFF OFF 0 0 h e x O N O F F 29 hex O F F O N 49 hex O N O N 69 hex • Switches 7 and 8. Are not currently implemented and have been reserved for future use. 7.5 EXT WORD CLOCK The AI-2 will measure the frequency of an external word clock reference and display the measurement in the status menu. The AI-2 measurement has [...]

67 The OFFLINE key is used to release all ADAT transports from AI-2 control. The master ADAT will automatically assume control of the slave ADATs. Individual machines in an ADAT chain can be taken "offline" by ejecting the ADAT tape. The AI -2 will detect when a tape is ejected and if necessary automatically reassign the master transport.[...]

68 CHAPTER 8: APPENDICES 8.0 APPENDIX 1: SPECIFICATIONS 8.0A Operating Codes SMPTE (30 fps NDF) SMPTE (29.97 fps NDF) SMPTE Drop Frame (30 fps DF) SMPTE Drop Frame (29.97 fps DF) EBU (25 fps) Film Code (24 fps) Generator Output Unbalanced Signal Output Level 1 Vpp fixed Output Impedance 330 ohms Signal Rise Time 4 microseconds Time Code Stability ?[...]

69 8.0D ADAT Synchronizer Lock Time 2 to 3 seconds, nominal User Adjustment None 8.0E Control Editor Interfaces Serial RS422, 38.4 Kbaud. Conforms to ANSI specification Synchronizer Interface Serial RS422, 38.4 Kbaud. Conforms to ANSI specification MIDI Interface Serial, 31.25 Kbaud. Conforms electronically to the standards specified in the MIDI 1.[...]

70 8.0H Interconnections The connectors mounted on the rear of the AI-2 are as follows: POWER 2.5 mm Male socket RDR IN 1/4" Female stereo jack EXT VID BNC Female connector EXT W/C BNC Female connector EDITOR RS422 9-pin Female 'D' connector MIDI IN 5-pin Din Female connector MIDI OUT 5-pin Din Female connector MIDI IN BRC 5-pin Din [...]

71 8.1 APPENDIX 2: INTERFACE INFORMATION 8.1A Sony Editor Constants If your editor does not recognize the SONY PCM-7030 machine ID, the editor machine constants should be set as follows: Constant Values (in hexadecimal) V T R Item number 1234567891 0 1 1 1 2 1 3 1 4 1 5 PCM-7030 (30 Fr) 7 0 0 0 0 0 9 6 0 5 0 5 0 3 8 0 0 A 0 7 F F 0 0 0 0 5C F F Des[...]

72 Item Number Setting Details of Setting 11 AFTER SYNC DELAY -- After synchronization, when changing to play mode, specifies the optimum command delay for the servo to lock in the correct position from low speed. (In frame units, correction value) 12 AFTER SYNC DELAY + After synchronization, when changing to play mode, specifies the optimum comman[...]

73 8.1D External Word Clock The AI-2 will accept a 48k 5V TTL external word clock signal. The word clock should ideally be supplied by a high quality digital reference generator. A constant stable word clock reference is required for communication between the AI -2 and the ADAT transports. If word clock is selected as the AI -2 reference source and[...]

74 8.2 APPENDIX 3: MAINTENANCE/ SERVICE INFORMATION 8.2A Cleaning First, turn the unit off and disconnect the AI -2 wall mounting power supply. Use a damp cloth, with a mild detergent to clean the front panel of the AI-2. Under no circumstances use an abrasive cleaner or chemical solvent, this will damage the front panel finish. 8.2B Maintenance Th[...]

75 8.3 APPENDIX 4: TROUBLESHOOTING Symptom Solution Front panel display does not light. The AI -2 power supply is not connected or is faulty. Check the 2.5 mm power connection and make sure that the wall transformer is plugged in properly. If this fails to correct the problem, try another power supply. The AI -2 fails to ID all the connected ADATs.[...]

76 Symptom Solution Reference LED flashes. The selected system reference is not present or the AI -2 can not lock to it. Make sure that the correct reference source is selected in the reference menu. Check that the reference signal is connected. Non Std LED flashes. System messages have been placed in the A I -2 message stack. Press the STORE key t[...]

77[...]

78 8.3A Tape Status Messages • All Wr Protected. A record command cannot be executed, because all ADAT tapes are write protected. • Ejected. A read data command cannot be executed because the tape in the first ADAT machine is ejected or a save data command cannot be executed because all ADAT tapes are ejected. • Reading Tape. ADAT tape header[...]

79 • Wr Protected. A command cannot be executed because the write protect tab has been removed from the tape. 8.3B System Status Messages • ADAT Unavailable. A tape operation has been requested and the ADAT transport is not available. • ADAT Version Err. The AI-2 has detected a version of ADAT software that is earlier than V3.05. This does no[...]

80 • MIDI Read Wait. A read MIDI data operation has been requested and the AI-2 is waiting for data. • MIDI Save. MIDI data is being saved to an external MIDI device. • MIDI Save Abort. An unsuccessful save MIDI data operation has been aborted. • MIDI Save Done. A successful save MIDI data operation has been completed. • No Data. A read o[...]

81 • System Message. System message, followed by error message, warning, condition or number. • PLL Lost Lock. The AI-2 internal hardware phase lock loop has lost lock. • Video = NTSC. Video sync source detected is NTSC. • Video = PAL. Video sync source detected is PAL. • Video Lost Lock. Video sync input has lost lock. • VSG Not Locked[...]

82 8.4 GLOSSARY 24. '24' refers to both the film-standard speed and code type. 25. '25' refers to both the EBU/PAL speed and code type. 29.97. '29.97' refers to a SMPTE frame rate only, in frames-per - second. (See Drop Frame) 30. '30' refers to SMPTE frame rate, in frames-per-second. (See Drop Frame and Non [...]

83 Control Track. A synchronizing signal on the edge of a tape, which provides a reference for tracking control and tape speed. Digital Audio. A means of storing and transmitting sound using binary digits to replicate the audio waveforms. Display. Numeric display. Time Code/Message Display. Drop Frame. Drop frame is one of the two SMPTE code types,[...]

84 musical pitch and rhythm information, synthesizer performance parameters, song position markers, stop/start/continue commands for sequencers and computers, and synchronizing data called MIDI Clock, which is based on 24 pulses per quarter-note. MIDI is frequently used with SMPTE for sync-to-tape functions. MIDI is transmitted between microprocess[...]

85 Resolving. A technique for regulating the play speed of a tape machine by matching the rate of pulses recorded on tape with a pulse rate from another stable source or a master tape machine. Sequencer. A device that can record performance data for synthe- sizers and other electronic instruments and then, on playback, pass that data on to the inst[...]

86 Toggle. To toggle is to consecutively press a key to enable or disable a feature. Type. See Time Code Type. Video Sync. A reference video signal generated by an extremely stable source. This signal is used to control the speed of video machines, digital audio machines and is used as a timing reference to ensure accurate synchronization. Virtual [...]

87 8.5 FCC NOTICE This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide a reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate[...]