OTARI MX-5050 BIII-2E Operation And Maintenance Manual
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OTARI MX-5050 BIII-2E Operation And Maintenance Manual

Mx-5050 series
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MX-5050mkIV-2, BIII-2
Operation and Maintenance Manual
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 The New MX-5050 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Audio Signal Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.1 Audio Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.2 Balanced/Unbalanced Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Switch Position Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 PCB Assembly Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4.1 MX-5050BIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4.2 MX-5050MKIV-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.7 Speed Conversion (BIII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.8 Equalization Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Transport Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4 Amplifier Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5 Audio Connector Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.6 Connector Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 Operation Mode Reference Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1 Transport Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.2 Audio Channel Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Operating the MX-5050 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.1 Placing Reels on the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.2 Threading the Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4 Operation of the Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.1 Playing Back the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.2 Recording the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.3 Sel·Rep Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.4 Fast Wind and Cue Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.5 Tape Editing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.6 Using the Pitch Control Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5 Locator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Master Tape Recorder
Fifth Edition

Table of Contents

4.5.1 Storing Tape Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5.2 Search Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5.3 Search Play Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5.4 Search Zero Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.5.5 Search Start Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.5.6 Repeat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.6 Test Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.1 Maintenance Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2 Demagnetizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3 Cleaning the Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.4 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6. Transport Adjustment and Parts Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1 Transport Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.2 Brake Torque Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.3 Tape Lifter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.5 Pinch Roller Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.6 Tape Speed Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.7 Reel Table Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.8 Head Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.9 Head Position Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7. Audio Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.1 Tools and Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.2 Preliminary Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.2.1 Peak Indicator Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.2.2 Test Oscillator Waveform and Level Adjustment . . . . . . . . . . . . . . . . 45
7.3 Reproduce Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.3.1 Reproduce Head Azimuth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.3.2 Reproduce Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.3.3 Reproduce Equalization Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.4 Record Electronics Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.4.1 Record Bias Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.4.2 Record Head Azimuth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.4.3 Record Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.4.4 Record Equalization Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.4.6 Sel·Rep Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Part No. OS3-298-
Ed5 1999-02 (WM)

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Summary of Contents for OTARI MX-5050 BIII-2E

  • Page 1: Table Of Contents

    2.4.2 MX-5050MKIV-2 ........

  • Page 2: Safety Instructions

    Read Instructions: All safety and operating instructions should be read before operation. All Otari products are manufactured under strict quality control. Each unit is Retain Instructions: The safety and operating instructions should be carefully inspected and tested prior to shipment.

  • Page 3: Introduction

    In addition to the usual tape recorder functions, the MX-5050 series has various additional features. All MX-5050 series tape recorders have the OTARI Standard Parallel I/O connector which allows for post production editing work with a synchronizer using time code. The tape timers include a Mini Locator for more advanced locator functions.
  • Page 4 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Start Time Time required to accelerate to double the specified Wow and Flutter value. 15 ips: max. 0.5 s 7.5 ips: max. 0.4 s 3.75 ips: max. 0.3 s Stop Time Time to stop from Play mode 15 ips: max.
  • Page 5 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Distortion Total Harmonic Distortion max. 0.3% (15 ips 1 kHz, 250 nWb/m, AMPEX 456) Crosstalk MX-5050 BIII-2, MKIV-2: min. 55 dB MX-5050 MKIV-2E, BIII-2E: min. 48 dB Depth of Erasure MX-5050 BIII-F: min. 75 dB MX-5050 BIII-2, MKIV-2: min.

  • Page 6: Installation

    Verify that all items, as listed in the following table, have been received. Do not connect or operate the MX-5050 until this inspection has been completed. When sending the machine back to the local Otari dealer or to Otari, follow the packing directions printed on the carton.

  • Page 7: Audio Signal Connection

    Pin 1 = Shield (GND), Pin 2 = Cold, Pin 3 = Hot. When connecting an unbalanced machine to the MX-5050, change the pin assignment as shown in Figure 2-2. Optional Input (ZA-53T)/Output (ZA-53S) Transformers are available from Otari. For details contact Otari or your nearest Otari dealer. 1 GND...

  • Page 8: Switch Position Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 2.3 Switch Position Adjustment If necessary, change the following switch settings on the rear panel before operating the machine. SW501: MIC. Attenuator (0 dB/-20 dB/OFF) SW502: Ref. Flux H/M/L (320/250/185 nWb/m) SW503: EQ Setting (NAB/IEC)
  • Page 9 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual SW1-1: Speed Version Selection (BIII-2) ON = 3.75/7.5 ips, Low Speed Version (Option) OFF = 15/7.5 ips, High Speed Version The BIII-2 is set to High Speed at the factory. After receiving the BIII-2, it can be changed to Low Speed with this switch.

  • Page 10: Pcb Assembly Location

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 2. PCB Assembly Location 2..1 MX-5050BIII The PCB Assemblies are located as shown in Figure 2-5. The CONTROL PCB Assembly is accessed by removing the rear panel (refer to Figure 2-9). The CONTROL PCB can be rotated to adjust parts on the COMP side.

  • Page 11: Mx-5050Mkiv-2

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 2..2 MX-5050MKIV-2 The AMP section of the MKIV-2 is adjusted after removing the Top Panel. Accessing the AMP Section Turn off the machine. Remove the Top Panel (for MKIV-2). Adjust the PCB Assemblies (REC/REP AMP PCB Assembly) located inside the AMP section.

  • Page 12: Power Connection

    When the AC Line Voltage is different from the factory setting, the Line Voltage connector should be changed to the proper one. In this case, contact Otari or nearest Otari dealer and order the proper Line Voltage connector. The Line Voltage connector (white) is located beside the Supply Reel Motor.

  • Page 13: Fuse Replacement

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 2. Fuse Replacement If a fuse is blown, first check the cause of the blown fuse, then replace the fuse with a new one as follows. CAUTION! For continued protection against fire hazard, replace only with the same type of fuse.

  • Page 14: Speed Conversion (Biii)

    Make all necessary adjustments (Reproduce EQ, SRL, Bias Record EQ, Record Level) referring to the corresponding explanation in Section 7. NOTE: The MX-5050MKIV-2 cannot be changed to Low Speed. 2.8 Equalization Change The Equalization type is set to the customer’s specifications at the factory. The setting can be changed between NAB and IEC by sliding the EQUALIZER switch on the rear panel (☞...

  • Page 15: Controls And Indicators

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 3. Controls and Indicators 3.1 Tape Transport TAPE SPEED TIME-IPS-% SEARCH ZERO REPEAT POWER SPEED MODE PITCH CONTROL SPEED REEL SIZE T.UP EXT FIX VARI DOWN EDIT Figure 3-1 Tape Transport [1] Supply Reel Table [2] Take-up Reel Table The Reel Tables are supplied with reel clamps for 5"...

  • Page 16: Transport Control Panel

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 3.2 Transport Control Panel TAPE SPEED TIME-IPS-% SEARCH ZERO REPEAT POWER SPEED MODE PITCH CONTROL SPEED REEL SIZE T.UP EXT FIX VARI DOWN EDIT 11 10 12 15 1 17 18 19 20 21 TAPE SPEED TIME·IPS·%...
  • Page 17 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual [9] CLR Button Pressing CLR together with the one of the following keys works as follows. CLR + SET: Exits Set mode CLR + TIME·IPS·%: Tape Timer Display resets to zero CLR + SEARCH 1-3: Clears Cue Point Memory...

  • Page 18: Head Assembly

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 3.3 Head Assembly Figure 3-3 Head Assembly [1] Erase Head The Erase Head is made of ferrite. The track width is 2 mm for the MKIV-2 and BIII-2, 2.75 mm for the MKIV-2E and BIII-2E, and 6.3 mm for the BIII-F.

  • Page 19: Amplifier Panel

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 3. Amplifier Panel REF FLUX CH 1 INPUT CH 2 OUTPUT LINE LINE HIGH 1 0 1 1 0 1 PEAK PEAK EQUALIZATION RECORD SEL-REP RECORD BIAS CH1-RECORD EQ-CH2 RECORD LEVEL PHONES TEST OSC CH1-MONITOR-CH2...

  • Page 20: Audio Connector Panel

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 3.5 Audio Connector Panel PARALLEL CH 2 CH 1 CH 2 CH 1 CH 2 CH 1 LINE OUTPUT LINE INPUT INPUT GROUND POWER OUTPUT LEVEL EQUALIZATION REF FLUX MIC ATTENUATOR HIGH HIGH OdB -2OdB OFF...

  • Page 21: Connector Pin Assignment

    This is the auxiliary ground terminal. Connect equipment not connected to the AC earth to this terminal. [9] PARALLEL I/O Connector This is the Otari standard Parallel I/O connector. This 37 pin connector includes ports for Transport Control Command Status Tally Signal and External Capstan Speed Control Signal. For details refer to §3.7.

  • Page 22: Operation

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual . Operation .1 Operation Mode Reference Tables Transport Modes MODE CONTROL EXPLANATION Stop STOP Tape motion stops. Play PLAY Tape moves from Supply to Take-up at the currently selected speed. F.Fwd F.FWD Tape moves from Supply to Take-up at Fast Wind speed.

  • Page 23: Audio Channel Modes

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Record mode To enter Record mode, press RECORD and PLAY when a channel is in Record Ready mode, or if it is selected to do so, press RECORD while the machine is in Play mode. The lamp on the RECORD button will steadily illuminate when the MX-5050 is in Record mode.

  • Page 24: Operating The Mx-5050

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .3 Operating the MX-5050 .3.1 Placing Reels on the Machine Using 5" or 7" EIA Reels Turn the Reel Clamp portion of the Reel Spindle until it lines up with the three Reel Drive Pins on the Reel Table.

  • Page 25: Threading The Tape

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .3.2 Threading the Tape Mount an empty reel on the Take-up side and mount a reel of tape on the Supply side. NOTE: Select the reel diameter by pressing the REEL SIZE T.UP S/L and REEL SIZE SUP S/L buttons after mounting the reels.

  • Page 26: Operation Of The Transport

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual . Operation of the Transport ..1 Playing Back the Tracks Set both Record mode buttons to the SAFE position (not depressed). Press the Monitor button to the TAPE position. Press the PLAY button to start Play mode.

  • Page 27: Sel·rep Recording

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual ..3 Sel·Rep Recording Sel·Rep operation means that the tape is reproduced with the Record Head instead of being reproduced with the Reproduce Head. With this operation, the signal reproduced with the Record head is recorded to the other track without time delay. The following is the procedure of the Sel·Rep operation.

  • Page 28: Tape Editing

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual ..5 Tape Editing Move the tape at the beginning of the edit section. When the tape reaches to the editing point, rotate the reel by hand to accurately locate the editing point, and finally place the editing point to the reproduce head.

  • Page 29: Using The Pitch Control Feature

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .. Using the Pitch Control Feature The speed of the tape can be changed over a range of ±20%as it is being recorded or played. This feature makes it possible to compress or extend material to fit it into a time slot, or to change the pitch for special effects, etc.

  • Page 30: Locator Operation

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .5 Locator Operation The MX-5050 Series tape recorders feature a built-in Auto Locator which has three cue point memories, a zero location memory, and the ability to repeat play between any two selected tape locations.

  • Page 31: Search Zero Mode

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .5. Search Zero Mode To enter Search Zero mode, press the SEARCH ZERO key. The tape will move at Fast Wind speed to the location corresponding to 0:00:00 on the Tape Time display and stop.

  • Page 32: Maintenance

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 5. Maintenance 5.1 Maintenance Scheduling Routine maintenance is necessary to keep the MX-5050 in peak operating condition. The following is a chart for a suggested maintenance schedule. Maintenance Time Table Before Each Every 3 to 6 Adjustment Item Refer to…...

  • Page 33: Cleaning The Tape Path

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Slowly move the tip of the demagnetizer up and down along the arm so that the entire surface is exposed to the demagnetizing field. Do not touch any part of the MX-5050 with the demagnetizer.

  • Page 34: Lubrication

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 5. Lubrication The Capstan Motor in MX-5050 machines utilizes an Oilite bearing at the front end, which requires lubrication. Lubrication should be performed after 1000 hours of operation or after 6 months, whichever comes first.

  • Page 35: Transport Adjustment And Parts Replacement

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual . Transport Adjustment and Parts Replacement .1 Transport Access The PCB Assemblies and main transport parts are located inside the machine. Therefore, to adjust these parts, certain panels must first be removed. Refer to §2.4 for instructions on accessing these parts.
  • Page 36 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Repeat steps 4–6 for a clockwise reading on the supply side. The readings should fall within the range listed in the table below. MX-5050BIII A: 100–125 g (3.6–4.5 ounces) B: 225–275 g (7.9–9.7 ounces) MX-5050MKIV-2 A: 145–175 g (5.1–6.2 ounces)

  • Page 37: Tape Lifter Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .3 Tape Lifter Adjustment Thread the machine with tape. Check the gap between tape and the lifters in Stop mode. If the gap is 1–2 mm, then the following adjustment is not necessary. If the gap is out of this range, then perform the following adjustment.

  • Page 38: Capstan Motor Adjustment And Pitch Control Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual . Capstan Motor Adjustment and Pitch Control Adjustment Open the rear panel by removing the screws on the rear panel. Turn on the machine, and load the tape on the machine. Make sure that the Tape Speed mode is set to the FIX.

  • Page 39: Pinch Roller Pressure Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .5 Pinch Roller Pressure Adjustment The pinch roller pressure against the capstan shaft is determined by the pinch roller solenoid spring. The pinch roller solenoid spring is adjusted with a nut as shown in Figure 6-5.
  • Page 40 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual MX-5050MKIV-2 Remove the pinch roller cap screw and the roller cap. Thread a hex socket head screw (M3, length 25–30 mm) into the pinch roller. Press the EDIT button and then press the PLAY button. The pinch roller will move to make contact with the capstan and both will rotate.

  • Page 41: Tape Speed Adjustment

    NOTE: A special tape is required for this procedure. If an accurate speed tape is not available, please contact your Otari dealer for further information. Follow the procedure below to measure and adjust the tape speed.

  • Page 42: Reel Table Height Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .7 Reel Table Height Adjustment The Reel Table may be detached from the machine by removing the three cross-recessed screws accessible from the side of the transport. Remove the side panel by removing the screws on the panel.

  • Page 43: Head Assembly Replacement

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .8 Head Assembly Replacement The Head Assembly is mounted on the tape guide posts and is attached to the Guide Posts with screws marked “M” (refer to Figure 6-9). Each Head Stack is attached to the Head Bracket with screws marked “W,”...

  • Page 44: Head Position Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual .9 Head Position Adjustment Whenever replacing a head, the following head position adjustments are necessary. If the tape does not contact the heads properly, perform the following adjustments. NOTE: If the tape does not contact the heads properly due to improper alignment, any one of the following problems may occur.
  • Page 45 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual ■ Wrap Adjustment While reproducing 8 kHz portion of the Low Speed Test Tape, apply pressure with a cotton swab to the left side of the head. Observe the level change. If the level increases by more than 0.5 dB, wrap adjustment is necessary.

  • Page 46: Audio Alignment

    COM. REC ERASE BIAS ADJ REC SEL 7.1 Tools and Equipment Required • Alignment Tapes suitable for the tape speed most often used. Otari recommends the following Alignment Tapes. Tape Speed Flux Level MRL* Catalog No. 250 nWb/m 21J205 (NAB)

  • Page 47: Preliminary Adjustments

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7.2 Preliminary Adjustments These adjustments are performed when first receiving the machine, and then again only when an audio component, such as the Heads, is replaced. 7.2.1 Peak Indicator Level Adjustment NOTE: The PEAK indicator is factory preset to illuminate at a level equivalent to 1040 nWb/ m, which corresponds to approximately 3% THD.
  • Page 48 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual MONITOR TEST OSC REC. LEVEL REC. EQ BIAS SEL•REP VR106 VR208 VR108 MIC AMP VR206 REC EQ VR205 REC.EQ REP.AMP LINE OUT BIAS OSC SW201 LINE OUT VR105 LINE AMP SW101 REP.AMP VR501 TEST OSC SEL•REP AMP...

  • Page 49: Reproduce Adjustments

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7.3 Reproduce Adjustments 7.3.1 Reproduce Head Azimuth Adjustment Turn off the power to the machine. Clean and demagnetize the Heads, Lifters, and Tape Guides. Turn on the power to the machine. Thread the machine with a 7.5 ips Reproduce Alignment Tape.

  • Page 50: Reproduce Level Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7.3.2 Reproduce Level Adjustment Perform the following adjustment at the speed most often used. Thread the machine with the Reproduce Alignment Tape (refer to §7.1). Press down the both Monitor buttons to TAPE position. Connect the AC Voltmeter to the CH 1 OUTPUT connector.

  • Page 51: Record Electronics Adjustments

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7. Record Electronics Adjustments 7..1 Record Bias Level Adjustment Thread the machine with the tape normally used for sessions. Press down the RECORD READY button to the READY position and set the Monitor button to SOURCE position. Set the SPEED HI/LO switch to the Hi position.

  • Page 52: Record Head Azimuth Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7..2 Record Head Azimuth Adjustment Thread the machine with a reel of blank tape. Set both Record Ready buttons to the READY position and set both Monitor buttons to TAPE position. Connect an external oscillator to the CH 1 and CH 2 INPUT connectors.

  • Page 53: Record Level Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7..3 Record Level Adjustment Thread the machine with tape and set the SPEED Select Switches for the Tape Speed most often used. Set both RECORD READY buttons to the READY position. Set both Monitor button to TAPE position.

  • Page 54: Low Frequency Reproduce Equalization Adjustment

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual 7..5 Low Frequency Reproduce Equalization Adjustment Thread a blank tape on the machine. Connect the external oscillator to the CH1 and CH2 input connectors. Set the Monitor button to SOURCE position. Confirm that the VU meters indicate 0 VU.

  • Page 55: Appendix

    MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Appendix Troubleshooting Hints (Transport) Power is not being supplied to machine VU meter lamp does not illuminate Main fuse is blown Tape is threaded incorrectly Play, F.FWD, RWD modes do not work Tension Arm with safety...
  • Page 56 MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual Troubleshooting Hints (Electronics) Reproduce head is defective Set to SEL-REP and check if machine reproduces Reproduce amp is defective Reproduce amp is defective Set to INPUT and Machine does not check if input signal reproduce tape...

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