Maico MA 1 Service Manual
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Maico MA 1 Service Manual

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Service Manual
MA 1
Revision date March 27, 2023
Index 23/03

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Summary of Contents for Maico MA 1

  • Page 1 Service Manual MA 1 Revision date March 27, 2023 Index 23/03...
  • Page 2 Service Manual MA 1 8531480 Rev. 1 07/12/2021...

  • Page 3: Table Of Contents

    Service Manual MA 1 Table of Contents 1 General technical specification ................1 1.1 Front and Back Panel ..................1 1.2 Product specification ..................2 2 Service equipment requirements (Class 1) ............4 3 Safety Regulations ....................5 3.1 Important Safety Note ..................5 3.2 Measuring security .....................

  • Page 4: General Technical Specification

    Service Manual MA 1 1 General Technical Specification 1.1 Front and Back Panel Figure 2 Figure 1 Explanation of Front Panel Symbol Function Centre button (black colour) Power on. Ear selection. (Left/Right) LED (red circle) Indication of signal being presented in the right ear.

  • Page 5: Product Specification

    IEC 60601-1:2005 + Cor. :2006 + Cor. :2007 + A1:2012 Safety Standards Internally powered, Type B Applied Parts EMC Standard IEC 60601-1-2:2014 The MA 1 is not classified according to the standard EN 60645-1 and is not in conformity with this standard. DEVICE SPECIFICATIONS Mode of Operation Continuous...
  • Page 6 Service Manual MA 1 Outputs Left, Right Stimuli Presentation Manual, continuous Intensity AC: 15 dB HL to 50 dB HL Frequency range 500 Hz to 4000 Hz Weight 952,5 g/2.1 lbs with accessories and carry case. Dimensions 6.35 x 15.24 x 2.22 cm / 2.5 x 6 x 7/8 inches...

  • Page 7: Service Equipment Requirements (Class 1)

    Service Manual MA 1 2 Service Equipment Requirements (Class 1) • High impedance floating voltmeter • Ohmmeter • Signal distortion analyzer • Signal analyzer • Oscilloscope • Audio range frequency counter • Artificial ear IEC 60318-3 (for DD 45) • Artificial ear IEC 60318-1 (for DD65 V2) •...

  • Page 8: Safety Regulations

    MA 1. Therefore, the operation of these instruments in close proximity to the MA 1 should be avoided at all times. The examination room should have a normal temperature between 15˚C/ 59˚F and 35˚C/ 95˚F. If the instrument has cooled down during transportation, please wait for it to warm up to room temperature before operation.

  • Page 9: Device Control

    Service Manual MA 1 3.3 Device Control The user of the instrument should perform a subjective instrument inspection once a week. 8531480 Rev. 2 27/03/2023...

  • Page 10: Antistatic Procedure

    Service Manual MA 1 4 Antistatic Procedure All circuit board subassemblies used in the MA 1, contain CMOS and NMOS devices, and are therefore susceptible to degradation or destruction from electrostatic discharge. Movements, such as walking across the floor or sitting on a chair, generate sufficient movement to create a charge capable of destroying these components.

  • Page 11: Service Calibration And Hardware Adjustments

    Service Manual MA 1 5 Service calibration and hardware adjustments Access to the MA 1 calibration mode is only available for authorized service partners. Remember to always perform customer hardware adjustments before starting the calibration process! The Warm-up time. The performance requirements shall be met after the stated warm-up time has elapsed and after any setting up adjustments have been carried out in accordance with the MAICO instructions.
  • Page 12 Service Manual MA 1 Step 4. Remove the board from inside the top housing. (Figure 5) Figure 5 Note: Don´t disconnect the Battery connects from the top housing. (Figure 6) Figure 6 8531480 Rev. 2 27/03/2023...

  • Page 13: Transducer Calibration

    For calibration, please use the calibrations table for your measuring system. 1) Connect the right earphone to the MA 1 and the sound level meter. 2) Turn on the MA 1 device. 3) Activate the MA 1 right channel.
  • Page 14 Service Manual MA 1 50 dB 4 kHz 2 kHz R4 / 500Hz R3 / 1kHz 1 kHz R2 / 2kHz R1 / 4kHz 500 Hz Figure 7 8531480 Rev. 2 27/03/2023...

  • Page 15: Calibration Values And Maximum Levels

    Once calibration is complete, it is essential to check the calibrated values in the user mode of the MA 1 by using the values in the charts above. Verify that the receiver has the correct functionality and always check both sides of the headphones.

  • Page 16: History

    Service Manual MA 1 7 History Date Changes Valid for 2011January First draft MA 1 2021December DD65v2 added, whole document was updated 2023 March New pictures MA 1 (with circles around LEDs, Updated Technical Data 8531480 Rev. 2 27/03/2023...
  • Page 17 MAICO Diagnostics GmbH Sickingenstr. 70-71 10553 Berlin Germany Tel.: + 49 30 / 70 71 46-50 Fax: + 49 30 / 70 71 46-99 E-mail: sales@maico.biz Internet: www.maico.biz Technical information: www.maico.biz Technical Service Information (SINF) and Software downloads for authorized service partners only: Select Service in the menu bar on the website and choose your COUNTRY.

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