Maico MA 42 User manual

MA 42
Service Manual

Service Manual MA 42
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Table of Contents
Introduction...............................................................................................................2
1.1 About this Manual.....................................................................................................2
1.2 About warnings and cautions ...................................................................................2
1.3 General information..................................................................................................2
MA 42 Control Panel .................................................................................................3
2.1 Display and Control Panel........................................................................................3
2.2 Connections...........................................................................................................10
2.3 Pin Assigment ........................................................................................................11
2.4 Setup in a Sound Booth..........................................................................................12
2.5 Establishing a Connection to a PC, Printer or an External Audio Device ................13
Maintenance, Cleaning and Disinfection...............................................................14
3.1 Maintenance...........................................................................................................14
3.2 Cleaning and Disinfection Recommendations ........................................................14
Service and Calibration...........................................................................................15
4.1 Service, Adjustment and Repair.............................................................................15
4.2 Software Calibration...............................................................................................16
Disassembly ............................................................................................................28
Technical Data.........................................................................................................37
6.1 MA 42 Hardware ....................................................................................................37
6.2 Calibration Values and Maximum Levels................................................................42
Spare Parts..............................................................................................................52
History......................................................................................................................58

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Introduction
1.1 About this Manual
This manual is for our diagnostic audiometer. The contents of the manual cover
instrument related data, such as disassembly and calibration. Technical specifications,
along with the parts & accessories list, can be found as appendices in the back of the
manual.
1.2 About warnings and cautions
The warnings and cautions below are applied throughout the manual, indicating the level
of attention required for a given action:
The WARNING label identifies conditions or practices that may
present danger to the patient and/or user.
The CAUTION label identifies conditions or practices that could
result in damage to the equipment
NOTE: Notes help you identify areas of possible confusion and avoid potential problems
duringsystem operation.
1.3 General information
We continuously strive to improve our products and their performance, hence the
specifications in this service manual are subject to change without further notice.
The performance and specifications of our products can only be guaranteed if technical
maintenance is conducted routinely every year. Technical maintenance should be carried
out by qualified personnel authorized by MAICO. We refer to the thoroughly described
calibration procedure in this service manual.
We are happy to receive any inquiries about our products. Our contact details are:
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: [email protected]
Internet: www.maico.biz
MAICO Diagnostics
10393 West 70th St
Eden Prairie, MN 55344
USA
Tel.: [phone]
E-Mail: [email protected]m
WARNING
CAUTION

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MA 42 Control Panel
2.1 Display and Control Panel
The main functions of the MA 42 are directly accessible by using the function keys which
are located around the display.
Some of the function keys behave differently depending on how long they are pressed:
Quick Select
Press briefly
Selects directly
e.g.
Advanced Select
Press and hold for 2 s
opens selection menu
with all options shown
e.g.
Figure 1 and 2 show the Display and the Control Panel of the MA42.
NOTE: Buttons that have a filled arrow displayed (i.e., ▲, ►), indicate Advanced Select
is available.
Figure 1

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Figure 2
Table 1 Operating Elements
No.
Key
Information
1
Control Dial
to select (hearing level, test, setting).
2
key
to present/interrupt signal or noise (hearing level) or confirm
selection (test, setting)
3
Skeys
to store single results.
Press for 2 s to store a No Response result.
4
+keys
Tone test: to change to a higher frequency.
SRT test (Wave only): to select the next word.
WRS test: to enter a correct answer.
5
-keys
Tone test: to change to a lower frequency.
SRT test (Wave only): to select the previous word.
WRS test: to enter a wrong answer.
6
Data
Management
Table 2
Data Management
7
Navigation
Table 3
Navigation
8
Test Setup keys
Table 4
Test Setup
9
Selection keys
Table 5
Selection Keys
10
STIM keys
Table 6
STIM/TALK Key and STIM/Monitor Key
11
Numerical
Display
12
Microphone
Buit-in microphone
1
2
2
1
9
3
3
4
4
5
5
8
6
7
10
10
11
12

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Table 2 Data Management
Symbol
Select
Function
Quick Select
to print test report to the default printer.
Advanced
Select
to print test report to the selected printer ( : PDF, :
thermal printer).
Quick Select
to delete all stored results and create a new session.
Advanced
Select
to delete all stored results and create a new session or
to erase last stored value .
If more than 1 value has been stored before a Delete point
window opens. Delete a value using the Control Dial and
the key.
Table 3 Navigation
Symbol
Select
Function
Quick Select
to open the Special Test Menu (Figure 4). Select a special
test using the Control Dial and the key.
Figure 3
Advanced
Select
and press to open the Settings Menu.
Quick Select
to open the Speech Test List.
NOTE: This icon is only shown if wave files are used for
Speech Audiometry.
Advanced
Select
and press to open the Settings Menu OR
press to enter the Special Test Menu.
to switch beween Speech and Tone test.

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Table 4 Test Setup
Symbol
Select
Function
Quick
Select
to change ears (left ↔right channel).
Advanced
Select
to select ear for the left OR right channel. Selection for the
other channel stays the same.
NOTE: This function can be useful if you want to apply
Signal(ToneorSpeech Input)ANDNoisetothesameear.
Tone:
HL
MCL
UCL
Aided
to select the test type.
NOTE: If you want to use the Aided function, you must
first select Speaker as the transducer. Otherwise the
function is grayed out.
Quick
Select
to change Tone and Noise (left ↔right channel).
Advanced
Select
to select Tone or Noise for the left OR right channel
only. The selection of the other channel will not change.
NOTE: This function can be useful if you want to apply the
same stimulus to both ears (binaural presentation).
Speech:
SRT
WRS
MCL
UCL
to select the test type.
Quick
Select
to change Speech Input and Noise (left ↔right channel).
Advanced
Select
to select the Speech Input:
•microphone
•auxiliary 1/2 e.g. CD channel 1/2
•wave channel 1/ 2 or
•Noise
for the left OR right channel only. Theselection of the other
channel will not change.
NOTE: This function can be useful if you want to apply the
same stimulus to both ears (binaural presentation).

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Symbol
Select
Function
Freiburger Speech Test:
Numbers
Words
MCL
UCL
Quick
Select
to select the test type.
Quick
Select
to change Wave Input and Noise (left ↔right channel).
Advanced
Select
to select Wave Input for binaural presentation.
Table 5 Selection Keys
Selection
Function
Transducer
to select the transducer for the left and the right ear (only calibrated
transducers can be selected). Select:
Phones
to select headphones (AC).
Insert
to select insert phones or high frequency headphones (AC).
Bone
to select bone conductor (BC).
NOTE: If you select Bone for one ear, the default or bone
masking transducer is automatically selected for the other
ear. By press and hold for 2 s the opposite transducer can be
changed between Phone and Insert.
Speaker
to select loudspeaker for sound field testing.
NOTE: For specific transducer setup see:
Section 5.11.2
Device Information –Transducers
Tone Type
Steady
to select a steady stimulus.
Pulse
to select pulse stimulus.
Warble
to select warble stimulus.
P & W
to select combined pulse and warble stimulus.
Lock/Track
Function
to select Lock/Track functions. Select:
Unlock
to use neither the Lock nor the Track function.
Lock
to lock the presentation of the signal in both channels.
Track
to automatically increase and decrease channel 1 and 2
levels with the rotation of only one Control Dial.
L & T
to combine Lock and Track function to assist with binaural
testing or masking.

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Table 6 STIM/TALK Key and STIM/Monitor Key
Key
Select
Function
STIM
Talk
Quick Select
STIM: toswitchbetweenPresenter andInterruptermode.
Advanced
Select
Talk:to open the Communication widget (Figure 5)
Figure 4
Talk Forward: Allows tester to provide instruction to the
patient while the headphones are in place.
Increase/decrease the volume by using the Control dial
and the key. The lighted bar/VU meter allows the
examiner to monitor their voice for optimal sound quality.
When speaking, 0is the optimal level.
Talk Back: Allows you to hear the patient through the
internal speaker or monitor headset via an optional talk
back microphone. Increase/decrease the volume or set
the function off by using the Control dial and the key.
The volume dial on the monitor headset must also be
controlled for optimal volume.
Press STIM to close the widget again.
STIM
Monitor
Quick Select
STIM: to switch between Presenter and Interrupter mode.
Advanced
Select
Tone Test:
Monitor: to open the Monitor widget (Figure 6).
Figure 5
Allows you to hear the Tone and Noise stimuli through the
internal speaker or monitor headset. Increase/decrease the
volume or set the function off by using the Control dial and
the Key. The volume dial on the monitor headset must
also be controlled for optimal volume.

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Key
Select
Function
Speech Test:
Monitor: to open the Monitor/Input Calibration widget
(Figure 7).
Figure 6
Monitor: Allows you to hear the Speech Input and Noise
stimuli through the internal speaker or monitor headset via
an optional talk back microphone. Increase/decrease the
volume or set the function off by using the Control dial
and the Key. The volume dial on the monitor headset
must also be controlled for optimal volume.
Input Calibration: Allows you to calibrate the selected
input signal by using the Control dial and the Key.
The optimal level is between -3 and 0 (green area).
Press Monitor to close the widget again.