Service Manual MA 42
D-0125965 Rev. D
10
18/05/2022
2.2 Connections
In order to ensure that the device works properly, it has to be checked and calibrated at
least once every twelve months.
Figure 7
Table 7 Connections on Backside
CONNECTIONS
No
Connection socket
Specification
1
On/Off
Power Switch
2
Power Supply
External Power 12V 2A (12V)
Model UES24LCP-120200SPA
3
USB 2.0 A Host
4
USB 2.0 B Device
5
Patient Response Switch
2 kΩ 3.3V DC
6
Talk Back Microphone
Input impedance
Min. input level 0 VU
Max. input level 0 VU
3.4 k
Ω
212 µVrms 1 kHz
6.6 mVrms 1 kHz
7
Mic (Microphone)
Input impedance
Min. input level 0 VU
Max. input level 0 VU
3.4 k
Ω
212 µVrms 1 kHz
6.6 mVrms 1 kHz
8
Monitor Phone
Max voltage level
Load impedance
2.4 Vrms
4
Ω or higher
9
AUX Input
Input impedance
Min. input level 0 VU
Max. input level 0 VU
47 k
Ω
16 mVrms 1 kHz
500 mVrms 1 kHz
10 Speaker Left Line
Max. voltage level
Load impedance
3 Vrms
2 k
Ω or higher
11 Speaker Right Line
Max. voltage level
Load impedance
3 Vrms
2 k
Ω or higher
12 Bone (Bone Conductor)
Max. voltage level
Load impedance
6 Vrms
3.3
Ω or higher
13 Insert Phone Left
Max. voltage level
Load impedance
3 Vrms
10
Ω or higher
14 Insert Phone Right
Max. voltage level
Load impedance
3 Vrms
10
Ω or higher
15 Phone Left (Headphone)
Max. voltage level
Load impedance
3 Vrms
10
Ω or higher
16 Phone Right (Headphone)
Max. voltage level
Load impedance
3 Vrms
10
Ω or higher
11
13
14
16
15
12
9
10
8
7
6
5
4
2
1
3
