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MKH 20...70
04/2005
Description
Contents of these Service Instructions
These Service Instructions summarize the technical documentation on the
microphones MKH 20 to MKH 70. Information concerning all models is given first,
followed by detailed data on individual microphones.
Service concept
Tests and checks for faults are divided into 3 parts:
1. Acoustic test
2. Capsule check
3. Test instructions
General service information
In the event of a service incident, perform a general functional check, first. For this
purpose, connect the microphone to an amplifier under field conditions and
monitor the microphone using headphones. Speak into the microphone, shake the
microphone, and move the connection cable.
In most cases, this acoustic test will give you a first impression of the kind of fault
that occurred. Perform all subsequent testing and measuring measures according
to the following test instructions.
Checking the microphone capsule
To check the microphone capsule, disassemble the microphone, first.
For the MKH 60 and the MKH 70, unscrew the sound inlet, first.
Loosen the two countersunk head screws on the housing and then use the XLR con-
nector pins to carefully press out the frame together with the capsule. To further
disassemble the microphone, loosen the three screws on the capsule and then pull
off the capsule.
Attention!
Before you touch the connections 1 and 3, touch the capsule housing to avoid
damage due to electrostatic discharge. When connecting measuring equipment,
always establish the connection to the capsule housing (pin 2) first.
Checking the capacitance
Capsule connections (bottom view):
Use a capacitance meter to measure the capsule capacitance.
Type 1; KS 20, 30, 40, 50
Capacitance: 40 to 45pF
Type 2; KS 60, 70
Capacitance: 30 to 35pF
Checking the insulation
Capsule connections (bottom view):
Use a multimeter (20M
Ω
range) to measure the capsule resistance.
R
>
20M
Ω
(out of range)
1
2
3
1
2
3
Summary of Contents for MKH 20
Page 16: ...MKH 20 P 48 16 53 04 2005 MKH 20 circuit diagram ...
Page 22: ...MKH 30 P 48 22 53 04 2005 MKH 30 circuit diagram ...
Page 28: ...MKH 40 P 48 28 53 04 2005 MKH 40 circuit diagram ...
Page 31: ...MKH 50 P 48 04 2005 31 53 Frequency response Equalization Polar diagram ...
Page 34: ...MKH 50 P 48 34 53 04 2005 MKH 50 circuit diagram ...
Page 37: ...MKH 60 1 P 48 04 2005 37 53 Frequency response Equalization Polar diagram ...
Page 41: ...MKH 60 1 P 48 04 2005 41 53 MKH 60 circuit diagram ...
Page 44: ...MKH 60 1 P 48 44 53 04 2005 ...
Page 47: ...MKH 70 1 P 48 04 2005 47 53 Frequency response Equalization Polar diagram ...