Sennheiser MKH 20 Service Manual
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Sennheiser MKH 20 Service Manual

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MKH 20...70
SA 050418
MKH 20
MKH 30
MKH 40
MKH 50
MKH 60
MKH 70
Sennheiser electronic GmbH & Co. KG • 30900 Wedemark
1/53
Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300

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  • Page 1 MKH 20...70 SA 050418 MKH 20 MKH 30 MKH 40 MKH 50 MKH 60 MKH 70 Sennheiser electronic GmbH & Co. KG • 30900 Wedemark 1/53 Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300...

  • Page 2: Mkh 20

    It is forbidden to alter the product unauthorized. If not observed the adaptor is legally liable for possible results of damage. repairs/exchanges The following instructions for overhaul and testing must be followed. In case of unusual problems please contact your Sennheiser distributor. MKH 20...70 2/53 04/2005...

  • Page 3: Table Of Contents

    Controls......................12 Technical data ....................12 Exploded view ....................14 Schematic representations ................ 15 MKH 20, solder side ......................15 MKH 20, component side ....................15 MKH 20, circuit diagram ....................16 MKH 30 P 48..................17 Brief description ..................17 Features ......................
  • Page 4 MKH 70, solder side......................50 MKH 70, component side ....................50 MKH 70, circuit diagram ....................51 MKH 70, component side, new..................52 MKH 70, solder side, new ....................52 MKH 70, circuit diagram, new ..................53 MKH 20...70 4/53 04/2005...

  • Page 5: Description

    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.
  • Page 6 2mA by T2 (or Q2), R3, R4, and R5 (constant-current circuit). The NTC resistor R5 stabilizes against temperature influences. R2 ensures a sufficiently high collector voltage of T2 (or Q2), since the base-emitter voltage of T1 (or Q1) is negative (Class C mode). MKH 20...70 6/53 04/2005...
  • Page 7 C14 and C16. This increases the available AC output current, enhances the linearity, and reduces the background noise. The base voltage divider R15, R16, R17, D3 determines the operating voltage and stabilizes it against temperature influences. MKH 20...70 04/2005 7/53...
  • Page 8 Since the operating current is stabilized by the oscillator circuit, the AC side of the amplifier circuit is decoupled from ground ("electronic choke") and the available output signal is floating. The signal is balanced by means of the two supply resistors (6.8kΩ each) of the phantom supply source. MKH 20...70 8/53 04/2005...

  • Page 9: Test Instructions

    If the value is not 0V, rotate the coil core of L1 until the voltage is 0V. ¿ Operating voltages output stage: Check voltage via D6; desired value = 9V Check voltage via D8; desired value = 8V ´ Operating voltage oscillator: Check voltage via C4; desired value = +28.5V MKH 20...70 04/2005 9/53...
  • Page 10 If the value is not 0V, rotate the coil core of L1 until the voltage is 0V. ¿ Operating voltage output stage: Check voltage via D4; desired value = 4.5V Check voltage via D5; desired value = 4.5V ´ Operating voltage oscillator: Check voltage via C10; desired value = +30.5V MKH 20...70 10/53 04/2005...

  • Page 11: Mkh 20 P 48

    MKH 20 P 48 SA 050418 MKH 20 P 48 Brief description The MKH 20 P 48 is a high-frequency condenser microphone with omnidirectional characteristic. Features • Very low noise for highly dynamical recordings • Distortion-free transmission of sound pressures of up to 142dB •...

  • Page 12: Controls

    Supply voltage _______________________ 48V ±4V Supply current _______________________ 2mA Dimensions (in mm)___________________ 25 ∅ x 150 Weight _____________________________ approx. 100g Scope of delivery _____________________ 1 microphone MKH 20 P 48, 1 floorstand clamp MZQ 40, 1 close-talking and wind protection MZW 41...
  • Page 13 Frequency response Wirkung der Diffusfeldkorrektur diffuse-field correction activated Polar diagram MKH 20 P 48 04/2005 13/53...

  • Page 14: Exploded View

    Chassis complete Countersunk screw M2x3 Condenser capsule KS20 Type plate MKH20 Brace 013 014 IC mounting DIL6 S001 Plate O ring 18x1 (for condenser capsule version 2) S002 Slide switch S001 Slide switch S002 MKH 20 P 48 14/53 04/2005...

  • Page 15: Schematic Representations

    Schematic representations MKH 20 P 48 04/2005 15/53...

  • Page 16: Mkh 20, Circuit Diagram

    MKH 20 P 48 16/53 04/2005...

  • Page 17: Mkh 30 P 48

    Distortion-free transmission of sound pressures of up to 142dB • Transmission range 40 to 20000Hz • Balanced transformer-free signal decoupling • Switchable roll-off filter • Switchable pre-attenuation Sennheiser electronic GmbH & Co. KG • 30900 Wedemark 17/53 Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300...

  • Page 18: Controls

    Controls roll-off filter M K H 3 0 P 4 8 MKH 30 P 48 pre-attenuation (10dB) Technical Data The values in parentheses apply to activated pre-attenuation (-10dB) Acoustic principle _____________________ Pressure gradient receiver Directional characteristic _______________ bidirectional Transmission range ___________________ 40 to 20000Hz Free-field no-load transmission factor at 1kHz ____________________________ 25mV/Pa (8mV/Pa) = -32dBV (-42dBV)
  • Page 19 Frequency response Wirkung der schaltbaren Tiefendämpfung bass roll-off activated Polar diagram MKH 30 P 48 04/2005 19/53...

  • Page 20: Exploded View

    Exploded view Designation Sound inlet complete with gauze Condenser capsule KS30 Thread ring Housing MKH30 Countersunk screw hexagon socket M2.5x4 Countersunk screw M2x3 Chassis complete Brace Connecting shell for XLR3 Metal screw ST2.2x6.5 Type plate MKH30 IC mounting DIL6 Plate Easy release clamp Thread insert O ring 18x1...

  • Page 21: Schematic Representations

    Schematic representations MKH 30 P 48 04/2005 21/53...

  • Page 22: Mkh 30, Circuit Diagram

    MKH 30 P 48 22/53 04/2005...

  • Page 23: Mkh 40 P 48

    Largely frequency-independent directional characteristic • Broad transmission range • Balanced transformer-free signal decoupling • Switchable roll-off filter • Switchable pre-attenuation Sennheiser electronic GmbH & Co. KG • 30900 Wedemark 23/53 Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300...

  • Page 24: Controls

    Controls roll-off filter MKH 40 P 48 MKH 40 P 48 pre-attenuation (10dB) Technical Data The values in parentheses apply to activated pre-attenuation (-10dB) Acoustic principle _____________________ Pressure gradient receiver Directional characteristic _______________ cardioid Transmission range ___________________ 40 to 20000Hz Free-field no-load transmission factor at 1kHz ____________________________ 25mV/Pa (8mV/Pa) = -32dBV (-42dBV)
  • Page 25 Frequency response Wirkung der schaltbaren Tiefendämpfung bass roll-off activated Polar diagram MKH 40 P 48 04/2005 25/53...

  • Page 26: Exploded View

    Exploded view Designation Easy release clamp Thread insert Countersunk screw hexagon socket M2.5x4 Housing MKH40 Damping silk Type plate MKH40 Metal screw ST2.2x6.5 Connecting shell for XLR3 Chassis complete Countersunk screw M2x3 S001 Condenser capsule KS40 Brace IC mounting DIL6 S002 Plate O ring 18x1...

  • Page 27: Schematic Representations

    Schematic representations MKH 40 P 48 04/2005 27/53...

  • Page 28: Mkh 40, Circuit Diagram

    MKH 40 P 48 28/53 04/2005...
  • Page 29 Largely frequency-independent directional characteristic • Broad transmission range • Balanced transformer-free signal decoupling • Switchable roll-off filter • Switchable pre-attenuation Sennheiser electronic GmbH & Co. KG • 30900 Wedemark 29/53 Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300...
  • Page 30 Controls roll-off filter pre-attenuation (10dB) Technical Data The values in parentheses apply to activated pre-attenuation (-10dB) Acoustic principle _____________________ Pressure gradient receiver Directional characteristic _______________ hyper-cardioid Transmission range ___________________ 40 to 20000Hz Free-field no-load transmission factor at 1kHz ____________________________ 25mV/Pa (8mV/Pa) = -32dBV (-42dBV) Equivalent sound pressure level according to DIN 45500, curve A_____ 12dB (18dB)
  • Page 31 Frequency response Equalization Polar diagram MKH 50 P 48 04/2005 31/53...
  • Page 32 Exploded view Designation Sound inlet complete with gauze Condenser capsule KS50 Thread ring Damping silk Dust protection Housing MKH50 Countersunk screw hexagon socket M2.5x4 Countersunk screw M2x3 Chassis complete Brace Connecting shell for XLR3 Metal screw ST2.2x6.5 Type plate MKH50 IC mounting DIL6 Plate Easy release clamp...
  • Page 33 Schematic representations MKH 50 P 48 04/2005 33/53...
  • Page 34 MKH 50 P 48 34/53 04/2005...
  • Page 35 Low noise for highly dynamical recordings • Uniform directional characteristic • Broad transmission range • Switchable pre-attenuation (-10dB) • Switchable filters (roll-off and presence) Sennheiser electronic GmbH & Co. KG • 30900 Wedemark 35/53 Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300...
  • Page 36 Controls roll-off filter presence filter switch for 10dB sensitivity reduction Technical Data The values in parentheses apply to activated pre-attenuation (-10dB) Acoustic principle _____________________ Pressure gradient/ interference receiver Directional characteristic _______________ hyper-cardioid/lobe Transmission range ___________________ 50 to 20000Hz Free-field no-load transmission factor at 1kHz ____________________________ 40mV/Pa (12.5mV/Pa) Equivalent sound pressure level according to DIN 45500, curve A_____ 9dB (16dB)
  • Page 37 Frequency response Equalization Polar diagram MKH 60-1 P 48 04/2005 37/53...
  • Page 38 Exploded view S002 S001 S003 MKH 60-1 P 48 38/53 04/2005...
  • Page 39 Designation Sound inlet MKH60/70 Ring Gauze tube MKH60 Countersunk screw M1.4x3 Tube complete Condenser capsule KS60 Countersunk screw M2x3 Chassis with PCB MKH60-1 Brace Connecting shell for XLR3 Cheese head screw M2x5 Type plate MKH60-1 Housing MKH60 Countersunk screw hexagon socket M2.5x4 O ring 18x1 PCB assembly MKH60 Base for IC...
  • Page 40 Schematic representations MKH 60-1 P 48 40/53 04/2005...
  • Page 41 MKH 60-1 P 48 04/2005 41/53...
  • Page 42 MKH 60-1 P 48 42/53 04/2005...
  • Page 43 MKH 60-1 P 48 04/2005 43/53...
  • Page 44 MKH 60-1 P 48 44/53 04/2005...
  • Page 45 Low noise for highly dynamical recordings • Uniform directional characteristic • Broad transmission range • Switchable pre-attenuation (-10dB) • Switchable filters (roll-off and presence) Sennheiser electronic GmbH & Co. KG • 30900 Wedemark 45/53 Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300...
  • Page 46 Controls roll-off filter presence filter switch for 10dB sensitivity reduction Technical Data The values in parentheses apply to activated pre-attenuation (-10dB) Acoustic principle _____________________ Pressure gradient/ ______________________________ interference receiver Directional characteristic _______________ hyper-cardioid/lobe Transmission range ___________________ 50 to 20000Hz Free-field no-load transmission factor at 1kHz50mV/Pa (15mV/Pa) ______________________________ = -28dBV (-38dBV) Equivalent sound pressure level according to DIN 45500, curve A...
  • Page 47 Frequency response Equalization Polar diagram MKH 70-1 P 48 04/2005 47/53...
  • Page 48 Exploded view S002 S001 S003 MKH 70-1 P 48 48/53 04/2005...
  • Page 49 Designation Sound inlet MKH60/70 Ring Gauze tube MKH70 Countersunk screw M1.4x3 DIN 963 Tube complete Condenser capsule complete with gauze tube Countersunk screw M2x3 Chassis with PCB MKH70-1 Brace Connecting shell for XLR3 Cheese head screw M2x5 Type plate MKH70-1 Housing MKH70 Countersunk screw hexagon socket M2.5x4 O ring 18x1...
  • Page 50 Schematic representations MKH 70-1 P 48 50/53 04/2005...
  • Page 51 MKH 70-1 P 48 04/2005 51/53...
  • Page 52 MKH 70-1 P 48 52/53 04/2005...
  • Page 53 MKH 70-1 P 48 04/2005 53/53...

This manual is also suitable for:

Mkh 30Mkh 40Mkh 50Mkh 60Mkh 70

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