Sony ECM-939LT User Manual

GENERAL
Type:
FET:
Mercury Battery:
Microphone Output
Terminal:
Dimensions:
Weight:
Finish:
PERFORMANCE
Directivity:
Frequency Response:
Output Impedance:
Output Level
(deviation + 3dB):
Power Requirements:
MICROFILM
SPECIFICATIONS
Electret condenser microphone
(with back-electret condenser)
Junction FET x 2
EVEREADY No. EPX675
Two Way Plug
16x 121mm
21/,, x 47/, inches
120g, 4.2 oz (including battery)
Silver Alumite
Uni-directional
70 Hz to 15,000 Hz
Low impedance unbalanced
Open circuit voltage*:
-70.0 dB (0.32 mV) ,
*0 dB =1 mW/10yubar at 1,000 Hz
Recommended load impedance is more
than 3kQ.
Normal operating voltage: 1.35 V DC
Minimum operating voltage: 1.1 V DC
Current drain: Less than 1.0mA
Battery life: Approx. 180 hours with
EVEREADY No. EPX675
Noise Level:
Maximum Sound
Pressure Input Level:
(at 1,000 Hz,
1 % distortion)
Dynamic Range:
Environmental
Temperatures:
Signal-to-noise ratio;
More than 42 dB (1,000 Hz, 1ubar)
Inherent noise; Less than 32 dB SPL
(0
dB
=2x
107
pbar)
wind
noise
*1:
(with the wind screen)
Less than 50dB SPL.
Induction
noise
from
external
magnetic
field
*2:
Less
than
5dB
SPL/m
gauss
*1
Wind
noise
is
the
value
measured
by
ap-
plying
a
wind
velocity
of
2
m/sec.
from
all
directions
to
the
microphone.
The
mean
value
is
taken
and
converted
to
the
equivalent
input
sound
level.
*2
The
external
magnetic
field
induction
noise
is
measured
with
the
microphone
placed
in
an
alternating
magnetic
field
of
50
Hz,
1
milligauss.
The
maximum
noise
value
is
taken
and
then
converted
to
the
equivalent
input
sound
level.
(OdB=2x 10% wbar)
126
dB
SPL
(0
dB
=2
x
10™
bar)
More than 94dB
-20°C to +60°C for storage
0°C to +60°C for operation
SON
Y.
SERVICE
MANUAL
Fa ee eee

Sony ECM-939LT Specifications

General

Sensitivity	-33dB ±3dB (0dB=1V/Pa at 1kHz)
Connector	XLR
Polar Pattern	Cardioid
Maximum SPL	130 dB
Type	Electret Condenser
Frequency Response	20 Hz - 20 kHz
Power Supply	Battery or Phantom Power
Power Requirements	1.5V DC
Output Impedance	200Ω ±30% at 1kHz

Summary

Microphone Specifications

General Specifications

Details on microphone type, battery, dimensions, weight, and finish.

Performance Characteristics

Covers directivity, frequency response, output level, and impedance.

Noise and Environmental Data

Includes noise levels, max SPL, dynamic range, and operating temperatures.

Disassembly Procedures

Microphone Case Assembly Disassembly

Step-by-step guide for taking apart the microphone case.

Circuit Board Unit Disassembly

Instructions for removing and disassembling the PCB unit.

Mounting Diagram

Conductor Side Mounting

Visual representation of component placement on the conductor side.

Circuit Diagrams

Schematic Diagram

Detailed circuit schematic showing component interconnections and values.

Semiconductor Lead Layouts

Visual guides for the pin configurations of semiconductor components.

Service Information

Exploded View

Illustrated breakdown of the microphone assembly for identification.

Parts List and Notes

General Section Parts

List of general mechanical and structural components.

Electrical Parts List

Catalog of electronic components and their part numbers.

Accessory and Packing Material

Inventory of accessories and packaging components.

Technical Notes

Important notes regarding capacitors, resistors, and coils.