SONY ECM-990 stereo electret condenser microphone Service manual

 PERFORMANCES
Frequency response:
Directivity:
Output impedance:
Output level:
Power requirements:
Noise level:
SPECIFICATIONS
40—16,000 Hz
Uni-directional per each capsule
200 ohms +20 % at 1,000 Hz
(deviation *3 dB)
Effective output level; -56.0 d8m
(0dB =1mW/10
ubar)
Open circuit voltage; 0.14 mV/ubar
Recommended load impedance is more
than 3k ohms.
Normal operating
voltage; 1.5V DC
Minimum operating
voltage; 1.1V DC
Current drain: Less than 300 uA
Battery life; Approx. 4,000 hours
with EVEREADY 1015,
Approx. 3,000 hours
with EVEREADY E-91
Signal-to-noise
ratio; More than 44 dB
(1,000 Hz, 1 ubar)
Less than 30 de SPL
(0dB=2 x 107* ubar)
Less than 50dB SPL
Inherent noise;
Wind noise* 1;
Induction noise
from external
magnetic field
wo Less than 5dB SPL/m
gauss
“1 Wind noise is the value measured by
applying a wind velocity of 6.6 ft/
second from all directions to the
microphone, The mean value is taken
and converted to the equivalent input
sound level, 0dB =2x 107 ubar,
Microphone cable:
USA Model
ONE POINT STEREO
ELECTRET CONDENSER
MICROPHONE
*2 The external magnetic field induction
noise is measured with the microphone
placed in the alternating magnetic field
of 50 Hz, 1 m gauss. The maximum
noise value is taken and then converted
to the equivalent input sound level.
OdB=2x10"* ubar
Maximum sound
pressure input level: Approx. 126dB SPL
(0 dB = 2x 107* ubar)
Environmental d 5 á 3
temperatures: -4 —140, F (-20_~60_ C) for storage
32 -140 F( 0-60 C) for operation
Type: One-point stereo electret condenser
microphone
FET: Two FETs
Capsule: Electret condenser capsule
Battery: Flashlight battery size AA
EVEREADY No. 1015 (manganese)
No. E-91 (alkaline)
542" dia. 9ft. (3.9mm dia. 3m)
cable with two phone plugs
Dimensions: Screen (88 x 76 x 43) x Case 25 mm dia.
x Total Length 210 (mm)
Screen (314 x 3 x 11146) x Case 1 inch dia.
x Total Length 81) (inch)
Weight: 15.90z (450g) with the attached
cable and battery
SONY
SERVICE MANUAL
ECM-990 |
1. EXTERNAL VIEW
X-2523-003-0
Knob Ass’y, direction axis selector
2-523-019-0
Case, B
X-2523-001-0
Screen Ass'y X-2523-011-0
Cable, microphone; w/two phone plugs
2-523-020-00
Knob, M/V switch
X-2523-013-0
Holder Ass'y, microphone
SEA A
2. DISASSEMBL Y
| Screen and Case Removal
© Turn the direction axis selector knob fully left-
(90 degrees position). uly lert-waco RK26x4
6
3) Remove four screws,
cut portion
@ a
Remove the direction A
axis selector knob. "uc
Tweezers
Use for
fulcrum.
ECM-990
Capsule chassis Removal
capsule chassis
(1) Remove two screws (K2.6 x 5).
frame ass'y
(3) Pull the capsule chassis and remove it. .
3. SCHEMATIC DIAGRAM
Ql 2SK39A
S
TI
CO-1I L
CAPSULE
(C-7T) } CNP PI(GRY)
| Î 2 A
|
|
|
| | |
CO-2 | EA
CAPSULE ( =
(CT P2(RED)
re
01, 2: 2SK39A
o
Es
¿eb
4. ACCESSORIES
Part No. Description
X-2523-011-0 Cable, microphone; w/two phone plugs X-2523-013-0 Holder Ass'y, microphone
including;
1-508-527-21 Plug, microphone connector 1-528-027-11 Battery
1-551-072-XX Cable, w/two phone plugs 2-523-070-00 Case, carrying
2-523-073-00 Sheet, protector 2-599-057-21 Manual, instruction
5F0626-1
Printed in Japan
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