Sony ecm 990 service manual

Page 1

PERFORMANCES

Frequency response:
Directivity:
Output im pedancs:

Output level:

Power requirements:

Noise level:

SPECIFICATIONS

40» 16,000Hz
UIIl-dIrECIanaI per each capsule
200 ohms 120 % at 1,000 Hz

(deviation 13 dB)
Ellectlve output level; -56.0 dBm
(0 dB :1 rnW/10
ubar)
Open circult voltage; 0.14 mV/uhai
Recommended load Impedance is more
than 3k ohms:

Normal operating

voltage; 15 v DC GE
Minimum operating

voltage; 1.1V DC
Current drain; Less than 30mm
Battery life; Approx, 4,000 hours

Wllh EVEREADV 1015,
Approxt 3,000 hours
With EVEREADY E-Sl

SlgnaIAto-nmsu
ratio; Move than 44 dB
(1.000 H2 1 ubar)
Less than 30 dB SPL
(OdB : 2 x lo-4 ulnar)
Less than 50dB SPL

Inherent noise:

Wind neise" 1:

Induction noise
Irom external
magnetic held
2; Less than SdB SPL/m

gauss

'1 Wind noise is the value measured by
applying a wmd velocity ol 6.6 lt/
second from all directions to the
microphone The mean value IS taken
and converted to the equwalent input
sound level. OdB > 2 x10"I ubar,

pressure input level:

ECM-99

USA Model

0NE P0|NT STEREU
ELECTRET CONDENSER
MICROPHUNE

'2 The extEinal magnetic Ileld Induction
noise is measured With the microphone
placed to the alternating magnetic field
01 50Hz, 1m gausst The maximum
noise value is taken and then converted
to the equivalent iliput sound level,
Our 2x10 ubai

Maximum sound
Approx. 126 dB SPL
(DdB = 2 )(104 ubar)

Environmental

temperatures: -4:~140; F (~20:50: Cl for storage
32 ~140 F ( 0 ~60 Cl for operatlon
ERAL
Type: One-point stereo electret condenser
mlcrophone

FET: Two FETs

Capsule: Electret condenser capsule

Battery: Flashlight battery SIZE AA

EVEREADY No, 1015 (manganese)
Not E91 (alkaline)

5/12" dla.91t. (3.9 mm dla. 3m)
cable with two phone plugs

Screen (88 x 76 x43) xCase 25 mm dla.
xTotaI Length 210 (mm)

Screen (3% x3x 1 l/|tl) xCase 1 inch dla.
xTotal Length 8% (inch)

15.9 oz (4509) wllh the attached
cable and battery

S ON Y
SERVICE MANUAL

Microphone cable:

Dimensions:

Weight:

Page 2

ECM- 990

1. EXTERNAL VIEW

X-2523-0030
Knob Axs'y, direction axis selector

2A 523-019-0
Case. 5

X2523-001-0

X-2523-01 1 -0
Screen Ass y

Cab/e, microphone; w/rwo phone plugs

2-523020-00
Knob, M/V switch

X -2523-0 I 3-0
Holder Ass'y, microphone

2. DISASSEMBLY

Screen and Case Hamoval

® Turn the direction axis selector knob fully leftward RKzfix 4
(90 degrees position].

® Hemovs four screws.
cu! portion

C?)
Remove the direction '
axis selector knob

tweezers

case

Use for
fulcrum.