SONY ECM-990 stereo electret condenser microphone Service manual
The SONY ECM-990 is a one-point stereo electret condenser microphone with a uni-directional capsule for each channel. It features a frequency response of 40Hz to 16,000Hz and an output impedance of 200 ohms (+20% at 1,000Hz). The microphone requires a 1.5V DC operating voltage and has a battery life of approximately 4,000 hours with an EVEREADY 1015 battery or 3,000 hours with an EVEREADY E-91 battery.
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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 Puno ‘лезет ODE ELSE увы) ‘сыт \ PXZN OOGIGEISZ 4х хоржеиио2 эиоцаолны! “Brg 12425-8051 | iw sfnyd avoyd oMI/M “age \ MX-EZO-1SS-1 À Ji ; Ew d | 4 i £~[ т резины sped Gurpapur sBnyd | 4 guoyd omi/m ‘euoydoudiw "GE g seg FEN O'LIOEZSEX OOGIOECSE voireaiyisads “jage] 000£0€25C Maude / ‘ Ze 192157 jaqeT JA pa Ча ET = реж 008110757 00 PEO TEST sued Bujpnjouy “Assy awe. 0-10 À X AS 00-200-£ZSZ x e SIS A/W "Чо к. 00-020 €ZSZ Sony Corporation © 1975 4 JOJI2jas SIXE SOON ‘зоз2внио:) gx / WORDEN ‘A ssy mag) \ 00-905-505-1 0-E00EESE-X NOS “ayu im Asse aues; / A LY Алене ‘rage 7 Vi parddns 5 E = OC GEO EESE 00-E26 = JO] FULD “Bury 00P10€25% | e paa ua ся 59х97 х | A 558 awes) Bupnyour “Assyé voasas = \ MSI LINA pardons O0'I00 CESE-X | ys Bury ш / 00b16-€LGE \ == > JULIOJSUEJ “40407 as OCUEID-EZS- 1 a a 00'P20EZST Lu À EXE a uONSENP “ASS qouy © YIM “A SS awe O'E00-CESE-X = D'é00-EESE-X MII & ECELEENTE x Ш LO 9-954-357-01
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Key Features
- Stereo electret condenser capsule
- Uni-directional capsule
- Frequency response: 40Hz - 16,000Hz
- Output impedance: 200 ohms (+20% at 1,000Hz)
- Operating voltage: 1.5V DC
- Battery life: 4,000 hours (EVEREADY 1015) or 3,000 hours (EVEREADY E-91)
- Wind noise: Less than 5 dB SPL / m / gauss
- Maximum sound pressure input level: Approx. 126 dB SPL
Frequently Answers and Questions
What are the operating voltage requirements for the ECM-990?
The ECM-990 requires a normal operating voltage of 1.5V DC and a minimum operating voltage of 1.1V DC.
What is the battery life of the ECM-990?
The battery life of the ECM-990 is approximately 4,000 hours with an EVEREADY 1015 battery or 3,000 hours with an EVEREADY E-91 battery.
What is the wind noise level of the ECM-990?
The wind noise level of the ECM-990 is less than 5 dB SPL / m / gauss.