Sony ECM-R300 Service manual
ECM-R300
SECTION 1
GENERAL
This section is extracted
from instruction manual.
SERVICE MANUAL
Ver 1.0 2000. 02
SPECIFICATIONS
General
Type Electret condenser microphone
Output plug L-shaped mini plug
Microphone cord 1.5 mm dia., single cord (shielded)(1.2 m[3.9 feet] long)
Dimensions Approx. 66 × 66 × 26 mm (w × d × h)(2 5/8 × 2 5/8 × 1 1/16 in.)
Mass Approx. 60 g (2.1 oz.)(including battery)
US Model
AEP Model
1 Battery-check indicator
2 Power/nR (noise-reduction) switch
3 L-shaped mini plug
4 Microphone
5 Plug holder
6 SENS (microphone sensitivity) selector
7 Spiral groove (for storing the microphone cord)
MICROFILM
Performance
Frequency response 100 -12,000 Hz
Directivity Omnidirectional
Output impedance 2.8 KΩ
Sensitivity Open circuit output level *
ON : -44 dB ± 3.5 dB
nR-LOW : -38 dB ± 4 dB
nR-HIGH : -44 dB ± 4 dB
* 0 dB = 1V/Pa, 1,000 Hz
Power requirements one R6 (size AA) battery
Battery life : Approx. 20 hours with Sony R6P (SR) battery
Approx. 70 hours with Sony alkaline LR6 (SG) battery
Operating temperature range
0°C to 40 °C (32°F to 104°F)
Storage temperature range
-20°C to 60 °C (-4°F to 140°F)
Design and specifications are subject to change without notice.
ELECTRET CONDENSER MICROPHONE
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
— 2 —
ECM-R300
2-1. SCHEMATIC DIAGRAM
MICROPHONE CAPSULE
(C-1053)
D
S
SECTION 2
DIAGRAMS
AMPLIFIER BOARD
SENS
HIGH
LOW
R1
3.9k
D5
015AZ4.7
C18
0.47
6V
R9
47k
3
R10
47k
S2-1
3
2
3
8
C1
0.22
C2
0.1
Q2-2
NJM2132
AMP
6
1
4
1SS352
1SS352
3
C25
33
4V
D1
D2
R2
10k
R3
22k
C19
0.22
C21
C4
0.22
C3
56p
R4
300k
Q2-1
R5
510
7
C9
0.022
NJM2132
3
C11
0.01
AMP
R6
1k
6
3
5
3
C8
0.022
C10
0.0022
C13
3.3
C5
1
C7
220p
3
C12
4.7
C6
1
3
1
3
2
3
3
3
4
6
5
3
6
3
7
4
8
3
9
4
10
0
11
3
12
6
8
5
6
3
3
7
4
R7
62k
Q1
SSM2000
NOISE CANCELER
L IN
R IN
L VCF C1
L VCF C2
V+
ACOM
VCA PORT
VCF DET IN
SUM OUT
VCA DET IN
VCF CAP
VCA CAP
C14
22p
R8
390k
2
3
3
3
L OUT
R VCF C1
R VCF C2
HUSH ON
THRES
DEFAULT
1
3
3
24
23
NC
3.2
22
3.2
21
20
19
3
18
17
16
0.3
15
3
14
13
NC
C15
220p
C16
680p
C17
0.1
+6.0V
C23
33
10V
1
C201R12
10k
SENS
LOW HIGH
XC6371A601PR
DC/DC CONVERTOR
6
R14
680
S2-2
D3
RB411D
Q4
1
R13
1M
R15
680
32
1.8
D4
SML-310LT-T86
(nR)
L1
220µH
R16
100
C24
220
S1-1
nR
ON
OFF
C22
1
nR
ON
OFF
TOTAL CURRENT
0.21mA
(IEC DESIGNATION R6P)
MINI
PLUG
DRY BATTERY
SIZE "AA"
1PC, 1.5V
S1-2
C26
0.022
4V
D6
1SS387
16
Note on Schematic Diagram:
•All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•All resistors are in Ω and 1/
specified.
4
W or less unless otherwise
• % : indicates tolerance.
•C: panel designation.
•Signal path.
F : MIC
— 3 — — 4 —
Q3-2
NJM2132
AMP
Q3-1
NJM2132
AMP
Loading...