ECM-R300
US Model
AEP Model
SERVICE MANUAL
ELECTRET CONDENSER MICROPHONE
MICROFILM
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)
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.
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.
1Battery-check indicator
2Power/nR (noise-reduction) switch
3L-shaped mini plug
4Microphone
5Plug holder
6SENS (microphone sensitivity) selector
7Spiral groove (for storing the microphone cord)
SECTION 1
GENERAL This section is extracted
from instruction manual.
— 2 —
Ver 1.0 2000. 02
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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 1/4 W or less unless otherwise
specified.
• % : indicates tolerance.
•C: panel designation.
•Signal path.
F : MIC
SECTION 2
DIAGRAMS
2-1. SCHEMATIC DIAGRAM
ECM-R300
— 3 — — 4 —
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
C7
220p
C3
56p
C14
22p
C15
220p
C16
680p
C17
0.1
C10
0.0022
C9
0.022
C11
C19
0.22
C8
0.022
C4
0.22
C6
1
C5
1
Q1
SSM2000
NOISE CANCELER
C20
1
R12
10k
R6
1k
R10
47k
R1
3.9k
R9
47k
R3
22k
R2
10k
R4
300k
R7
62k
R8
390k
R5
510
R13
1M
R14
680
R15
680
C21
1
C22
1
S1-2
S2-2
S1-1
nR
ON
OFF
C26
0.022
LOW HIGH
D6
1SS387
R16
100
D3
RB411D
32
1
D4
SML-310LT-T86
L1
220µH
C24
220
4V
C25
33
4V
C18
0.47
6V
C23
33
10V
+6.0V
NC
NC
C13
3.3
C12
4.7
Q3-2
NJM2132
AMP
Q2-2
NJM2132
AMP
Q2-1
NJM2132
AMP
Q3-1
NJM2132
AMP
7
8
5
64
7
6
5
S2-1 C1
0.22
C2
0.1
HIGH
LOW
1
4
2
38
D5
015AZ4.7
D1
1SS352
D2
1SS352
D
S
L IN
R IN
VCF DET IN
ACOM
V+
VCF CAP
L VCF C1
L VCF C2
R VCF C1
R VCF C2
VCA CAP
VCA DET IN
SUM OUT
VCA PORT
HUSH ON
Q4
XC6371A601PR
1
2
3
3
3
3
3
3
6
3
nR
ON
OFF
SENS
SENS
1.8
6
(nR)
DC/DC CONVERTOR
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6P)
1PC, 1.5V
MINI
PLUG
TOTAL CURRENT
0.21mA
THRES
DEFAULT
L OUT
MICROPHONE CAPSULE
(C-1053)
3
3
3
3
3
3
6
3
3
3
3
3
6
3
3
4
3
4
0
3
3.2
3
3
3.2
0.3
AMPLIFIER BOARD
16
0.01
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Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
• a : Through hole.
•b: Pattern from the side which enables seeing.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component A) the parts face are indicated.
2-2.PRINTED WIRING BOARD
SECTION 3
EXPLODED VIEWS
NOTE:
• -XX, -X mean standardized parts, so they may
have some differences from the original one.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
• The mechanical parts with no reference number
in the exploded views are not supplied.
• Accessories and packing materials are given in
the last of this parts list.
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 3-046-596-01CASE(UPPER)
2 3-046-607-01COVER, GRILLE
3 3-046-600-01GRILLE
4 X-3378-984-1RINGASSY, GRILLE
5 8-814-294-00MICROPHONE CAPSULE C-1053
*6 4-908-792-11SCREW (B2)
7 3-046-602-01KNOB(POWER), SWITCH
8 3-046-606-01TERMINAL (B), BATTERY
9 3-046-605-01TERMINAL (A), BATTERY
*10 A-4542-628-AAMPLIFIER BOARD, COMPLETE
11 3-047-438-01RIBBON, BATTERY
12 3-046-598-01LID,BATTERY CASE
13 3-046-597-01CASE(LOWER)
14 3-046-603-01KNOB(SENS), SWITCH
15 3-046-608-01CUSHION
16 1-792-626-11CORD, CONNECTION (1 CORE)(MINI PLUG)
17 3-048-183-01SCREEN
#1 7-685-104-19SCREW +P 2X6 TYPE2 NON-SLIT
— 5 — — 6 —
•Semiconductor
Location
C22
C21
C26
C14
C7
R13
R3
R2
R4
C4
C5
C3
R17
R1
R9
R10
R7R8
D5
D4
D3
Q4
Q2
D6
D2
D1
S2
R12
R14
R15
C20
C6 C1 C2
L1
C24
C23
C25
C18
C15
C16
C17
C19
Q1
Q3
C12
C11
C13
C10
C8
C9R5
R6
S1
1-677-842
11
(11)
1-677-842
11
(11)
16
AMPLIFIER BOARD
(SIDE A)
AMPLIFIER BOARD
(SIDE B)
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6P)
1PC, 1.5V
HIGH LOW
nR ON OFF
SENS
MICROPHONE CAPSULE
(C-1053)
MINI
PLUG
3
1
A
K
(nR)
-2
-1
-2
-1
2413
12 1
1
45
8
14
58
(GRIL)
12
A
B
C
D
E
F
G
H
3456
Ref. No. Location
D1 D-3
D2 D-4
D3 D-5
D4 C-4
D5 B-4
D6 C-5
Q1 C-3
Q2 D-4
Q3 B-2
Q4 D-5
#1
1
2
3
4
17
5
6
6
6
7
8
9
10
11
12
13
14
15
15
16
#1
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SECTION 4
ELECTRICAL PARTS LIST
ECM-R300
9-927-657-11 Sony Corporation
Personal Audio Division Company 2000B1653-1
Printed in Japan ©2000.2
Published by General Engineering Dept.
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specified in the diagrams or the components
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• CAPACITORS:
uF: µF
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
• COILS
uH: µH
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
When indicating parts by reference number,
please include the board name.
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
AMPLIFIER
— 7 — — 8 —
*A-4542-628-A AMPLIFIER BOARD, COMPLETE
************************
< CAPACITOR >
C1 1-164-222-11 CERAMIC CHIP 0.22uF 25V
C2 1-165-319-11 CERAMIC CHIP 0.1uF 50V
C3 1-162-924-11 CERAMIC CHIP 56PF 5.00% 50V
C4 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C5 1-115-156-11 CERAMIC CHIP 1uF 10V
C6 1-115-156-11 CERAMIC CHIP 1uF 10V
C7 1-164-816-11 CERAMIC CHIP 220PF 2.00% 50V
C8 1-162-995-11 CERAMIC CHIP 0.022uF 50V
C9 1-162-995-11 CERAMIC CHIP 0.022uF 50V
C10 1-162-966-11 CERAMIC CHIP 0.0022uF 10% 50V
C11 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C12 1-135-181-21 TANTALUM CHIP 4.7uF 20% 6.3V
C13 1-104-912-11 TANTAL. CHIP 3.3uF 20.00% 6.3V
C14 1-162-919-11 CERAMIC CHIP 22PF 5% 50V
C15 1-164-816-11 CERAMIC CHIP 220PF 2.00% 50V
C16 1-164-471-11 CERAMIC CHIP 680PF 5.00% 50V
C17 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C18 1-135-145-11 TANTALUM CHIP 0.47uF 10% 35V
C19 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C20 1-115-156-11 CERAMIC CHIP 1uF 10V
C21 1-164-346-11 CERAMIC CHIP 1uF 16V
C22 1-164-346-11 CERAMIC CHIP 1uF 16V
C23 1-113-682-11 TANTAL. CHIP 33uF 20.00% 10V
C24 1-126-246-11 ELECT CHIP 220uF 20% 4V
C25 1-119-749-11 TANTAL. CHIP 33uF 20.00% 4V
C26 1-162-995-11 CERAMIC CHIP 0.022uF 50V
< DIODE >
D1 8-719-016-74 DIODE 1SS352
D2 8-719-016-74 DIODE 1SS352
D3 8-719-975-40 DIODE RB411D
D4 8-719-074-30 LED SML-310LTT86 (nR)
D5 8-719-056-29 DIODE 015AZ4.7-TPL3
D6 8-719-056-23 DIODE MA2S111-(K8).SO
< COIL >
L1 1-419-607-21 INDUCTOR 220uH
< IC >
Q1 8-759-669-01 IC SSM2000S-REEL
Q2 8-759-669-00 IC NJM2132V(TE2)
Q3 8-759-669-00 IC NJM2132V(TE2)
Q4 8-759-669-02 IC XC6371A601PR
< RESISTOR >
R1 1-218-706-11 METAL CHIP 3.9K 0.5% 1/16W
R2 1-218-716-11 METAL CHIP 10K 0.5% 1/16W
R3 1-218-724-11 METAL CHIP 22K 0.5% 1/16W
R4 1-218-751-11 METAL CHIP 300K 0.5% 1/16W
R5 1-218-289-11 RES-CHIP 510 5% 1/16W
R6 1-216-821-11 METAL CHIP 1K 5% 1/16W
R7 1-218-890-11 RES-CHIP 62K 5% 1/16W
R8 1-216-852-91 METAL CHIP 390K 5% 1/16W
R9 1-216-841-11 METAL CHIP 47K 5% 1/16W
R10 1-216-841-11 METAL CHIP 47K 5% 1/16W
R11 1-216-809-11 METAL CHIP 100 5% 1/16W
R12 1-218-716-11 METAL CHIP 10K 0.5% 1/16W
R13 1-216-857-11 METAL CHIP 1M 5% 1/16W
R14 1-216-819-11 RES-CHIP 680 5% 1/16W
R15 1-216-819-11 METAL CHIP 680 5% 1/16W
R16 1-216-809-11 METAL CHIP 100 5% 1/16W
< SWITCH >
S1 1-692-034-41 SWITCH, SLIDE (nR/ON/OFF)
S2 1-572-018-11 SWITCH, SLIDE (SENS)
**************************************************************
MISCELLANEOUS
*************
5 8-814-294-00 MICROPHONE CAPSULE C-1053
16 1-792-626-11 CORD, CONNECTION (1 CORE)(MINI PLUG)
**************************************************************
ACCESSORIES & PACKING MATERIALS
*******************************
3-046-839-11 MANUAL, INSTRUCTION
(ENGLISH/FRENCH/
GERMAN/SPANISH/ITALIAN)
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