SERVICE MANUAL
Published by Sony Techno Create Corporation
Sony Corporation
Audio Business Group
SPECIFICATIONS
ELECTRET CONDENSER
STEREO MICROPHONE
9-887-969-01
2008A04-1
©
2008.01
US Model
Canadian Model
Ver. 1.0 2008.01
ECM-957PRO
General
Type One-point stereo (employing the Mid-side stereo
system), electret condenser microphone
Microphone cord 4mm diameter, two core-shielded OFC (Oxygen-free
copper) cord with Canon XLR-5-12C type connector
and gold plated L-shaped stereo miniplug
Stand screw PF 1/2 screw
Dimensions Approx. 40 × 183mm (diameter × length) (15/8 × 7 1/4
in.), projecting parts and controls not included.
Mass Approx. 330 g (11.7 oz.) including battery and cord
Supplied accessories Wind screen (1)
Microphone holder (PF
1
/2 screw) (1)
Microphone stand (1)
Carrying case (1)
Performance
Frequency respone 50 – 18,000 Hz
Directivity Unidirectional × 2 (Directive angel: 90° or 120°)
(switchable)
Output impedance 600 ohm ± 30% unbalanced
Sensitivity (directive angle 120
°)
Open circuit output voltage
∗
1
: –37 ± 3 dB
Effective output level
∗
2
: –40.8 ± 3 dBm
Difference between L and R channel sensitivity: Less
than 3 dB
Power requirements Normal operating voltage: 1.5 V , R6 (Size AA)
battery
Minimum operating voltage: 1.1V , R6 (Size AA)
battery
Battery life: Approx. 200 hours with Sony R6P (SR)
battery
Maximum sound pressure level input
∗
3
More than 120 dB
SPL
Dynamic range More than 95 dB
Operating temperature range
0°C – 40°C (32°F – 104°F)
∗1 0 dB = 1 v / Pa, 1,000 Hz (1 Pa = 10 μbar = 94 dBSPL)
∗2 0 dBm = 1 mW / Pa, 1,000 Hz
∗3 1% wave distortion at 1,000 Hz. (0 dBSPL = 2 × 103 Pa)
Design and specifi cations 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.
FEATURES
This microphone is suitable for use in a variety of situations such as at
concerts or conferences with digital recording equipment (Sony DAT , MD,
NT (Digital Microcorder) ICD, etc.).
• The turning capsule function allows both vertical and horizontal
sound pick-up.
• The Mid-Side Stereo System provides a natural sound pick up,
delivering a stereo sound image with superb clarity.
• The directive angle (between left and right channels) can be set
to 90° or 120° according to the sound source.
ECM-957PRO
2
SECTION 1
GENERAL
This section is extracted
from instruction manual.
ECM-957PRO
3
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-1. GRIP ASSY
(Page 3)
2-2. GRILL ASSY
(Page 4)
SET
2-3. CHASSIS
(Page 4)
2-4. AMP BOARD
(Page 5)
Note: Follow the disassembly procedure in the numerical order shown below.
2-1. GRIP ASSY
grip assy
ECM-957PRO
4
2-2. GRILL ASSY
2-3. CHASSIS
joint (2) screw
joint (2) screw
grill assy
screw
(+B 1.4 × 6)
screw
(+B 1.4 × 6)
rotary knob
rotary knob
two screws
(+K 2 × 4)
two screws
(+K 2 × 4)
chassis
ECM-957PRO
5
2-4. AMP BOARD
two screws
(+K 2 × 4)
ground plate
AMP board
Remove the twenty five solders.
black
black
black
blue
blue
blue
brown
white
black
black
black
white
white
white
red
red
green
green
red
red
red
red
yellow
yellow
yellow
ECM-957PRO
6
MEMO
ECM-957PRO
ECM-957PRO
77
SECTION 3
DIAGRAMS
3-1. PRINTED WIRING BOARD
• : Uses unleaded solder.
1
A
B
C
D
E
F
G
H
I
23456789
15
24
3
C3
BLK
WHT
RED
BLK
YEL
RED
R3
R5
R11
R10
R7R9R8
R2
R6
C2
C1
Q2
MIC2
(SIDE)
MIC1
(MID)
Q1
R1
R4
C6
Q4
D2
BATTERY
CHECK
POWER
/DIRECTIVE
ANGLE
S1
(POWER/DERECTIVE ANGLE)
Q3
ECB
ECB
S1
C5
-1
-2
D1
IC1
RED
BRN
WHT
BLK
BLU
RED
CN1
DRY BATTERY
SIZE"AA"
(IEC DESIGNATION R6)
1PC,1.5V
BLK
321
C4
L1
120˚ 90˚ OFF
C7
T2
OUTPUT
TRANSFORMER
T1
OUTPUT
TRANSFORMER
RED
8
GGSSDD
9
(CHASSIS)
17
12
11
10
14
16
2
1
4
6
5
3
13
15
GRN
YEL
BLK
BLU
WHT
BLU
RED
RED
GRN
YEL
BLK
BLU
WHT
WHT
BRN
17
BLK
S
S
(CHASSIS)
1-876-391-
(11)
11
1-876-391-
(11)
11
AMP BOARD (SIDE A)
AMP
BOARD
(SIDE B)
SIDE ASSY
ROTARY FRAME ASSY
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
• Y : parts extracted from the conductor side.
• z : Through hole.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor.
Caution:
Pattern face side:
(SIDE B)
Parts face side:
(SIDE A)
Parts on the pattern face side seen from
the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
C
B
These are omitted.
E
Q
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
Ref. No. Location
• Semiconductor
Location
D1 G-7
D2 E-7
IC1 H-7
Q1 A-7
Q2 A-6
Q3 E-7
Q4 D-7
ECM-957PRO
ECM-957PRO
88
3-2. SCHEMATIC DIAGRAM
T1
R6
T2
Q1
Q2
R1 R4
C1
R2
R3
C2
C3
R5
S1-1
Q4
C6
C7
R11
R7
R9
R8
Q3
D2
R10
C4
IC1
D1
S1-2
CN1
MIC1
MIC2
L1
C5
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF)
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
specifi ed.
• A : B+
Line.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages is dc with respect to ground under no-signal (detuned) conditions.
no mark : S1: 90°
* : Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
Note:
The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part
number specifi ed.
Note:
Les composants identifi és
par une marque 0 sont
critiques pour la sécurité.
Ne les remplacer que par
une piéce portant le numéro spécifi é.
9
ECM-957PRO
SECTION 4
EXPLODED VIEWS
1 X-2190-130-1 GRIP ASSY
2 3-255-763-01 SCREW, JOINT (2)
3 3-316-938-41 SCREW (B1.4X6), TAPPING
4 2-545-112-11 KNOB, ROTARY
5 X-2189-239-1 GRILLE ASSY
6 2-545-111-11 KNOB, SWITCH
7 2-545-109-03 CHASSIS
#1 7-627-452-28 SCREW, PRECISION +K 2X4
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
Note:
• -XX and -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.
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Color Indication of Appearance Parts Example:
KNOB, BALANCE (WHITE) . . . (RED)
R R
Parts Color Cabinet’s Color
• Accessories are given in the last of the
electrical parts list.
4-1. GRILL SECTION
The components identifi ed by mark 0
or dotted line with mark 0 are critical for
safety.
Replace only with part number specifi ed.
Les composants identifi és par une marque
0 sont critiques pour la sécurité.
Ne les remplacer que par une pièce portant
le numéro spécifi é.
1
2
3
4
5
4
3
2
6
7
#1
#1
#1
#1
frame section
10
ECM-957PRO
* 51 2-545-122-01 FRAME
52 2-545-110-01 TERMINAL, PLUS
53 2-545-126-01 TERMINAL, MINUS
54 3-701-441-21 WASHER
* 55 2-532-219-00 TERMINAL, GROUND
56 2-545-114-01 WASHER, RUBBER
* 57 2-545-113-01 FRAME, ROTARY
58 2-545-116-01 PLATE, GROUND
59 3-669-480-61 + PTPWH 2
60 A-1510-490-A AMP BOARD, COMPLETE
61 3-257-114-21 SCREW
62 2-513-925-11 CASE, CONNECTOR
63 1-543-298-11 BEAD, FERRITE
64 A-1510-492-A FRAME ASSY, ROTARY
(including MIC1 and Q2)
65 A-1510-495-A SIDE ASSY (including MIC2 and Q1)
66 3-701-443-11 WASHER
CN1 1-560-490-12 PIN, CONNECTOR 5P
T1 X-2190-129-1 TRANSFORMER ASSY
T2 X-2190-129-1 TRANSFORMER ASSY
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
4-2. FRAME SECTION
51
CN1
T2
not supplied
not supplied
not supplied
not supplied
not supplied
not supplied
not supplied
(MIC1)
not supplied
(MIC2)
not supplied
(Q2)
not supplied
(Q1)
T1
52
64
65
53
54
54
55
56
57
56
66
66
55
58
59
59
60
61
62
63
11
ECM-957PRO
SECTION 5
ELECTRICAL PARTS LIST
A-1510-490-A AMP BOARD, COMPLETE
********************
< CAPACITOR >
C1 1-135-177-21 TANTAL. CHIP 1uF 20% 25V
C2 1-135-177-21 TANTAL. CHIP 1uF 20% 25V
C3 1-135-177-21 TANTAL. CHIP 1uF 20% 25V
C4 1-113-642-11 TANTAL. CHIP 47uF 20% 10V
C5 1-113-642-11 TANTAL. CHIP 47uF 20% 10V
C6 1-107-686-11 TANTAL. CHIP 4.7uF 20% 16V
C7 1-107-686-11 TANTAL. CHIP 4.7uF 20% 16V
< DIODE >
D1 8-719-975-40 DIODE RB411D-T146
D2 8-719-989-53 LED CL-200HR-C-TSL (BATTERY CHECK)
< IC >
IC1 8-759-564-83 IC XC6371A701PR
< COIL >
L1 1-419-335-21 COIL, CHOKE 680uH
< TRANSISTOR >
Q3 8-729-230-63 TRANSISTOR 2SC4116YG-TE85L
Q4 8-729-230-63 TRANSISTOR 2SC4116YG-TE85L
< RESISTOR >
R1 1-216-833-11 METAL CHIP 10K 5% 1/10W
R2 1-216-830-11 METAL CHIP 5.6K 5% 1/10W
R3 1-216-830-11 METAL CHIP 5.6K 5% 1/10W
R4 1-216-837-11 METAL CHIP 22K 5% 1/10W
R5 1-245-896-11 METAL CHIP 100K 0.5% 1/10W
R6 1-245-896-11 METAL CHIP 100K 0.5% 1/10W
R7 1-216-839-11 METAL CHIP 33K 5% 1/10W
R8 1-216-835-11 METAL CHIP 15K 5% 1/10W
R9 1-216-833-11 METAL CHIP 10K 5% 1/10W
R10 1-216-833-11 METAL CHIP 10K 5% 1/10W
R11 1-245-896-11 METAL CHIP 100K 0.5% 1/10W
< SWITCH >
S1 1-762-894-11 SWITCH, SLIDE (POWER/DIRECTIVE ANGLE)
*************************************************************
MISCELLANEOUS
**************
63 1-543-298-11 BEAD, FERRITE
CN1 1-560-490-12 PIN, CONNECTOR 5P
T1 X-2190-129-1 TRANSFORMER ASSY
T2 X-2190-129-1 TRANSFORMER ASSY
*************************************************************
ACCESSORIES
************
1-824-982-23 CORD, MICROPHONE (2 CORE)
2-100-951-04 ADAPTER, SCREW STAND (SAD-34)
2-100-952-02 ADAPTER, SCREW STAND (SAD-35)
2-542-105-02 SCREW (B), SET
2-545-055-01 SCREEN, WINDOW
2-545-124-01 POLE, STAND
3-255-458-11 SCREW (DIA. 2), TAPPING
3-298-555-01 MANUAL, INSTRUCTION (ENGLISH,FRENCH,
GERMAN,SPANISH,DUTCH,ITALIAN)
7-623-710-37 WASHER 6, WAVE
A-4540-435-A HOLDER ASSY
X-2190-131-1 CASE ASSY
X-2542-144-1 STAND ASSY, MIC
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
AMP
When indicating parts by reference number, please include the board name.
Note:
• Due to standardization, replacements in
the parts list may be different from the
parts specifi ed in the diagrams or the com-
ponents used on the set.
• -XX and -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.
• RESISTORS
All resistors are in ohms.
METAL: Metal-fi lm resistor.
METAL OXIDE: Metal oxide-fi lm resistor .
F: nonfl ammable
• SEMICONDUCTORS
In each case, u: μ, for example:
uA. . : μA. . , uPA. . , μPA. . ,
uPB. . : μPB. . , uPC. . , μPC. . ,
uPD. . : μPD. .
• CAPACITORS
uF: μF
• COILS
uH: μH
The components identifi ed by mark 0
or dotted line with mark 0 are critical for
safety.
Replace only with part number specifi ed.
Les composants identifi és par une marque
0 sont critiques pour la sécurité.
Ne les remplacer que par une pièce portant
le numéro spécifi é.
ECM-957PRO
REVISION HISTORY
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Also, clicking the version at the top of the revised page allows you to jump to the next revised page.
Ver. Date Description of Revision
1.0 2008.01 New
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