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  9. Yamaha Silent Viola SVV-200 User manual

Yamaha Silent Viola SVV-200 User manual

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SERVICE MANUAL
HAMAMATSU, JAPAN
0.944K-068 Printed in Japan 2002.05
011635
NV
CONTENTS
SPECIFICATIONS .............................................................................. 3
PANEL LAYOUT.................................................................................. 4
CIRCUIT BOARD LAYOUT................................................................. 6
BLOCK DIAGRAM .............................................................................. 7
DISASSEMBLY PROCEDURE ........................................................... 8
IC BLOCK DIAGRAM.........................................................................11
CIRCUIT BOARDS ............................................................................11
INSPECTIONS.................................................................................. 13
POINTS TO CHECK WHEN NOISE HAS OCCURED ..................... 13
.......................................................................................................... 14
.......................................................................................................... 14
TUNING ............................................................................................ 15
OVERALL CIRCUIT DIAGRAM
PARTS LIST
This document is printed on chlorine free (ECF) paper with soy ink.
SVV-200
20020420-125000
2
SVV-200
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed.
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical / electronic and / or plastic (where
applicable) components may also contain traces of chemicals found by the California Health and WelfareAgency (and possibly other
entities) to cause cancer and / or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL / ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY
REASON WHAT SO EVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to
solder / flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.
IMPORTANT NOTICE
This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed
that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and under-
stood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in
personal injury, destruction of expensive components and failure of the product to perform as speci-
fied. For these reasons, we advise all Yamaha product owners that all service required should be
performed by an authorized Yamaha Retailer or the appointed service representative.
IMPORTANT:
This presentation or sale of this manual to any individual or firm does not constitute authorization, certifica-
tion, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any
form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineering,
and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevi-
table and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy
appear to exist, please contact the distributor's Service Division.
WARNING:
Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus).
IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power
to the unit.
3
SVV-200
SPECIFICATIONS
Neck ......................................... Hard Maple
Body ......................................... Spruce
Fingerboard/Tuning Pegs......... Ebony
Bridge....................................... Hard Maple (Aubert)
Frame....................................... Plywood
Chin Rest/Tailpiece .................. Ebony
Adjuster .................................... 1st string (Wittner)
Strings ...................................... Ball-end type (Dominant)
Sensor...................................... Stereo Piezo pick-up (underneath the bridge)
Connectors/Controls ................ • Headphone Output
• EQ CTRL (Equalizer Control)
• LINE OUT
• VOLUME
• EQ MODE Switch (EQ MODE 1/EQ MODE 2)
• POWER Switch (ON/OFF)
Power ....................................... 6F22 (S-006P) 9V battery x1
Battery Life (Continuous Use) .. Using Manganese battery : approximately 5 hours
Using Alkaline battery : approximately 12 hours
String Length............................ 375 mm (14-3/4”)
Body Length ............................. 406 mm (16”)
Output Impedance.................... 1kΩ(LINE OUT)
Dimensions .............................. 677 (L) x 246 (W) x 129 (H) mm
27-5/8” (L) x 9-11/16” (W) x 5-1/16” (H)
Weight (with battery) ................ approximately 740g (1 lbs. 10 oz.)
4
SVV-200
PANEL LAYOUT
FRONT
Tuning peg
Nut
Neck
Fingerboard
4th string (C) 2nd string (D)
3rd string (G) 1st string (A)
Frame
Body
Bridge
Bridge seat
Adjuster
Tailpiece
Chin rest
End pin
Tailpiece Wire
5
SVV-200
CONTROL PANEL side
q
w
e
r
qPOWER Switch
wVOLUME
eEQ CTRL (Equalizer Control)
rEQ MODE Switch
• EQ MODE 1
• EQ MODE 2
y
u
t
tPickup Balancer (located inside)
yLINE OUT jack: Standard phone type
uPHONES jack: Stereo mini type
iBattery Case: 6F22(S-006P) 9V
i
Adjustable Range
Increase the
high sensor
Increase the
low sensor
6
SVV-200
CIRCUIT BOARD LAYOUT
MA MA
JK
PHONE Jack
Battery Box
7
SVV-200
BLOCK DIAGRAM
8
Pickup
Sensor
(Low)
Pickup
Sensor
(High)
Pickup
Assembly
3
55
21
3
3
3
3
2
2
1
1
1
1, 23
12
76
6
24
1
IC1-8P
18
2
7
4
4
4
4
4
6
5
33
67
VOLUME
VR1
SW2
SW1
VR2
EQ CTRL
Pickup
Balancer
TR4
TR1
LD1
TR5
TR3
TR2
+9A
+4.5V
+4.5V
+4.5V
+4.5V
+4.5V
+4.5V
+4.5V
+4.5V
+4.5V
+9A
+4.5V
+4.5V
+9A
+9A
+9A +9A
8
*6
*6
8
+9A
+9A
+5A
+9A
+9A
+9A1
+4.5V
REGULATOR
+5V
GR RE
CN4-3P
CN5-2P
MA JK
CONTROLLED/
DIRECT
POWER ON/OFF
RY1
PHONES
LINE OUT
BATTERY
MJ-074N
JK2
IC3-8P
OP AMP
IC5-8P
OP AMP
IC2-8P
OP AMP
OP AMP
IC1-8P
OP AMP
IC2-8P
OP AMP
IC4-8P
OP AMP
IC5-8P
OP AMP
IC6-4P
IC8-3P
D1
MUTE
IC7-4P
RESET
SUM
SUM
SUM
From IC6
to RY1 1Pin
FT1
FT2
VR3
FT3 H.P.F
CN1-3P
2, 4
2, 4
D2
CN2-5P
CN3-5P
ONOFF
*1
*2
*3
*4
*5
MA Ver-A- MA Ver-B-
IC1, 2 uPC4570G2 NJU7062
IC4 uPC4570G2 LMH6647
*1 PS7113L Not install
*2 Open Short
*3 - Connect IC4-Pin8
(SD: Shutdown)
*4 IC4 Pin1 IC4 Pin6
*5 IC4 Pin8 IC4 Pin7
*6 +9A1 +9A
Only Ver. A
8
SVV-200
DISASSEMBLY PROCEDURE
(Fig. 1) (Fig. 3)(Fig. 2)
[60]
[60]
[80]
[80]
[30]
[30]
(Fig. 4)
PREPARATION
Before disassemble the unit, proceed as follows.
• Turn off the power. (Fig.1)
• Remove the chin rest.
• Remove the battery from the battery box. (Fig.2)
• Remove all the strings and the bridge. (Fig.3)
1. MA Circuit Board (Time required: about 2 min)
1-1 Remove the four (4) screws marked [60] to remove
the cover assembly. (Fig.4)
1-2 Remove the two (2) screws marked [50]. (Fig.5)
1-3 Remove the VR knob marked [60]. The MA circuit
board can then be removed. (Fig.5)
* The shield cover is attached to the circuit
board with adhesive tape, so remove it
carefully.
[30]: Flat Head Screw M2.6x6 MFZN2BL (EC020020)
[60]: Bind Head Tapping Screw-1 3.0x12 MFZN2BL (VB998200)
[80]: Flat Head Tapping Screw-1 3.0x14 MFZN2BL (VC043700)
9
SVV-200
[60]
[50]
COVER ASSEMBLY
MA
(Fig. 5)
2. JK Circuit Board (Time required: about 2 min)
2-1 Remove the three (3) screws marked [80] to
remove the battery plate assembly. (Fig.4)
2-2 Remove the hexagonal nut marked [A]. The JK
circuit board can then be removed. (Fig.6)
* The JK circuit board is attached to the side
board with adhesive tape, so remove it
carefully.
* When removing the JK circuit board, take
care not to lose the two SPACER 1.0. (Fig. 6)
3. HP Jack Assembly (Time required: about 2 min)
3-1 Remove the battery plate assembly.
(See procedure 2-1)
3-2 Remove the nut marked [B]. The HP jack assembly
can then be removed. (Fig.6)
(Fig. 6)
[50]: Bind Head Tapping Screw-P PW 3.0x8 MFZN2BL (V9343100)
[60]: Konb (V2300100)
Nut [A]
Nut [B]
Nut [A]
Nut [B]
Side Board UnitSide Board Unit
SPACER 1.0SPACER 1.0
JK Circuit BoardCircuit Board
HP Jack AssemblyHP Jack Assembly
10
SVV-200
Pic
Pic
kup Assemb
kup Assemb
lyPickup Assembly
Escutcheon
Escutcheon
Escutcheon
[110] [70]
4. Battery Box Assembly
(Time required: about 2 min)
4-1 Remove the battery plate assembly.
(See procedure 2-1)
4-2 Remove the four (4) screws marked [30]. The
battery box assembly can then be removed. (Fig.4)
5. Pickup Assembly (Time required: about 1 min)
5-1 Remove the cover assembly. (See procedure 1-1)
5-2 Push the cable of the pickup assembly into a hole
on the body assembly so that the pickup assembly
floats.
The pickup assembly can then be removed. (Fig.7)
6. Side Board Unit (Time required: about 1 min)
6-1 Remove the screw marked [70] and the two (2)
screws marked [110]. The side board unit can then
be removed. (Fig.8)
(Fig.7)
(Fig. 8)
[70]: Flat Head Tapping Screw-1 3.0X14 MFZN2BL (VC043700)
[110]: Flat Head Tapping Screw-1 3.0X20 MFZN2BL (VH922600)