Yamaha MFC2 ユーザーマニュアル

■ CONTENTS

TO SERVICE PERSONNEL .......................................... 2

FRONT PANEL .............................................................. 2

REAR PANELS .......................................................... 3–5

REMOTE CONTROL PANELS ...................................... 6

SPECIFICATIONS / .......................................... 7

INTERNAL VIEW ........................................................... 8

SERVICE PRECAUTIONS

.................................................... 9

DISASSEMBLY PROCEDURES ............. 9–18

AMP ADJUSTMENT

....................... 19–20

UPDATING FIRMWARE

..................................... 21–27

SELF-DIAGNOSTIC FUNCTION

28–30

IC DATA ................................................................. 31–34

PIN CONNECTION DIAGRAMS ............................ 35–36

BLOCK DIAGRAM ....................................................... 37

PRINTED CIRCUIT BOARDS................................ 38–58

SCHEMATIC DIAGRAMS ...................................... 59–66

REPLACEMENT PARTS LIST .............................. 67–87

REMOTE CONTROL.............................................. 88–89

101077

SERVICE MANUAL

STEREO AMPLIFIER

This manual is copyrighted by YAMAHA and may not be copied or

redistributed either in print or electronically without permission.

P.O.Box 1, Hamamatsu, Japan

'08.01

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 understood 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 specified. For these reasons,

we advise all YAMAHA product owners that any service required should be performed by an authorized

YAMAHA Retailer or the appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or

recognition of any applicable technical capabilities, or establish a principle-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, inevitable

and specifications 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 buss in the unit (heavy gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.

A-S2000

2

A-S2000

■ FRONT PANEL

A-S2000 (U, C, R, T, K, A, B, G, L, J models)

WALL

OUTLET

EQUIPMENT

UNDER TEST

AC LEAKAGE

TESTER OR

EQUIVALENT

INSULATING

TABLE

WARNING: CHEMICAL CONTENT NOTICE!

This product contains chemicals known to the State of California to cause cancer, 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.

1. Critical Components Information

Components having special characteristics are marked s

and must be replaced with parts having specifications equal

to those originally installed.

2. Leakage Current Measurement (For 120V Models Only)

When service has been completed, it is imperative to verify

that all exposed conductive surfaces are properly insulated

from supply circuits.

● Meter impedance should be equivalent to 1500 ohms shunted

by 0.15µF.

● Leakage current must not exceed 0.5mA.

● Be sure to test for leakage with the AC plug in both polarities.

All of the P.C.B.s installed in this unit and solder joints are

soldered using the lead free solder.

Among some types of lead free solder currently available,

it is recommended to use one of the following types for the

repair work.

• Sn + Ag + Cu (tin + silver + copper)

• Sn + Cu (tin + copper)

• Sn + Zn + Bi (tin + zinc + bismuth)

Caution:

As the melting point temperature of the lead free solder is

about 30°C to 40°C (50°F to 70°F) higher than that of the lead

solder, be sure to use a soldering iron suitable to each solder.

About lead free solder /

■ TO SERVICE PERSONNEL

3

A-S2000

■ REAR PANELS

A-S2000 (U, C models)

A-S2000 (R model)

A-S2000 (T model)

4

A-S2000

A-S2000 (B model)

A-S2000 (K model)

A-S2000 (A model)

5

A-S2000

A-S2000 (G model)

A-S2000 (L model)

A-S2000 (J model)

6

A-S2000

■ REMOTE CONTROL PANELS

RAS21

(U, C, R, T, A, B, G, L models)

RAS22

(K, J models)

7

A-S2000

■ Audio Section /

Minimum RMS Output Power (Power Amp. Section) /

(20 Hz to 20 kHz, 0.02 % THD)

8 ohms ......................................................................... 90 W + 90 W

4 ohms .................................................................... 150 W + 150 W

Dynamic Power / (IHF)

8/6/4/2 ohms ..................................................... 105/135/190/220 W

Maximum Output Power [B, G models] (1 kHz, 0.7 % THD, 4 ohms)

............................................................................................... 160 W

Maximum Useful Output Power (JEITA) [R, T, K, L models]

(1 kHz, 10 % THD)

8 ohms ................................................................................... 120 W

4 ohms ................................................................................... 190 W

Dynamic Headroom /

8 ohms ................................................................................. 0.67 dB

IEC Output Power [B, G models] (1 kHz, 0.02 % THD)

8 ohms ..................................................................................... 95 W

4 ohms ................................................................................... 155 W

Damping Factor / (1 kHz, 8 ohms)

.................................................................................................... 160

Maximum Input Signal /

CD, etc. .................................................................................... 2.8 V

PHONO (1 kHz) MM ........................................................... 120 mV

MC ................................................................ 7 mV

Frequency Response /

CD, etc.

Flat position, 5 Hz to 100 kHz .................................... +0 / -3.0 dB

Flat position, 20 Hz to 20 kHz .................................... +0 / -0.3 dB

RIAA Equalization Deviation / (20 Hz to 20 kHz)

PHONO MM ........................................................................ ±0.5 dB

MC ......................................................................... ±0.5 dB

Total Harmonic Distortion / (20 Hz to 20 kHz)

CD BAL to SP OUT (90 W, 8 ohms) .................................... 0.01 %

CD, etc. to SP OUT (90 W, 8 ohms) .................................. 0.015 %

PHONO MM (2 V, to REC) ................................................ 0.005 %

MC (2 V, to REC) ................................................... 0.05 %

Intermodulation Distortion / (Rated output, 8 ohms)

CD, etc. to SP OUT .............................................................. 0.02 %

Signal to Noise Ratio / (IHF-A Network) (Input shorted)

CD, etc. (150 mV) ................................................................... 98 dB

PHONO MM (5 mV) ............................................................... 93 dB

MC (500 µV) ............................................................. 85 dB

Residual Noise / (IHF-A Network)

FRONT L/R SP OUT .................................................. 33 µV or less

■ Control Section /

Input Sensitivity/Input Impedance /

CD, etc. .............................................................. 150 mV/47 k-ohms

PHONO MM ....................................................... 2.5 mV/47 k-ohms

MC ........................................................... 100 µV/50 ohms

MAIN IN .................................................................... 1 V/47 k-ohms

Output Level/ Output Impedance /

REC OUT .......................................................... 150 mV/1.5 k ohms

PRE OUT ................................................................. 1 V/1.5 k ohms

Headphone Rated Output /

1 kHz, 0.2 % THD, 32 ohms ................................................. 30 mW

Channel Separation / (1 kHz/10 kHz)

CD, etc. (5.1 k-ohms terminated) ......................... 74/54 dB or more

PHONO (Input shorted, Vol: -30 dB) MM ........... 90/77 dB or more

MC ............ 66/77 dB or more

Tone Control Characteristics /

BASS

Boost/Cut (50 Hz) ................................................................ ±9 dB

Turnover frequency ............................................................ 350 Hz

TREBLE

Boost/Cut (20 Hz) ................................................................ ±9 dB

Turnover frequency ........................................................... 3.5 kHz

Audio Muting /

............................................................................... -20 dB (approx.)

■ SPECIFICATIONS /

U .......... U.S.A. model

C .......... Canadian model

R .......... General model

T .......... Chinese model

K .......... Korean model

A .......... Australian model

B .......... British model

G .......... European model

L .......... Singapore model

J ........... Japanese model

■ General /

Power Supply /

U, C models ........................................................... AC 120 V, 60 Hz

R, L models .......................... AC 110/120/220/230-240 V, 50/60 Hz

T model ..................................................................AC 220 V, 50 Hz

K model .................................................................. AC 220 V, 60 Hz

A model .................................................................. AC 240 V, 50 Hz

B, G models ........................................................... AC 230 V, 50 Hz

J model ............................................................ AC 100 V, 50/60 Hz

Power Consumption

U, C, R, T, K, A, B, G, L models ........................................... 350 W

J model .................................................................................. 220 W

Idling Power Consumption

................................................................................................. 80 W

Off-state Power Consumption

................................................................................................... 0 W

Dimensions (W x H x D)

.......................... 435 x 137 x 465 mm (17-1/8” x 5-3/8” x 18-5/16”)

Weight

............................................................................... 22.7 kg (50 lbs.)

Finish

Black color ................................ U, C, R, T, K, A, B, G, L, J models

Silver color ................................ U, C, R, T, K, A, B, G, L, J models

Accessories

Remote control x 1, Battery (R6, AA, UM-3) x 2, Power cable (2 m) x 1

* Specifications are subject to change without notice due to product

improvements.

435 (17-1/8")

137 (5-3/8")

465 (18-5/16")

418 (16-7/16")

25

(1")

22

(7/8")

16

(5/8")

3

(1/8")

121 (4-3/4")

• DIMENSIONS /

Unit: mm (inch)

8

A-S2000

■ INTERNAL VIEW

1 FRONT (14) P.C.B. (R, L models)

2 FUNCTION (3) P.C.B.

3 FRONT (13) P.C.B.

4 MAIN (2) P.C.B.

5 FUNCTION (2) P.C.B.

6 POWER TRANSFORMER

7 MAIN (3) P.C.B.

8 MAIN (1) P.C.B.

9 FRONT (12) P.C.B.

0 FRONT (11) P.C.B.

A FRONT (9) P.C.B.

B FRONT (2) P.C.B.

C FRONT (1) P.C.B.

D FRONT (3) P.C.B.

E FRONT (6) P.C.B.

F FRONT (5) P.C.B.

G FRONT (4) P.C.B.

H FRONT (7) P.C.B.

I FRONT (8) P.C.B.

J BALANCE P.C.B.

K FUNCTION (1) P.C.B.

L FRONT (10) P.C.B.

23 5 7 96

GFE

0

A

J K L

I

H

B

C D

14 8

Top View

Front View

Rear View

A-S2000

9

■ DISASSEMBLY PROCEDURES /

(Remove parts in the order as numbered.)

Disconnect the power cable from the AC outlet.

1. Removal of Panel Side L/R

a. Remove 2 screws (1), 2 coned disc spring L and 2

washers side. (Fig. 1)

b. Lift the panel side L a little and release 3 hooks. Then

remove the panel side L. (Fig. 1)

c. Remove 2 screws (2), 2 coned disc spring L and 2

washers side. (Fig. 1)

d. Lift the panel side R a little and release 3 hooks. Then

remove the panel side R. (Fig. 1)

2. Removal of Top Cover

a. Remove 7 screws (3), 2 screws (4) and 2 screws

(5). (Fig. 1)

b. Remove the top cover. (Fig. 1)

3. Removal of Front Panel

* Prepare a hexagonal wrench (2 mm) for removal of

knob unit.

a. Loosen lock set screw to remove the knob VOL unit.

(Fig. 1)

b. Loosen lock set screw to remove the knob SEL unit.

(Fig. 1)

c. Loosen each lock set screw to remove 3 knob TC unit.

(Fig. 1)

d. Remove 8 screws (6). (Fig. 1)

e. Set the “POWER ON/OFF” switch to the ON position.

f. Set the “PHONO MM/MC” switch to the MM position.

g. Remove the front panel forward gradually using care

not to cause damage the switches. (Fig. 1)

1

2

3 4 5

6

Panel side L

Panel side R

Washer side

Coned disc spring L

Front panel

Top cover

6

3

1

3

4

5

2

Hook

POWER ON / OFF switch

PHONO ON / OFF switch

Hook

Knob VOL unit

Hexagonal wrench

Knob SEL unit

Knob TC unit

2mm

Lock set screw

Fig. 1

■ SERVICE PRECAUTIONS /

Safety measures

• Some internal parts in this product contain high volt-

ages and are dangerous. Be sure to take safety mea-

sures during servicing, such as wearing insulating

gloves.

• Note that positions indicated below are dangerous even

after the power is turned off because an electric charge

remains and a high voltage continues to exist there.

Before starting any repair work, perform discharge by

connecting a discharge resistor (5k-ohms/10W) be-

tween terminals at following positions. The time re-

quired for discharging is about 30 seconds.

1. C308 on MAIN (3) P.C.B..

2. C309 on MAIN (3) P.C.B..

3. C335 on MAIN (3) P.C.B..

4. C336 on MAIN (3) P.C.B..

Refer to “PRINTED CIRCUIT BOARDS: MAIN (3) P.C.B.”.

* When installing the knob unit, it is necessary to position

them as specified. (Refer to “When installing the knob

unit”.)

A-S2000

10

● When installing the knob VOL unit:

a. Turn the VOLUME (VR501) counterclockwise

fully. (Fig. 2)

b. Match the slit in the knob VOL unit with the

“VOLUME MIN” position and install it in that

state. (Fig. 2)

* At this time, do not tighten the lock set screw.

c. Keep about 0.5 mm to 0.75 mm clearance from

the front panel to knob VOL unit. (Fig. 2)

d. Match the lock set screw position with the cut in

VOLUME (VR501) and tighten the lock set screw.

e. After installation, perform following checks.

• Turn the knob VOL unit both directions to

check that it does not rub against the front

panel.

• Turn the knob VOL unit clockwise fully and

check that the slit in it matches with the

“VOLUME MAX” position.

• Turn the knob VOL unit counterclockwise

fully and check that the slit in it matches with

the “VOLUME MIN” position.

● When installing the knob SEL unit:

a. Turn the INPUT (SW501) so that the cut in it

comes at the top. (Fig. 2)

b. Install the knob SEL unit with its lock set screw

positioned at the top. (Fig. 2)

* At this time, do not tighten the lock set screw.

c. Keep about 0.5 mm to 0.75 mm clearance from

the front panel to knob SEL unit. (Fig. 2)

d. Match the lock set screw position with the cut in

INPUT (SW501) and tighten the lock set screw.

e. After installation, perform following checks.

• Turn the knob SEL unit in both directions to

check that it does not rub against the front

panel.

● When installing the knob TC unit

* Use the same installation procedure for BASS,

TREBLE and BALANCE.

Described here is installation of BALANCE as

an example.

a. Turn the BALANCE (VR504) in both directions

and set it to the center position. (Fig. 2)

* VR504 stops at the center position when it is

turned in both directions.

b. Match the slit in the knob TC unit with the center

position of BALANCE and install it in that state.

(Fig. 2)

* At this time, do not tighten the lock set screw.

c. Keep about 0.5 mm to 0.75 mm clearance from

the front panel to knob TC unit. (Fig. 2)

d. Tighten the lock set screw of the knob TC unit.

(Fig. 2)

Knob VOL unit

Slit

Cut

Lock set screw

Center position of BALANCE

VR501

SW501

VR504

VOLUME MIN

VOLUME MAX

Knob SEL unit

Knob TC unit

Front panel

0.5–0.75mm

Fig. 2

e. After installation, perform following checks.

• Turn the knob TC unit in both directions to

check that it does not rub against the front

panel.

• Turn the knob TC unit counterclockwise

fully and check that the slit in it matches with

the “BALANCE L” position.

• Turn the knob TC unit clockwise fully and

check that the slit in it matches with the

“BALANCE R” position.

11

A-S2000

Fig. 3

7

8

4. Removal of Front Frame Ass’y

a. Remove 4 screws (7) to remove the frame top. (Fig. 3)

b. Remove 8 screws (8). (Fig. 3)

c. Remove CB501, CB504, CB517, CB519, CB521 and

SW1-2. (Fig. 3)

d. Remove the front frame ass’y. (Fig. 3)

7

8

7

Frame top

Front frame ass'y

CB504

CB517CB519 CB521

SW1

SW2

CB501

12

A-S2000

When checking the P.C.B.:

• Put the rubber sheet and cloth over this unit. Then

place the P.C.B.s upside down on the cloth and

check it. (Fig. 4)

• Reconnect all cables (connectors) that have been

disconnected.

• In this unit, the ground of the front frame ass’y is con-

nected to the chassis. When the front frame ass’y is

removed from the chassis, connect the ground point

to the chassis, using a ground lead wire or the like.

(Fig. 4)

Fig. 4

Rubber sheet and cloth

Ground lead

Front frame ass'y

13

A-S2000

A

0

9

B

C

D

E

CB52

CB21

CB22

CB24

CB26

CB73

CB76

CB74

CB72

CB84

CB71

CB405

CB34

CB406

Frame side L

AMP unit R

AMP unit L

POWER unit

Bottom cover

Leg

CB54

CB64

CB25

Fig. 5

9 0

A

B C

5. Removal of Amplifier Unit

a. Remove 8 screws (9) and 2 screws (0). (Fig. 5)

b. Remove the frame side L. (Fig. 5)

c. Remove 4 screws (A). (Fig. 5)

d. Remove CB71-74, CB76, CB84 and CB406. (Fig. 5)

e. Remove the amplifier unit L together with the heat sink.

f. Remove 4 screws (B) and 4 screws (C). (Fig. 5)

g. Remove CB52, CB54, CB64 and CB405. (Fig. 5)

h. Remove the amplifier unit R together with the heat

sink.

D

E

6. Removal of Power Unit

a. Remove 4 legs. (Fig. 5)

b. Remove 18 screws (D). (Fig. 5)

c. Remove the bottom cover. (Fig. 5)

d. Remove 4 screws (E). (Fig. 5)

e. Remove CB21-22, CB24-26 and CB34. (Fig. 5)

f. Remove the power unit. (Fig. 5)

14

A-S2000

● When installing the power unit:

When installing the power unit, be very careful not

to cause any damage to the cable at the bottom

with the end of the screw. (Fig. 6)

Cable

Front side

Rear side

End of the screw

Bottom view

Fig. 6

15

A-S2000

When checking the P.C.B.:

• Remove frame panels L/R.

• Put the rubber sheet and cloth over this unit. Then

place the P.C.B. slantingly on the cloth and check it.

(Fig. 7)

• Reconnect all cables (connectors) that have been

disconnected.

• In this unit, the ground of the amplifier unit L/R is

connected to the chassis. When the amplifier unit L/R

is removed from the chassis, connect the ground

point to the chassis, using a ground lead wire or the

like. (Fig. 7)

• It is also possible to check the amplifier unit L/R from

the bottom. (Fig. 7)

Rubber sheet and cloth

Cloth

Ground lead

AMP unit R

AMP unit L

Fig. 7

16

A-S2000

F G

7. Removal of FUNCITON (2) P.C.B.

a. Remove 4 screws (F) and a screw (G). (Fig. 8)

b. Remove CB401-404. (Fig. 8)

c. Remove the connector TR. (Fig. 8)

d. Disconnect the cable (W4004) from the bottom. (Fig. 9)

e. Remove FUNCTION (2) P.C.B.. (Fig. 8)

Fig. 8

N

H

F

G

I

L

Q

R

O

P

J

K

M

CB27

CB201

CB202

CB203

CB401

CB23

CB2

CB79

CB59

CB402

CB403

CB404

Frame side R

Connector TR

Solder

Barrier SP R

Barrier SP L

Speaker terminal L

Speaker terminal R

FUNCTION (2) P.C.B.

FUNCTION (3) P.C.B.

BALANCE P.C.B.

FRONT (11) P.C.B.

FRONT (13) P.C.B.

FRONT (12) P.C.B.

Solder

17

A-S2000

Bottom view

W4004

Fig. 9

8. Removal of BALANCE P.C.B.

a. Remove 3 screws (H) and 4 screws (I). (Fig. 8)

b. Remove CB59 and CB201-203. (Fig. 8)

c. Remove BALANCE P.C.B.. (Fig. 8)

9. Removal of Speaker Terminal L/R

a. Remove 2 screws (J) and 2 screws (K). (Fig. 8)

b. Remove CB2, CB23 and CB79. (Fig. 8)

c. Remove FUNCTION (3) P.C.B.. (Fig. 8)

d. Remove 2 push rivets (L) and then remove the barrier

SP L. (Fig. 8)

e. Remove 5 screws (M). (Fig. 8)

f. Remove the speaker terminal L together with the

P.C.B.. (Fig. 8)

g. Unsolder the P.C.B. to separate the speaker terminal

L. (Fig. 8)

h. Remove 2 screws (N). (Fig. 8)

i. Remove CB27. (Fig. 8)

j. Remove FUNCTION (11) P.C.B.. (Fig. 8)

k. Remove 4 screws (O) and 3 screws (P). (Fig. 8)

l. Remove frame side R. (Fig. 8)

m. Remove 2 push rivets (Q) and then remove the barrier

SP R. (Fig. 8)

n. Remove 5 screws (R). (Fig. 8)

o. Remove the speaker terminal R together with the

P.C.B.. (Fig. 8)

p. Unsolder the P.C.B. to separate the speaker terminal

R. (Fig. 8)

H I

J K

L

M

N

O P

Q

R

18

A-S2000

U

S

T

S

CB305

Support PRE R

Support PRE L

FUNCTION (1) P.C.B.

FRONT (10) P.C.B.

S T U

10. Removal of FUNCTION (1) P.C.B. and FRONT

(10) P.C.B.

a. Remove 9 screws (S), a screw (T), and 2 screws (U).

(Fig. 10)

b. Remove CB305. (Fig. 10)

c. Remove the cable (W3004) from the bottom. (Fig. 11)

d. Remove FUNCTION (1) P.C.B and FRONT (10) P.C.B.

together with the support PRE L/R. (Fig. 10)

Fig. 10

Fig. 11

Bottom view

W3004

A-S2000

19

(Side A)

MAIN (1) P.C.B.

CB55

VR101

R ch

CB75

DC +4.0 to +8.0 mV

VR201

Front side

(Side A)

MAIN (2) P.C.B.

L ch

10

0 minute

+4.0 to +8.0 mV

DC voltage /

11020

mV

VR201

CB75

DC +4.0 to +8.0 mV

MAIN (2) P.C.B.

L ch

CB55

DC +4.0 to +8.0 mV

MAIN (1) P.C.B.

R ch

VR101

Fig. 1

■ AMP ADJUSTMENT /

● Idling Adjustment

Condition

• Start adjustment 20 minutes or more after the

power is turned on.

• Non loaded condition

Idling Adjustment

Adjust VR201 (Lch)/VR101 (Rch) so that the DC volt-

age of CB75 (Lch)/CB55 (Rch) becomes +4.0 to

+8.0mV. (Fig. 1)

Precaution for handling measuring instrument

The ground side of the measuring instrument to be con-

nected to the speaker terminal of this unit must be kept in

floating condition because this unit is equipped with the

floating balanced power amplifier.

A-S2000

20

● Headphone DC Offset Adjustment

Condition

• Start adjustment 5 sec or more after the power is

turned on.

• No input signal.

• Non loaded condition

DC offset adjustment

Adjust VR202 (Lch)/VR102 (Rch) so that the DC volt-

age of the CB504 becomes -2.0 to +2.0mV. (Fig. 2)

Fig. 2

(Side A)

MAIN (1) P.C.B.

R ch

VR102

VR202

Front side

(Side A)

MAIN (2) P.C.B.

L ch

(Side A)

FRONT (2) P.C.B.

R ch L ch

PHONES

DC -2.0 to +2.0 mV

FRONT (2) P.C.B.

L ch

R ch

DC -2.0 to +2.0 mV

PHONES

R ch

MAIN (2) P.C.B.

VR102VR202

L ch

MAIN (1) P.C.B.

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