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AX-496/396
STEREO AMPLIFIER
AX-496/396
AX-496/396 SERVICE MANUAL
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.
I CONTENTS
SPECIFICATIONS .......................................................... 1 ADJUSTMENTS ............................................................. 7
TO SERVICE PERSONNEL .......................................... 2 BLOCK DIAGRAM ......................................................... 8
REMOTE CONTROL PANEL ........................................ 2 µ-COM DATA ................................................................. 9
IMPEDANCE SELECTOR ............................................. 2 PRINTED CIRCUIT BOARD .................................. 10~25
FRONT PANELS ............................................................ 3 SCHEMATIC DIAGRAM ........................................ 26~29
REAR PANELS .............................................................. 3 PARTS LIST ........................................................... 30~47
INTERNAL VIEW ........................................................... 6 REMOTE CONTROL TRANSMITTER ........................ 48
DISASSEMBLY PROCEDURES ................................... 6
100702
P.O.Box 1, Hamamatsu, Japan
AX-496/396
I SPECIFICATIONS
I Power Section I General
Minimum RMS Output Power Power Supply
8, 20Hz to 20kHz, 0.019% THD R, T models AC110/120/220/240V, 50/60Hz
AX-496 85W+85W A model AC240V, 50Hz
AX-396 60W+60W B, G models AC230V, 50Hz
Maximum Output Power (EIAJ) Power Consumption
1kHz, 10% THD AX-496 Approx. 210W
AX-496 8/6 130W / 150W AX-396 Approx. 150W
AX-396 6 110W AC Outlets (Switched)
Dynamic Power (IHF) R, T, G models 100W Max x 3
8/6/4/2 A, B models 100W Max x 1
AX-496 130/150/185/220W Dimensions (W x H x D) 435 x 151 x 391mm
AX-396 100/120/140/150W (17-1/8" x 5-15/16" x 15-3/8")
DIN Standard Output Power Weight
4, 1kHz, 0.7% THD AX-496 9.5 kg (21lbs)
AX-496 120W AX-396 8.7 kg (19lbs 3oz)
AX-396 95W
Accessories
IEC Output Power Remote Control Transmitter
8, 1kHz, 0.019% THD Batteries
AX-496 100W
AX-396 75W Color
Gold / Black / Titan
Power Band Width
* Specifications subject to change without notice.
8, Half power, 0.04% THD 10Hz to 50kHz
Damping Factor
R ........ General model T ..... China model
8, 20Hz to 20kHz 240
Frequency Response A ........ Australia model B .... British model
20Hz to 20kHz 0±0.5dB G ........ European model
Total Harmonic Distortion (20Hz to 20kHz)
CD/DVD to SP OUT (8, Half power) 0.008% · DIMENSIONS
Signal to Nise Ratio (IHF-A-Network)
(7/8")
21.5
CD/DVD (Input Shorted, CD/DVD DIRECT AMP ON) 110dB
PHONO (Input Shorted) 88dB
Residual Noise (IHF-A-Network)
CD/DVD DIRECT AMP ON 35µV
I Control Section
Input Sensitivity / Impedance
CD/DVD etc. 150mV / 47k
391 (15-3/8")
350 (13-3/4")
PHONO 2.5mV / 47k
Output Level / Impedance
REC OUT 150mV / 1.6k
Headphone Jack Rated Output / Impedance
0.25V / 680
Channel Separation
CD/DVD (Input 5.1k Terminated) 1kHz/10kHz 65 / 50dB
Tone Control Characteristics
BASS ±10dB (20Hz)
TREBLE ±10dB (20kHz)
19.5
(3/4")
Continuous Loudness Control
Attenuation -30dB (1kHz)
130 (5-1/8")
151 (5-15/16")
435 (17-1/8")
21
(13/16")
Unit : mm (inch)
1
AX-496/396
I TO SERVICE PERSONNEL
1. Critical Components Information. AC LEAKAGE
Components having special characteristics are marked s WALL EQUIPMENT TESTER OR
and must be replaced with parts having specifications equal OUTLET UNDER TEST EQUIVALENT
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.
INSULATING
G Meter impedance should be equivalent to 1500 ohm shunted TABLE
by 0.15µF.
G Leakage current must not exceed 0.5mA.
G Be sure to test for leakage with the AC plug in both polarities.
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 Welfare Agency
(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 REA-
SON WHATSOEVER!
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.
I REMOTE CONTROL PANEL I IMPEDANCE SELECTOR
STANDBY/ON
DECK A/B
TAPE
DIR A DIR B
DISC SKIP
CD
PRESET + A/B/C/D/E
TUNER
MD TAPE CD/DVD
AUX PHONO TUNER
IMPEDANCE SELECTOR
VOLUME + WARNING:
Do not change the IMPEDANCE SELECTOR
switch setting while the power to this unit is
on, otherwise this unit may be damaged.
RAX9 V499920
2
AX-496/396
I FRONT PANELS
MAX-496
MAX-396
I REAR PANELS (AX-496)
R model
3
AX-496/396
T model
B model
G model
I REAR PANELS (AX-396)
R model
4
AX-496/396
A model
B model
G model
J model
5
AX-496/396
I INTERNAL VIEW
1 2 3 4 5 6
1 AX-496: MAIN P.C.B. (6) / AX-396: MAIN P.C.B. (7)
2 MAIN P.C.B. (2)
3 MAIN P.C.B. (1)
4 MAIN P.C.B. (3)
5 FUNCTION P.C.B. (4)
6 FUNCTION P.C.B. (5)
7 MAIN P.C.B. (9)
8 MAIN P.C.B. (8)
9 FUNCTION P.C.B. (7)
0 FUNCTION P.C.B. (6)
A FUNCTION P.C.B. (1)
B FUNCTION P.C.B. (2)
78 9 0 A B
I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
1. Removal of Top Cover
Remove 4 screws (1) and 4 screws (2) in Fig. 1.
1
2. Removal of Front Panel
a. Remove 6 screws (3) in Fig. 1. 2
3. Checking and Parts Replacement of MAIN P.C.B. (1)
a. Disconnect the power cord from the AC outlet. 3 6
b. Remove 3 screws (4) attaching the Speaker terminal
5
and Impedance Selector in Fig. 1.
c. Remove 2 screws (5) and remove 1 plastic rivet (6) in 1
Fig. 1, then remove the Sub Chassis.
d. Remove 4 screws (7) in Fig. 1, then remove the MAIN
3 5 7
P.C.B. (1) with Heat Sink and Chassis. 7 7
4
4
Fig. 1
6
AX-496/396
I ADJUSTMENTS
Confirmation of Idling Current
· Right after Power is switched ON, confirm the voltages
measures at R553 (L ch) and R561 (R ch) are between
0.1mV to 10mV.
· If it exceeds 10mV, open (cut off) R552 (L ch), R560 (R
ch) and reconfirm the voltage.
R553 (L ch)
R561 (R ch) Cut
R552 (L ch)
R560 (R ch)
R553 R561
R552 R560
7
AX-496/396
I BLOCK DIAGRAM
M AX-496
CD DIRECT AMP
CD DIRECT AMP
CD DIRECT AMP
ON
CD 10dB PURE DIRECT ON
POWER AMP
OFF
LOUDNESS SP A
OFF 10dB BALANCE
10dB TONE CONTROL OFF 33.5dB
ON
PHONO EQ AMP
SP B
M
PHONES
PHONO MOTOR AUDIO
DRIVER MUTE
Main VR
A LB
RYSP
TUNER B
AUX
SMU
TAPE1 AUDIO MUTE
PB +
15
TAPE1
SMU +
REC 15
Input Select Data
TAPE2 B +
PB
Input Select
Protection
Main VR
RYSP
TAPE2
REC +
Rec Select
Rec Select Data B
U-COM
LB
+
Remote Control
Power ON
12S
Power ON/OFF +
RYPS
RYPS
M AX-396
CD DIRECT AMP
CD DIRECT AMP
CD DIRECT AMP
ON
CD 10dB ON
POWER AMP
LOUDNESS SP A
OFF 10dB BALANCE
10dB TONE CONTROL OFF 31.8dB
PHONO EQ AMP
SP B
M
PHONES
PHONO MOTOR AUDIO
DRIVER MUTE
Main VR
A LB
RYSP
TUNER B
AUX
SMU
TAPE1 AUDIO MUTE
PB +
15
TAPE1
SMU +
REC 15
Input Select Data
MD B +
PB
Input Select
Protection
Main VR
RYSP
MD
REC +
Rec Select
Rec Select Data B
U-COM
LB
+
Remote Control
Power ON
12S
Power ON/OFF +
RYPS
RYPS
8
AX-496/396
I µ-COM DATA
IC101 : M37478M4-409SP
No. Port I/O Form RE Function
1 P53 I I
2 P17 I/O O CEI Chip Enable (Input selector)
3 P16 I/O O CK Clock S-CLK
4 P15 I/O O DATA Data TxD
5 P14 I/O O
6 P13 I/O O TMO Tape Monitor
7 P12 I/O O VRUP Motor Volume (UP)
8 P11 I/O O VRDN Motor Volume (DOWN)
9 P10 I/O O RYPS Power Relay
10 P27 I I ENR Rotary Encoder (Right)
11 P26 I I ENL Rotary Encoder (Left)
12 P25 I I D34/5 AX-496, 396/596 Detect H: 496, 396 L: 596
13 P24 I I
14 P23 I I REC Rec Out Selector Detect IN3
15 P22 I I PRDC Protection (DC) IN2
16 P21 I I PRI Protection (Overload) IN1
17 P20 I I PRPS Protection (Power Supply) IN0
18 Vref I VREF
19 Xin I XIN
20 Xout O XOUT
21 Vss VSS
22 Vcc VCC
23 P50 I I PRINH Release the Protection
24 P61 I/O O
25 /RESET I /RESET
26 P30 I I PD Power Down Detect INT0
27 P31 I I REM Remote Control INT1
28 P32 I I D43 AX-493/393 Detect
29 P33 I I TPM Tape Monitor
30 P40 I/O O LEDTM LED (Tape Monitor)
31 P41 I/O O MUTE Mute
32 P42 I/O O RYSP Speaker Relay
33 P43 I/O O LSBY LED (Power)
34 P00 I/O I PS Power Key On Wakeup
35 P01 I/O I REM Remote Control (Wakeup) Key On Wakeup
36 P02 I/O O LEDP LED (Phono)
37 P03 I/O O LEDTM LED (Tuner)
38 P04 I/O O LEDC LED (CD)
39 P05 I/O O LEDM LED (Tape)
40 P06 I/O O LEDTP LED (MD)
41 P07 I/O O LEDA LED (AUX)
42 P52 I I
9
A B C D E F G H I J
AX-496/396
AX-496
1
I PRINTED CIRCUIT BOARD (Foil side)
P.C.B. MAIN (3)
PRPS
RYSP
RYPS
GND
GND
VRG
PRD
VRP
S12
PRI
MU
P.C.B. MAIN (1)
2
To FUNCTION (1)
3
To FUNCTION (6)
SPEAKERS
4
E
R
E
L
E
15
-15
5
6
IMPEDANCE
SELECTOR
RE
RE
HL
E To FUNCTION (7) YE BE OR
HR
RYSP
A
B
7 BE
OR
10 To MAIN (6) 11
A B C D E F G H I J
AX-496/396
AX-496
1
I PRINTED CIRCUIT BOARD (Foil side) P.C.B. MAIN (5) (R, T models)
To MAIN (4) To MAIN (2)
P.C.B. MAIN (2)
To MAIN (8) (B, G models) To MAIN (9)
To MAIN (5) (R, T models)
BR BR WH YE RE OR RE GY
2
WH
GY
BR
BE
POWER
TRANSFORMER
AC OUTLETS
3
P.C.B. MAIN (6) To MAIN (1)
RE OR BE YE BE OR RE
4
RYPS
+12
E
To MAIN (1)
POWER
TRANSFORMER
5
P.C.B. MAIN (4) (R, T models) POWER
To MAIN (5)
WH RE YE
P.C.B. MAIN (8) (B, G models)
To MAIN (2) P.C.B. MAIN (9)
6
GY BR
RE BR OR
POWER
7 TRANSFORMER
To MAIN P.C.B. (2)
12 13
A B C D E F G H I J
AX-496/396
AX-496
1
I PRINTED CIRCUIT BOARD (Foil side)
P.C.B. FUNCTION (6)
To MAIN (1)
To FUNCTION (4)
+15
-15
R
E
E
E
L
2 P.C.B. FUNCTION (1)
CDDR
CDDL
DATA
CDM
8
-15
CE
CL
15
R
E
E
L
VRG
VRP
1
TLO
E To FUNCTION (1) PRO
PRI
TRO PRPS
-15 RYPS
TLI RYSP 21 22
15 DG
TRI DG
E S12
L
E To MAIN (1) MU
R
3
1 42
LSBY
REM
BASS TREBLE BALANCE LOUDNESS
MD
DG
CD
PH
AU
TU
PS
5V
TA
4 To FUNCTION (8)
To FUNCTION (6)
5 P.C.B. FUNCTION (3)
TLO
E
TRO
-15
TLI
15
TRI
E
L
E
R
GND
CD-D
6 TPMLED
P-D/5V
REC OUT To FUNCTION (11)
CD/DVD DIRECT AMP PURE DIRECT
VOLUME
P.C.B. FUNCTION (2)
INPUT
7
14 15
A B C D E F G H I J
AX-496/396
AX-496
1
I PRINTED CIRCUIT BOARD (Foil side)
P.C.B. FUNCTION (4) P.C.B. FUNCTION (7) P.C.B. FUNCTION (9)
To FUNCTION (5)
CDR
PHR
CDL
PHL
To MAIN (1)
-15
15
E
E
To FUNCTION (8)
To FUNCTION (1)
RYSP
HR
HL
E
A
B
2
TUNER
16 PSG
D EM
30 R
5V
1 IN STANDBY/ON
CE 15
DATA
CL
TAPE
-15
L
E OUT
3 R 15 16
15
CDDL
E
CDDR
CDM
IN B A
SPEAKERS
MD
PHONES
1 30 OUT
4 AUX
P.C.B. FUNCTION (8)
To FUNCTION (1) To FUNCTION (9)
To FUNCTION (10)
LSBY
REM
MD
LSBY
DG
CD
PH
AU
TU
PS
5V
TA
5V
P.C.B. FUNCTION (5)
PSG
D EM
5 R
5V
PHONO TUNER CD/DVD TAPE MD AUX
CD/DVD
P.C.B. FUNCTION (10) P.C.B. FUNCTION (11)
6
To FUNCTION (8) To FUNCTION (1)
TPMLED
PHONO
LSBY
P-D/5V
CD-D
GND
5V
CDR
PHR
CDL
PHL
-15
15
POWER
E
E
CD/DVD DIRECT AMP PURE DIRECT
7 To FUNCTION (4)
16 17
A B C D E F G H I J K L
AX-496
SCHEMATIC DIAGRAM
1 AX-496
PHONO EQ AMP 0 0 0
12.6 0
0 5 8 To MAIN (1)
70
0 6 see page 27
TONE CONTROL AMP
2 14.3
14.2 0.1
0 2 0 0.1 0
10 0 14.3
0 3 0
4 0 5 8