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AX-596
STEREO AMPLIFIER
AX-596 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
AX-596
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.
s CONTENTS
SPECIFICATIONS .......................................................... 1 BLOCK DIAGRAM ......................................................... 6
TO SERVICE PERSONNEL .......................................... 2 µ-COM DATA ................................................................. 7
IMPEDANCE SELECTOR ............................................. 2 PRINTED CIRCUIT BOARD .................................... 8~15
REAR PANELS .............................................................. 3 SCHEMATIC DIAGRAM ........................................ 16~17
INTERNAL VIEW ........................................................... 5 PARTS LIST ........................................................... 18~27
DISASSEMBLY PROCEDURES ................................... 5 REMOTE CONTROL TRANSMITTER ........................ 28
ADJUSTMENTS ............................................................. 6
100717
AX-596
s SPECIFICATIONS
s Power Section s General
Minimum RMS Output Power Power Supply
8, 20Hz to 20kHz, 0.015% THD 100W + 100W U, C models AC120V, 60Hz
Maximum Output Power (EIAJ) B, G models AC230V, 50Hz
1kHz, 10% THD A model AC240V, 50Hz
8/6 145W / 170W R, T models AC110/120/220/240V, 50/60Hz
Dynamic Power (IHF) Power Consumption
8/6/4/2 140/170/220/290W Approx. 220W
DIN Standard Output Power AC Outlets
4, 1kHz, 0.7% THD 150W 3 switched outlets
U, C, G, R, T models 100W max, total
IEC Output Power 1 switched outlets
8, 1kHz, 0.015% THD 110W A, B models 100W max, total
Power Band Width Dimensions (W x H x D) 435 x 151 x 396mm
8, 50W, 0.03% THD 10Hz to 50kHz (17-1/8" x 5-15/16" x 15-9/16")
Damping Factor Weight
8, 20Hz to 20kHz 320 11.0 kg (23lbs. 5oz.)
Frequency Response
Accessories
20Hz to 20kHz 0 ±0.5dB
Remote Control Transmitter
20Hz to 100kHz 0 +0.5, 3dB
Batteries
Total Harmonic Distortion (20Hz to 20kHz)
Color
CD/DVD to SP OUT (8, 50W) 0.008%
Gold / Black / Titan
Signal to Noise Ratio (IHF-A-Network) * Specifications subject to change without notice.
CD/DVD (Input Shorted, CD/DVD DIRECT AMP ON) 110dB
PHONO (Input Shorted) 92dB
U ........ U.S.A. model C .... Canada model
Residual Noise (IHF-A-Network)
CD/DVD DIRECT AMP ON 35µV G ........ European model B .... British model
s Control Section A ........ Australia model T ..... China model
Input Sensitivity / Impedance R ........ General model
CD/DVD etc. 150mV / 47k
PHONO 2.5mV / 47k
· DIMENSIONS
Output Level / Impedance
PRE OUT 1V / 1.2k
REC OUT 150mV / 0.6k
Headphone Jack Rated Output / Impedance
0.33V / 680
Channel Separation
CD/DVD (Input 5.1k Terminated) 1kHz/10kHz 65 / 50dB
Tone Control Characteristics
BASS ±10dB (20Hz)
TREBLE ±10dB (20kHz)
Continuous Loudness Control
Attenuation 30dB (1kHz)
1
AX-596
s TO SERVICE PERSONNEL
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.
q Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
q Leakage current must not exceed 0.5mA.
q 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.
s IMPEDANCE SELECTOR
2
AX-596
s REAR PANELS
U model
C model
R model
A model
3
AX-596
B model
G model
T model
J model
4
AX-596
s INTERNAL VIEW
1 MAIN P.C.B. (9)
2 MAIN P.C.B. (2)
3 MAIN P.C.B. (1)
4 MAIN P.C.B. (5)
5 FUNCTION P.C.B. (13)
6 FUNCTION P.C.B. (4)
7 FUNCTION P.C.B. (5)
8 MAIN P.C.B. (10)
9 MAIN P.C.B. (11)
0 FUNCTION P.C.B. (7)
A FUNCTION P.C.B. (6)
B FUNCTION P.C.B. (3)
C FUNCTION P.C.B. (1)
s DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Disconnect the power cord from the AC outlet.
1. Removal of Top Cover
a. Remove 6 screws (1) in Fig. 1.
2. Removal of Front Panel
a. Remove 6 screws (2) in Fig. 1.
3. Removal of Sub Chassis
a. Remove 4 plastic rivets (3) in Fig. 1, then remove the Side Plates.
b. Remove 5 screws (4) in Fig. 1.
4. Removal of Power Transformer
a. Remove 4 screws (5) in Fig. 1.
b. Remove 4 screws (6) in Fig. 1.
5. Checking and Parts Replacement of MAIN P.C.B. (1)
a. Remove 2 plastic rivets (7) in Fig. 1.
b. Remove 12 screws (8) in Fig. 1, then remove the MAIN P.C.B. (1) with
Heat Sink.
Fig. 1
5
AX-596
s ADJUSTMENTS
Confirmation of Idling Current
· Right after Power is switched ON, confirm the voltages
measured at R111, R135 (L ch) and R112, R136 (R ch)
are between 0.4mV to 8.0mV.
· If it exceeds 8.0mV, open (cut off) R175 (L ch), R176 (R
ch) and reconfirm the voltage.
s BLOCK DIAGRAM
6
AX-596
s µ-COM DATA
IC308 : M34748E8SP
7
A B C D E F G H I J
AX-596
1
s PRINTED CIRCUIT BOARD (Foil side)
P. C. B. MAIN (1) To/From FUNCTION (1)
PRPS
RYSP
RYPS
GND
GND
VRG
PRO
VRP
S12
PRI
MU
2
From FUNCTION (1)
-15
15
R
E
E
E
E
L
SPEAKERS B
3
BL
WH
RE
4 BE
To MAIN (5)
5
WH
BL
WH
IMPEDANCE
SELECTOR
6 BE BE
P. C. B. MAIN (7)
OR OR
+12S
POW
E
HR
HL
LB
E
A
B
7 From FUNCTION (7) From MAIN (2) From MAIN (9)
8 9
A B C D E F G H I J
AX-596
1
s PRINTED CIRCUIT BOARD (Foil side)
P. C. B. MAIN (2) P. C. B. MAIN (5)
SPEAKERS A
P. C. B. MAIN (11) To MAIN (7) + L - + R -
+12S
POW
E
POWER
2 From MAIN (10)
RE
AC OUTLETS
BE WH BL
WH BR
3
WH WH From MAIN (1)
GY
WH
AC
4
P. C. B. MAIN (4) P. C. B. MAIN (9) P. C. B. MAIN (10)
(R, T models only)
To MAIN (2)
5 GY
WH
OR
YE
RE
WH
RE YE
BE
OR
POWER
BL
TRANSFORMER
WH
BE
BE
WH
6
BR BR
BE OR OR
BR
VOLTAGE
SELECTOR
To/From MAIN (4)
To MAIN (1) (R, T models only)
7 To/From MAIN (10)
10 11
A B C D E F G H I J
AX-596
1
s PRINTED CIRCUIT BOARD (Foil side)
To/From FUNCTION (3)
P. C. B. FUNCTION (1)
To/From FUNCTION (1)
VOLUME INPUT
PURE DIRECT CD/DVD DIRECT AMP
FUNCTION (6)
REC OUT
2
To/From
1
TRO LI
E E
TLO LO
-15 E LI
TRI RO E
E E LO
TLI RI E
To/From 8
RO
E
3 FUNCTION RI
(13) -15
LED3
LED4
POR
15
POL
MIR
MIL
MU VRG
-15
P. C. B. FUNCTION (3)
15
E
E
E
E
VRdn LED3
E VRup LED4 1 10
L VRP VRG
E ENR VRdn
R ENL VRup
E DG VRP
5V ENR
REC ENL
DG
5V
REC
CDDR
CDDL
CDM
To/From FUNCTION (8)
R
To MAIN (1)
E
E
E
E
L
4
P. C. B. FUNCTION (4)
To/From FUNCTION (4)
42 1
PS 1 4
DG
REW 30 1
5V
AU
TA
MD 8 5
AUX
CD
TU
PH
LSBY
REC OUT
5
MD
16 15
1 4
22 21
MD
PB
8 5
30 1
PB REC OUT
TAPE TAPE
PRPS
RYPS
RYSP
VRG
Data
PRD
VRP
S12
MU
DG
DG
PAI
-15
CE
CL
15
To/From FUNCTION (4) To/From MAIN (1) 1 4
6
16 15 CE
Data
CL
8 5 -15
15
TUNER
1 4
8 5
CDDR
CDDL
CDM
CDR
PHR
CDL
PHL
-15
15
R
E
E
E
E
E
E
E
E
L
From FUNCTION (5)
7
To/From FUNCTION (1)
12 13
A B C D E F G H I J
AX-596
1
s PRINTED CIRCUIT BOARD (Foil side)
P. C. B. FUNCTION (5) To FUNCTION (4) P. C. B. FUNCTION (7) From FUNCTION (9) P. C. B. FUNCTION (8)
CDR
PHR
CDL
PHL
-15
15
E
E
E
E
PHONES
SPEAKERS AUX MD TAPE CD/DVD TUNER PHONO
A B 5V M
RE
DG
PHONO
PS
8
2
LSBY
LSBY
REW
5V
MD
DG
CD
PH
AU
PS
TU
5V
TA
1
To/From FUNCTION (1)
To FUNCTION (10)
B
A
LB
HR
CD/DVD
E
HL
3
To MAIN (1)
P. C. B. FUNCTION (6) P. C. B. FUNCTION (9) P. C. B. FUNCTION (10)
4 LOUDNESS BALANCE TREBLE BASS
STANDBY/ON From FUNCTION (8)
LSBY
POWER
5V
To FUNCTION (8)
PS
DG
REM
5V
5 1
8
TRO
E
TLO
P. C. B. FUNCTION (11) P. C. B. FUNCTION (13)
-15
TRI
E From FUNCTION (1) To/From FUNCTION (1)
TLI
To/From FUNCTION (1)
POR
POL
MIR
MIL
MU
-15
15
E
E
E
6
LED3
LED2
LED1
CD/DVD PURE
DIRECT AMP DIRECT PRE OUT
1 MAIN IN
7 8
14 15
A B C D E F G H I J K L
AX-596
SCHEMATIC DIAGRAM K
4
1
PHONO EQ AMP 0
12.7
0
0 11.8 12.4 13.0
CD/DVD DIRECT AMP &
PURE DIRECT OFF
To MAIN (1)
see page 17
0
TONE CONTROL AMP
0
0
-12.8 13.4
2 13.7 0.1
0 0
0.1
0 0
12.9
13.0 13.8 13.5
0 0.1
0
-0.6 -0.6
0.6 0.6
0 0
0.1
VOLUME AMP
-13.6 -13.0
-13.1
-13.6
CD BUFFER 0.1
0.1
0
-14.5