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STEREO AMPLIFIER

AX-397 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).




DPX-1200
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.




AX-397
s CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . 2­3 ADJUSTMENT / 11
IMPEDANCE SELECTOR . . . . . . . . . . . . . . . . . . . . . . 3 IC DATA / 12
REMOTE CONTROL PANEL . . . . . . . . . . . . . . . . . . . 3 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 PIN CONNECTION DIAGRAM / 14
REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4­6 PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 15­20
SPECIFICATIONS / 7­8 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . 21­22
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23­33
DISASSEMBLY PROCEDURES / 9 REMOTE CONTROL RAX15 . . . . . . . . . . . . . . . . . . 34




© 2005 YAMAHA CORPORATION. All rights reseved.
100976 This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.

'05.09
AX-397




s TO SERVICE PERSONNEL
AC LEAKAGE
1. Critical Components Information WALL EQUIPMENT TESTER OR
Components having special characteristics are marked Z OUTLET UNDER TEST EQUIVALENT
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 INSULATING
from supply circuits. TABLE

q Meter impedance should be equivalent to 1500 ohms shunted q Leakage current must not exceed 0.5mA.
by 0.15µF.
q Be sure to test for leakage with the AC plug in both
polarities.
"CAUTION"
"F151, F152 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 6A, 125V FUSE."
A V
CAUTION
F151, F152 : REPLACE WITH SAME TYPE 6A, 125V FUSE.
ATTENTION
F151, F152 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 6A, 125V.



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 REASON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes
AX-397




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.


About Lead Free Solder /
The P.C.B.s installed in this unit are soldered using the fol-
lowing solder.




Side A SMT REFLOW Process



Solder Dip
Side B
MI FLOW Process


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)


2
AX-397



Caution:
1. 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.
2. If lead solder must be used, be sure to remove lead free
solder from each terminal section of the parts to be replaced
and from the area around it completely before soldering, or
make sure that the lead free solder and lead solder melt
together fully.




s IMPEDANCE SELECTOR s REMOTE CONTROL PANEL




IMPEDANCE SELECTOR




DPX-1200
AX-397
WARNING:
Do not change the setting of the IMPEDANCE SELECTOR switch
when the unit power is switched on, as doing so may damage
the unit.




s FRONT PANEL




3
AX-397




s REAR PANELS
w C models




w R model
AX-397




w T model




4
AX-397




w A model




w B model




DPX-1200
AX-397
w G, E models




5
AX-397




w L model




w J model
AX-397




6
AX-397




s SPECIFICATIONS
AUDIO SECTION / GENERAL /
Minimum RMS Output Power (Power Amp. Section) / Power Supply /
L/R, 20 Hz to 20 kHz C model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 120 V, 60 Hz
C, R, T, A, B, G, E, L, J models (0.019% THD, 8 ohms) . . . . . . 60 W + 60 W R model . . . . . . . . . . . . . AC 110/120/220/230-240 V, 50/60 Hz
C, R, T, A, B, G, E, J models (0.038% THD, 6 ohms) . . . . . . . . 70 W + 70 W T model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 220 V, 50 Hz
Dynamic Power Per Channel (IHF) / A model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 240 V, 50 Hz
8/6/4/2 ohms . . . . . . . . . . . . . . . . . . . . . . . 100/120/140/150 W B, G, E models . . . . . . . . . . . . . . . . . . . . . . . . AC 230 V, 50 Hz
Maximum Power Per Channel (B, G, E models) L model . . . . . . . . . . . . . . . . . . . . AC 220/230-240 V, 50/60 Hz
1 kHz, 0.7 % THD, 4 ohms . . . . . . . . . . . . . . . . . . . . . . . . . 95 W J model . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 100 V, 50/60 Hz
IEC Power (B, G, E models) Power Consumption / . . . . . . . . . . . . . . . . . . . 170 W
1 kHz, 0.019% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . . 75 W Standby Power Consumption /
Power Band Width / C, T, A, B, G, E, J models . . . . . . . . . . . . . . . . . . . . . . . . 1.1 W
L/R, 0.04% THD, 30 W, 8 ohms . . . . . . . . . . . . 10 Hz to 50 kHz R model (AC 110/120 V) . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 W
Damping Factor / R, L models (AC 220/230-240 V) . . . . . . . . . . . . . . . . . . . 2.7 W
20 Hz to 20 kHz, SPEAKER-A, 8 ohms . . . . . . . . . 240 or more Maximum Power Consumption
Maximum Power (EIAJ) / R model (1 kHz, 6 ohms, 10% THD) . . . . . . . . . . . . . . . 400 W
1 kHz, 10 % THD AC Outlet /
R, T, L, J models (8 ohms) . . . . . . . . . . . . . . . . . . . . . . . . 100 W 3 Switched Outlet
R, T, J models (6 ohms) . . . . . . . . . . . . . . . . . . . . . . . . . . 110 W R, J models . . . . . . . . . . . . . . . . . . . . . . . . . . 50 W Max. total
Input Sensitivity/Input Impedance / C, T, G, E, L models . . . . . . . . . . . . . . . . . . 100 W Max. total
PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 mV/47 k-ohms 1 Switched Outlet
CD, etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 mV/47 k-ohms A, B models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 W Max.
Maximum Input Signal / Dimensions (W x H x D) /
PHONO MM, 1kHz, 0.003 % THD . . . . . . . . . . . . . . . . . 115 mV . . . . . . . . . . . . . . . . . . . . . . . . . 435 x 151 x 390 mm
CD, etc., 1kHz, 0.5 % THD . . . . . . . . . . . . . . . . . . . . . . . . 2.2 V (17-1/8" x 5-15/16" x 15-3/8")
Output Level/Output Impedance / Weight / . . . . . . . . . . . . . . . . . . . . . . . . . 8.3 kg (18 lbs 5 oz)
REC OUT . . . . . . . . . . . . . . . . . . . . . . . . . . 165 mV/1.6 k-ohms Finish / . . . . . . . . Black color (C, R, A, B, G, E, L models)
Headphone Jack Rated Output/Output Impedance / Titanium color (R, B, G, E, L models)
Gold color (J, T, L models)
CD, etc. 1 kHz, 150 mV, 8 ohms, 0.019% THD . . . . . . . . 250 mV/680 ohms Accessories / . . . . . . . . . . . . . . . . . Remote Control x 1




DPX-1200
Frequency Response / Battery (Manganese Dry) x 2




AX-397
CD, etc. 20 Hz to 20 kHz . . . . . . . . . . . . . . . . . . . . . . 0 ± 0.5 dB * Specifications subject to change without notice.
CD/DVD DIRECT AMP ON, 10 Hz to 100 kHz . . . . . 0 ± 1.0 dB
RIAA Equalization Deviation /
PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 ± 0.3 dB
Total Harmonic Distortion (20 Hz to 20 kHz) /
PHONO MM to REC OUT (3 V) . . . . . . . . . . . . . . . . 0.003 % or less C ........ Canadian model G ........ European model
CD, etc. to SP OUT (42.5 W/8 ohms) . . . . . . . 0.009 % or less R ........ General model E ........ South European model
Signal to Noise Ratio (IHF-A Network) / T ........ Chinese model L ........ Singapore model
PHONO MM (Input shorted, 5 mV) . . . . . . . . . . 88 dB or more A ........ Australian model J ........ Japanese model
B ........ British model
CD (CD DIRECT AMP ON, Input shorted, 165mV) . . . . . . 110 dB or more
Residual Noise (IHF-A Network) /
CD DIRECT AMP ON . . . . . . . . . . . . . . . . . . . . . 35 µV or less
CD DIRECT AMP OFF . . . . . . . . . . . . . . . . . . . 100 µV or less
Channel Separation /
CD, etc. (Input 5.1 k-ohms shorted)
1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 dB or more
10 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 dB or more
Tone Control Characteristics /
BASS Boost/Cut (20 Hz) . . . . . . . . . . . . . +10 dB/-10 dB
Turnover Frequency . . . . . . . . . . . . . . . . . 350 Hz
TREBLE Boost/Cut (20 kHz) . . . . . . . . . . . . +10 dB/-10 dB
Turnover Frequency . . . . . . . . . . . . . . . . . 3.5 kHz
Continuous Loudness Control /

Attenuation (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 dB
Gain Tracking Error /
0 to -60 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 dB or less




7
AX-397




(7/8")
DIMENSIONS




21.5

390 (15-3/8")
350 (13-3/4")
18.5
(3/4")
130 (5-1/8")

151 (5-15/16")




435 (17-1/8")
21
(13/16")




Unit : mm (inch)




s INTERNAL VIEW

q w e r t y u i
AX-397




q MAIN (2) P.C.B.
w MAIN (4) P.C.B. (R, L models)
e MAIN (5) P.C.B.
r MAIN (1) P.C.B.
t MAIN (6) P.C.B.
y MAIN (3) P.C.B.
u FUNCTION (4) P.C.B.
i FUNCTION (5) P.C.B.
o FUNCTION (12) P.C.B.
!0 FUNCTION (7) P.C.B.
!1 FUNCTION (6) P.C.B.
!2 FUNCTION (1) P.C.B.
!3 FUNCTION (10) P.C.B.
!4 FUNCTION (8) P.C.B.

o !0 !1 !2
!5 FUNCTION (11) P.C.B.
!6 FUNCTION (2) P.C.B.
!7 FUNCTION (9) P.C.B.
o !3 !4 !5 !2 !6
!8 FUNCTION (3) P.C.B.




!7 !0 !1 !8
8
AX-397




s DISASSEMBLY PROCEDURES
· Remove parts in disassembly order as numbered.
· Disconnect the power cable from the AC outlet.

1. Removal of Top Cover
a. Remove 4 screws ( q ), 1 screw ( w ) and 4 screws ( q w e
e ). (Fig. 1)
b. Slide the Top Cover rearward to remove it. (Fig. 1)

2. Removal of Front Panel Unit
a. Remove the INPUT knob.
b. Remove 1 screw ( r ) and then remove the Support
Top. (Fig. 1) r
c. Remove 7 screws ( t ) and then remove the Front
Panel Unit. (Fig. 1) t
3. Removal of Plate Side
Remove 2 push rivets ( y ) and then remove the Plate
Side L/R. (Fig. 1) y
4. Removal of Sub Chassis Unit
a. Remove 1 push rivet ( u ). (Fig. 1)
b. Remove 2 screws ( i ) and then slide the Sub Chassis u
Unit forward. (Fig. 1) i
c. Loosen the harness fixture fixing the cable.
d. Remove connectors CB221, CB226, CB302, CB306,
CB532, CB581 and CB681 and then remove the Sub




DPX-1200
Chassis Unit. (Fig. 1)




AX-397
e
Top Cover
q

e
Sub Chassis Unit
w



CB681

CB581 u
t CB532 CB302

i r CB306 q
Support Top CB221
Plate Side L CB226
y
Knob
t i




Front Panel Unit
Plate Side R


y
Fig. 1


9
AX-397



5. Removal of Amp Unit
a. Remove 1 screw ( o ) attaching the Impedance o
Selector. (Fig. 2)
b. Remove 2 screws ( !0 ) attaching the Speaker Termnal. !0
(Fig. 2)
c. Remove 2 screws ( !1 ) and then remove the MAIN (4) !1
P.C.B. (Fig. 2) (R, L models only)
d. Remove 2 screws ( !2 ) and 2 screws ( !3 ). (Fig. 2) !2 !3
e. Remove connectors CB3 and CB151. (Fig. 2)
f. Remove the Amp Unit. (Fig. 2)




Impedance Selector
Amp Unit !3
CB3 !3

!2 Speaker Terminal




CB151
MAIN (4) P.C.B.

!1
o
!0
AX-397




Fig. 2




10
AX-397




s ADJUSTMENT

q CONFIRMATION OF IDLING CURRENT q
1. Right after the power is turned on, confirm that the volt-
age across the terminals of R64 (L ch) and R65 (R ch)
are between 0.1mV to 10.0mV.
2. If the measured voltage exceeds 10.0mV, open (cut off)
R51 (L ch), R52 (R ch) and reconfirm the voltage.
3. Confirm that the voltage is between 0.25mV and 30.0mV
after 60 minutes.




R64 (L ch) Cut
R65 (R ch)




0.1mV­10mV R51 (L ch)
R52 (R ch)




DPX-1200
AX-397
R64 R65



R51 R52




11
AX-397




s IC DATA
IC301 : M38503G4A-101FP (FUNCTION (1) P.C.B.)
8-bit Microprocessor
VCC 1 42 P30/AN0
VREF 2 41 P31/AN1
AVSS 3 40 P32/AN2
P44/INT3/PWM 4 39 P33/AN3
P43/INT2/SCMP2 5 38 P34/AN4
P42/INT1 6 37 P00/SIN2
P41/INT0 7 36 P01/SOUT2
P40/CNTR1 8 35 P02/SCLK2
P27/CNTR0/SRDY1 9 34 P03/SRDY2
P26/SCLK1 10 33 P04/(AN5)
P25/TXD 11 32 P05/(AN6)
P24/RXD 12 31 P06/(AN7)
P23 13 30 P07/(AN8)
P22 14 29 P10/(LED0)
CNVSS 15 28 P11/(LED1)
P21/XCIN 16 27 P12/(LED2)
P20/XCOUT 17 26 P13/(LED3)
RESET 18 25 P14/(LED4)
XIN 19 24 P15/(LED5)
XOUT 20 23 P16/(LED6)
VSS 21 22 P17/(LED7)




No. Port Name I/O Function
1 VCC MCU Power Supply, +5V
2 VREF MCU AD Reference
3 AVSS MCU AD Ground
4 P44/INT3/PWM PD I Power Down Detect
5 P43/INT2/SCMP2 TPM/PD I Tape Monitor /Pure Direct SW
6 P42/INT1 PS I SYSTEM Power SW
7 P41/INT0 REM I Remote Control (Wake up)
8 P40/CNTR1 PRINH I Release the Protection
AX-397




9 P27/CNTR0//SRDY1 CEI O Chip Enable (INPUT SEL)
10 P26/SCLK1 CK O Clock
11 P25/TXD DATA O Data
12 P24/RXD TMO/DEST O/I Tape Monitor (397)/Destination Distinction (497)
13 P23 VRUP O Motor Volume (UP)
14 P22 VRDN O Motor Volume (DOWN)
15 CNVSS CNVSS MCU Vss: when single chip mode is used, Vcc: when flash writing is used
16 P21/XCIN D43 I AX-497/397 Detect
17 P20/XCOUT CDM O CD Direct Mute
18 /RESET MCU Reset
19 XIN MCU Oscillator In
20 XOUT MCU Oscillator Out
21 VSS MCU Ground
22 P17/(LED7) LEDA O LED (AUX)
23 P16/(LED6) LEDTP O LED (TAPE)
24 P15/(LED5) LEDM O LED (MD)
25 P14/(LED4) LEDC O LED (CD)
26 P13/(LED3) LEDT O LED (TUNER)
27 P12/(LED2) LEDP O LED (PHONO)
28 P11/(LED1) LSBY O LED (POWER)
29 P10/(LED0) LEDCDD O LED (CD DIRECT)
30 P07(AN8) LEDTM/PD O LED (TAPE MONITOR/PURE DIRECT)
31 P06(AN7) ENL I Rotary Encoder (Left)
32 P05(AN6) ENR I Rotary Encoder (Right)
33 P04(AN5) MUTE O Mute
34 P03//SRDY2 CDD I CD Direct SW
35 P02/SCLK2 PRI I Protection (Overload)
36 P01/SOUT2 RYSP O Speaker Relay
37 P00/SIN2 RYPS O Power Relay
38 P34/AN4 PRDC I Protection (DC)
39 P33/AN3 PRPS I Protection (Power Supply)
40 P32/AN2 THMR I Protection (Temperature Detection)
41 P31/AN1 THML I Protection (Temperature Detection)
42 P30/AN0 REC I Rec Out Selector Detect


12
CD/DVD DIRECT AMP
CD/DVD DIRECT AMP
SW301
IC502 Q451,452 POWER AMP
ON VR421 Q5--30
CD/DVD 10dB IC531,532 ON RY2
IC302 Q1,2
LOUDNESS SP A
OFF 10dB BALANCE
­10dB RY3
TONE CONTROL OFF 31.8dB
VR531­534 SP B
PHONO EQ AMP RY1
IC501 CD-D M
MUTE PHONES
PHONO MOTOR IC421 MAIN
INPUT DRIVER MUTE
SELECTOR
Main VR
s BLOCK DIAGRAM




IC452
A LB
RYSP
TUNER B

SW581

AUX CDD
Q26
Q27
TAPE TAPE MONITOR
SW302 D15­18
IN + Q25
TAPE
MONITOR 15 Q3
TAPE IC453
+
OUT ­15 Q4
IC456
TAPE SW4
MD B RY151
INH + D20
IN IC452

MD
OUT CD-D MAIN +
MUTE MUTE
­B
XL301 D19
4MHz LB
Q303 Q305 +

T151 SW681




Protection
TAPE
CDD
D153­156




Main VR




SERIAL DATA
(Input Select)
12S
+ POWER
19 20 11 13,14 35,38­41 5 34 17 33 36 RYSP
Microprocessor IC301
37 RYPS Q151
6 7 31,32 12
(Power ON/OFF)


STANDBY Remote Control Input Select Tape Monitor RYPS
/ON U631 SW622
SW621
AX-397




13
DPX-1200
AX-397
AX-397




s PIN CONNECTION DIAGRAM

q ICs

LM61CIZ NJM2068MD-TE2 NJU7312AM M38503G4A-101FP LB1641 TC4053BP


22
16

21
5 10
15
42 8
8 30
3: GND 4 16
2: Vout 1: +Vs 1 1
1 1 1




q Transistors

2SA933AS (R, S) 2SA970 (GR, BL) 2SA1358 (O, Y)
2SD1915F (S, T) 2SA1015 (Y) 2SC3421 (O, Y)
2SC1704S (Q, R, S) 2SA1145 (O, Y)
2SC1815 (Y)
2SC2705 (O, Y)
2SC2N5551C-AT
2SA2N5401C-AT
B
E
C C
E B EC
B


2SA1095 (O, P, Y)
2SC4488 (S, T) 2SB1274 (Q, R, S) 2SC4468 (O, P, Y)
2SA1037K (Q, R, S) 2SD1913 (R, S) 2SC4466 (O, P, Y)
DTC114EKA
DTC144EKA


C

E B B
C B C
B E CE E




q Diodes
AX-397




1SS133 1SS355 S4VB20
1SS139 MA8039-L
1SS140 MA8047-L
1SS176 MA8051-M
1SS270A Anode MA8062-M
HZS12B2TD MA8068-L Anode
HZS162TD MA8091-H


Cathode Cathode




14
A B C D E F G H
AX-397


s PRINTED CIRCUIT BOARD (Foil side)
1

FUNCTION (1) P.C.B. (Side A) FUNCTION (1) P.C.B. (Side B) Lead Free Solder Used


FUNCTION (8) FUNCTION (4) 1
FUNCTION (3) P.C.B. CB601 W451 2 CH1

(Side B) Lead Free Solder Used


MAIN (3)
CB201 2 CH2
21 1



2
22 42




3
FUNCTION (11) MAIN (5) CB221
FUNCTION (3) P.C.B. CB641
MAIN (6) CB226
(Side A)
FUNCTION (2) P.C.B. 8 5


(Side A)
1 4
1 10

FUNCTION (6) CB531




4




CD/DVD DIRECT AMP TAPE MONITOR




VOLUME
Point w
Point q (Pin 20 of IC301)
CH 1 : Emitter of Q309
5 CH 2 : Collector of Q304





AC POWER ON AC POWER OFF AC POWER ON
(Connect the power cable) (Disconnect the power cable) (Connect the power cable)



15
6
A B C D E F G H
AX-397


s PRINTED CIRCUIT BOARD (Foil side)
1

FUNCTION (5) P.C.B. FUNCTION (5) P.C.B.
(Side A) (Side B) Lead Free Solder Used



CD/DVD




8
1
4



5
2




1


8
5
4
PHONO




3

FUNCTION (4) P.C.B. FUNCTION (4) P.C.B.
(Side A) (Side B) Lead Free Solder Used




TUNER



IN




15
16
4
TAPE

OUT




30




1
FUNCTION (1)




IN
CB302




MD
8
1




OUT
9
16




AUX

5




16
6
A B C D E F G H
AX-397


s PRINTED CIRCUIT BOARD (Foil side)
1

FUNCTION (6) P.C.B. FUNCTION (6) P.C.B.
(Side A) (Side B) Lead Free Solder Used
MAIN (1)
W2




4 1




FUNCTION (1) CB304 8 5
5 8



2
1 4




BASS TREBLE BALANCE LOUDNESS
3



FUNCTION (8) P.C.B.
(Side A)
FUNCTION (1)
CB305

FUNCTION (7) P.C.B.
(Side A)
MAIN (1) FUNCTION (10)
CB1 CB631

4

PHONO TUNER CD/DVD TAPE MD AUX




FUNCTION (8) P.C.B.
(Side B) Lead Free Solder Used
B A
5
SPEAKERS
PHONES




17
6
A B C D E F G H
AX-397


s PRINTED CIRCUIT BOARD (Foil side)
1

FUNCTION (9) P.C.B. FUNCTION (10) P.C.B. FUNCTION (11) P.C.B.
(Side A) (Side A) (Side A)
TAPE MONITOR CD/DVD DIRECT AMP


STANDBY
FUNCTION (1)
CB303
FUNCTION (8)
STANDBY CB603
/ON

2
INPUT




FUNCTION (9) P.C.B. FUNCTION (10) P.C.B. FUNCTION (12) P.C.B.
(Side B) Lead Free Solder Used (Side B) Lead Free Solder Used (Side A)

POWER
3




4


MAIN (2)
W151




5




18
6
A B C D E F G H
AX-397


s PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used
1

MAIN (3) P.C.B.
(Side A)




MAIN (1) P.C.B. FUNCTION (1)
CB306
(Side A)
2




Q24A Q24C




SPEAKERS
A
B


3
R




FUNCTION (6)
CB532




L



4



MAIN (2)
CB151
Q23A Q23C




IMPEDANCE
SELECTOR

5

FUNCTION (7)
CB581

MAIN (1)
Circuit No. R, T, A, B, G, E, L C, J
C48­55 O X POWER TRANSFORMER
R98, 99 O X
X: NOT USED
O: USED/APPLICABLE