Yamaha RX-397 User manual

SERVICE MANUAL
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.
IMPORTANT NOTICE
100978
SERVICE MANUAL
STEREO RECEIVER
AMP ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 16
IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17–18
DISPLAY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PIN CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . 20
PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 21–27
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . 29–31
REMOTE CONTROL RAX16 . . . . . . . . . . . . . . . . . . 33
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34–42
■ CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 2
IMPEDANCE SELECTOR . . . . . . . . . . . . . . . . . . . . . . 3
FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
REMOTE CONTROL PANEL . . . . . . . . . . . . . . . . . . . 5
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 8
SELF DIAGNOSIS FUNCTION . . . . . . . . . . . . . . . 9–15
DPX-1200
RX-397
RX-397
© 2005 YAMAHA CORPORATION. All rights reseved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
’05.11

2
RX-397
RX-397
■ TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked Z
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.
AC LEAKAGE
TESTER OR
EQUIVALENT
EQUIPMENT
UNDER TEST
INSULATING
TABLE
WALL
OUTLET
●Leakage current must not exceed 0.5mA.
●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 REASON 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.
About Lead Free Solder
The P.C.B.s installed in this unit are soldered using the following solder.
“CAUTION”
“F251, F252 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 5A, 125V FUSE.”
CAUTION
F251, F252 : REPLACE WITH SAME TYPE 5A, 125V FUSE.
ATTENTION
F251, F252 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 5A, 125V.
AV
 
  
  
  
Side A
Side B
SMT REFLOW Process
MI FLOW Process
Solder Dip
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:
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.

3
RX-397
DPX-1200
RX-397
■IMPEDANCE SELECTOR
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.
IMPEDANCE SELECTOR
■FRONT PANEL

4
RX-397
RX-397
■REAR PANELS
▼ U, C models
▼ R model
▼ A model

5
RX-397
DPX-1200
RX-397
▼ G, E models
▼ L model
■REMOTE CONTROL PANEL
▼ RAX16

6
RX-397
RX-397
■SPECIFICATIONS
AUDIO SECTION
Minimum RMS Output Power (Power Amp. Section)
L/R, 20 Hz to 20 kHz, 0.04% THD, 8 ohms
. . . . . . .
50 W + 50 W
Dynamic Power Per Channel (IHF)
8/6/4/2 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . 70/77/89/100 W
Maximum Power Per Channel (G, E models)
1 kHz, 0.7 % THD, 4 ohms . . . . . . . . . . . . . . . . . . . . . . . . . 55 W
IEC Power (G, E models)
1 kHz, 0.04% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . . . 52 W
Maximum Power (EIAJ) (R, L moels)
1 kHz, 10% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . 85 W
Power Band Width
L/R, 0.08% THD, 22.5 W, 8 ohms . . . . . . . . . . 10 Hz to 50 kHz
Damping Factor
20 Hz to 20 kHz, SPEAKER-A, 8 ohms . . . . . . . . . 150 or more
Input Sensitivity/Input Impedance
PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 mV/47 k-ohms
CD, etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mV/47 k-ohms
Maximum Input Signal
PHONO MM, 1kHz, 0.04 % THD . . . . . . . . . . . . . . . . . .115 mV
CD, etc., 1kHz, 0.04 %THD . . . . . . . . . . . . . . . . . . . . . . . 2.2 V
Output Level/Output Impedance
REC OUT . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mV/1.2 k-ohms
Headphone Jack Rated Output/Output Impedance
CD, etc.1 kHz, 150 mV, 8 ohms, 0.04% THD . . . . . . . . . . 0.47 V/330 ohms
Frequency Response
CD, etc.20 Hz to 20 kHz . . . . . . . . . . . . . . . . . . . . . . 0 ±0.5 dB
CD, etc.PURE DIRECT ON, 10 Hz to 100 kHz
. . . . . . . . . . . .0 ±1.0 dB
RIAA Equalization Deviation
PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 ±0.5 dB
Total Harmonic Distortion (20 Hz to 20 kHz)
PHONO MM to REC OUT (3 V) . . . . . . . . . . . . . . . . . 0.02 % or less
CD, etc.to SP OUT (35 W/8 ohms) . . . . . . . . . . 0.02 % or less
Signal to Noise Ratio (IHF-A Network)
PHONO MM (Input shorted, 5 mV) . . . . . . . . . . 82 dB or more
CD, etc.(Input shorted, 150mV) . . . . . . . . . . . 108 dB or more
Residual Noise (IHF-A Network)
PURE DIRECT ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 µV
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 (50 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
GainTracking Error
0 to -60 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 dB or less
GENERAL
Power Supply
U, C models . . . . . . . . . . . . . . . . . . . . . . . . . . AC 120 V, 60 Hz
R model . . . . . . . . . . . . . AC 110/120/220/230-240 V, 50/60 Hz
A model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 240 V, 50 Hz
G, E models . . . . . . . . . . . . . . . . . . . . . . . . . . AC 230 V, 50 Hz
L model . . . . . . . . . . . . . . . . . . . . AC 220/230-240V, 50/60 Hz
Power Consumption (reference) . . . . . . . . . . . . . . . . . . 130 W
Standby Power Consumption . . . . . . . . . . . . . . . . . . . . . 0.1 W
Maximum Power Consumption (R moel)
1 kHz, 8 ohms, 10%THD . . . . . . . . . . . . . . . . . . . . . . . 300 W
AC Outlet
2 Switched Outlet
R model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 W Max. total
U, C, G, E, L models . . . . . . . . . . . . . . . . . . 100 W Max. total
1 Switched Outlet
A models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 W Max.
Dimensions (W x H x D) . . . . . . . . . . . . . . 435 x 151 x 308 mm
(17-1/8" x 5-15/16" x 12-1/8")
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.4 kg (16 lbs 5 oz)
Finish . . . . . . . . . . . . . . Black Color (U, C, R, A, G, E, L models)
Titanium Color (G, E, L models)
Accessories . . . . . . . . . . . . . . . . . . . . . . . . Remote Control x 1
Battery (AAA, R03, UM-4) x 2
Indoor FM Antenna x 1
AM Loop Antenna x 1
* Specifications subject to change without notice.
U ........ USA model
C ........ Canadian model
R ........ General model
A ........ Australian model
G ........ European model
E ........ South European model
L ........ Singapore model
FM SECTION
Tuning Range
U, C models . . . . . . . . . . . . . . . . . . . . . . . . . 87.5 to 107.9 MHz
R, L models . . . . . . . . . . . . 87.5 to 108.0/87.50 to 108.00 MHz
A, G, E models . . . . . . . . . . . . . . . . . . . . . 87.50 to 108.00 MHz
50 dB Quieting Sensitivity (IHF)
1 kHz 100% MOD.
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 µV (17.3 dBf)
Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 µV (39.2 dBf)
Usable Sensitivity (IHF)
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 µV (11.2 dBf)
Selectivity
at 400 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB
Signal to Noise Ratio (IHF)
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 dB
Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB
Harmonic Distortion (1 kHz)
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 %
Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 %
Stereo Separation (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . 45 dB
Frequency Response
20 Hz to 15 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.5/-2.0 dB
Antenna Input . . . . . . . . . . . . . . . . . . . . . . 75 ohms unbalanced
AM SECTION
Tuning Range
U, C models . . . . . . . . . . . . . . . . . . . . . . . . . . . 530 to 1710 kHz
R, L models . . . . . . . . . . . . . . . . . 530 to 1710/531 to 1611 kHz
A, G, E models . . . . . . . . . . . . . . . . . . . . . . . . 531 to 1611 kHz
Usable Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 µV/m
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loop antenna

7
RX-397
DPX-1200
RX-397
Unit : mm (inch)
DIMENSIONS
■INTERNAL VIEW
435 (17-1/8")
151 (5-15/16")
130 (5-1/8") 267 (10-1/2")21
(13/16") 18.5
(3/4") 22.5
(7/8")
308 (12-1/8")
qw
er t yuio!0
!3!2!1
!5
!3!4
!9!7!1 !2 !8!6
qOPERATION (12) P.C.B. (A, G, E, L models)
wMAIN (4) P.C.B. (R, L models)
eMAIN (2) P.C.B.
rMAIN (3) P.C.B.
tMAIN (1) P.C.B.
yMAIN (5) P.C.B.
uFUNCTION (4) P.C.B.
iFUNCTION (1) P.C.B.
oFUNCTION (2) P.C.B.
!0 OPERATION (13) P.C.B.
!1 OPERATION (10) P.C.B.
!2 OPERATION (3) P.C.B.
!3 OPERATION (2) P.C.B.
!4 OPERATION (1) P.C.B.
!5 OPERATION (8) P.C.B.
!6 OPERATION (5) P.C.B.
!7 OPERATION (7) P.C.B.
!8 OPERATION (4) P.C.B.
!9 OPERATION (9) P.C.B.

8
RX-397
RX-397
■DISASSEMBLY PROCEDURES
•Remove parts in disassembly order as numbered.
•Disconnect the power cable from the AC outlet.
Fig. 1
1. Removal of Top Cover
a. Remove 4 screws ( q ), 1 screw ( w ) and 4 screws (
e ). (Fig. 1)
b. Slide the Top Cover rearward to remove it. (Fig. 1)
2. Removal of Front Panel Unit
a. Remove 5 knobs (INPUT, BASS, TREBLE, BALANCE
and LOUDNESS).
b. Remove 1 screw ( r ) and then remove the Support
Top. (Fig. 1)
c. Remove 7 screws ( t ) and then remove the Front
Panel Unit. (Fig. 1)
3. Removal of Plate Side
Remove 2 push rivets ( y ) and then remove the Plate
Side L/R. (Fig. 1)
4. Removal of Sub Chassis Unit
a. Remove 2 screws ( u ) and then slide the Sub Chassis
Unit forward. (Fig. 1)
b. Loosen the harness fixture fixing the cable.
c. Remove connectors CB103, CB401, CB404, CB606
and CB611 and then remove the Sub Chassis Unit.
(Fig. 1)
q
q
w
e
r
t
t
y
y
u
u
Knob
Knob
Top Cover
Sub Chassis Unit
Plate Side L
Plate Side R
CB404
CB103
CB606
CB611
CB401
Support Top
Front Panel Unit

9
RX-397
DPX-1200
RX-397
■SELF DIAGNOSIS FUNCTION
This product has a built-in self diagnosis function (DIAG) to facilitate inspection, measurement and determination of a faulty
item, if any.There are 8 DIAG menu items, each having sub-menu items.
No. DIAG menu Sub-menu
1 DISPLAY CHECK 1.VFD CHECK (Initial display
2.VFD DISP OFF (All segments OFF)
3.VFD DISP ALL (All segments ON 100%)
4.VFD DIMMER (All segments ON 50%)
5. CHECKED PATTERN (ON in lattice)
2 FACTORY PRESET 1. PRESET INHI (memory initialization inhibited
2. PRESET RSRV (memory initialized
3 AD DATA CHECK 1. DC/PS (protection)
2.THM L, R
3. REC-OUT (No applied to this model
4. K0 / K1 (panel key)
4 XM STATUS 1. XMS1 (No applied to this model
2. XMS2 (No applied to this model
5 PROTECTION SETTING 1. PS_Lo :
2. PS_Hi :
3. DC_Lo :
4. DC_Hi :
5.TEMP :
6 PROTECTION HISTORY 1. history 1
2. history 2
3. history 3
4. history 4
7 SOFT SWITCH 1. SW MODE : PCB (/MODEL/FNC)
2. MODEL SETTING : RX397 (/RX797/RX497)
3. DESTINATION : UC (/RL/A/BG)
4.TUNER DESTINATION : (/RL/ABG)
5.TUNERTYPE : NRM (/RDS/XM)
6. ZONE2 : EXIST (/NOT) (No applied to this model
8
MICROPROCESSOR INFORMATION 1.VERSION
2. CHECK SUM
3. OPE / XM
4. PORT
5. EE SUM

10
RX-397
RX-397
●Starting DIAG
Press the “STANDBY/ON” key of the main unit while simul-
taneously pressing the “FM/AM” key and the “8” key to acti-
vate the DIAG function.
Turn on the power while pressing these keys.
●Starting DIAG in the protection cancel
mode
If the protection function works and causing hindrance to
trouble diagnosis, cancel the protection function as de-
scribed below and it will be possible to enter the DIAG mode.
(The protection functions other than the excess current
detect function will be disabled.)
Press the “STANDBY/ON” key while simultaneously press-
ing those two keys indicated in the figure above. At this
time, keep pressing those two keys for 3 seconds or longer.
In this mode, the “SLEEP” segment of the FL display of the
main unit flashes to indicate that the mode is DIAG mode
with the protection functions disabled.
CAUTION!
Using this product with the protection function disabled
may cause damage to itself. Use special care for this point
when using this mode.
●Canceling DIAG
1 Before canceling DIAG, execute setting for PRESET of
DIAG menu No.2 (Memory initialization inhibited or
Memory initialized).
* In order to keep the user memory stored, be sure to se-
lect PRESET INHIBITED (Memory initialization inhibited).
Protection history will remain in memory.
2 Turn off the power by pressing the “STANDBY/ON” key
of the main unit.
When there is a history of protection function:
The FL display appears as shown below depending on the
type of the protection function.
The protection function worked due to excessive current
through the amplifier.The protection function activates im-
mediately to turn off the power, with no history display at
turn-on, if the amplifier is defective.
●Display provided when DIAG started
On the FL display of the main unit, an opening mes-
sage (including the version and the protection history)
appears for a few seconds followed by the diagnostic
menu display (1.VFD CHECK).
After a few seconds.
Version (1 alphabet)
When there is no protection history.
When there is no history of protection function:
Opening message
NO PROTECT Z
1. VFD CHECK
I PROTECT Z
DIAG menu display
The protection function worked due to a defect or overload
in the power supply.The abnormal voltage is displayed in
% based on 5V as 100%. If the power is turned on with the
abnormality unsolved, the protection function works in about
1 second to turn off the power.
PS PRT :000 Z