Text preview for : Yamaha RX-797.pdf part of Yamaha receiver



Back to : Yamaha RX-797.pdf | Home

STEREO RECEIVER

RX-797 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.




s CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 2 IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17­18
IMPEDANCE SELECTOR . . . . . . . . . . . . . . . . . . . . . . 3 DISPLAY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
FRONT PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 20­28
REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4­5 PIN CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . 29
REMOTE CONTROL PANELS . . . . . . . . . . . . . . . . . . 5 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 6­7 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . 31­34
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35­43
DPX-1200
RX-797




DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 8 REMOTE CONTROL RAX100/RAX101 . . . . . . . . . . 44
SELF DIAGNOSIS FUNCTION . . . . . . . . . . . . . . . 9­15 REMOTE CONTROL RAX17 . . . . . . . . . . . . . . . . . . 45
AMP ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 16 REMOTE CONTROL RAX18 . . . . . . . . . . . . . . . . . . 46




© 2005 YAMAHA CORPORATION. All rights reseved.
100979 This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.

'05.10
RX-797




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"
"F251, F252 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A, 125V FUSE."
A V
CAUTION
F251, F252 : REPLACE WITH SAME TYPE 8A, 125V FUSE.
ATTENTION
F251, F252 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 8A, 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
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.




Among some types of lead free solder currently available, it
Side A SMT REFLOW Process
is recommended to use one of the following types for the
repair work.
· Sn + Ag + Cu (tin + silver + copper)
Solder Dip · Sn + Cu (tin + copper)
RX-797




Side B · Sn + Zn + Bi (tin + zinc + bismuth)
MI FLOW Process


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.

2
RX-797




s 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




s FRONT PANELS
w U, C models




w R, A, G, E, L models

DPX-1200
RX-797




3
RX-797




s REAR PANELS
w U, C models




w R model




w A model
RX-797




4
RX-797




w G, E models




w L model




s REMOTE CONTROL PANELS
w RAX100 w RAX101 w RAX17 w RAX18
(U, C models) (R, A, G, E, L models) (U, C models) (R, A, G, E, L models)




DPX-1200
RX-797




5
RX-797




s SPECIFICATIONS
AUDIO SECTION VIDEO SECTION
Minimum RMS Output Power (Power Amp. Section) Video Signal Type
L/R, 20 Hz to 20 kHz, 0.019% THD, 8 ohms . . . . 100 W + 100 W U, C, R models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NTSC
L/R, 20 Hz to 20 kHz, 0.03% THD, 6 ohms . . . . . 120 W + 120 W A, G, E, L models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAL
Dynamic Power Per Channel (IHF) Video Signal Level . . . . . . . . . . . . . . . . . . . . . 1 Vp-p/75 ohms
8/6/4/2 ohms . . . . . . . . . . . . . . . . . . . . . . . 140/170/220/290 W Video Maximum Input Level . . . . . . . . . . . . . . 1.5 Vp-p or more
Maximum Power Per Channel (G, E models) Video Signal to Noise Ratio . . . . . . . . . . . . . . . . 50 dB or more
1 kHz, 0.7 % THD, 4 ohms . . . . . . . . . . . . . . . . . . . . . . . . 160 W Monitor Out Frequency Response . . . . 5 Hz to 10 MHz, -3 dB
IEC Power (G, E models)
1 kHz, 0.019% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . 115 W
Maximum Power (EIAJ) (R, L models) FM SECTION
1 kHz, 10% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . . . . 145 W Tuning Range
1 kHz, 10% THD, 6 ohms . . . . . . . . . . . . . . . . . . . . . . . . . 170 W U, C models . . . . . . . . . . . . . . . . . . . . . . . . . 87.5 to 107.9 MHz
Power Band Width R, L models . . . . . . . . . . . . 87.5 to 108.0/87.50 to 108.00 MHz
L/R, 0.03% THD, 50 W, 8 ohms . . . . . . . . . . . . 10 Hz to 50 kHz A, G, E models . . . . . . . . . . . . . . . . . . . . . 87.50 to 108.00 MHz
Damping Factor 50 dB Quieting Sensitivity (IHF)
20 Hz to 20 kHz, SPEAKER-A, 8 ohms . . . . . . . . . 240 or more 1 kHz 100% MOD.
Input Sensitivity/Input Impedance Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 µV (17.3 dBf)
PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 mV/47 k-ohms Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 µV (39.2 dBf)
CD, etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mV/47 k-ohms Usable Sensitivity (IHF)
MAIN IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/30 k-ohms Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 µV (11.2 dBf)
Maximum Input Signal Selectivity
PHONO MM, 1kHz, 0.019 % THD . . . . . . . . . . . . . . . . . . 70 mV at 400 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB
CD, etc., 1kHz, 0.019 % THD . . . . . . . . . . . . . . . . . . . . . . 2.2 V Signal to Noise Ratio (IHF)
Output Level/Output Impedance Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 dB
SUBWOOFER . . . . . . . . . . . . . . . . . . . . . . . . . . 4 V/1.2 k-ohms Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB
PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/1.2 k-ohms Harmonic Distortion (1 kHz)
ZONE2 OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/1.2 k-ohms Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 %
REC OUT . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mV/1.2 k-ohms Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 %
Headphone Jack Rated Output/Output Impedance Stereo Separation (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . 45 dB
CD, etc. 1 kHz, 200 mV, 8 ohms, 0.015% THD . . . . . . . . . 0.47 V/470 ohms Frequency Response
Frequency Response 20 Hz to 15 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.5/-2.0 dB
CD, etc. 20 Hz to 20 kHz . . . . . . . . . . . . . . . . . . . . . . 0 ± 0.5 dB Antenna Input . . . . . . . . . . . . . . . . . . . . . . 75 ohms unbalanced
MAIN IN, 20 Hz to 20 kHz . . . . . . . . . . . . . . . . . . . . . 0 ± 0.5 dB
CD, CD DIRECT AMP ON, 10 Hz to 100 kHz . . . . . . . . . . . . . 0 ± 1.0 dB AM SECTION
RIAA Equalization Deviation Tuning Range
PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 ± 0.5 dB U, C models . . . . . . . . . . . . . . . . . . . . . . . . . . . 530 to 1710 kHz
Total Harmonic Distortion (20 Hz to 20 kHz) R, L models . . . . . . . . . . . . . . . . . 530 to 1710/531 to 1611 kHz
PHONO MM to REC OUT (3 V) . . . . . . . . . . . . . . . . 0.008 % or less A, G, E models . . . . . . . . . . . . . . . . . . . . . . . . 531 to 1611 kHz
CD, etc. to PRE OUT (1V) . . . . . . . . . . . . . . . . 0.007 % or less Usable Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 µV/m
CD, etc. to SP OUT (50 W/8 ohms) . . . . . . . . . 0.012 % or less Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loop antenna
Signal to Noise Ratio (IHF-A Network)
PHONO MM (Input shorted, 5 mV) . . . . . . . . . . 87 dB or more
CD, CD DIRECT AMP ON,(Input shorted, 200mV) . . . . . . 110 dB or more GENERAL
Residual Noise (IHF-A Network) Power Supply
CD DIRECT AMP ON . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 µV U, C models . . . . . . . . . . . . . . . . . . . . . . . . . . AC 120 V, 60 Hz
PURE DIRECT ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 µV R model . . . . . . . . . . . . . AC 110/120/220/230-240 V, 50/60 Hz
Channel Separation A model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 240 V, 50 Hz
CD, etc. (Input 5.1 k-ohms shorted) G, E models . . . . . . . . . . . . . . . . . . . . . . . . . . AC 230 V, 50 Hz
1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 dB or more L model . . . . . . . . . . . . . . . . . . . . AC 220/230-240 V, 50/60 Hz
10 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 dB or more Power Consumption
Tone Control Characteristics U, C models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 W, 360 VA
R, A, G, E, L models . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 W
RX-797




BASS Boost/Cut (50 Hz) . . . . . . . . . . . . . +10 dB/-10 dB
Turnover Frequency . . . . . . . . . . . . . . . . . 350 Hz Standby Power Consumption (reference) . . . . . . . . . . . . 0.1 W
TREBLE Boost/Cut (20 kHz) . . . . . . . . . . . . +10 dB/-10 dB Maximum Power Consumption (R model)
Turnover Frequency . . . . . . . . . . . . . . . . . 3.5 kHz 1 kHz, 6 ohms, 10% THD . . . . . . . . . . . . . . . . . . . . . . . 650 W
Continuous Loudness Control AC Outlet
Attenuation (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 dB 2 Switched Outlet
Gain Tracking Error R model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 W Max. total
0 to -60 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 dB or less U, C, G, E, L models . . . . . . . . . . . . . . . . . . 100 W Max. total
1 Switched Outlet
A models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 W Max.

6
RX-797




DIMENSIONS




(7/8")
Dimensions (W x H x D) . . . . . . . . . . . . . . 435 x 151 x 389 mm




21.5
(17-1/8" x 5-15/16" x 15-5/16")
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.9 kg (24 lbs)
Finish . . . . . . . . . . . . . . . . Black color (U, C, R, A, G, E, L moels)
Titanium color (G, E, L moels)
Accessories . . . . . . . . . . . . . . . . . . . . . . . . Remote Control x 1
Zone2 Remote Control x 1




389 (15-1/16")
349 (13-3/4")
Battery (AA, R6, UM-3) x 2
Battery (AAA, R03, UM-4) x 2
Power Cable x 1
Indoor FM Antenna x 1
AM Loop Antenna x 1
* Specifications subject to change without notice.

U ........ USA model G ........ European model
C ........ Canadian model E ........ South European model
R ........ General model L ........ Singapore model




18.5
(3/4")
A ........ Australian model




130 (5-1/8")

151 (5-15/16")
© 2005 XM Satellite Radio Inc. All rights reserved. All other
trademarks are the property of their respective owners.


435 (17-1/8")




21
(13/16")
Unit : mm (inch)
s INTERNAL VIEW
q w er t y u i o !0 !1 q MAIN (2) P.C.B.
w MAIN (3) P.C.B.
e MAIN (8) P.C.B.
r MAIN (4) P.C.B.
t MAIN (5) P.C.B. (R, L models)
y MAIN (1) P.C.B.
u XM P.C.B. (U, C models)
i FUNCTION (4) P.C.B.
!2 o FUNCTION (5) P.C.B.
!3 !0 FUNCTION (3) P.C.B.
!1 OPERATION (13) P.C.B.
!2 FUNCTION (2) P.C.B.
!3 FUNCTION (1) P.C.B.
!4 OPERATION (6) P.C.B.
!5 OPERATION (10) P.C.B.
!6 MAIN (7) P.C.B.
!4 !5 !6 !7 !8 !9 !7 OPERATION (3) P.C.B.
!8 MAIN (6) P.C.B.
!4 @0 @1 !9 @2 @3 !9 OPERATION (2) P.C.B.
DPX-1200
RX-797




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


7
RX-797




s DISASSEMBLY PROCEDURES

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


1. Removal of Top Cover 3. Removal of Plate Side
a. Remove 4 screws ( q ), 1 screw ( w ) and 4 screws ( Remove 2 push rivets ( y ) and then remove the Plate
e ). (Fig. 1) Side L/R. (Fig. 1)
b. Slide the Top Cover rearward to remove it. (Fig. 1)
4. Removal of Sub Chassis Unit
2. Removal of Front Panel Unit a. Remove 2 screws ( u ) and then slide the Sub Chassis
a. Remove 6 knobs (INPUT, REC OUT, BASS, TREBLE, Unit forward. (Fig. 1)
BALANCE, LOUNESS). b. Loosen the harness fixture fixing the cable.
b. Remove 1 screw ( r ) and then remove the Support c. Remove connectors CB283, CB401, CB404, CB407,
Top. (Fig. 1) CB503 and CB606 and then remove the Sub Chassis
c. Remove 7 screws ( t ) and then remove the Front Unit. (Fig. 1)
Panel Unit. (Fig. 1)




1
Top Cover
3

2


Sub Chassis Unit


Front Panel Unit CB401
CB404
5 7
CB407 1
CB283 CB503
4
Support Top

Knob 6
7
Plate Side L
Knob
Knob CB606

5

Plate Side R 6
Fig. 1
RX-797




8
RX-797




s 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
4. K0 / K1 (panel key)
4 XM STATUS 1. XMS1
2. XMS2
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 : RX797 (/RX497/RX397)
3. DESTINATION : UC (/RL/A/BG)
4. TUNER DESTINATION : (/RL/ABG)
5. TUNER TYPE : NRM (/RDS/XM)
6. ZONE2 : EXIST (/NOT)
8 MICROPROCESSOR INFORMATION 1. VERSION
2. CHECK SUM
3. OPE / XM
4. PORT
5. EE SUM




DPX-1200
RX-797




9
RX-797



q Starting DIAG q Display provided when DIAG started
Press the "MASTER" key of the main unit while simulta- On the FL display of the main unit, an opening mes-
neously pressing the "FM/AM" key and the "8" key to acti- sage (including the version and the protection history)
vate the DIAG function. appears for a few seconds followed by the diagnostic
menu display (1. VFD CHECK).




When there is no history of protection function:

Opening message

When there is no protection history.



Turn on the power while pressing these keys. NO PROTECT Z

Version (1 alphabet)
q Starting DIAG in the protection cancel
mode
After a few seconds.
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. DIAG menu display
(The protection functions other than the excess current
1. VFD CHECK
detect function will be disabled.)
Press the "MASTER" key while simultaneously pressing
those two keys indicated in the figure above. At this time,
keep pressing those two keys for 3 seconds or longer. When there is a history of protection function:
In this mode, the "SLEEP" segment of the FL display of the The FL display appears as shown below depending on the
main unit flashes to indicate that the mode is DIAG mode type of the protection function.
with the protection functions disabled.
The protection function worked due to excessive current
CAUTION! through the amplifier. The protection function activates im-
Using this product with the protection function disabled mediately to turn off the power, with no history display at
may cause damage to itself. Use special care for this point turn-on, if the amplifier is defective.
when using this mode.

I PROTECT Z
q Canceling DIAG
1 Before canceling DIAG, execute setting for PRESET of The protection function worked due to a defect or overload
DIAG menu No.2 (Memory initialization inhibited or in the power supply. The abnormal voltage is displayed in
Memory initialized). % based on 5V as 100%. If the power is turned on with the
* In order to keep the user memory stored, be sure to se- abnormality unsolved, the protection function works in about
lect PRESET INHIBITED (Memory initialization inhibited). 1 second to turn off the power.
Protection history will remain in memory.
RX-797




2 Turn off the power by pressing the "MASTER" key of the
main unit. PS PRT :000 Z




10
RX-797



The protection function worked due to a DC voltage ap- q Operation procedure of DIAG MENU and
pearing at the speaker terminal. SUB-MENU
A cause could be a defect in the amplifier. If the power is There are 8 MENU items, each of which has some SUB-
turned on with the abnormality unsolved, the protection func- MENU items.
tion works in about 3 seconds to turn off the power.
DIAG menu selection
Select the menu using PRESET NO keys.
DC PRT :000 Z



The protection function worked due to the temperature limit
being exceeded. Causes could be poor ventillation or a de-
fect related to the thermal sensor. The abnormal voltage is
displayed in % based on 5V as 500%. If the power is turned
on with the abnormality unsolved, the protection function SUB-MENU selection
works in about 1 second to turn off the power. Select the sub-menu using w (Forward) and q (Reverse)
keys of TUNING.
TMR PRT:000 Z


TML PRT:000 Z
Reverse Forward


For detection of each protection function (except I-PRO-
TECT) , refer to DIAG MENU No.3 AD DATA CHECK (p.13).
q Functions in DIAG mode
In addition to the DIAG menu items, functions as listed
q History of protection function
When the protection function has worked, its history is stored below are available.
in memory with a backup. Even if no abnormality is noted while · Input selection
servicing the unit, an abnormality which has occurred previ- · Muting
ously can be defined as long as the backup data has been · Power on/off
stored. · Master volume
The history of the protection function is cleared when DIAG is
cancelled by selecting PRESET RESERVED (Memory initial- * Functions related to the tuner is not available.
ized) of DIAG menu No.2 or when the backup data is erased.


q Initial settings used to start DIAG
The following initial settings are used when starting
q Display during menu operation DIAG. When DIAG is canceled, these settings are re-
During the DIAG operation, the function at work is indi- stored to those before starting DIAG.
cated on the FL indicator. The contents displayed dur- · Input: DVD
ing the function operation are described later in the "De- · Audio mute: OFF
tails of DIAG menu" section. · DIAG menu: DISPLAY CHECK (1. VFD CHECK)
DPX-1200
RX-797




11
RX-797




1. DISPLAY CHECK 2. FACTORY PRESET
This program is used to check the FL display section. The This menu is used to reserve/inhibit initialization of the back-
display condition varies as shown below according to the up RAM.
sub-menu operation.


Initial display
2.PRESET INHI
PRESET INHIBIT (Initialization inhibited)
RAM initialization is not executed. Select this sub-
menu to protect the values set by the user.
All segments OFF Note: The protection history will not be erased using
PRESET INHIBIT.




All segments ON 2.PRESET RSRV
(dimmer 100%)
PRESET RESERVED (Initialization reserved)
Initialization of the back-up RAM is reserved. (Actu-
ally, initialization is executed the next time that the
All segments ON power is turned on.) Select this sub-menu to reset
(dimmer 50%) to the original factory settings or to reset the RAM.
Use PRESET RESERVED to erase the protection
history.

Lighting of segments
in lattice

CAUTION: Before setting to the PRESET RESERVED, write down
the existing preset memory
content of the Tuner in a table as shown below. (This is be-
cause setting to the PRESET RESERVED will cause ALL user
memory contents to be erased.)


Lighting in lattice Preset group P1 P2 P3 P4
A
B
C
Short Normal D
E

Preset group P5 P6 P7 P8
A
B
C
D
E
Segment conditions of the FL driver and the FL tube are
RX-797




checked by turning ON and OFF all segments. Next, the
operation of the FL driver is checked by using the dimmer
control. Then a short between segments next to each other
is checked by turning ON and OFF all segments alternately
(in lattice). (In the above example, the segments in the sec-
ond row from the top are shorted.)



12
RX-797



q PRESET STATIONS REC-OUT
STATION FM FACTORY PRESET DATA (MHz) 255% display of the voltage based on the rec-out selector
PAGE NO. U, C R, A, G, E, L detected value. Reference voltage: 5V
1 87.5 87.50 For the correct value, refer to the table below.
2 90.1 90.10
3 95.1 95.10
A/C/E 4 98.1 98.10 REC-OUT:160
5 107.9 108.00
6 88.1 88.10
7 106.1 106.10 % U, C R, A, G, E, L
8 107.9 108.00 1 22 ­ 46 DVD DVD
2 47 ­ 75 DTC/CBL DTV/CBL
STATION AM FACTORY PRESET DATA (kHz)
PAGE NO. U, C, R A, G, E, L 3 76 ­ 105 VCR VCR
1 630 630 4 106 ­ 135 MD/TAPE MD/TAPE
2 1080 1080 5 136 ­ 166 CD SOURCE
3 1440 1440 6 167 ­ 199 XM CD
B/D 4 530 531 7 200 ­ 236 TUNER TUNER
5 1710 1611 8 237 ­ 255 PHONO PHONO
6 900 900
7 1350 1350
8 1400 1404 K0/K1
This is the A/D value of the panel key input ports KEY0 and
KEY1 (microprocessor). The table below shows the A/D
value obtained when each key is pressed. When the value
3. AD DATA CHECK
is not within the standard value range, no correct operation
With this sub-menu used, the key scanning, A/D value of
is provided. Referring to the table below, check the value of
the voltage at the abnormality detect (protection) port, etc.
each voltage dividing resistor of each key, solder condition,
are displayed. The A/D conversion value is displayed in %.
etc.
The state before audio signal processing is kept.
When K0/K1 menu is selected, keys become nonoperable
K0:100 K1:099
due to detection of the values of all keys.
However, it is possible to advance to the next sub-menu by
% Key0 Key1
turning the INPUT of the main unit. When using this func-
1 0­4 FM/AM P8
tion, note that turning the INPUT more than 2 clicks will
2 4 ­ 12 TUNING DOWN P7
cause the volume value to change. 3 12 ­ 21 TUNING UP P6
* The numeric value in the diagram is for reference. 4 21 ­ 30 TUNING MODE P5
5 31 ­ 41 MEMORY P4
DC/PS (protection detection) 6 42 ­ 52 EDIT P3
DC: DC detect protection value 7 52 ­ 61 ZONE CTRL P2
Normal value: 19 to 51 (Reference: 5V = 100%) 8 61 ­ 68 SPEAKER B P1
PS: Power supply voltageprotection value 9 68 ­ 74 SPEAKER A A/B/C/D/E
10 75 ­ 81
Normal value: 54 to 84 (Reference: 5V = 100%)
11 81 ­ 89


When the value is outside of the normal range, the pro-
tection function works to turn off the power.
4. XM STATUS
XM Radio data is displayed.
DC:035 PS:067
DPX-1200
RX-797




4. XMS1xxxxxxx
THM (temperature detection)
When the value is outside of the normal range, the protec-
tion function works to turn off the power.
500% display of the voltage based on the temperature de- 4. XMS2xxxxxxx
tected value. Reference voltage: 5V


THM:L096 R098
13
RX-797




5. PROTECTION SETTING 6. PROTECTION HISTORY
This menu is used to change the protection setting value. Four protection histories are displayed.
The change is effective in this menu only. A set value can The history is cleared by the initialization reservation of DIAG
be specified between 0 ­ 255 (0V ­ 5V). menu No. 2.


Operation: When there is no history of protection function:
Change the digit with the "EDIT" key. There is no history of protection function.
UP / DOWN with the TUNING MODE / MEMORY key.
6-1 NoPRT


PS_Lo: 0138 When there is a history of protection function:
There is a history of protection function due to excess cur-
The PS protection LO level threshold value can be set. rent.
Protection operates when the voltage value of the de-
tection terminal falls below this value. 6-1 I PRT


There is a history of protection function due to abnormal
PS_Hi: 0215 voltage in the power supply section.
The PS protection HI level threshold value can be set. The abnormal voltage is displayed in % based on 5V as
Protection operates when the voltage value of the de- 100%.
tection terminal exceeds this value.
6-2 PsPRT 069


DC_Lo: 0049 There is a history of protection function due to abnormal
DC output.
The DC protection LO level threshold value can be set. The abnormal voltage is displayed in % based on 5V as
Protection operates when the voltage value of the de- 100%.
tection terminal falls below this value.
6-3 DcPRT 059

DC_Hi: 0131
There is a history of protection function excessive heatsink
The DC protection HI level threshold value can be set. temperature. (R ch)
Protection operates when the voltage value of the de- The abnormal voltage is displayed in % based on 5V as
tection terminal exceeds this value. 500%.

6-4 TmRPRT 245
TEMP : 0089
There is a history of protection function excessive heatsink
The TEMP protection HI level threshold value can be temperature. (L ch)
set. The abnormal voltage is displayed in % based on 5V as
Protection operates when the voltage value of the de- 500%.
tection terminal exceeds this value.
6-4 TmLPRT 245
RX-797




* The numeric value in the diagram is for reference.




14
RX-797




7. SOFT SWITCH 8. MICROPROCESSOR INFORMATION
The version, checksum and the port specified by the
Note) Changing the function setting may hinder the proper
microprocessor are displayed. The checksum is obtained
operation.
by adding the data at every 16 bits for each program
This menu is used to switch the function settings on P.C.B. area and expressing the result as a 4-figure hexadecimal
through the software so as to activate the product. data.
The operation mode can be changed by selecting the sub- * The numeric value in the diagram is for reference.
menu and then using the EDIT key.
The protection function follows the P.C.B. settings.
When connected to AC, the unit is initialized to the P.C.B.
setting. Display of each function after initialization varies VER. Z009
depending on settings on P.C.B. Software version of microprocessor


SW MODE: PCB, MODEL or FNC can be selected.
CHECK SUM:78E2
Checksum value of microprocessor
7.SW :PCB
OPE:06 XM:AB
MODEL SETTING: RX797, RX497 or RX397 can be se-
Software modules version of microprocessor
lected. (SW MODE: Selectable when MODEL has been se-
lected.)

7.MODEL :RX797 PORT:
The condition of ports for model detection
DESTINATION: UC / RL / A or BGE can be selected. (SW (Not applied to these models.)
MODE: Selectable when MODEL has been selected.)


7.DEST :UC EE SUM:0000
Checksum value of EEPROM
TUNER DEST INATION: UC, RL or ABGE can be selected.
(SW MODE: Selectable when FNC has been selected.)

7.TuDst :UC

TUNER TYPE: NRM, RDS or XM can be selected. (SW
MODE: Selectable when FNC has been selected.)

7.TuTyp :XM

ZONE2: NOT or EXIST can be selected. (SW MODE: Se-
lectable when FNC has been selected.)

7.ZONE2 :EXIST
DPX-1200
RX-797




Frequency Range
Tuner Dest Comment
FM AM
UC 87.5­107.9MHz/200kHz 530­1710kHz/10kHz
87.5­108.0MHz/50kHz 531­1611kHz/9kHz The frequency range is selected
RL
87.5­108.0MHz/100kHz 530­1710kHz/10kHz with Advanced Set Up
ABG 87.5­108.0MHz/50kHz 531­1611kHz/9kHz




15
RX-797




s AMP ADJUSTMENT

q CONFIRMATION OF IDLING CURRENT
1. Right after the power is turned on, confirm that the volt-
age across the terminals of R111­R135 (L ch) and R112­
R136 (R ch) are between 0.1mV to 10.0mV.
2. If the measured voltage exceeds 10.0mV, open (cut off)
R175 (L ch), R176 (R ch) and reconfirm the voltage.
3. Confirm that the voltage is between 0.20mV and 15.0mV
after 60 minutes.




0.1mV­10mV
(L ch)

0.1mV­10mV
(R ch)
R135 Cut




R136
R111 R175 (L ch)
R176 (R ch)




R112




R135 R136



R175 R176
RX-797




R111 R112




16
RX-797




s IC DATA
IC602 : M30626FHPFP (FUNCTION (2) P.C.B.)
16-bit Microprocessor




P21/A1/(/D1/D0)
P22/A2/(/D2/D1)
P23/A3/(/D3/D2)
P24/A4/(/D4/D3)
P25/A5/(/D5/D4)
P26/A6/(/D6/D5)
P27/A7/(/D7/D6)
P20/A0/(/D0/--)




P30/A8(/--/D7)
P15/D13/INT3
P16/D14/INT4
P17/D15/INT5
P12/D10

P14/D12




P32/A10

P34/A12
P35/A13
P36/A14
P37/A15
P40/A16
P41/A17
P42/A18
P43/A19
P13/D11




P33/A11
P10/D8




P31/A9
P11/D9




VCC
VSS
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
P07/D7 81 50 P44/CS0
P06/D6 82 49 P45/CS1
P05/D5 83 48 P46/CS2
P04/D4 84 47 P47/CS3
P03/D3 85 46 P50/WRL/WR
P02/D2 86 45 P51/WRH/BHE
P01/D1 87 44 P52/RD
P00/D0 88