Yamaha Rx-797 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

100979

SERVICE MANUAL

STEREO RECEIVER

IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17–18

DISPLAY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 20–28

PIN CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . 29

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . 31–34

PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–43

REMOTE CONTROL RAX100/RAX101 . . . . . . . . . . 44

REMOTE CONTROL RAX17 . . . . . . . . . . . . . . . . . . 45

REMOTE CONTROL RAX18 . . . . . . . . . . . . . . . . . . 46

■ CONTENTS

TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 2

IMPEDANCE SELECTOR . . . . . . . . . . . . . . . . . . . . . . 3

FRONT PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5

REMOTE CONTROL PANELS . . . . . . . . . . . . . . . . . . 5

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7

INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 8

SELF DIAGNOSIS FUNCTION . . . . . . . . . . . . . . . 9–15

AMP ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 16

DPX-1200

RX-797

This manual is copyrighted by YAMAHA and may not be copied or

redistributed either in print or electronically without permission.

’05.10

RX-797

■ 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 8A, 125V FUSE.”

CAUTION

F251, F252 : REPLACE WITH SAME TYPE 8A, 125V FUSE.

ATTENTION

F251, F252 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 8A, 125V.

 

  

  

  

  

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.

RX-797

DPX-1200

RX-797

■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.

■FRONT PANELS

▼ U, C models

▼ R, A, G, E, L models

IMPEDANCE SELECTOR

RX-797

■REAR PANELS

▼ U, C models

▼ R model

▼ A model

RX-797

DPX-1200

RX-797

▼ G, E models

▼ L model

■REMOTE CONTROL PANELS

▼RAX100

(U, C models) ▼RAX101

(R, A, G, E, L models) ▼RAX17

(U, C models) ▼RAX18

(R, A, G, E, L models)

RX-797

■SPECIFICATIONS

AUDIO SECTION

Minimum RMS Output Power (Power Amp. Section)

L/R, 20 Hz to 20 kHz, 0.019% THD, 8 ohms

. . . .

100 W + 100 W

L/R, 20 Hz to 20 kHz, 0.03% THD, 6 ohms

. . . . .

120 W + 120 W

Dynamic Power Per Channel (IHF)

8/6/4/2 ohms . . . . . . . . . . . . . . . . . . . . . . . 140/170/220/290 W

Maximum Power Per Channel (G, E models)

1 kHz, 0.7 % THD, 4 ohms . . . . . . . . . . . . . . . . . . . . . . . . 160 W

IEC Power (G, E models)

1 kHz, 0.019% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . 115 W

Maximum Power (EIAJ) (R, L models)

1 kHz, 10% THD, 8 ohms . . . . . . . . . . . . . . . . . . . . . . . . . 145 W

1 kHz, 10% THD, 6 ohms . . . . . . . . . . . . . . . . . . . . . . . . . 170 W

Power Band Width

L/R, 0.03% THD, 50 W, 8 ohms . . . . . . . . . . . . 10 Hz to 50 kHz

Damping Factor

20 Hz to 20 kHz, SPEAKER-A, 8 ohms . . . . . . . . . 240 or more

Input Sensitivity/Input Impedance

PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 mV/47 k-ohms

CD, etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mV/47 k-ohms

MAIN IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/30 k-ohms

Maximum Input Signal

PHONO MM, 1kHz, 0.019 % THD . . . . . . . . . . . . . . . . . .70 mV

CD, etc., 1kHz, 0.019 %THD . . . . . . . . . . . . . . . . . . . . . . 2.2 V

Output Level/Output Impedance

SUBWOOFER . . . . . . . . . . . . . . . . . . . . . . . . . . 4 V/1.2 k-ohms

PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/1.2 k-ohms

ZONE2 OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/1.2 k-ohms

REC OUT . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mV/1.2 k-ohms

Headphone Jack Rated Output/Output Impedance

CD, etc.1 kHz, 200 mV, 8 ohms, 0.015% THD . . . . . . . . .

0.47 V/470 ohms

Frequency Response

CD, etc.20 Hz to 20 kHz . . . . . . . . . . . . . . . . . . . . . .0 ±0.5 dB

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

RIAA Equalization Deviation

PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 ±0.5 dB

Total Harmonic Distortion (20 Hz to 20 kHz)

PHONO MM to REC OUT (3 V) . . . . . . . . . . . . . . . .

0.008 % or less

CD, etc.to PRE OUT (1V) . . . . . . . . . . . . . . . . 0.007 % or less

CD, etc.to SP OUT (50 W/8 ohms) . . . . . . . . . 0.012 % or less

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

Residual Noise (IHF-A Network)

CD DIRECT AMP ON . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 µV

PURE DIRECT ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 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

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

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 220/230-240 V, 50/60 Hz

Power Consumption

U, C models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 W, 360 VA

R, A, G, E, L models . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 W

Standby Power Consumption (reference) . . . . . . . . . . . . 0.1 W

Maximum Power Consumption (R model)

1 kHz, 6 ohms, 10%THD . . . . . . . . . . . . . . . . . . . . . . . 650 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.

VIDEO SECTION

Video SignalType

U, C, R models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NTSC

A, G, E, L models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAL

Video Signal Level . . . . . . . . . . . . . . . . . . . . . 1 Vp-p/75 ohms

Video Maximum Input Level . . . . . . . . . . . . . . 1.5 Vp-p or more

Video Signal to Noise Ratio . . . . . . . . . . . . . . . . 50 dB or more

Monitor Out Frequency Response . . . . 5 Hz to 10 MHz, -3 dB

RX-797

DPX-1200

RX-797

U ........ USA model

C ........ Canadian model

R ........ General model

A ........ Australian model

G ........ European model

E ........ South European model

L ........ Singapore model

Unit : mm (inch)

DIMENSIONS

435 (17-1/8")

151 (5-15/16")

130 (5-1/8") 349 (13-3/4")21

(13/16") 18.5

(3/4") 21.5

(7/8")

389 (15-1/16")

Dimensions (W x H x D) . . . . . . . . . . . . . . 435 x 151 x 389 mm

(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

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.

■INTERNAL VIEW

qMAIN (2) P.C.B.

wMAIN (3) P.C.B.

eMAIN (8) P.C.B.

rMAIN (4) P.C.B.

tMAIN (5) P.C.B. (R, L models)

yMAIN (1) P.C.B.

uXM P.C.B. (U, C models)

iFUNCTION (4) P.C.B.

oFUNCTION (5) P.C.B.

!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.

!7 OPERATION (3) P.C.B.

!8 MAIN (6) P.C.B.

!9 OPERATION (2) P.C.B.

@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.

@6 OPERATION (4) P.C.B.

qwert yu io !0 !1

!4 @0 @1 @2 @3

@4 @5 @6!5 !7

!5 !6 !7 !8 !9

trademarks are the property of their respective owners.

RX-797

■DISASSEMBLY PROCEDURES

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 6 knobs (INPUT, REC OUT, BASS, TREBLE,

BALANCE, LOUNESS).

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)

•Remove parts in disassembly order as numbered.

•Disconnect the power cable from the AC outlet.

Fig. 1

Knob

Top Cover

Sub Chassis Unit

Plate Side L

Plate Side R

CB404 CB401

CB407 CB283

CB606

CB503

Support Top

Front Panel Unit

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 CB283, CB401, CB404, CB407,

CB503 and CB606 and then remove the Sub Chassis

Unit. (Fig. 1)

RX-797

DPX-1200

RX-797

■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)

MICROPROCESSOR INFORMATION

1.VERSION

2. CHECK SUM

3. OPE / XM

4. PORT

5. EE SUM

RX-797

●Starting DIAG

Press the “MASTER” key of the main unit while simulta-

neously 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 “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.

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

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.

Turn off the power by pressing the “MASTER” 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

RX-797

DPX-1200

RX-797

The protection function worked due to a DC voltage ap-

pearing at the speaker terminal.

A cause could be a defect in the amplifier. If the power is

turned on with the abnormality unsolved, the protection func-

tion works in about 3 seconds to turn off the power.

DC PRT :000 Z

TMR 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

works in about 1 second to turn off the power.

For detection of each protection function (except I-PRO-

TECT) , refer to DIAG MENU No.3 AD DATA CHECK (p.13).

●History of protection function

When the protection function has worked, its history is stored

in memory with a backup.Even if no abnormality is noted while

servicing the unit, an abnormality which has occurred previ-

ously can be defined as long as the backup data has been

stored.

The history of the protection function is cleared when DIAG is

cancelled by selecting PRESET RESERVED (Memory initial-

ized) of DIAG menu No.2 or when the backup data is erased.

●Display during menu operation

During the DIAG operation, the function at work is indi-

cated on the FL indicator.The contents displayed dur-

ing the function operation are described later in the “De-

tails of DIAG menu” section.

●Operation procedure of DIAG MENU and

SUB-MENU

There are 8 MENU items, each of which has some SUB-

MENU items.

DIAG menu selection

Select the menu using PRESET NO keys.

●Functions in DIAG mode

In addition to the DIAG menu items, functions as listed

below are available.

• Input selection

• Muting

• Power on/off

• Master volume

* Functions related to the tuner is not available.

●Initial settings used to start DIAG

The following initial settings are used when starting

DIAG.When DIAG is canceled, these settings are re-

stored to those before starting DIAG.

• Input: DVD

• Audio mute: OFF

• DIAG menu: DISPLAY CHECK (1.VFD CHECK)

Reverse Forward

SUB-MENU selection

Select the sub-menu using w(Forward) and q(Reverse)

keys of TUNING.

TML PRT:000 Z

RX-797

Initial display

All segments OFF

All segments ON

(dimmer 100%)

All segments ON

(dimmer 50%)

Lighting of segments

in lattice

Lighting in lattice

NormalShort

1. DISPLAY CHECK

This program is used to check the FL display section.The

display condition varies as shown below according to the

sub-menu operation.

Segment conditions of the FL driver and the FL tube are

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.)

2. FACTORY PRESET

This menu is used to reserve/inhibit initialization of the back-

up RAM.

2.PRESET INHI

2.PRESET RSRV

PRESET INHIBIT (Initialization inhibited)

RAM initialization is not executed. Select this sub-

menu to protect the values set by the user.

Note:The protection history will not be erased using

PRESET INHIBIT.

PRESET RESERVED (Initialization reserved)

Initialization of the back-up RAM is reserved.(Actu-

ally, initialization is executed the next time that the

power is turned on.) Select this sub-menu to reset

to the original factory settings or to reset the RAM.

Use PRESET RESERVED to erase the protection

history.

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.)

Preset group

P1 P2 P3 P4

Preset group

P5 P6 P7 P8

RX-797

DPX-1200

RX-797

●PRESET STATIONS

STATION

FM FACTORY PRESET DATA (MHz)

PAGE NO. U, C R, A, G, E, L

1 87.5 87.50

2 90.1 90.10

3 95.1 95.10

A/C/E 4 98.1 98.10

5 107.9 108.00

6 88.1 88.10

7 106.1 106.10

8 107.9 108.00

STATION

AM FACTORY PRESET DATA (kHz)

PAGE NO. U, C, R A, G, E, L

1 630 630

2 1080 1080

3 1440 1440

B/D 4 530 531

5 1710 1611

6 900 900

7 1350 1350

8 1400 1404

REC-OUT:160

REC-OUT

255% display of the voltage based on the rec-out selector

detected value. Reference voltage: 5V

For the correct value, refer to the table below.

DC/PS (protection detection)

DC: DC detect protection value

Normal value: 19 to 51 (Reference:5V = 100%)

PS: Power supply voltageprotection value

Normal value: 54 to 84 (Reference:5V = 100%)

When the value is outside of the normal range, the pro-

tection function works to turn off the power.

3. AD DATA CHECK

With this sub-menu used, the key scanning, A/D value of

the voltage at the abnormality detect (protection) port, etc.

are displayed.The A/D conversion value is displayed in %.

The state before audio signal processing is kept.

When K0/K1 menu is selected, keys become nonoperable

due to detection of the values of all keys.

However, it is possible to advance to the next sub-menu by

turning the INPUT of the main unit. When using this func-

tion, note that turning the INPUT more than 2 clicks will

cause the volume value to change.

*The numeric value in the diagram is for reference.

DC:035 PS:067

THM:L096 R098

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-

tected value. Reference voltage: 5V

% U, C R, A, G, E, L

1 22 – 46 DVD DVD

2 47 – 75 DTC/CBL DTV/CBL

3 76 – 105 VCR VCR

4 106 – 135 MD/TAPE MD/TAPE

5 136 – 166 CD SOURCE

6 167 – 199 XM CD

7 200 – 236 TUNER TUNER

8 237 – 255 PHONO PHONO

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

is not within the standard value range, no correct operation

is provided.Referring to the table below, check the value of

each voltage dividing resistor of each key, solder condition,

etc.

K0:100 K1:099

% Key0 Key1

1 0 – 4 FM/AM P8

2 4 – 12 TUNING DOWN P7

3 12 – 21 TUNING UP P6

4 21 – 30 TUNING MODE P5

5 31 – 41 MEMORY P4

6 42 – 52 EDIT P3

7 52 – 61 ZONE CTRL P2

8 61 – 68 SPEAKER B P1

9 68 – 74 SPEAKER A A/B/C/D/E

10 75 – 81

11 81 – 89

4. XM STATUS

XM Radio data is displayed.

. XMS1xxxxxxx

. XMS2xxxxxxx

RX-797

5. PROTECTION SETTING

This menu is used to change the protection setting value.

The change is effective in this menu only. A set value can

be specified between 0 – 255 (0V – 5V).

Operation:

Change the digit with the “EDIT” key.

UP / DOWN with the TUNING MODE / MEMORY key.

PS_Lo: 0138

PS_Hi: 0215

DC_Lo: 00 9

DC_Hi: 0131

TEMP : 0089

The PS protection LO level threshold value can be set.