Yamaha Rx-v990 User manual

STEREO RECEIVER

RX-V990

SERVICE MANUAL

YAMAHA.

NoIIa'UIVII.......a ~ ~

I"D(~

~-,

"'-- ",.-

. F1

VCR I

-PRO LOGIC

I I

---

, ,

_~c.:J~

-a.-.-...cI~_-

~ t • • ~....". •

'7 •

_tti-_ ....

-ntA..

_C=:J

I , , , , , I

'I ,,,

'-'-I

... _....=___ ..

'=1'- __

+ ___ - + ~ ___ ~

....:rr

CJ CJ

CJ.9_ CJ

c::::::J

I,,,I

c::::::J

----

().

.0..

,C)

..:XTIE

6-6 i

i~-~

IIII

IMPORTANT NOTICE

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.

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:

Tum the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.

• CONTENTS

TO SERVICE PERSONNEL 1

INTERNAL ViEW 1

REAR PANELS 2

SPECIFICATIONS 2 3

DISASSEMBLY PROCEDURES 4

DIAGNOSTIC MODE

AMP ADJUSTMENTS 9

TUNER ADJUSTMENTS 10 13

IC DATA

1~18

BLOCK DIAGRAM 19 21

PRINTED CIRCUIT BOARD 22 32

PIN CONNECTION DIAGRAM 33

IC BLOCKS

3~35

SCHEMATIC DIAGRAM 36--39

PARTS LIST 40 53

REMOTE CONTROL TRANSMITTER 54

11005671

YAMAHA

CORPORATION

P.O,Box1

Hamamatsu,Japan

1.4K-357

fQ]

Printed in Japan '96.5

RX-V990

.~------------ -------

•TO SERVICE PERSONNEL

1, Critical Components Information.

Components having special characteristics are marked 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 ohm shunted

byO.15µF.

• Leakage current must not exceed 0.5mA.

AC LEAKAGE

WALL EQUIPMENT TESTER OR

OUTLET UNDER TEST EQUIVALENT

v---J

) ) =

INSULATING

TABLE

•Be sure to test for leakage with the AC plug in both

polarities.

"CAUTION"

"F601,602 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE T6.0A, 125V FUSE."

"Fa01 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 10A, 250V FUSE."

CAUTION

F601,602 : REPLACE WITH SAME TYPE T6.0A, 125V FUSE.

Fa01 : REPLACE WITH SAME TYPE 10A, 250V FUSE.

ATTENTION

F601,602 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE T6.0A, 125V.

Fa01 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 10A, 250V.

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 WHAT SO EVER!

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.

• INTERNAL VIEW

P. C. B. FUNCTION (6)

POWER TRANSFORMER

•P. C. B. MAIN (2)

P. C. B. FUNCTION (4)

P. C. B. FUNCTION (1)

P. C. B. TUNER

P. C. B. DSP (3)

P. C. B. MAIN (4)

P. C. B. MAIN (1)

CD>

P. C. B. MAIN (3)

P. C. B. DSP (1)

~P. C. B. DSP (2)

• REAR PANELS

... U model

@ @

RX-V990

AORIt:III ___

A+a:aa ....

..wotMIII

c:.a

1IP'I.IoKIft

C+O:4

1W'U1C1R

... C model

@ @

ACllla:III-'JIfIUICIII

A+ .. --. .........

.. aua:IICI

IMIIIIf .......

...+...

IHIIIIf...fOJUlUUl

• SPECIFICATIONS

• AUDIO SECTION

Minimum RMS Output Power per Channel

FRONT, 20Hz to 20kHz, 0.015% THD, 80 100W

FRONT, 20Hz to 20kHz, 0.04% THD, 60 (U only) 120W

CENTER, 1kHz, 0.015% THD, ao WOW

REAR, 1kHz, 0.08% THD, 80 25W

Dynamic Power per Channel (IHF)

a/6/4/20 130/160/215/31 OW

Dynamic Headroom (an) 1.14dB

Power Band Width

o.oa% THD, 50W, an 10Hz to 50kHz

Damping Factor

20Hz to 20kHz, an 200 or more

Input Sensitivityllmpedance

PHONO MM 2.5mV/47kn

CD etc : 150mV/47kn

MAIN IN 1.0V/47kO

Maximum Input Signal Level

PHONO MM, 1kHz, 0.02% THD 110mV

CD etc, 1kHz, 0.5% THD (EFFECT ON) 2.2V

Output Level/Impedance

REC OUT 150mV/1.0kO

PRE OUT 1.0V/1.5kO

LPF (EFFECT OFF) 3.5V/2.7kn

Headphone Jack Rated Output/Impedance

Input 1kHz, 150mV, an 0.55V/390n

RX-V990

Frequency Response (20Hz to 20kHz)

MAIN IN, FRONT 0±0.2dB

CD etc, FRONT 0±0.5dB

RIAA Equalization Deviation (20Hz to 20kHz)

PHONO MM 0±0.5dB

Total Harmonic Distortion (20Hz to 20kHz)

PHONO MM to REC OUT (1V) 0.01%

CD etc to FRONT SP OUT (50W/80), EFFECT OFF 0.015%

CD etc to REAR SP OUT, 1kHz (12.5W/8Q) 0.3%

Signal-to-Nolse Ratio (IHF-A-Network)

PHONO MM, Input Shorted (5mV) REC OUT 86dB

CD etc, Input Shorted (150mV)

OUT, EFFECT OFF 98dB

Residual Noise (IHF-A-Network)

FRONT, SP OUT 170µV

Channel Separation (Vol. -30dB, EFFECT OFF)

PHONO MM, Input Shorted, 1kHz/10kHz 60dB/55dB

CD etc, Input 5.1 kQ Shorted, 1kHz/10kHz 60dB/45dB

Tone Control Characteristics

BASS : Boost/cut ±10dB (50Hz)

Turnover Frequency 350Hz

TREBLE : Boost/cut ±10dB (20kHz)

Turnover Frequency 3.5kHz

Bass Extension 50Hz, +6dB

Filter Characteristics

LPF fc=200Hz, 6dB/oct

Gain Tracking Error (OdB to -70dB) 3dB

Tuner Output Level/Impedance

FM (100% mOd., 1kHz) 500mV/2.2kQ

AM (30% mod., 1kHz) 150mV/2.2kQ

Muting -

•FM SECTION

Tuning Range 87.5 to 107.9MHz

50dB Quieting Sensitivity (IHF, 75 Q)

Mono 1.55µV (15.1dBf)

Stereo 21 µV (37.7dBf)

Usable Sensitivity (75 Q)

30dB SIN Quieting, 1kHz, 100% mod 0.8µV (9.3dBf)

Image Response Ratio 45dB

IF Response Ratio 80dB

Spurious Response Ratio 70dB

AM Suppression Ratio 55dB

Capture Ratio 1.5dB

Alternate Channel Selectivity (± 400kHz) 85dB

Signal-to-Noise Ratio (IHF)

Mono/Stereo 80/75dB

Harmonic Distortion (1kHz)

Mono/Stereo 0.1/0.2%

Frequency Response

20Hz to 15kHz 0 ± 1.5dB

Stereo Separation (1kHz) 50dB

• AM SECTION

Tuning Range 530 to 1710kHz

Usable Sensitivity 100µV/m

Selectivity 32dB

Signal-to-Noise Ratio 50dB

Image Response Ratio 40dB

Spurious Response Ratio 50dB

Harmonic Distortion (1kHz) 0.3%

• VIDEO SECTION

Video Signal Type NTSC

Video Signal Level 1Vp-p/75Q

S-Vldeo Signal Level

Y 1Vp-p/75Q

C 0.286Vp-p/75Q

Maximum Input Level 1.5Vp-p

Signal-to-Noise Ratio 50dB

Monitor Output Frequency Response 5Hz-1 OMHz, -3dB

• GENERAL

Power Supply AC 120V, 60Hz

Power Consumption

C model 330W/440VA

U model 340W

AC Outlets

2 Switched Outlets 120W max (Total)

1 Unswitched

U model 200W max

C model 180W max

Dimensions (W x H x D) 435 x 171 x 470mm

(17-1/8" x 6-3/4" x 18-1/2")

Weight 15.0 kg (33 Ibs 1oz)

Accessories AM loop antenna x 1

Indoor FM antenna x 1, Remote Control Transmitter x 1

Battery (size "AA", "R06") x 2

• Specifications subject to change without notice.

U USA

model

Canadian model

Manufactured under license from Dolby Laboratories Licensing

Corporation. "Dolby", "Pro Logic", and the double-D symbol

DC]

are

trademarks of Dolby Laboratories Licensing Corporation .

• DIMENSIONS

Illl

~J..ILU.

U U

1-..-1

"''''

g3~

...rJn

__ CCCCc:::::::::I C~ DCt::::::::l

~t=:J

0-0

Cll>

'!!

435(17-1/8") -~

N£

Units: mm (InCh)

-...------ I

RX-V990

• DISASSEMBLY PROCEDURES

(Remove parts in disassembly order as numbered.)

1. Removal of Top Cover

a. Remove 4 screws (

CD )

and 3 screws (

CI! )

in Fig. 1.

2. Removal of Bottom Cover

a. Remove 11 screws ( ® ) in Fig. 1.

3. Removal of Front Panel

a. Remove 5 knobs.

b. Remove 6 screws ( ® ) in Fig. 1.

Front Panel

----.......J

• DIAGNOSTIC MODE

PURPOSE OF DIAGNOSTIC MODE

•If the protection circuit operates to turn OFF the

POWER when the POWER is turned ON, the cause can

be found out by starting the DIAGNOSTIC mode. (Pro-

tection message)

• Some items of the DIAGNOSTIC menu facilitate opera-

tion check, inspection and measurement.

HOW TO START DIAGNOSTIC (DIAG.)

Turn on the POWER key while pressing

ClO

PRO LOGIC

and 70mm MOVIE THEATER keys simultaneously, and

then the DIAG. mode is started.

HOW TO CANCEL DIAG.

Turning off the POWER key of the front panel or pressing

the CHURCH key of the remote control transmitter will

restore the normal operation and DIAG. will be canceled.

•To keep the setting stored in the memory, be sure to

check that DIAG. No. 7 is set to "KEEP DATA" before

canceling DIAG. DIAG. No.7 is set to "KEEP DATA"

when starting DIAG.

Top Cover

Bottom Cover

Fig. 1

Monitor Display

DIAG VER.·· ....

1. MAIN BYPASS

2. FRONT RAM THR

3. MAIN DSP THR

4. EFCT OFF/DISP

5. MANUAL TEST

6. PRO LOGIC

7. FACTORY PRESET

8. AD CHECK MODE

The menu of the DIAGNOSTIC mode is displayed on

the monitor display and kept as it is untill canceled.

RX-V990

CONTENTS OF DIAG. OPERATIONS

• DIAG. MENU can be selected by pressing the PRESET

STATIONS key of the front panel or PROGRAM key of

the remote control transmitter.

• Each DIAG. MENU has a SUB-MENU. Every time the

same key, PRESET STATIONS key of the front panel or

PROGRAM key of the remote control transmitter is

pressed, another SUB-MENU is selected.

• While the diagnostic mode is set, function of power on/

off, selecting an input source, adjusting master volume

and effect level are available.

• The contents of each DIAG. MENU are as follows.

No. DIAG. Menu Sub Menu

MAIN BYPASS EFFECT LEVEL 60 (-10dS)/80 (OdS)

FRONT RAM THR EFFECT LEVEL 60 (-10dS)/80 (OdS)

MAIN DSP THR EFFECT LEVEL

100 (+10dS)/60 (-10dS)/80 (OdS)

EFFECT OFF/DISP EFFECT OFF/DISPLAY CHECK

MANUAL TEST TEST: LEFT/CENTER/RIGHT/SUR

PRO LOGIC CENTERNORMAUCENTERWIDE/CENTER

PHANTOM/BYPASS/CINEEO.ON (Note1)

FACTORY PRESET KEEP DATNFACTORY PRESET

AD CHECK MODE KEY AD

OTHER AD CHECK

EXIT (Note 2)

Note

CI N E EO ON appears but such function is not

provided.

Note 2: No.9 menu item is available only through the

remote control.

FL DISPLAY

When the DIAGNOSTIC mode is set, the initial display

appears on the FL display followed by the DIAGNOSTIC

display (No.1).

The initial display can be redisplayed by pressing the AlB/

C/D/E key (but not when performing AD check by using

DIAG. No.8).

• Components of initial display (Example)

[3= ~CJ 40

t t

RXV990U

t t

Protection AD

Message value

Model &ROM

Market version

[Protection message]

When the protection function activated, the protection mes-

sage is displayed and the power is turned off.

Instantly ~ "1 I"

After about 0.5 seconds ~ "2 PS"

After about 2 seconds - "3 DC"

Correct the faulty part according to the protection message.

Protectionmessage Cause

1 I Anabnormalcurrentflowedto the poweramplifier.

2PS Abnormalconditionoccurredin the powersection.

3 DC DCis detectedinthe outputof the poweramplifier.

[AD value to Model

Market relation]

AD value (+3) Model

Market Remarks

10 RXV990 R

R : General model

40 RXV990 U" UC : USA

Canadian models

40 RXV990 A

A : Australian model

70 RXV990 L" G : European model

• Components of DIAGNOSTIC display

DIAG.tmenu

MAIN BYP 60

operat{on display

Input source

No.

*Supplement

When in the DIAG. mode, lighting of all segments of

the tuning meter for catalogue photographing can be

reserved by using the EFFECT key. (Do not use this

function as it is not intended for servicing.)

With such reservation made, all segments of the tun-

ing meter light when the tuner function is selected in

the normal mode. (This reservation is effective once

only at the next POWER ON. After that, normal meter

operation is provided.)

Content FL display

Reservation of full scale T-METER ON

Reservation of normal T-METER OFF

------------------------------

HOW TO USE DIAG. MODE

In order to confirm characteristics (specifications)

listed in the table below, use DIAG. No.1, 3 and 4.

(For specifications, refer to page 3.)

No. Items

• Output Level/Impedance

• Frequency Response

•SIN

• Minimum RMS Output Power Per Channel (Center &

Rear)

• Total Harmonic Distortion (Center &Rear)

• Minimum RMS Output Power Per Channel (Front)

4• Dynamic Power

• Power Bandwidth

• Damping Factor

• Input Sensitivity/lmpedance

• Headphone Jack Rated Output/Impedance

• Channel Separation

• Total Harmonic Distortion (Rec Out &Front)

• Tone Control Characteristics

CONTENTS OF DIAGNOSIS

MAIN BYPASS

• MAIN UR is output through the bypass.

• CENTER is output with the steering off and at (L + R)/2.

• RURR is output by way of PS-RAM at DSP through.

• Electric volume for both the CENTER & REAR is

changeable by changing the SUB-MENU.

Sub-menu FL display

Center &Rear

E. Volume -10dB 1 (Input source) MAIN BYP 60

Center &Rear

E. Volume OdB 1 (Input source) MAIN BYP 80

YSS223

DOLBY PRO LOGIC section

+~lzr~~----

DSPsection

c.t&-

.- RR

PS-RAM •

----- ______ 1

RX-V990

FRONT RAM THR

C(L+R)12 L

• CENTER is output with the steering off and at (L + R)/2.

• RURR is output by way of PS-RAM at DSP through.

• FUFR is output by way of PS-RAM to MAIN UR at

DSP through.

• Electric volume for both the CENTER & REAR is

changeable by changing the SUB-MENU.

Sub-menu FL display

Center

Rear

E. Volume -1 OdB 2(Input source) FRNT THR 60

Center

Rear

E. Volume OdB 2(Input source) FRNT THR 80

YSS223

DOLBY PRO LOGIC section

+~tzr~~----

,.-

,.....

DSP section

t...,1+-

•

PS-RAM •

-----------"

C (L+R)/2

MAIN DSP THROUGH

• MAIN UR is output through the PRO LOGIC.

• CENTER is output with the steering off and at (L + R)/2.

• RURR is output by way of PS-RAM at DSP through.

• Electric volume for both the CENTER & REAR is

changeable by changing the SUB-MENU.

Sub-menu FL display

Center &Rear

E. Volume +10dB 3 (Input source) MAIN DSP100

Center &Rear

E. Volume -10dB 3 (Input source) MAIN DSP60

Center &Rear

E. Volume OdB 3 (Input source) MAIN DSP80

YSS223

DOLBY PRO LOGIC section

__.-_nn ____

;~~Z~~~----

--.-----------

DSP section

'+EI7-

PS-RAM •

----- ______ 1

C(L+R)12

RX-V990

EFFECT OFF & DISPLAY CHECK

Effects always off in this menu.

All segments of the FL are displayed.

Sub-menu FL display

EFFECT OFF 4 (Input source) EFFECT OFF

FULL SEGMENT DISPLAY -FULL SEGMENTDISPLAY-

MANUAL TEST TONE

Every time PRESET key NO.5 is pressed, the TEST

TONE shifts and is output.

CENTER MODE is WIDE.

Electric volume for both the CENTER &REAR is 60

HOdB).

Sub-menu FL display

LEFT 5 (Input source) TEST LEFT

CENTER 5 (Input source) TEST CENTER

RIGHT 5 (Input source) TEST RIGHT

SURROUND 5 (Input source) TEST SUR

The auto input balance which is on in the normal mode

is turned off (PRO LOGIC).

Electric volume for both the CENTER and REAR is 60

(-10dB).

oIn the SUB-MENU of CINEMA EQ ON, CENTER

MODE is WIDE.

Center Mode NORMAL 6 (Input source) PRO LOGIC

Center mode WIDE 6 (Input source) PRO LOGIC

Center mode PHANTOM 6 (Input source) PRO LOGIC

EFFECT OFF 6 (Input source) BYPASS

Sub-menu I FL display

CINEMA EQ ON

6 (Input source) CINE EQ ON

Note) CINE EQ ON appears but such function is not pro-

vided.

11~llil

FACTORY PRESET

Reservation of the initializing DATA of the BACK-UP

RAM.

Then with the POWER key turned off after selecting

the SUB-MENU, FACTORY PST, all RAM DATA is

initialized.

Sub-menu

Keeping on RAM DATA

Initializing RAM DATA

CAUTION: Before setting to the FACTORY PRESET,

write down the existing preset memory con-

tent of the Tuner in a table as shown below.

(This is because setting to the FACTORY

PRESET will cause the user memory con-

tent to be erased.)

Preset group

P1 P2 P3 P4

Preset group

P5 P6 P7 P8

• Factory Preset

1) SURROUND section

DELAY TIME : [][] PRO LOGIC

: ENHANCED

: MOVIE THEATER

:TV THEATER

: SPORTS

: STADIUM

: ROCK CONCERT

: JAZZ CLUB

: CHURCH

: CONCERT HALL

CENTER MODE : NORMAL

EFFECT LEVEL : CENTER

: REAR

20ms

17ms

28ms

20ms

45ms

22ms

26ms

40ms

30ms

2) SELECTOR section

INPUT

VIDEO (BGV)

SURROUND PROGRAM

3) TUNER section

: CD

: LD/TV

:[][] PRO LOGIC

Preset group

P1 P2 P3 P4

A/C/E

87.5MHz 90.1MHz 95.1MHz 98.1MHz

530kHz

BID 1080kHz 1440kHz (U, C, R)

630kHz 531kHz

(R,A, G)

Preset group

P5 P6 P7 P8

107.9MHz 107.9MHz

A/C/E

(U, C, R) 88.1MHz 106.1MHz (U, C, R)

108.0MHz 108.0MHz

(R,A,G) (R, A, G)

1710kHz 1400kHz

BID (U, C, R) 900kHz 1350kHz (U, C, R)

1611kHz 1404kHz

(R,A, G) (R,A, G)

For all the above, AUTO TUNING and AUTO STEREO are

selected as the TUNING mode.

RX-V990

I<DIAG8

AD DATA CHECK

•In this MENU, it is possible to check the several AD data .

• The AD data is a percent unit, about 2.8V is equal to 100% only for tuning meter, about 5V is equal to 100% for the others.

Sub-menu FL display

Normal DIAG. mode

(Input source) AD CHK MODE

PAGE 1 :

P 1 99

99 99 99 99

KEY AD DATA

AD check

CH 2

page No.

PAGE 2 :

2 1

OTHER AD DATA

AO check

REC OUT TUNING PROTECTION PROTECTION OTHER SWITCH

page No.

METER I

•In PAGE1, it displays the AD data of the keys, in PAGE2, the others .

• When in the PAGE1 or PAGE2 sub-menu, it is not possible to operate the menu of DIAG. No. 1-7.

Table

for checking

AD DATA.

AD Data Key AD Data (Page1) Other AD Data (Page2)

(±3) REC OUT Other switch

CHO CH1 CH2 CH3 CH4 VIDEO TYPE FREQUENCYSTEP

00 CENTERMODE PRO LOGIC 70mm MOVIE: AUX AUX 100/10kHz

10 PRESET ST. 7TUNING UP ENHANCED TV THEATER VCR2 VCR2 S1 5019kHz

20 PRESET ST.

TUNINGDOWN LEVEL UP SPORTS VCR1 VCR1 100/10kHz

30 PRESET ST. 5FM/AM LEVEL DOWN STADIUM LDITV LDITV S2 5019kHz

40 PRESET ST.

AUTO/MAN'L LEVEL REAR EFFECT PHONO SOURCE 100/10kHz

50 PRESET ST.

EDIT LEVELCENTER CONCERTHALL CD TAPE 1S1 5019kHz

60 PRESET ST. 2MEMORY

CHURCH TUNER TUNER 100/10kHz

70 PRESET ST. 1SPEAKER BDELAY UP JAZZ CLUB TAPE 1 CD S2 5019kHz

80 PRESETPAGE SPEAKER A DELAY DOWN ROCKCONCERTTAPE

MONITOR PHONO

90 KEY OFF STATE

99 KEY OFF STATE

---

Kind of the. protection (Page2) AD OAT A of normal

Protection 1 1-13

(DC is detected in power amp)

Protection 2 15-29

(Abnormal condition in power section)

Note)

• There is no U, C or A model for

S1/S2.

•S1 : R model (internal synchronization is NTSC type.)

G model (internal synchronization is PAL type.)

•S2 : R model (internal synchronization is prohibited.)

G model (internal synChronization is PAL type.)

IRX-V990

MP ADJUSTMENTS

• Idling Current Adjustment (FRONT)

1) No signal applied.

2) Non-loaded condition.

3) Aging is not neccessary.

Item Test Point Adjusted points Rating (~C)

FRONT LR694 or R695 VR601 3.0mV-3.5mV

FRONT R R707 or R708 VR602

'Confirm that the idling current (FRONT) is 6mV-12mV

after 60 minutes.

8 Confirmation of Idling Current (CENTER)

1) No signal applied.

2) Non-loaded condition.

3) Aging is not neccessary.

Note)

• Q617 and Q626 are transistors(2SC1846S) for tem-

perature correction. Apply silicone grease to contact

surface with the heat sink.

Item Test Point Rating

(~C)

Note

If the measured vOltage exceeds 6.1mV, cut the

CENTER R720 0.1mV-6mV lead wires of R682 and then check again if each

measured value satisfies the rating.

Note)

•If R682 has already been cut off and idling current does not flow, reconnect R682.

• Q633 is the transistor(2SC1846S) for temperature correction. Apply silicone grease to

contact surface with the heat sink.

R708

VR602

rl-

R720

br ~

t- -•

VR601 R707

R682

R694 or R695

R707 or R708

R720

FCUIOFF

'M'u

• TUNER ADJUSTMENTS

• Measuring Instruments

FM signal generator (FM SG)

Stereo signal generator (SSG)

AM signal generator (AM SG)

Distortion meter (DIST. M)

AC voltmeter (ACVM)

DC voltmeter (DCVM)

Oscilloscope

Low pass filter (YLF-15, fc=15kHz)

Oscillator

• Test point

• Dummy antenna

FM dummy antenna

FMSG

(500)

r------------------~

E1!

W~ ~~~:

1_- .:

E2 (dB)

E1 (dB) -6 (dB)

FM dummy antenna

r------------------~

RX-V990

RECEIVER

(750)

AMSG

(500)

E1 ''E2

'MOO

RECEIVER

(750) ~ (750)

, ,

I. .'

E2 (dB)

E1 (dB)

AM dummy antenna

r------------------·

: 10KO:

It)

~ ~

II ~ GND

MONAURAL DISTORTION ADJ. (ANTENNA)

DISCRIMINATOR BALANCE ADJ. (FRONT)

AM SENSITIVITY ADJ.

SIGNAL METER ADJ.

rr=tu····---o·~

~-- .

PK1

oFRONT END

SEPARATION ADJ.

1 ------------_:

(Viewed from the Bottom)

1FT

'----"0

it-:

PK1

FRONT END

RX-V990

FM Adjustment

• Before Adjustment

1) For dB, 1µV=OdBµ applies.

Example: 60dBµ=1mV

2) 100% modulation means that the frequency deviation is

75kHz.

3) Install the Matching Transformer and connect FM SG.

• Connection diagram (Measuring instruments)

1) Discriminator balance adjustment

ANT

TUNER

GND

C. B. DCVM

dummy

antenna

TP2

2) Monaural distortion adjustment

ANT

TUNER

C. B.

dummy

antenna

R :

...0.-

REC

I lOUT

SG GND

See page 10 for TP locations

adjustment points.

4) Set each switch to the following position unless other-

wise specified.

INPUT SELECTOR TUNER

TUNING MODE AUTO

3) Stereo distortion adjustment/separation adjustment

dummy

SG antenna

4) Sensitivity Verification

ANT

GND

TUNER

C. B.

R :

dummy

antenna

REC

lOUT

Step Adjustment item Reception Adjustment Test point RatingSignal (ANT IN) frequency point

Rough adjustment of FM ANT (750) 98.1MHz T1 Both ends of R25 DC OV±100mV

discriminator balance 98.1MHz • (A-4) (Front side core) (Between TP1 and TP2)

70dBµ

MONO 1kHz

100% modulation

2Rough adjustment of Same as Step 1. 98.1MHz T1 REC OUT L, R Minimize the dis-

monaural distortion • (A-4) (Antenna side core) tortion.

Fine adjustment of Same as Step 1. 98.1MHz T1 Both ends of R25 DC OV±50mV

discriminator balance • (A-4) (Front side core) (Between TP1 and TP2)

4Fine adjustment of Same as Step 1. 98.1MHz T1 REC OUT L, R Minimize the dis-

monaural distortion • (A-4) (Antenna side core) tortion (to 0.25%

or less).

Verification of dis- Same as Step 1. 98.1MHz T1 Both ends of R25 DC OV±50mV

criminator balance • (A-4) (Front side core) (Between TP1 and TP2)

• : Execution of FACTORY PRESET (Refer to page 7.) will facilitate setting reception frequency for adjustment.

RX-V990

Step Adjustment item Signal (ANT IN)

Reception Adjusted Test point Rating

frequency point

6Adjustment of FM ANT (750) 98.1MHz Front end 1FT Pin 16 of IC1 Adjust so that the DC voltage

front end 1FT 98.1MHz ' (A-4) is maximum.

3OdBµ CAUTION: Over-adjustment

MONO of the 1FTcore will reduce the

1kHz, sensitivity.

100% modulation Maximum ±90°

Verification of monau- FM ANT (750) 98.1MHz RECOUT L, R 0.4% or less

ral distortion 98.1MHz ' (A-4)

70dBµ

MONO 1kHz,

100% modulation

Verification of stereo FM ANT (750) 98.1MHz RECOUT L, R 1% or less

distortion 98.1MHz ' (A-4) • STEREO indicator should

70dBµ 'Tuning light.

Stereo L or R mode

1kHz, should be

100% modulation AUTO.

Verification of sensi- FM ANT (750) 88.1MHz ANT (750) 1) Set the tuning mode to MAN'L

tivity 88.1MHz • (A-6) MONO (Muting OFF).

98.1MHz 98.1MHz

2) SIN

should be 30dB at each

106.1MHz • (A-4) frequency of 88.1MHz,

106.1MHz 98.1 MHz, and 106.1 MHz.

• (A-7) 3) Check to ensure that the

voltage at the ANT terminal

is 3dBµ (14.25dBf) or less.

Adjustment of FM ANT (750) 98.1MHz VR2 RECOUT L, R With SSG output at L or R, the

Separation 98.1MHz • (A-4) signal leakage level at the

70dBµ other channel should be mini-

Stereo Lor R mized.

1kHz, 36dB or more

100% modulation

Adjustment of Signal FM ANT (750) 98.1MHz VR1 Adjust so that all signal

meter 98.1MHz • (A-4) meters light.

45dBµ

MONO 1kHz

30% modulation

-1 OdBµ or less Check to ensure that signal

meters turn OFF.

Verification of auto FM ANT (750) 98.1MHz • Automatic reception

tuning 98.1MHz should be available when

23dBµ the tuning key is moved UP

Stereo L or R and DOWN.

1kHz, • The stereo indicator should

30% modulation light.

• Audio muting should be ap-

plied during tuning.

• : Execution of FACTORY PRESET (Refer to page 7.) will facilitate setting reception frequency for adjustment.

AMANT L

AMSG AMSG TUNER R

ACVM

C. B.

REC

GND OUT DlST.M

Oscilloscope

AM loop antenna

RX-V990

AM Adjustment (This should be done after FM adjustment.)

• Connection Diagram (Measuring instruments)

1) Adjustment of sensitivity

See page 10 for TP locations & adjustment points.

Step Adjustment item Signal (ANT IN)

Reception Adjustment Test point Rating

frequency point

Adjustment of AMANT 1440kHz T2 RECOUT Audio output should be

sensitivity 1440kHz • (B-3) maximized.

(1440Hz) 50dBµ

1kHz

30% modulation

Verification of AMANT 630kHz T2 RECOUT Audio output should be

sensitivity 630kHz • (B-1) maximized.

(630kHz) 50dBµ Repeat steps 1 and 2.

1kHz

30% modulation

Verification of AMANT 630kHz AMANT Distortion should be 10% or less at

sensitivity 630kHz • (B-1) each frequency.

1080kHz 1080kHz Check to ensure that the voltage at

1440kHz • (B-2) the ANT terminal is 54dBµ or less.

30% modulation 1440kHz

• (B-3)

Verification of auto AMANT Auto reception should be avail-

tuning 60dBµ able when the tuning key is moved

UP and DOWN .

• : Execution of FACTORY PRESET (Refer to page 7.) will facilitate setting reception frequency for adjustment.

•IC DATA

IC7: YSS223

Digital Dolby Pro Logic De<:oder with Auto Input Balance

RX-V990

No. Name

I/O

Function

AGND A- Ground (Analog section)

VREF AI Multiplying DAC reference voltage input

LlNM AI L channel Multiplying DAC input

4RINM AI R channel Multiplying DAC input

VOLM AO L channel operation amplifier, connected to

terminal

VOLP AO L channel operation amplifier, connected to (+) terminal

VOCM AO C channel operation amplifier, connected to (-) terminal

VOCP AO C channel operation amplifier, connected to i+) terminal

VORM AO R channel operation amplifier, connected to (-) terminal

VORP AO R channel operation amplifier, connected to (+) terminal

AVDD A- +5V power supply (Analog section)

DGND

Ground (digital section)

TESTI Ic LSI test terminal Normally connected to DGND

/IC Ics Initial clear terminal (Power ON resetting is necessary)

OVF

ND Converter, Overflow detect terminal

CRS Its Microprocessor interface reset terminal

CDI Its Microprocessor interface data input terminal

XCLK Its Microprocessor interface clock input terminal

I/Ot

] External delay RAM data terminal

I/Ot

AGND

CHR

RINS

L1NS

CHL

AVDD

DGND

64FS

ADD

256FS

SYNCO

TIjICE

~ Al0

~IOE

~All

~A8

~ A13

~/WE

~ ~ DVDD

RX-V990

IC7: YSS223

Digital Dolby Pro Logic Decoder with Auto Input Balance

No. Name

110

Function

AO 0

A1 0

A2 0

External data RAM address terminal

A6 0

A7 0

A12 0

A14 0

DVDD

] +5V power supply (digital section)

DVDD

/WE 0 External delay RAM write enable terminal

A13 0

] E~'mal d,'ay RAMadd"" ",mioal

A8 0

A9 0

A11 0

fOE

External delay RAM output enable terminal

A10

External delay RAM address terminal

ICE

External delay RAM chip enable terminal

D7 1/0t

E>rt,mald'~y RAMdata"'mioal

D6 I/Ot

D5 1/0t

D4 I/Ot

D3 1/0t

SYNCO 0 External

converter word clock terminal

256FS 0External

converter 256fs clock terminal

ADD It External

converter data input terminal

64FS 0External

converter 64fs clock terminal

] Crystal oscillator connecting terminal

XI I

DGND

Ground (digital section)

AVDD A- +5V power supply (Analog section)

FR AO FR channel D/A input

FL AO FL channel D/A output

CHL A- L1NS input Sample/hold Capacitor external terminal

L1NS AI L channel

input

RINS AI R channel

input

CHR A- RINS input Sample/hold Capacitor external terminal

RL AO RL channel D/A output

RR AO RR channel D/A input

CV AO

ND,

multiplying DAC center voltage

AGND A- Ground (Analog section)

Note:

Letters used in the above I/O column represent as follows.

I : Input terminal 0 : Output terminal

t :

TTL level C : CMOS level S : Schmidt input A: Analog

IC508 : M35010-062SP

Superimpose

RX-V990

Pin No. Symbol Terminal name Function

OSC1 External terminal for External terminal of oscillation circuit for display.

OSC2 oscillation circuit The standard oscillation frequency is about 7MHz.

The display position in the horizontal direction and width of characters on the TV screen

are determined according to this oscillation frequency.

CS Chip select input Chip select terminal

"L" is set when the serial data is transferred.

Hysteresis input. A pull-up resistor is built in.

SCK Serial clock input When CS terminal is "L", the SIN serial data is taken in at the SCK rise.

Hysteresis input. A pull-up resistor is built in.

SIN Serial data input The data and addresses for the display control register and display data memory are input

in serial form.

Hysteresis input. A pull-up resistor is built in.

AC Auto clear input The IC internal circuit is reset when in "L" state.

Hysteresis input. A pull-up resistor is built in.

7VDD2 Power supply terminal Analog type power supply terminal that should be connected to +5V.

CVIDEO Composite video signal Output terminal for composite video signal

output 2Vp-p composite video signal is output.

When making a superimposition, the character output and other features are superim-

posed on the composite video signals inputted through the CVIN terminal.

LECHA Character level input Input terminal to determine the output level for the characters in the composite video

signals. The color of characters is white.

CVIN Video input Input terminal for external composite video signals.

When making a superimposition, the character output and other features are superim-

posed on these composite video signals.

Vss Ground terminal Connection to GND.

PO Port

output Port terminal output or character baCkground signals (BLNK1) are output.