STR-K740P/K840P

SERVICE MANUAL

Ver 1.0 2002. 02
US Model Canadian Model AEP Model UK Model E Model
STR-K740P/K840P are the tuner and the amplifier section in HT-DDW740/DDW840.
Photo : STR-K840P (SILVER model)
Dolby Laboratories Licensing Corporation. DOLBY the double-D symbol ; AC-3 and PRO LOGIC are trademarks of Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
Models of area code AR, SP Rated Power Output at Stereo Mode (8 ohms 1 kHz, THD 0.7 %) STR-K840P: 90 W + 90 W Reference Power Output2) (8 ohms 1 kHz, THD 10 %) STR-K840P: FRONT1): 120 W/ch CENTER1): 120 W SURR1): 120 W/ch Models of other area code Rated Power Output at Stereo Mode (8 ohms 1 kHz, THD 0.7 %) STR-K840P: 100 W + 100 W2) STR-K740P: 80 W + 80 W2) Reference Power Output2) (8 ohms 1 kHz, THD 10 %) STR-K840P: FRONT1): 120 W/ch CENTER1): 120 W SURR1): 120 W/ch STR-K740P: FRONT1): 100 W/ch CENTER1): 100 W SURR1): 100 W/ch 1) Depending on the sound field settings and the source, there may be no sound output. 2) Measured under the following conditions:
Area code Power requirements
With 8 ohm loads, both channels driven, from 40 20,000 Hz; rated 100 watts (STR-K840P only)/80 watts (STR-K740P only) per channel minimum RMS power, with no more than 0.09 % total harmonic distortion from 250 milliwatts to rated output (Models of area code U only).

Amplifier section

POWER OUTPUT Models of area code U, CA Rated Power Output at Stereo Mode (8 ohms 40 Hz 20 kHz, THD 0.09 %) STR-K840P: 100 W + 100 W STR-K740P: 80 W + 80 W Reference Power Output (8 ohms 1 kHz, THD 0.7 %) STR-K840P: FRONT1):100 W/ch CENTER1): 100 W SURR1): 100 W/ch STR-K740P: FRONT1): 80 W/ch CENTER1): 80 W SURR1): 80 W/ch Models of area code CEL,CEK Rated Power Output at Stereo Mode (8 ohms 1 kHz, THD 0.7 %) STR-K840P: 100 W + 100 W2) STR-K740P: 80 W + 80 W2) Reference Power Output2) (8 ohms 1 kHz, THD 0.7 %) STR-K840P: FRONT1): 100 W/ch CENTER1): 100 W SURR1): 100 W/ch STR-K740P: FRONT1): 80 W/ch CENTER1): 80 W SURR1): 80 W/ch

E SP, CEL, CEK, AR MX

240 V AC, 50 Hz 230 V AC, 50 Hz 120 VAC, 60 Hz

Continued on next page

FM STEREO FM-AM RECEIVER

9-873-544-01

2002B1600-1 2002.02

Sony Corporation

Home Audio Company Published by Sony Engineering Corporation
Frequency response MULTI CH IN3), CD, MD/TAPE, DVD/LD, VIDEO 1, 2 Inputs (Analog) MULTI CH IN3), CD, MD/TAPE, DVD/LD, VIDEO 1, 2

AM tuner section

10 Hz 50 kHz +0.5/2 dB (with sound field, and tone bypassed) Tuning range Models of area code U, CA With 10-kHz tuning scale: kHz6) With 9-kHz tuning scale: kHz6) Models of area code E, AR, MX With 10-kHz tuning scale: kHz6) With 9-kHz tuning scale: kHz6) Models of area code MY, SP, CEL, CEK With 9-kHz tuning scale: kHz Antenna Loop antenna
Sensitivity: 250 mV Impedance: 50 kilohms S/N4): 96 dB (A, 250 mV5))
3) HT-DDW840 only 4) INPUT SHORT (with sound field and tone bypassed). 5) Weighted network, input level. Inputs (Digital) DVD/LD (Coaxial)
Intermediate Frequency 450 kHz Usable sensitivity S/N 50 dB/m (at 1,000 kHz or 999 kHz) 54 dB (at 50 mV/m) 0.5 % (50 mV/m, 400 Hz) 35 dB 40 dB
Sensitivity: Impedance: 75 ohms S/N: 100 dB (A, 20 kHz LPF) Sensitivity: Impedance: S/N: 100 dB (A, 20 kHz LPF)
Harmonic distortion Selectivity At 9 kHz: At 10 kHz:

VIDEO 2 (Optical)

Outputs MD/TAPE (OUT), VIDEO 1 (AUDIO OUT) SUB WOOFER
Voltage: 250 mV Impedance: 10 kilohms Voltage: 2 V Impedance: 1 kilohms
6) You can change the AM tuning scale to 9 kHz or 10 kHz. After tuning in any AM station, turn off the receiver. Hold down PRESET TUNING + and press. All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the procedure.

Video section

Inputs Video: Outputs Video: 1 Vp-p, 75 ohms 1 Vp-p, 75 ohms

Tone Gain levels:

6 dB, 1 dB step

General

Power requirements

FM tuner section

Tuning range Antenna terminals 87.5 - 108.0 MHz 75 ohms, unbalanced
U, CA, MX CEL, CEK MY, SP, AR E
120 V AC, 60 Hz 230 V AC, 50/60 Hz V AC, 50/60 Hz 120/220/240 V AC, 50/60 Hz
Intermediate Frequency 10.7 MHz Sensitivity Mono: Stereo: Usable sensitivity S/N Mono: Stereo: 18.3 dBf, 2.2 V/75 ohms 38.3 dBf, 22.5 V/75 ohms 11.2 dBf, 1 V/75 ohms 76 dB 70 dB

Power consumption

Area code Power consumption
U, MX CA CEL, CEK, MY, SP, E, AR
STR-K840P: 210 W STR-K740P: 180 W STR-K840P: 300 VA STR-K740P: 260 VA STR-K840P: 180 W STR-K740P: 155 W
Harmonic distortion at 1 kHz Mono: 0.3% Stereo: 0.5% Separation Frequency response Selectivity 45 dB at 1 kHz 30 Hz 15 kHz, +0.5/2 dB 60 dB at 400 kHz
Power consumption (during standby mode) 0.5 W Dimensions 298 mm (16 7/6/6/8 inches) including projecting parts and controls 7.0 kg (15 lb 7 oz)

Mass (Approx.)

Design and specifications are subject to change without notice.
Abbreviation U : US model. CA : Canadian model. CEL : AEP model. CEK : UK model. SP : Singapore model. (Malaysia model included.) MX : Mexican model. MY : Malaysia model. AR : Argentine model.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, metallized knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.
Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. Unleaded solder Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size.)

LEAKAGE

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The limit indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set
: LEAD FREE MARK Unleaded solder has the following characteristics. Unleaded solder melts at a temperature about 40C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! Strong viscosity Unleaded solder is more viscous (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.

0.15 F

AC Voltmeter (0.75 V)
Earth Ground Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PISES SONY DONT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPMENTS PUBLIS PAR SONY.

MODEL IDENTIFICATION

BACK PANEL
TABLE OF CONTENTS 1. GENERAL 5 2. TEST MODE 6 3. DIAGRAMS 8

Parts No.

MODEL K740P : US K740P : Canadian K740P : Malaysia,Singapore K740P : E K740P : AEP K740P : UK K840P : US K840P : Canadian K840P : Malaysia, Singapore K840P : E K840P : AEP K840P : UK K840P : Argentine K840P : Mexican
PARTS No. 4-238-189-2s 4-238-189-3s 4-238-189-4s 4-238-189-5s 4-238-189-6s 4-238-189-7s 4-238-193-0s 4-238-193-1s 4-238-193-2s 4-238-193-3s 4-238-193-4s 4-238-193-5s 4-238-193-8s 4-238-193-9s
3-1. Circuit Board Location 8 3-2. Block Diagrams MAIN Section 10 DISPLAY/POWER Section 11 3-3. Printed Wiring Board DIGITAL Section 12 3-4. Schematic Diagram DIGITAL Section (1/2) 13 3-5. Schematic Diagram DIGITAL Section (2/2) 14 3-6. Printed Wiring Board MAIN Section 15 3-7. Schematic Diagram MAIN Section (1/2) 16 3-8. Schematic Diagram MAIN Section (2/2) 17 3-9. Printed Wiring Board DISPLAY Section 18 3-10. Schematic Diagram DISPLAY Section 19 3-11. Printed Wiring Board VIDEO Section 20 3-12. Schematic Diagram VIDEO Section 20 3-13. Printed Wiring Board POWER Section 21 3-14. Schematic Diagram POWER Section 22 3-15. IC Block Diagrams 23 3-16. IC PIN FUNCTION DESCRIPTIONS 25

4. EXPLODED VIEWS 27

4-1. Front Panel Section 27 4-2. Chassis Section-4-3. Chassis Section-2 29
5. ELECTRICAL PARTS LIST 30
STR-K740P/K840P SECTION 1 GENERAL
FM MODE (Models of area code CEL, CEK only) ed, (Except for models of area code CEL, CEK) ef (32) INPUT MODE qg (22) IR (receptor) 4 (39, 46, 52) LEVEL 0 (16, 20, 28, 57)
This section is extracted from instruction manual.
PRESET TUNING +/ (Except for models of area code CEL, CEK) 3 (33, 54) PTY (models of area code CEL, CEK only) ef (34) SET UP 6 (4, 16, 37, 57) SHIFT eg (33) SLEEP (HT-DDW740 only) qf (37) SURR qd (28, 57)

ALPHABETICAL ORDER

2 CH wh (26)
A.DEC wk (24, 26) AM (Except for models of area code CEL, CEK) es (31, 32) BASS +/ wg (19, 30, 57) CD ql (22) CINEMA STUDIO EX A, B, C 9 (25) Digital Cinema Sound (indicator) qs (24) DIMMER ej (23) DISPLAY 2 (23, 34, 52) Display qa (23) DVD/LD wa (22)
MASTER VOLUME wd (20, 50) MD/TAPE qj (22) MEMORY eh (31, 33) MENU +/ e; (16, 28, 36, 37, 57) MENU </> ea (16, 28, 36, 37, 57) MODE wj (25, 30, 51) MULTI CHANNEL DECODING (indicator) (HT-DDW840 only) 7 (22) MULTI CH IN (HT-DDW840 only) qf (22) MUTING wf (22, 50)
TREBLE +/ qh (30, 57) TUNER ws (22, 32, 33, 36) TUNING +/ 5 (32) VIDEO 1 qk (22) VIDEO 2 w; (22)

BUTTON DESCRIPTIONS

ENTER wl (36) FM (Except for models of area code CEL, CEK) ed (31, 32) FM/AM (Models of area code CEL, CEK only) es (31, 32)
?/1 (power) 1 (4, 15, 20, 21, 30, 31, 54) Abbreviation CEK : UK model. CEL : AEP model.
NAME 8 (36) PHONES (jack) ek (22, 51) PRESET/PTY SELECT +/ (Models of area code CEL, CEK only) 3 (33, 34)
qaqsqdqf qg qhqjqkqlw; waws
eh eg ef ed es ea e; wl wk wj wh
STR-K740P/K840P SECTION 2 TEST MODE

FACTORY PRESET MODE

* All preset contents are reset to the default setting. * Procedure: While depressing the VIDEO 1 and the 2CH buttons simultaneously, press the power ?/1 button to turn on the main power. The message FACTORY appears and switch off the set. While depressing the VIDEO 1 and the 2CH buttons simultaneously, press the power ?/1 button again. The message FACTORY appears and the present contents are reset to the default values. 3. Press the VIDEO button, confirm display
SP.OFF C ((( SL ))) SR DIGITAL DTS OPT MULTI CH IN EQ MONO NEWS dB Hz ft. MEMORY
MULTI CHANNEL DECODING , 2CH , SURR and NAME LED turn on. 4. Press the VIDEO button, All segments turn off. 5. Every pressing of the VIDEO button turns on each segment and LED one after another in the same order. (Not only the VIDEO button, but also the other buttons such as DVD/LD , TV/SAT , MD/TAPE , CD , TUNER and AUX can be used.)

AM CHANNEL STEP 9 KHZ/10 KHZ SELECTION MODE
* Either the 9 kHz step or 10 kHz step can be selected for the AM channel step. * Procedure: Set the FUNCTION to AM. Turn off the main power. While depressing the TUNING+ button or the PRESET+ button, press the power ?/1 button to turn on the main power. Either the message 9 k STEP or 10 k STEP appears. Select the desired step. * For US/Canadian/E model only

SOUND FIELD CLEAR MODE

* The preset sound field is cleared when this mode is activated. Use this mode before returning the product to clients upon completion of repair. * Procedure: While depressing the MODE button, press the power ?/1 button to turn on the main power. The message SURR. CLR. appears and initialization is performed.
SPEAKER SIZE SELECTION MODE
*Either Normal Speaker or Micro Satellite Speaker can be selected. *Procedure: While depressing the LEVEL button, press the power ?/1 button to turn the main power. Either the message NORM. SP. or MICRO SP. is displayed. Select the desired speaker size.

DEMONSTRATION MODE

* Demonstration is performed. * Procedure : While depressing the SET UP button, press the power ?/1 button. The message appears and demonstration is performed. * To finish DEMONSTRATION MODE, press the power ?/1 button while the introduction message appears in the display.
FLUORESCENT INDICATOR TUBE TEST MODE
* All fluorescent segments are tested. When this test is activated, all segments turn on at the same time, then each segment turns on one after another. * Procedure: While depressing the MD/TAPE and the SHIFT buttons simultaneously, press the power ?/1 button to turn on the main power. 1. All segments turn on.
SW L SLEEP SP.OFF C R DDDIGITALPRO LOGIC DTS MPEGSTEREO MONO RDS OPT COAX MULTI CH IN D.RANGE EQ TA NEWS INFO dB kHz mft. MHz MEMORY MUTING
SOFTWARE VERSION DISPLAY MODE
* The software version is displayed. * Procedure: While depressing the ENTER and the A.F.D buttons simultaneously, press the power ?/1 button to turn on the main power. The model name, destination and the software version are displayed.

(((LFE))) SL S SR

KEY CHECK MODE
* Button check * Procedure: While depressing the VIDEO 1 and the SHIFT buttons simultaneously, press the power ?/1 button to turn on the main power. REST 39 appears. (AEP, UK, model: RESET 38) Every pressing of any button other than ?/1 and SPEAKERS counts down the buttons. The buttons which are already counted once are not counted again. When all buttons are pressed REST 00 appears. When MASTER VOLUME is rotated in clockwise direction, VOL MIN, VOL 1 to VOL 48, VOL MAX appear.
MULTI CHANNEL DECODING , Digital Cinema Sound , A.F.D. , MODE , 2CH and SET UP LED turn on. 2. Press the VIDEO button, confirm display.
SW L LFE S SLEEP R k m MHz DD COAX PRO LOGIC MPEGSTEREO D.RANGE TA RDS INFO MUTING
A.F.D. , MODE , LEVEL , SET UP , and Digital Cinema Sound LED turn on.

AUTO BETICAL MODE

* This mode is installed in the Europe models only. When this mode is used, the receiver scans the broadcasts that can be received by the tuner, and sets up the broadcasts. Be sure to start scanning after connecting the antenna. * Procedure: 1. Check that the antenna is connected. 2. Press the ?/1 button to turn on the power while pressing the MEMORY button. 3. The message AUTO-BETICAL SELECT appears and the receiver starts scanning.
STR-K740P/K840P SECTION 3 DIAGRAMS
3-1. Circuit Board Location
STANDBY board POWER SW board
AC SELCT board (E model only) VIDEO board

MAIN board

DIGITAL board HEADPHONE board DISPLAY board
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this necessary note is printed in each block.)
For schematic diagrams. Note:
All capacitors are in F unless otherwise noted. p : pF. 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. % : indicates tolerance. f : internal component. 2 : nonflammable resistor. 5 : fusible resistor. C : panel designation.
Note: The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Note: Les composants identifis par une marque 0 sont critiques pour la scurit. Ne les remplacer que par une pice portant le numro spcifi.
For printed wiring boards. Note:
X : parts extracted from the component side. a : Through hole. f : internal component. : Pattern from the side which enables seeing.

Waveform DIGITAL Board

1 IC1101 wa (XOUT)

4.4Vp-p

These are omitted.

81ns (12.288MHz)

B C E These are omitted.

2 IC(MCLK1)

A : B+ Line. B : B Line. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. No mark : FM Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. Waveforms are taken with a oscilloscope. Circled numbers refer to waveforms. Signal path. F : FM J : CD (ANALOG) c : DVD (DIGITAL) Abbreviation CND : Canadian model MY : Malaysia model SP : Singapore model AR : Argentine model MX : Mexican model

Caution: Pattern face side: (Side A) Parts face side: (Side B)

3.3Vp-p

Parts on the pattern face side seen from the pattern face are indicated. Parts on the parts face side seen from the parts face are indicated.

73ns (13.59MHz)

3 IC1601 id (XI)

2.8Vp-p

5ns (20MHz)
3-2. Block Diagrams MAIN Section
TUNER PACK FM 75 COAXIAL ANTENNA AM AM L CH FM R CH ST-DO ST-DI CLK CE STEREO TUNED MUTING AEP, UK RDS-DATA RDS-INT FM SIG OUT 53 RDS DATA 52 RDS CLOCK 43 RDS SIGNAL DVD/LD AUDIO IN 78 SLATCH 74 STEREO 73 TUNED 75 MUTING MD/TAPE IN OUT CD IN R-CH IC1601(1/3) SYSTEM CONTROL. 76 DO J402
IC201 ANALOG SOUND PROC. 1 L IN8
L OUT L INL REC3 Q361 MUTING

JL INL IN5

J404 VIDEO 2 AUDIO IN AUDIO OUT VIDEO 1 AUDIO IN J201 MONITOR VIDEO OUT VIDEO IN VIDEO 1 VIDEO OUT VIDEO 2 DVD/LD VIDEO IN VIDEO IN JV1 OUT 5 VDVD SWD204 SWJ1101 D203 COAXIAL DVD/LD IN IC5 ICSW4 SW88 SW3 IC103 VIDEO SELECT 1 M.OUT 13 V1 SW89 SW2 SURROUND MULTI CH IN SUB WOOFER CENTER IC1101 DIGITAL AUDIO I/F RECEIVER 5 DIN2 IC7 DIGITAL IC1105 OPTICAL VIDEO 2 IN OPTICAL IN 4 DIN1 CK OUT 13 BCK 14 LRCK 15 IC1201 AUDIO DSP 22 KFSIBCKILRCKI2 SCK OUT 14 BCKOLRCKO 19 IC1 IC1501 AUDIO CODEC 29 LIN30 LIN+ 39 MCLKI 4 BCK 5 LRCK R OUTSDISDODATAO 16 DDO 36 DI 38 CLK 37 CE 34 ERROR 17 XSTATE 48 XMODE 47 CKSEL1 XIN 22 XOUT 21 AUDIO GPGPHD OUT 33 HD IN 34 HCLK 36 HCS 32 HACN 113 PM 56 BST 2 XRST X1101 12.288MHz 59 EXLOCK MCLKMCLKX1201 13.5MHz SRAM 43 CDT1 ICCCLK 41 CS 17 PD 3 S.MUTE Q1601,1602 MUTING CONT 30 SDI2 SDOSDO9 SDTO 6 SDTISDTISDTIDATA 21 CLK 22 LATCH 32 DSW IN L OUT31 DC IN L OUTL OUT27 DL IN 13 ASL IN 16 ASW IN 15 AC IN SW90 SW1 J401 FRONT 11 AL IN 62 L INL INL REC1

SL OUT 47 Q365 MUTING

C OUT 39 Q363 MUTING

10 AL OUT

SW OUT DSL IN Q364 MUTING

Q379 MUTING SWITCH

IC1604 EEPROM SDA DSCL 6

HD OUT

F.MUTING

XSTATE

CKSEL1

ANA/DIG

R-CH is omitted due to same as L-CH. Signal Path : FM : CD(ANALOG) : DVD (DIGITAL)

33 MDMD2 51

+3.3V CNS3 MD0 VDD MD2 FLASH 1 FLASH 2 RESET FOR FLASH PROGRAMMING
IC1601(2/3) SYSTEM CONTROL
SP SWITCH/FLASH FLASH 2 27

DISPLAY/POWER Section

R-CH IC701 POWER AMP +V OUTQ701,702 LIMITER L R-CH is omitted due to same as L-CH Signal Path : FM 8 IN2 NFRYMUTING -V OUTIC702 POWER AMP +V OUTQ651,652 LIMITER SL 8 IN2 NFRY601 Q640 AF POWER PROTECT Q654 BOOSTER Q655,656 CURRENT DETECT D733 Q610 RELAY DRIVE C CENTER Q653 BOOSTER R-CH SPEAKERS TM601 SR SURROUND SL Q704 BOOSTER Q705,706 CURRENT DETECT Q740 AF POWER PROTECT D731 Q710 RELAY DRIVE R-CH R Q703 BOOSTER Q790 RELAY DRIVE TM602 L FRONT J791 PHONES RY791

1 MUTING -V OUT2 11

POWER AMP IC501 +V OUT 6 Q501,502 LIMITER C 1 IN+ IN- 2 RY501 Q540 AF POWER PROTECT -V OUT 5 Q504 BOOSTER Q505,506 CURRENT DETECT D721 +2.5V 5 +2.5V REG IC1903 AUDIO OUT SUB WOOFER +5V +5V 3 REG 1 D902-905 T901 D734 Q550 RELAY DRIVE +3.3V 2 Q503 BOOSTER

IC1901 +3.3V REG 4

FL101 FLUORESCENT INDICATOR TUBE 5 IC401 7
Q722,723,725 PROTECT SWITCH RY560
IC100 FL DRIVE SWSWSWQ107-111 LED DRIVE
Q560 RELAY DRIVE D111-114 Q747,748 POWER MUTING

SEG1-16 GRID1-12

D802 +B -B POWER AMP -B 2 IC5 ICFL101 -30V Q801 -30V REG D820-823 RELAY +B AUDIO +7V 1 IC801 +7V REG IC802 AUDIO -7V FUSE DETECT 55 AUDIO +5V IC102 REMOTE 1 CONTROL RECEIVER 3 IC1503 +5V REG 1 VIDEO +5V -7V REG IC807 +5V REG ICS901 VOLTAGE SELECTOR 2 F1 FFD898 K740P:E/K840P:E MODEL ONLY 3 D899
9 D100-104 Q691,692 -B SW
IC101 BUFFER Q100-104 LED DRIVE

+3.3V 63

DIN FL_STB CLK

Q471 +3.3V REG

BLUE LED MODE LED 2CH LED AFD LED DCS LED

AC MUTING

PROTECTOR

HEADPHONE RELAY

PREOUT/FRONT RELAY

REAR RELAY

CENTER RELAY

WOOFER RELAY

HP DETECT

SIRCS 54

SYSTEM CONTROL IC1601(3/3)
K740P:AEP,UK K840P:AEP,UK IC1905 TUNER +3.3V 3 +3.3V 1 REG

VIDEO -5V

-5V REG IC1902

TUNER +10V

+10V REG IC1904

AVCC 35 VCCVCC5 23

POWER RELAY POWER KEY
+3.3V(STBY) 3 ICRESET 2 Q921 AC DET
+3.3V 1 REG D910-913 T902 AC IN D914 D915 RY901 Q901 RELAY DRIVE

RSTX 77 STOP 48

VOL(B)

VOL(A)

X1601 20.0MHz
3 FUNCTION KEY S100-109 FUNCTION KEY S110-119 FUNCTION KEY S120-128 FUNCTION KEY S130-137, S143,144

1 S145 ?/1

ENCODER RV102 MASTER VOLUME
3-4. Schematic Diagram DIGITAL Section (1/2)
See page 9 for Waveform. See page 23 for IC Block Diagrams.

IC B/D

3-5. Schematic Diagram DIGITAL Section (2/2)
See page 9 for Waveform. See page 25 for IC Pin Function Description.

3-7. Schematic Diagram MAIN Section (1/2)
See page 23 for IC Block Diagrams.
3-8. Schematic Diagram MAIN Section (2/2)
3-10. Schematic Diagram DISPLAY Section
See page 24 for IC Block Diagrams.
3-11. Printed Wiring Board VIDEO Section
See page 8 for Circuit Boards Location. : Uses unleaded solder.
3-12. Schematic Diagram VIDEO Section
3-13. Printed Wiring Board POWER Section
: Uses unleaded solder. See page 8 for Circuit Boards Location.
K740P:US, CND/K840P:US, CND

(CHASSIS)

EXCEPT K740P:E/K840P:E

K740P:E/K840P:E

CNP801 (Page 15)

CNP802 (Page 15)

3-14. Schematic Diagram POWER Section
F901 2.5V/250V : EXCEPT K740P:US,CND/K840P:US,CND,MX 6.3V/125V : K740P:US,CND/K840P:US,CND,MX