CASSETTE RECEIVER

KRC-794/Y

SERVICE MANUAL

2002-12 PRINTED IN JAPAN B53-0012-00 (N) 1874
The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05. Please refer to the service manual for model D40-1122-05(B51-7542-00).

Panel assy (A64-3030-02)

Front glass (B10-4398-01)
Knob(PROG) Knob(FM,AM) Knob(SRC) (K25-1406-03) (K24-3835-04) (K25-1407-03)

KRC-794

DOLBY B NR

DAB ANG

PROG/PTY
LOUD B NR SCAN B.S/RDM REP MTL/M.RDM

TI VOL ADJ

DISP NAME.S

CLK MENU

Knob(VOL) (K25-1404-13)

Knob(1-6) (K25-1405-12)

Knob(UP,DW) (K25-1408-03)
Front glass (B10-4222-03)

DC cord (E30-4942-05)

Remote controller assy (A70-0886-15)
Antenna adaptor (T90-0523-05)

Screw set (N99-1704-05)

MASK-key
Plastic cabinet assy (A02-1497-13)

Lever (D10-4562-04)x2

Torsion coil spring (G01-2924-04)
Remote controller assy (A70-2025-05)
Mounting hardware assy (J21-9716-03)

RC-410

SDA SCK

AM+B FM+B

S-METER IFC OUT PLL DATA PLL CLK 3
RCLK QUAL RDATA NOISE S METER IFC IFC OUT PLL DATA PLL CLK
PRE MUTE MUTE P MUTE BEEP EXT AMP CONT DIMMER

THERMO PROTECT

AC GND

SRM SW1

SRM SW2 SRM DET

MOTOR ILL ON

SW5V A 8V
SUB MOT1 SUB MOT2 SUB MOT3 CASS/SRM

Q89 Q88

FM+B AM+B Q90 BUFFER SW5V
FM: AM: 460mV(KTYPE) 170mV 245mV(ETYPE)

B.U.5V

Q1-4 MUTE DRIVER E-VOL N.C. MPX IC10

S MUTE

IC11 RDS DECODER

388mV 1200mV TAPE AM

1.8V PRE OUT
E TYPE K TYPE TAPE 1800mV 1800mV FM 1372mV 1800mV AM 855mV 600mV CH 3600mV 3600mV

CHANGER S METER QUAL

Q73 BUFFER

MUTE LOGIC

BACK UP

POWER IC SP OUT IC1

BLOCK DIAGRAM

EXT AMP CONT DIMMER Q32

EXT AMP CONT ILL TEL MUTE

CASSETTE MECHA

MS OUT BOLBY B/C DOLBY ON/OFF MUTE MTL ON/OFF F/R MS MODE R REEL F REEL MODE 1 MODE 2 MODE 3 TAPE IN SUB+ SUBMOT+B MS OUT DOLBY B/C DOLBY ON/OFF MUTE MTL ON/OFF F/R MS MODE R REEL F REEL MODE 1 MODE 2 MODE 3 TAPE IN CH CLK REQ H REQ C DATA C DATA H CH CON CH RST CH MUTE

SYSTEM u-COM

PHONE ACC DET ANT CONT
TEL MUTE ACC DET ANT CON Q28-31 P CON

Q25 Q26,27

ACC ANT CON P CON

P CON B.U DET P-5V SW5V

Q24 B.U DET

Q45 Q23

SW5V B.U.5V

Q21,22 B.U.5V BACK UP

A8V P ON

SW14V Q36 Q33,34

CD-CHANGER MD-CHANGER
CH CLK REQ H REQ C DATA C DATA H CH CON CH RST CH MUTE

2 SW5V SUB+ SUB2

4 SUB+ SUB- IC13

SRM MECH DET SRM MECH

ILL AVR Q37,38 SUB MOT AVR MAIN MOT AVR Q41,42

SUB MOT DRIVER

(X16-154X-XX)

MOTHER u-COM LCD TYPE

IC2 REMO PANEL5V RESET SW KEY MATRIX LCD G/R SW DRIVER IC1 Q3,4

COMPONENTS DESCRIPTION

q SWITCH UNIT(X16-1540-12)

Component

IC1 IC2 Q1 Q3,4 Q5 Q6 Q7

Purpose Function

LCD DRIVER with Key Matrix Remote Control IC Key Detection SW Key Illumination SW VLCD Reference Voltage Supply Remote Control IC Power Supply Dimmer SW
Operation/Condition/Compatibility
Q2 starts key scan in M&T. Lights key illumination in Red when the base of Q3 is ON. Lights key illumination in Green when the base of Q4 is "H" Constant voltage circuit. Activates remote control when the base of Q6 is "L". The base of Q7 is normally "H" but becomes " " when DIMMER is ON.
q SYNTHESIZER UNIT(X14-6442-73)
IC1 IC2 IC3 IC4 IC10 IC11 IC13 IC15 Q1~4 Q18~20 Q21, 22 Q23 Q24 Q25 Q28~31 Q32 Q36 Q37,38 Q39 Q41, 42 Q43 Q45,46 Q71 Q72 Q73 Q85 Q86,88 Q87,89 Q90
System -com E-VOL, N.C, MPX Regulator IC for Audio 8V Power IC Mute logic IC RDS decoder Motor driver IC Reset IC PRE OUT MUTE SW Audio 8V AVR B.U 5V AVR SW 5V B.U detection ACC detection P-CON SW Dimmer SW SW 14V Motor driver supply External Amp Control Cassette mecha main motor supply SW Motor driver's voltage SW Panel 5V SW Pre out mute driver E-VOL Mute SW Noise buffer IFC out buffer AM+B SW FM+B SW Composite out buffer
Pre outs are muted when the base goes "H". Inverted darlington connection Q20 is turned ON when Q18's base goes "H". Inverted darlington connection Q22 is turned ON when Q21's base goes "H". ON when the base goes "L". ON when the base goes "H" during B.U applied. ON when the base goes "H" during ACC applied. Q28 is turned ON when Q31's base goes "H". ON when the base goes "H" while vehicle small lamps turn on. ON when Q44's base goes "H". ON when base goes "H". Q38 is turned ON when Q37's base goes "H". ON when the base goes "L". Q42 is turned ON when Q41's base goes "H". Base "H". cassette mecha's submotor Base "L". mask mecha's motor. Q45 is turned ON when Q46's base goes "H". ON when the base goes "L". ON when the base goes "H".

Pin No. Name 47 SUBSUB90 CAS/SRM N.C N.C ILL-ON PAN-5V N.C BVdd BVss TYPE1 TYPE0 N.C N.C ST TYPE1 ST TYPE0 SRM-SW1 D/A-SDA L CE SRM-SW3 SRM-SW2 FWD/REV MS-CONT AVCONT Avdd Avss Avref PHONE R-REEL F-REEL N.C SRM-DET NOISE S-METER R-DATA R-QUAL IFC-OUT MUSIC PACK-DET DOLBY R-CLK CH-REQC KEY REQ N.C I/O O O O O O O O O I I O O I I I O I/O I I O I/O O I I I I I I I I I I I I I O I I I I Description Sub-motor output terminal (2). Sub-motor output terminal (3). Cassette mechanism/SRM mechanism voltage switching terminal. Outputs Low. Outputs Low. FL +B output terminal. Panel 5 V control terminal. Outputs Low. Positive power supply terminal. Grounding terminal. Destination type switching port. Destination type switching port. Outputs Low. No connection. Outputs Low. No connection. IC2 destination type terminal. IC2 destination type terminal. Panel position detection switch 1. D/A clock line. (V-LED) CE terminal for LCD driver. Panel position detection switch 3. Panel position detection switch 2. TAPE EQ input switching terminal. Processing Operation
Cassette mechanism: H. SRM mechanism: L. No connection. No connection. ON: H, OFF: L Panel detected: H Panel not detected: L No connection.
Default: L. Default: L. Panel detached: L. Momentary power down: L.
FWD: L. REW: H. During TAPE PLAY: H. During TAPE FF/REW or other than TAPE input: L. Constant switching terminal in case of blank detection. Cassette mechanism detected: L. Cassette mechanism not detected: H. AD reference voltage control output. Same timing as P-ON. H during operation. Positive power supply terminal. Grounding terminal. Reference voltage supply terminal for A/D converter. TEL MUTE: No more than 1 V. PHONE detection terminal. NAVI MUTE:2.5 V or more. Cassette mechanism reel pulse input (REV). Vth = 2.5 V. Cassette mechanism reel pulse input (FWD). Vth = 2.5 V. No connection. Connected to GND. SRM mechanism detection. SRM mechanism detected: L. FM noise detection terminal. Model without RDS: Connected to GND. Signal meter detection terminal. Model without RDS and RDS decoder DATA input terminal. RBDS: Connected to GND. Model without RDS and RDS decoder QUAL input terminal. RBDS: Connected to GND. F/E IFC OUT input terminal. Station detected: L. Music signal detected: L. Music blank detection input. Music signal not detected: H. Cassette pack detected: L. Cassette mechanism pack detection terminal. Cassette pack not detected: H. Dolby ON/OFF switching. ON: H. OFF: L. Model without RDS and RDS decoder CLK input terminal. RBDS: Connected to GND. Request input from CH. ON: L. Communication request from LCD driver. No connection. Connected to GND.

Pin No. Name EQ-MUTE MTL BU-DET CH-DATAC CH-DATAH CH-CLK L-DATA L L-DATA S L-CLK N.C I/O O O I I O I/O I I/O I/O O Description EQ muting switching. NORMAL/METAL switching. Momentary power down detection terminal. DATA input terminal from CH. DATA output terminal to CH. CLOCK input/output terminal from/to CH. DATA line from LCD driver. DATA line to LCD driver. CLK line to LCD driver. Outputs Low. No connection. Processing Operation During TAPE PLAY: L. During TAPE FF/REW: H. Other than TAPE input: H. NORMAL: H. METAL: L. Back-Up detected: L Back-Up not detected (momentary power down): H.

Panel detected: L

TEST MODE
M&T-SRT Model Test Mode
1. How to enter the test mode
While holding the FM and Preset 6 keys, reset the unit.
7. Audio-related specifications
A short press of the Q key initiates the audio adjustment mode. Pressing the key on the remote initiates the audio adjustment mode. Continuous holding of a remote control key is inhibited. Bass, Middle and Treble are adjusted in 3 steps of Min/ Center/Max with the Track Up/Down keys. Balance is adjusted in 3 steps of Left Max/Center/Right Max with the Track Up/Down keys. Fader is adjusted in 3 steps of Rear Max/Center/Front Max with the Track Up/Down keys. HPF is adjusted in 2 steps of Through/220 Hz with the Track Up/Down keys. LPF is adjusted in 2 steps of Through/120 Hz with the Track Up/Down keys. Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble f are not dealt with by the audio adjustment.
2. How to exit from the test mode
While holding the Preset 6 key, reset the unit. (Note) The test mode cannot terminated by Acc OFF, power OFF or momentary power down.
3. Initial status in the test mode
Sources Display Volume Loudness CRSC : All OFF. : All segments are lit. : -10 dB (displayed as 30) : OFF : OFF regardless of the presence of switching function. SYSTEM Q : Flat. Blank Skip : OFF. (C/R model) LED : White for no scanning. (VLCD model)
8. Menu-related specifications
A short press of the CLK key initiates the Menu mode. Pressing the DNPP/SBF key on the remote initiates the Menu mode. Continuous holding of a remote control key is inhibited. Calendar adjustment, calendar display switching and calendar memo are eliminated from the targets of continuous key holding. (FL model). In the color adjustment mode, pressing the Preset 1 key sets Red, 2 sets Blue, 3 sets Green and 4 sets Green. (VLCD model) Contrast is adjusted in 3 steps of 0/5/10 and the default is 5. (VLCD/LCD model) Brightness is adjusted in 3 steps of 0/5/10 and the default is 10. (Normal FL model)

4. Special display in Tuner mode
When any of the following messages is displayed in Tuner mode, the front end may be abnormal. "TNE 2P NG": The EEPROM is set to the default (unstable values) because the F/E was shipped without passing through the adjustment process, etc. "TNCON NG": Communication with the F/E is not possible.
5. Forced switching of K3I
Each press of the Preset 6 key in Tuner mode should switch K3I from AUTO Forced Wide Forced Middle Forced Narrow AUTO. The initial status is AUTO and the display shows these modes as follows. AUTO : FMA Forced Wide : FMW Forced Middle : FMM Forced Narrow : FMN
9. Backup current measurement
When the unit is reset while Acc is OFF (i.e. by turning Back-Up ON), the MUTE terminal goes OFF in 2 seconds in place of 15 second. (The panel, CD mechanism and TAPE mechanism are not activated at this time.)
6. Test mode specifications of the CD receiver
Forced ejection is inhibited in the reset start operation. When the unit is reset while a CD is loaded in it, the CD is not recognized by resetting. Each press of the Track Up key jumps to the following track numbers. No. 9 No. 15 No. 10 No. 11 No. 12 No. 13 No. 14 No. 9 (The cycle restarts from here.) Each press of the Track Down key jumps to the previous track number to the track being played.
10. Special display when the display is All ON
Pressing the Preset keys while the power is All OFF displays the following information. Version display (8 digits, Month/Day/Hour/Minute) (Display) SYS xxxxxxxx System microcomputer PAN xxxxxxxx Panel microcomputer Serial No. display (8 digits) (Note) CD/R K type eXcelon model (Display) SNo. xxxxxxxx Short press: View power ON time. (The All OFF period is not counted.) Long press/hold: Clear power ON time. (Display) PonTim xxxxx Max. 65535 (hours) Short press: Display TAPE/CD/ MD operation time. Long press/hold: Clear TAPE/CD/MD operation time. (Display) CDTime xxxxx (CD/R) TapTim xxxxx (C/R) Max. 65535 (hours) Short press: Display TAPE/CD/ MD ejection count. Long press/hold: Clear TAPE/CD/MD ejection count. (Display) EjeTim xxxxx Max. 65535 (times) Short press: Display Panel open/close count. Long press/hold: Clear Panel open/close count. (Display) PnCnt xxxxx Max. 655350 (times)
s Security-related information
Forced Power ON mode (All models) Even when the security (Mask key) is approved, resetting the unit while holding the ATT and Preset 4 keys makes it possible to turn the power ON for 30 minutes. After 30 minutes have elapsed, it is not possible to return to the previous condition unless the unit is reset again. Method of registration of the security code after EEPROM (Tuner Unit Ass'y) replacement (Code security model) 1. Enter the test mode. (See 1 How to enter the test mode) 2. Press the CLK key to enter the security registration mode. 3. Enter the code using the Preset 1/2/3/4 keys. Example: To enter "3510" Press the Preset 1 key 4 times. Press the Preset 2 key 6 times. Press the Preset 3 key twice. Press the Preset 4 key once. 4. Press and hold the DISP key for 3 seconds until "APPROVED" is displayed. 5. Exit from the test mode. (See 2 How to exit from the test mode) (Note) All Clear is not applicable to the security code of this model. Simplified method of clearing the security code (K Type only) 1. While the code entry is requested, press and hold the VOL UP key for 3 seconds while holding the DISP key pressed.(This should turn ---- off.) 2. Enter "KCAR" from the remote. (Same way as the 00 model) Press the 5 key on the remote twice, then press the Track Up key. (This enters "K") Press the 2 key on the remote 3 times, then press the Track Up key. (This enters "C") Press the 2 key on the remote once, then press the Track Up key. (This enters "A") Press the 7 key on the remote twice, then press the Track Up key. (This enters "R") 3. The security code is cleared and the unit enters the All OFF mode. 4. If you commit a mistake in the code entry, the unit enters the code request mode again.

PRESET1

PRESET2

PRESET3

PRESET4

PRESET5

PRESET6

11. Other specifications

Automatic panel closing when a tape/CD is inserted is inhibited. (M&T model) Panel operation by turning power OFF/ON is inhibited. (M&T model) Pressing the ATT key opens or closes the panel. (M&T model) Messages such as "CODE OFF" are not displayed when power is turned ON. Pressing the TI (AUTO) key during changer operation turns 2zone ON. 2zone can be turned OFF by pressing the TI (AUTO) key again. The P/S dot lights while 2 zone is ON. Pressing and holding the CLK key for a second in the All OFF status the Mask Key (security) write mode.
Method of writing the Mask key while the EEPROM is in the initial status 1. Enter the test mode. (See 1 How to enter the test mode) 2. Press the CLK key to enter the Mask key registration mode. "TRANSMIT1" should be displayed now. The display at this time should show "< >" in place of "[ ]". 3. Point the Mask key remote toward the light sensor, and press and hold its key for more than 0.5 second. 4. When "TRANSMIT2" is displayed, press and hold the key on the Mask key remote for more than 0.5 second again. The first and second counter codes are not compared at this time. 5. When "APPROVED" is displayed, the write operation is complete. Now the demonstration mode is initiated and the test mode is terminated. (Note) In the same way as previous models, if 30 minutes have elapsed with no code written, an error occurs and the power is turned OFF. Method of initializing the Mask key (How to reset the unit from the Mask key approved condition to the factory condition) 1. Enter the test mode. (See 1 How to enter the test mode) 2. "TRANSMIT1" is displayed and the Mask key entry request mode is initiated. The display at this time should show "" in place of "[ ]". 3. Press and hold the key on the Master key remote for more than 3 seconds. 4. When "TRANSMIT2" is displayed, press and hold the key on the Master key remote for more than 3 seconds. 5. When "APPROVED" is displayed, the Mask key is cleared, the demonstration mode is initiated, the test mode is terminated and the unit returns to the factory condition. Method of clearing all Mask key-related data 1. Enter the test mode. (See 1 How to enter the test mode) 2. Press the CLK key to enter the Mask key registration mode. "TRANSMIT1" should be displayed now. 3. Point the Master key remote toward the light sensor, and press and hold its key for more than 3 seconds (until the level display shows the full condition). 4. When "TRANSMIT2" is displayed, hold the key on the Mask key remote for more than 3 seconds again. If "TRANSMIT1" is displayed in place of "TRANSMIT2", restart the procedure from step 3. 5. When "APPROVED" is displayed, all security data is cleared and the unit returns to the condition before Mask key writing with the EEPROM in the initial status.

R352 TH1 R315 R112

Q30 Q29

W105 R89 R90

Q27 D32

BE C83

R87 EB

R190 R94 R93 R92

R74 R2 R3 R1

R126 E
Ref. No address Ref. No address Ref. No address Ref. No address IC3 5M Q21 6M Q33 6L Q72 3M IC10 3M Q23 4M Q37 5L Q88 2M IC15 4L Q29 5L Q41 5L Q89 2M Q18 6M Q30 5L Q43 5L Q19 6M Q31 5L Q45 5K
DTA123JK DTA124EK DTC114YK DTC124EK DTC143TK DTC143ZK DTC144EK KRC103S UN5213 2SA1576A 2SB1218A 2SB709A 2SC2412K

2SB1548

DAN202K

(X14-6442-73)

FL+ FLWHT WHT/BLK GRY/BLK GRY BLU/WHT BLU/WHT RED BLK GRN GRN/BLK VIOL/BLK VIOL PNK/BLK BRN ORG/WHT YEL REQ H CH CON MUTE D GND A GND R27 B.U. RST 100K +B 29 R74 4.7K RL+ RLRRRR+ EXT. CONT. TEL MUTE

DAP202K 2SB1277 2SB1443

FRFR+ ANT. CON

TC74HC02AF

R72 4.7K

2SB1188

2SA1037K 2SC4081 M5237ML

RR+ RRFR+ FRFL+ FLRL+

DC CORD (E30-4942-05) : KRC-794/Y

2SB1184

DTA114EUA DTC144EUA KRC104S

TDA7479D

(X87-3022-71)

VR2 10K

(X87-3022-71) IC1 : CXA2560Q Q1 : DTC124EK or KRC103S

C8 0.01 R12 1K

EQ AMP

C14 0.1 0.1

26 0V 28 27

R7 20K

DOLBY OFF,B : 0.4V C:
FF,REW : 0V PLAY : 4.05V FWD REV : 0V : 4.84V METAL ON : 0V OFF : 4.84V MUTE ON : 4.77V OFF : 0V

PB OUT2

LINE OUT2

OUT REF2

TAPE IN2

CN3 Lch REV

C16 33u50 +

R6 180

TAPE MECHA (D40-1146)

C4 470P

13 D GND
31 PB FBPB R IN2 0V 4.06V PB GND

MS 20 MODE 19 DR SW 18

4.06V 4.02V

TAPE SW

PACK IN SW S1
12 TAPE IN MS MODE 10 F/R 5 MTL MUTE DOLBY ON/OFF DOLBY B/C MS OUT

C2 470P

PB F IN2 4.06V VCT
Rch FWD Lch CM1 CM2 MAIN SUB M M

C5 33u10 +

C1 470P R1 24K C3 470P R3 24K WSUB+ 2 SUB3 MOT+B 4 MOT-G MODE3
DOLBY ON : 4.43V 17 MUTE SW OFF : 0V 16 DOLBY NR SW 15 B : 0V NR MODE C : 4.73V

MS OUT 12 11

4.06V 0V 4.06V

C15 33u10 R5 + 180 4.06V

PB REF PB F IN1 PB GND
OUT REF1 TAPE IN1 PB OUT1

PB R IN1 PBTC1 PB FB1

4.02V 8.11V

VCC NC

LINE OUT1

DOLBY OFF : 0.4V B,C :

MSLPF TCH1 TCL1

MSTC G1FB G2FB

DPSS : 4.94V PLAY 0V DPSS : 0V PLAY : 2.9V
R10 33K C17 0.47 R9 2.7K 4700P R8 220K

0.47 C24 0.033

22K 22K

C13 0.1 8

C11 0.1

C7 0.01

R11 1K

R14 10K

C6 47u10 +

VR1 10K

7 +5V E

MODE2 PON 5V F REEL

SUPPLY REEL

6 MOED1

MODE SW SUPPLY

R13 4.7

10 ANODE 11 R REEL 12 NC

TAKE UP

TAKEUP REEL

X14-6442-73 (1/4)

+B +B 8V OUT R A GND OUT L

R73 4.7K

R71 100

DC IN J1 J3 TOP VIEW

RL+ FL+

RR+ FR+

ANT EXT. AMP CONT

P-CON TEL MUTE

DIMMER ACC

GND F1 10A L12 BUP +B +B

AUX IN

CH CON

CH CLK

DATA C

DATA H

R74 4.7K

R75 4.7K

R76 4.7K

R77 47

R78 47

C111 0.47u50 + R312 10K R131 47K R134 1.5K

R3 4.7

C3 47u6.3 +

15 R135

R136 3.9K

5V 0V 5V 0V

C114 1u50 +

PRE OUT MUTE DRIVER

93 +B +B 2 R97 12K D36

3 R107 4.7K 4

+B C91 0.068 C90 3.3u25

B. U DETECTION

R98 12K R99 5.6K

E-VOL. N.C.,MPX

NC 26 4.15V 25 4.15V FL FL FR FR RL RL RR RR C131 0.01
C133 2.2u50 + CC1 VREF CREF

R104 4.7K

C88 1000P

NC O FL O FR

4.15V 2 4.15V 3

R109 R108 1K 1/2W 22K

R110 1K 1/2W Q28-31

C92 0.1u50

R101 100K R102 100K 1/2W C96 0.01 R100 3.3K

ACC. DETECTION D37

R103 18K

C89 0.01

P-CON SW

0.01 R169 10K

C135 0.47

R126 2.2

C136 150P
TAPE IN MS MODE F/R MTL MUTE DOLBY ON/OFF DOLBY B/C MS OUT +B 10 12

47K 47K

C94 1u50

R111 10K C93 0.01

R114 560
52 R112 100K +5V +5V ILL +B +B +5V +5V

B.U.5V AVR

+B +5V C85 100u6.3

Q23 R96

2.2K R95 22K +

+8V R87 24K 25 11

AUDIO 8V AVR

R92 220

13.5V VCC 2
OUT 2 OUT IN 48 IN 3 13.5V 7 +B VCC 1 IN 1 CC87 220u10 + OUT 1 VREF GND
OUT R A GND OUT L C82 100u25 R93 22K C83 0.01

S METER 5V 0V

0V-4.0V

R335 2.2K R333 1K
5.0V 12 +5V VCC C223 10P 13 OSC1 C221 10P 14 OSCTRDCK 5V
: DTC143TK or UN2216 : DTC124EK or KRC103S : DTA124EK or KRA103S : 2SB1548(P) : 2SC2412K or 2SD601A : 2SA1037K or 2SB709A : 2SB1277(Q,R) : DTC114YK or KRC107S : DTC144EK or KRC104S : 2SB1184 : UMC2N : 2SB1443 : DTA123JK or KRA105S : 2SA1576A or 2SB1218A : DTC144EUA or UN5213 : 2SB1188(Q,R)

MASK MECHA

6 SUB + SW 1 SW 3 GND SRM DET SW 2 SUB 1

C10u6.3

11 VDD D GND NC 2 REMO PAN RESET DIMMER CONT L-DATAL L-DATAS RESET L-CE L CLK ILL GND ILL +B VDD 13 D GND 12 N.C. 11 REMO 10 PAN RESET 9 DIMMER 8 L-DATAL L-DATAS 7 6

(X16-1180-10)

S.GND 13 VDD 12 D GND 11 N.C. 10 REMO 9 PAN RESET 6 DIMMER L-DATAL L-DATAS

98 RST R376 470

R377 1K

X16J1 2/2

R375 1K RRR372 1K R371 1K R370 470
RESET 5 L-CE 4 L CLK 3 ILL GND 2 ILL +B 1
5 RESET 4 L-CE 3 L CLK 2 ILL GND 1 ILL +B S.GND

SIGNAL LINE B LINE

KRC-794/Y (1/2)

KRC-794/Y (X16-1540-12)

S11 S21 S31 S12 S22 S32 S41 S25 S26 S28 S29 S30 S10 S13 S15 S16 S18 S19 S20 S23 S33 S35 S36 S38 S39 S40 S42 S43 SSEG55 COM10 S16 S16 S14 S17 S24 S27 S34 S37 S44 S46 SCOM9 S60 S17 S17 SSSEG54 S 18 S S 59 S S54 S1 S2 S3 S5 S6 S4 S7 S8 S9 S SEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGSEGS56 SEGSEGSEGSEGS55 SSEGSEGSEGSEGSEGSEGSEGSEGSEGS14 SEGS57 SEGSEGSEGSEGSEGSEGSEGSEGSEG8 26

10 SEG60

9 SEG59

8 SEG58 C7 S13 S13 COM7

7 SEG57 S14 S14 COM8 C8

18 COM1

17 COM2

16 COM3

15 COM4

14 COM5

13 COM6

12 COM7

S.GND ILL+B 1 ILLUM G 2

11 COM8

0V 10.7V 0V

CP+10.7V Q5 +10.7V

KSR12 750

L CLK 3 L CE 4

KEY SCAN SW

R14 1K

L DATAL

7 R10 1K

97 DI OUT GND2 0V VCC R2.2 C7 KI1

DIMMER 8

KS6 KI1 KI2 KI3 KI4 KI5 REMO RED GREEN KEY
NC 9 REMO 10 NC 11 D GND 12
KI2 KI3 KI4 KI5 R13 1K 83 84

REMOTE SENSOR IC

Q6 REMO

2.2K 2.2K 2.2K 2.2K

10K 10K

VDD 13 S.GND +5V 0V

R11 4.7 C6 2.2

+5V +B C5 0.1 R5

VDD 5.0V VLCD
VLCD0 6.8V VLCD1 5.1V VLCD2 3.4V VLCD3 1.7V
C4 0.1 C3 0.1 C2 0.1 R6 3.9K +5V

LCD DRIVER

C1 680P R1 43K +5V R7 22K
VLCD4 VSS TEST OSC INH DO CE

5.0V 96

99 100
CL DI S10 S11 S12 S1 S2 S3 S4 S5 S6 S7 S8 S9

X16-1540-12 (1/2)

CP2 1K

L DATAS

RESET 5

X16118 J1

R8 22K

6 SEG56

S45 S46 S48 S49 S44 S47 S50

IC1 IC2 Q1,6

: LC75808W : RS-171 : DTA114EUA or KRA302 : 2SC4081 : DTC143ZK

D1,2 D5-22 D23,24 D26

New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert.
Ref. No. C84 C85 C86 C87 C88 C89 C90 C91 C91 C92 C93 C94 C95 ,96 C98 ,99 C108 C109 C109 C111 C112 C114 C131 C132 C133 C135 C136 C137,138 C137,138 C154 C156 C156 C157 C172,173 C190 C191 C221 C222 C223 C224 C225 C226 C251 C252 C256 C301 C302 C303 C304 C305-307 C308 CN1 CN2 CN3 CN4 J1
E2 : KRC-794 E3 : KRC-794Y A d d N e w
Parts No. C90-2594-05 CE04CW0J101M CK73FB1C105K CE04CW1A221M CK73GB1H102K CK73GB1H103K C90-2598-05 CK73GB1C683K CK73GB1H683K C90-2602-05 CK73GB1H103K C90-2608-05 CK73GB1H103K CK73FB1C224K CK73GB1H103K CK73GB1C104K CK73GB1H104K C90-2606-05 CE04CW1C220M C90-2608-05 CK73GB1H103K CE04CW1A101M C90-2610-05 CK73GB1A474K CC73GCH1H151J CK73GB1C104K CK73GB1H104K CE04DW1A101M CK73GB1E333K CK73GB1H333K CK73GB1H103K CK73GB1H103K C90-2597-05 CK73GB1H103K CC73GCH1H100D C90-2592-05 CC73GCH1H100D CC73GCH1H331J CK73GB1H103K C90-2592-05 CK73GB1H103K CE04CW0J470M CK73EB0J106K CC73GCH1H220J CC73GCH1H270J CK73GB0J105K CK73GB1H102K CK73GB1H103K CK73GB0J105K E40-9557-05 E40-5031-05 E41-0084-05 E40-5036-05 E58-0863-15
Description ELECTRO ELECTRO CHIP C ELECTRO CHIP C CHIP C ELECTRO CHIP C CHIP C ELECTRO CHIP C ELECTRO CHIP C CHIP C CHIP C CHIP C CHIP C ELECTRO ELECTRO ELECTRO CHIP C ELECTRO ELECTRO CHIP C CHIP C CHIP C CHIP C ELECTRO CHIP C CHIP C CHIP C CHIP C ELECTRO CHIP C CHIP C ELECTRO CHIP C CHIP C CHIP C ELECTRO CHIP C ELECTRO CHIP C CHIP C CHIP C CHIP C CHIP C CHIP C CHIP C 10UF 100UF 1.0UF 220UF 1000PF 0.010UF 3.3UF 0.068UF 0.068UF 0.10UF 0.010UF 1.0UF 0.010UF 0.22UF 0.010UF 0.10UF 0.10UF 0.47UF 22UF 1.0UF 0.010UF 100UF 2.2UF 0.47UF 150PF 0.10UF 0.10UF 100UF 0.033UF 0.033UF 0.010UF 0.010UF 10UF 0.010UF 10PF 10UF 10PF 330PF 0.010UF 10UF 0.010UF 47UF 10UF 22PF 27PF 1.0UF 1000PF 0.010UF 1.0UF 10WV 6.3WV K 10WV K K 25WV K K 50WV K 50WV K K K K K 50WV 16WV 50WV K 10WV 50WV K J K K 10WV K K K K 16WV K D 6.3WV D J K 6.3WV K 6.3WV K J J K K K K
Ref. No. J2 J3 WH1 L1 L3 ,4 L5 L6 L7 L8 ,9 L10 L12 X1 X2 X3 P R S V CP1 CP2 CP3 CP4 CP7 CP8 ,9 CP10 R1 ,2 R3 R7 -10 R11 -14 R23 ,24 R33 ,34 R37 ,38 R47 ,48 R71 R72 -76 R77 ,78 R80 -83 R87 R89 R90 R92 R93 R94 R95 R96 R97 ,98 R99 R100 R101,102 R103 R104 R107 R108
Parts No. E63-0853-05 E56-0834-05 E30-4804-05 L33-1039-05 L40-4795-91 L40-4791-17 L40-4795-91 L40-4791-17 L40-4795-91 L92-0075-05 L33-1170-05 L78-0821-05 L77-2738-05 L77-2002-05
Description PIN JACK CYLINDRICAL RECEPTACLE CORD WITH PLUG LINE FILTER COIL SMALL FIXED INDUCTOR(4.7UH,J) SMALL FIXED INDUCTOR(4.7UH,K) SMALL FIXED INDUCTOR(4.7UH,J) SMALL FIXED INDUCTOR(4.7UH,K) SMALL FIXED INDUCTOR(4.7UH,J) CHIP FERRITE CHOKE COIL ASSY RESONATOR CRYSTAL RESONATOR CRYSTAL RESONATOR PAN HEAD TAPTITE SCREW PAN HEAD TAPTITE SCREW PAN HEAD TAPTITE SCREW MACHINE SCREW (M3X5) MULTI-COMP MULTI-COMP MULTI-COMP MULTI-COMP MULTI-COMP MULTI-COMP MULTI-COMP CHIP R 10 CHIP R 4.7 CHIP R 360 CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R SMALL-RD CHIP R CHIP R CHIP R CHIP R SMALL-RD 22K 22K 180 22K 4.7K 47 100K 24K 4.3K 15K 220 22K 100 22K 2.2K 12K 5.6K 3.3K 100K 8K 4.7K 4.7K 1.0K 100K X2 4.7K X4 1K X4 1K X2 2.2K X2 4.7K X2 4.7K X4 J 1/4W J 1/4W J 1/10W J J J J J J J J J D D J J J J J J J J J J J J J J 1/10W 1/10W 1/8W 1/10W 1/8W 1/4W 1/4W 1/4W 1/10W 1/10W 1/10W 1/10W 1/4W 1/10W 1/10W 1/10W 1/10W 1/8W 1/10W 1/2W 1/4W 1/10W 1/8W 1/8W 1/2W

Ref. No. Q43 Q43 Q44 Q45 Q45 Q46 Q46 Q71 Q71 Q72 Q72 Q73 Q73 Q85 Q85 Q86 ,87 Q86 ,87 Q88 ,89 Q90 Q90 TH1 A1 J1 FPCD1 ,2 D5 -18 D20 -22 D23 ,24 ED1 C1 C2 -5 C2 -5 C6 ,7 C11 -J1 CP1 CP2 ,3 R1 R2 -5 R6 R7 ,8 R9 R10 R11 R12
Parts No. DTC114YK KRC107S UMC2N 2SA1576A 2SB1218A DTC144EK KRC104S DTA124EK KRA103S DTC124EK KRC103S 2SC2412K 2SD601A DTC144EUA UN5213 DTC124EK KRC103S 2SB1188(Q,R) 2SC2412K 2SD601A PTH9C42BD471Q X86-3242-70
Description DIGITAL TRANSISTOR DIGITAL TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR TRANSISTOR TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR POSITIVE RESISTOR TUNER UNIT RECTANGULAR RECEPTACLE FLEXIBLE PRINTED WIRING BOARD OPTICAL DIFFUSER REFLECTION SHEET LIGHTING BOARD LED(WHITE) LED(2COLOR PG/RED) LED(2COLOR PG/RED) LED(1608,BLUE) LIQUID CRYSTAL CHIP C CHIP C CHIP C CHIP C CHIP C 680PF 0.10UF 0.10UF 2.2UF 0.010UF J K K K K
SUB-CIRCUIT UNIT (X16-1180-10)
2C 2C E58-0903-05 J84-0121-12
SWITCH UNIT (X16-1540-12)
3C B11-1382-04 3C B11-1383-04 3C B19-2134-03 B30-1571-05 B30-1605-05 B30-1605-05 B30-1564-05 B38-1088-05 CC73GCH1H681J CK73GB1C104K CK73GB1H104K CK73FB1A225K CK73GB1H103K 3C E29-1885-04 E59-0835-05 R90-1016-05 R90-0724-05 RK73GB2A433J RK73GB2A222J RK73GB2A392J RK73GB2A223J RK73GB2A101J RK73GB2A102J RK73GB2A4R7J RK73GB2A361J
CONDUCTIVE RUBBER RECTANGULAR PLUG MULTI-COMP MULTI-COMP CHIP R 43K CHIP R 2.2K CHIP R 3.9K CHIP R CHIP R CHIP R CHIP R CHIP R 22K 100 1.0K 4.470 X4 1K X4 J 1/10W J 1/10W J 1/10W J J J J J 1/10W 1/10W 1/10W 1/10W 1/10W
Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. Ref. No. R13 ,14 R15 ,16 R17 -21 R22 R23 R24 R27 ,28 S28 D26 IC1 IC2 Q1 Q1 Q3 -5 Q6 Q6 Q7 C1 -4 C5 C6 C7 ,8 C11 -14 C11 -14 C15 ,16 C17 C20 C23 C24 C24 CN2 CN3 CN4 R1 -4 R5 ,6 R7 R8 R9 R10 R11 ,12 R13 R14 VR1 ,2 W11 ,12 W14 S1 IC1 Q1 Q2B

3B 3A 3A 3A 2B 2B 2B 2B 2B 2B 2A 1A 3B 2A 1A 1A 3A 3A 2B 2B 1B 2B 1A 2A 3B 3B 1B 1B 1A 1B 1B 1B 2A 2A 2A 3A 3A 3A 3A 2A 2A 2A 2A 2B 2B 2B 3B 3B 1B 1A 1A 2B

J 1/8W J 1/10W

TACT SWITCH ZENER DIODE MOS-IC ANALOGUE IC DIGITAL TRANSISTOR DIGITAL TRANSISTOR TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR DIGITAL TRANSISTOR CHIP C ELECTRO ELECTRO CHIP C CHIP C CHIP C ELECTRO CHIP C CHIP C CHIP C CHIP C CHIP C 470PF 33UF 47UF 0.010UF 0.10UF 0.10UF 33UF 0.47UF 4700PF 0.47UF J 10WV 10WV K K K 10WV K K K
DOLBY NOISE REDUCTION UNIT (X87-3022-71)

0.033UF K 0.033UF K

PIN ASSY FLAT CABLE CONNECTOR PIN ASSY CHIP R CHIP R CHIP R CHIP R CHIP R 24K 180 20K 220K 2.7K J J J J J 1/10W 1/10W 1/16W 1/16W 1/16W 1/16W 1/10W 1/8W 1/16W
CHIP R 33K J CHIP R 1.0K J CHIP R 4.7 J CHIP R 10K J TRIMMING POT.(10K) CHIP R CHIP R 0 OHM 0 OHM

J 1/10W J 1/10W

PUSH SWITCH ANALOGUE IC DIGITAL TRANSISTOR DIGITAL TRANSISTOR CHASSIS ASSY
CASSETTE MECHANISM ASSY (D40-1146-05)

CAPACITORS

CC 45 TH 1H 220 J 1 = Type. ceramic, electrolytic, etc. 2 = Shape. round, square, etc. 3 = Temp. coefficient CC= Voltage rating 5 = Value 6 = Tolerance Color* Capacitor value 010 = 1pF 100 = 10pF 101 = 100pF 102 = 1000pF = 0.001F 103 = 0.01F 0 = 22pF Multiplier 2nd number 1st number L 500
Temperature coefficient 1st Word C L P R S Color* Black Red Orange Yellow Green ppm/C 330 Tolerance (More than 10pF) Code C D G J (%) 0.25 0.5

T Blue 470

U Violet 750
2nd Word G H J K ppm/C Example : CC45TH = 47060ppm/C

X +40 20

Z P No code +80 +100 More than 10F : 10~+0 Less than 4.7F : 10~+75
(Less than 10pF) Code B C D (pF) 0.1 0.25 0.5
Voltage rating 2nd word A 1st word 0 1.1000
1.25 1.6 2.0 2.5 3.15 4.0 5.0 6.3 8.0 12.31.8000

CHIP CAPACITORS

(EX) C C F SL 1H 6 (Chip) (CH, RH, UJ, SL) (EX) C K F 3 (Chip) (B, F) F 4 1H 6 J 7 Refer to the table above. 1 = Type 2 = Shape 3 = Dimension 4 = Temp. coefficient 5 = Voltage rating 6 = Value 7 = Tolerance Dimension

RESISTORS

Chip resistor (Carbon) (EX) R D E B (Chip) (B, F) 2B 6 J 7
Carbon resistor (Normal type) (EX) R D B B 2C 6 (Chip) (B, F) 1 = Type. ceramic, electrolytic, etc. 2 = Shape. round, square, etc. 3 = Dimension 4 = Temp. coefficient
5 = Voltage rating 6 = Value 7 = Tolerance
Chip capacitor Code L Empty 5.60.5 A 4.50.5 B 4.50.5 C 4.50.5 D 3.20.4 E 3.20.2 F 2.00.3 G 1.60.2 H 1.00.05 Chip resistor Code L E 3.20.2 F 2.00.3 G 1.60.2 H 1.00.05 Rating wattage Code Wattage Code 1J 1/16W 2C 2A 1/10W 2E 2B 1/8W 2H
W 5.00.5 3.20.4 2.00.3 1.250.2 2.50.3 1.60.2 1.250.2 0.80.2 0.50.05 W 1.60.2 1.250.2 0.80.2 0.50.05
T Less than 2.0 Less than 2.0 Less than 2.0 Less than 1.25 Less than 1.5 Less than 1.25 Less than 1.25 Less than 1.0 0.50.05 T 1.0 1.0 0.50.1 0.350.05

Wattage 1/6W 1/4W 1/2W

Code 3A 3D

Wattage 1W 2W

SPECIFICATIONS
FM tuner section Frequency range (50 kHz space).. 87.5MHz-108.0MHz Usable sensitivity (S/N = 26dB).. 0.7V/75 Quieting Sensitivity (S/N = 46dB).. 1.6V/75 Frequency response (3 dB). 30Hz-15kHz Signal to Noise ratio (MONO).. 65dB Selectivity (DIN) (400 kHz).. 80dB Stereo separation (1 kHz).. 35dB MW tuner section Frequency range (9kHz Space). 531kHz-1611kHz Usable sensitivity (S/N = 20dB). 25V LW tuner section Frequency range.. 153kHz-281kHz Usable sensitivity (S/N = 20dB).. 45 V Cassetle player section Tape Speed.. 4.76cm/sec. Wow & Flutter (WRMS).. 0.08% Frequency response (3 dB) (70 ms). 30Hz-20kHz Separation (1 kHz)... 43dB Signal to Noise ratio Dolby NR OFF.. 57dB Dolby B NR ON... 65dB Audio section Maximum Output Power.. 50W x 4 Output Power (DIN 45324, +B= 14.4V).. 30W x 4 Tone action Bass... 100Hz 10dB Middle... 1kHz 10dB Treble.. 10kHz 10dB Preout level / Load (during disc play). 1800mV / 10k Preout impedance.. 600 General Operating Voltage... 14.4V (11 - 16V allowable) Current consumption.. 10A Installation Size (W).. 182mm ( H ).. 53mm ( D )... 15 mm Weight... 1.4kg
KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. US and foreign patents licensed from Dolby Laboratories Licensing Corporation.

KENWOOD CORPORATION

2967-3, Ishikawa-machi, Hachioji-shi, Tokyo 192-8525, Japan

KENWOOD USA CORPORATION

P.O. BOX 22745, 2201 East Dominguez Street, Long Beach, CA90801-5745, U.S.A.
KENWOOD ELECTRONICS ITALIA S.p.A.
Via G. Sirtori 7/9, 20129 Milano, Italy
KENWOOD ELECTRONICS CANADA INC.
6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8

KENWOOD IBRICA S.A.