Kenwood KRC-V879R Service Manual

KRC-V879R

K3i

B NRLOUD SCAN REP MTL/M.RDM

AUD

PROG /PTY

DAB

ANG

CLK

PWR OFF

47Wx4

DOLBY B NR

B.S/RDM

DISP NAME.S

TI VOL ADJ

KRC-V879R /RY

M&T CASSETTE RECEIVER

SERVICE MANUAL

2001-2 PRINTED IN KOREA

B51-7748-00 (K) 1940

The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05. Please refer to the service manual for model D40-1122-05(B51-7452-00).

DC cord (E30-4942-05)

Remote com. assy (A70-2015-15)

Remote com. assy (A70-0886-15)

Antenna adaptor (T90-0523-05)

Screw set (N99-1704-05)

Torsion coil spring (G01-2924-04)

Lever (D10-4562-04)x2

Mounting hardware assy (J21-9716-03)

Plastic cabinet assy (A02-1497-03)

Front glass (B10-3241-01)

Escutcheon assy (B07-3007-03)

Panel assy (A64-2135-02)

CA-R66

MASK-key

40%

AUDIO

S-METER

AFC

IFC OUT

PLL DATA

PLL CLK

SW5V

FM AM

TAPE CHANGER

S METER

QUAL

SDA

SCK

S MUTE

A 8V

MODE 2

SUB-

MOT+B

SUB+

MODE 1

MS MODE

F/R

MUTE

MTL ON/OFF

BOLBY B/C

DOLBY ON/OFF

MS OUT

R REEL F REEL

MODE 3

PACK IN

SRM SW2

SRM SW1

RCLK QUAL RDATA NOISE S METER AFC

IFC OUT PLL DATA PLL CLK

MS OUT

MTL ON/OFF

MODE 2 MODE 3

R REEL

MODE 1

F REEL

MS MODE

F/R

MUTE

DOLBY ON/OFF

DATA C

CH RST CH MUTE

DOLBY B/C

DATA H CH CON

CH CLK REQ H REQ C

PACK IN

SRM SW3

SRM DET

RESET

SUB MOT2

SUB MOT1

SUB MOT3

CASS/SRM

MOTOR

ILL ON

AM+B

FM+B

SCK

SDA

PRE MUTE

MUTE

BEEP

P MUTE

ACC DET

PHONE

DIMMER

EXT AMP CONT

P CON

PAN5V

P ON

ANT CONT

B.U DET

SW5V

CH MUTE

CH RST

DATA H

DATA C

CH CON

REQ C

CH CLK

REQ H

BACK UP

1200mV

440mV

A 8V

SW5V

PANEL5V

B.U.5V

PANEL5V

FL+B

FAC

SUB+ SUB-

SUB-

SUB+

SDA

SCK

MOT+B

FOR VFD

A8V

-B

FOR 4.5V PRE

PAN5V

B.U.5VSW5V

MUTE

AUX IN

BACK UP

SW5V

B.U.5V

B.U.5V +B

-B

1800mVTAPE

3600mV

855mV

1372mV

600mV

3600mV

1800mV

E TYPE K TYPE

1800mV

2250mV 1715mV

4500mV

1069mVAM

TAPE

E TYPE

ILL

TEL MUTE

ACC

ANT CON

P CON

BACK UP

EXT.AMP CONT

F/E

FM+B

BUFFER

NOISE

BUFFER

DECODER

RDS

IC11

Q73

IC2

E-VOL

MPX

N.C.

AM+B

CASSETTE MECH

SYSTEM U-COM

IC1

CD-CHANGER MD-CHANGER

KEY

MATRIX

RESET

LCD

DRIVER

REMO

G/R SW

RESET

IC15

X13-996/999

SYSTEM u-COM LCD TYPE

IC1

U-COMMATRIX

RESET

LCD

IC1

X13-995/998

KEY

REMO

PANEL

G/R SW

V-ILL TYPE

LCD

DRIVER

IC2

VFD(GRADATED)

RESET

X13-994/997

REMO

MATRIX

KEY

G/R SW

U-COM

IC1

PANEL

FL(GRADATED) TYPE

ROM

SPEANA

BPF

DRIVER

SUB MOT

IC13

E S

SYSTEM

IC5,ONLY FL MODEL

MAIN MOT

SUB MOT

Q42

Q37,38

DC/DC

A1 ONLY FL MODEL

Q33,34

ILL AVR

ONLY FL MODEL

DC/DC

A 8V

Q20

IC6

SW14V

Q36

EXT AMP CONT

DIMMER

ACC DET

TEL MUTE

P CON

B.U DET

ANT CON

Q39

Q32

Q25

Q26

Q28

Q24

SW5V B.U.5V

PAN5V

Q45

Q23 Q21,22

SRM

MECH

POWER IC

THEMO

PROTECT

IC4

IC10

MUTE LOGIC

DRIVER

MUTE

Q1-6 ONLY FL MODEL

4.5V

PRE AMP

IC7-9

SP OUT

1.8V PRE OUT

4.5V PRE OUT

LCD

251mV(ETYPE)

470mV(KTYPE)

FM:

AM: 230mV

KRC-V879R/RY

BLOCK DIAGRAM

KRC-V879R/RY

COMPONENT DESCRIPTION

(X13-9950-11) (X13-9982-72)

Component Purpose • Function Operation • Conditions • Compatibility

IC1 Panel u-CON IC2 LCD Driver IC3 Remocon IC Q1 V Q2 Key Illumination (Red) SW ON when the base goes "H". Q3 Key Illumination (Green) SW ON when the base goes "H". Q4 Remocon IC supply SW ON when the base goes "L". Q5 Illumination (Red) SW ON when the base goes "H". Q6 Illumination (Green) SW ON when the base goes "H". Q7 Illumination (Blue) SW ON when the base goes "H".

(X14-6442-70) (X14-6452-72)

Component Purpose • Function Operation • Conditions • Compatibility

IC1 System u-com IC2 E-VOL, N.C, MPX IC3 Regulator IC for Audio 8V

IC4 Power IC IC10 Mute logic IC IC11 RDS decoder IC13 Motor driver IC IC15 Reset IC

Q1~4 PRE OUT MUTE SW Pre outs are muted when the base goes "H".

Q18~20 Audio 8V AVR

Q21, 22 B.U 5V AVR

Q23 SW 5V ON when the base goes "L". Q24 B.U detection ON when the base goes "H" during B.U applied. Q25 ACC detection ON when the base goes "H" during ACC applied.

Q26, 27 P-ANT SW Q26 is turned ON when Q27's base goes "H". Q28~31 P-CON SW Q28 is turned ON when Q31's base goes "H".

Q32 Dimmer SW ON when the base goes "H" while vehicle small lamps turn on.

Q33, 34, 44 Illumination AVR ON when Q44's base goes "H".

Q36 SW 14V ON when base goes "H".

Q37, 38 Motor driver supply Q38 is turned ON when Q37's base goes "H".

Q39 External Amp Control ON when the base goes "L".

Q41, 42

Q43 Motor driver's voltage SW

Q45, 46 Panel 5V SW Q45 is turned ON when Q46's base goes "H".

Q71 Pre out mute driver ON when the base goes "L". Q72 E-VOL Mute SW ON when the base goes "H". Q73 Noise buffer Q85 IFC out buffer

Q86, 88 AM+B SW Q88 is turned ON when Q86's base goes "H". Q87, 89 FM+B SW Q89 is turned ON when Q87's base goes "H".

Q90 Composite out buffer

AVR ON when the base goes 9.1V during ILL+B applied.

LCD

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".

Cassette mecha main motor supply SW

Q42 is turned ON when Q41's base goes "H". Base "H" ··· cassette mecha's submotor

Base "L" ··· mask mecha's motor.

(X87-3022-71) (X87-3032-73)

Component Purpose • Function Operation • Conditions • Compatibility

IC1 Playback EQ, Dolby & Blank Detection Q1 Constant Switching in Blank Detection Switches the time constant according to the PLAY or FF/REW mode.

KRC-V879R/RY

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC049 (IC1: X14)

SYSTEM MICROCOMPUTER

Pin Name I/O Purpose Operation Description

1 AM+B O AM power supply terminal. During AM operation: H

2 FM+B O FM power supply terminal.

3 AFS O Constant switching when noise is detected.

4 PLL-DATA I/O DATA input/output terminal from/to F/E. 5 PLL-CLK I/O CLOCK input/output terminal from/to F/E. 6 Evdd - Positive power supply terminal. 7 GND - Grounding terminal. 8 N.C O No connection.

9 BEEP O Beep output terminal. 10 REMO I Remote control input terminal. 11 P-ON O SW 14 V control terminal. Power ON: H, Power OFF: L

12 P-STBY O Power IC STBY terminal control.

13 IC2-SDA I/O IC2 DATA line. 14 IC2-SCK O IC2 CLOCK line.

15 P-MUTE O Power IC muting terminal.

16 PRE-MUTE O Pre-Out muting terminal. During momentary power down: L 17

18 TEST - Test pin. 19 P-CON O Power control terminal. Power ON: H, Power OFF: L 20 ANT-CON O Antenna control terminal. TUNER, TI ON: H

21 MUTE O Muting terminal.

22 N.C O No connection. 23 ACC-DET I Acc detection terminal. Acc detected: L, Acc not detected: H 24 DIMMER I Small detection terminal. ON: L, OFF: H 25 SW-5V O 5 V power supply terminal. ON: L, OFF: H 26 CH-MUTE I Muting request from CH. ON: H, OFF: L 27 CH-CON O CH control output. ON: H, OFF: L 28 CH-REQH O Request output to CH. Requested: L

29 CH-RST O Reset output to CH.

30 EXT-AMP-CONT O External amplifier control terminal (In 200 ms). L 70 ms: Bass boost LOW

31 RESET I Reset input terminal Normal: H, Reset: L

32 XT1 I Sub-clock connection terminal.

33 XT2 - Sub-clock connection terminal.

34 REGC -

35 X2 - Main clock connection terminal. Power OFF or momentary power

SC CON Panel u-COM control. P-ON: H

Output terminal for the capacitor in the regulator in u-COM.

During FM operation: H Last FM with RDS model: H During FM seek or AF search: L During reception: H

Power IC OFF: L, Power IC ON: H During reset: Input

Power OFF: L, All OFF: L During TEL muting: L

ON: Open, OFF: L The time constant is 0.48 ms with all models.

Normal: L. When the system is reset,turns H then L in 400 ms after recovery from reset. L 40 ms: Bass boost OFF

L 100 ms: Bass boost HIGH

The clock count is active even when Power is OFF.

Power ON: Oscillated

down: Oscillation stopped

KRC-V879R/RY

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC049 (IC1: X14)

SYSTEM MICROCOMPUTER

Pin Name I/O Purpose Operation Description

36 X1 I Main clock connection terminal. 37 Vss - Grounding terminal. 38 Vdd - Positive power supply terminal. 39 CLKOUT O Internal System Clock output. 40 N.C O No connection.

41 MOTOR O

42 MODE3 I Cassette mechanism mode detection terminal. 43 MODE1 I Cassette mechanism mode detection terminal. 44 MODE2 I Cassette mechanism mode detection terminal. 45 N.C O Outputs Low. No connection. 46 SUB1 O Sub-motor output terminal (1). 47 SUB2 O Sub-motor output terminal (2). 48 SUB3 O Sub-motor output terminal (3).

49 CAS/SRM O

50 N.C O Outputs Low. No connection. 51 N.C O Outputs Low. No connection. 52 ILL-ON O FL +B output terminal. ON: H, OFF: L 53 PAN-5V O Panel 5 V control terminal. 54 N.C O Outputs Low. No connection. 55 BVdd - Positive power supply terminal. 56 BVss - Grounding terminal. 57 N.C No connection. 58 N.C No connection. 59 N.C O Outputs Low. No connection. 60 N.C O Outputs Low. No connection. 61 ST TYPE1 I IC2 destination type terminal. Default: L 62 ST TYPE0 I IC2 destination type terminal. Default: L 63 SRM-SW1 I Panel position detection switch 1.

64 PAN-RESET O Reset output to Panel u-COM. Momentary power down: L

65 MC-REQ/PANEL REQ terminal for panel and u-COM. Panel detected: L 66 SRM-SW3 I Panel position detection switch 3. 67 SRM-SW2 I Panel position detection switch 2. 68 FWD/REV O TAPE EQ input switching terminal. FWD: L, REW: H

69 MS-CONT I/O TAPE input: L

70 AVCONT O AD reference voltage control output.

71 Avdd - Positive power supply terminal. 72 Avss - Grounding terminal.

73 Avref I

74 PHONE I PHONE detection terminal.

75 R-REEL I Cassette mechanism reel pulse input (REV). Vth = 2.5 V

Cassette mechanism main motor When the motor is running: H output terminal. When it is stopped: L

Cassette mechanism/SRM mechanism Cassette mechanism: H voltage switching terminal. SRM mechanism: L

Normal: H, Reset: L, Panel detached: L

Microcomputer overrun: L

During TAPE PLAY: H

Constant switching terminal in case of blank detection.

Reference voltage supply terminal for A/D converter.

During TAPE FF/REW or other than

Cassette mechanism detected: L Cassette mechanism not detected: H Same timing as P-ON. H during operation.

TEL MUTE: No more than 1 V NAVI MUTE: 2.5 V or more

KRC-V879R/RY

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC049 (IC1: X14)

SYSTEM MICROCOMPUTER

Pin Name I/O Purpose Operation Description

76 F-REEL I Cassette mechanism reel pulse input (FWD). Vth = 2.5 V 77 N.C I No connection. Connected to GND 78 SRM-DET I SRM mechanism detection. SRM mechanism detected: L 79 NOISE I FM noise detection terminal. Model without RDS: Connected to GND 80 S-METER I Signal meter detection terminal.

81 R-DATA I RDS decoder DATA input terminal.

82 R-QUAL I RDS decoder QUAL input terminal.

83 IFC-OUT I F/E IFC OUT input terminal. Station detected: L

84 MUSIC I Music blank detection input.

85 PACK-DET I Cassette mechanism pack detection terminal.

86 DOLBY O Dolby ON/OFF switching. ON: H, OFF: L

87 R-CLK I RDS decoder CLK input terminal.

88 CH-REQC I Request input from CH. ON: L 89 SC-REQ Communication request from Panel u-COM.

90 N.C I No connection. Connected to GND.

91 EQ-MUTE O EQ muting switching.

92 MTL O NORMAL/METAL switching. NORMAL: H, METAL: L

93 BU-DET I Momentary power down detection terminal.

94 CH-DATAC I DATA input terminal from CH. 95 CH-DATAH O DATA output terminal to CH. 96 CH-CLK I/O CLOCK input/output terminal from/to CH. 97 SC-DATA DATA line from Panel u-COM. 98 MC-DATA DATA line to Panel u-COM. 99 MC-CLK CLK line to Panel u-COM.

100 N.C O Outputs Low. No connection.

Model without RDS and RBDS: Connected to GND Model without RDS and RBDS: Connected to GND

Music signal detected: L Music signal not detected: H Cassette pack detected: L Cassette pack not detected: H

Model without RDS and RBDS: Connected to GND

During TAPE PLAY: L During TAPE FF/REW: H Other than TAPE input: H

Back-Up detected: L Back-Up not detected (momentary power down): H

KRC-V879R/RY

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD780076GK501 (IC1: X13)

Panel MicroComputer

Pin Name I/O Purpose

1 REMO_ON O Remote control 5 V switching. 2 RED O 2-color LED switching. 3 GREEN O 2-color LED switching. 4 KR5-1 I Key return port. 9 Vss - -

10 VDD_0 - -

11-14 KS4-1 O Key scan port.

15 MC_DATA I DATA input port from system u-COM. 16 SC_DATA I/O DATA output port from Panel u-COM. 17 MC_CLK I CLK input port from system u-COM. 18 L_CE O Enable output port to LCD driver. 19 L_DATA O DATA output port to LCD driver. 20 L_CLK O CLK output port to LCD driver. 21 NC O 22 TYPE I Destination type switching port. 23 L_INH O Display ON/OFF output port to LCD driver. 24 Vdd_1 - 25 AVss - -

26-33 N.C. I No connection (Fixed at GND).

34 AVref - Connected to GND. 35 NC O No connection (Open and outputs Low). 36 RESET I Reset port. 37 XT2 - Open. 38 XT1 I Pulled up to VDD. 39 TEST I Flash u-COM rewrite port (normally Low). 40 X2 - Main system clock. 41 X1 I Main system clock. 42 Vss1 - 43 MC REQ I Request input port from system u-COM. 44 SC_CON I Panel u-COM ON/OFF port. 45 SRC I SRC detection. 46 OPEN-EJECT I Interrupt port for OPEN/EJECT keys. 47 CONT_G O Switching output port to variable illumination. (Green) 48 SC_REQ O Request input port from Panel u-COM. 49 NC O 50 CONT_B O Switching output port to variable illumination. (Blue) 51 N.C. O No connection. 52 CONT_R O Switching output port for variable illumination. (Red) 53 EJECT I Ejection detection port.

54-64 N.C. O No connection.

KRC-V879R/RY

TEST MODE

M&T-SRT 2001 Model Test Mode

1. How to enter the test mode

• While holding the FM and Preset 6 keys, reset the unit.

2. How to exit from the test mode

• While holding the Preset 6 key, reset the unit.

• (Note) The test mode cannot be terminated by Acc OFF, power OFF or momentary power down.

3. Initial status in the test mode

• Sources: All OFF.

• Display: All segments are lit.

• Volume: -10 dB (displayed as 30)

• Loudness: OFF

• CRSC: OFF regardless of the presence of switching function.

• SYSTEM Q: Flat.

• Blank Skip: OFF. (C/R model)

• LED: White for no scanning. (VLCD 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 î Forced Wide î Forced Middle î Forced Narrow î 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

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 î No. 15 î No. 10 î No. 11 î No. 12 î No. 13 î No. 14 î 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.

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.

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)

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.)

KRC-V879R/RY

TEST MODE

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)

PRESET1 (Display)

SYS xxxxxxxx System microcomputer PAN xxxxxxxx Panel microcomputer

PRESET2

PRESET3 Long press/hold: Clear power ON time.

PRESET4

PRESET5 Long press/hold: Clear TAPE/CD/MD ejection

PRESET6 Long press/hold: Clear Panel open/close count.

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.)

(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.

count. (Display) EjeTim xxxxx Max. 65535 (times) Short press: Display Panel open/close count.

(Display) PnCnt xxxxx Max. 655350 (times)

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 2zone is ON.

• Pressing and holding the CLK key for a second in the All OFF status the Mask Key (security) write mode.

7 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.

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