Kenwood KRC-PS979R, KRC-PS989R Service Manual

SIZE AAA BATTERY (Not supplied)

50Wx4

K3i

DOLBY B-C NR

OFF

DAB

AUD

VOL ADJ

REP

LOUD

PROG/PTY

4.5V

PREOUT

SCAN

B C NR

B S/RDM

MTL/M.RDM

DISC

NAME

ANG

DISC

SRC

CLK

KRC-PS979R System E's+

50Wx4

K3i

DOLBY B-C NR

OFF

DAB

AUD

VOL ADJ

REP

LOUD

PROG/PTY

4.5V

PREOUT

SCAN

B C NR

B S/RDM

MTL/M.RDM

DISC

NAME

ANG

DISC

SRC

CLK

KRC-PS989R System E's+

KRC-PS979R /PS989R

M&T CASSETTE RECEIVER

SERVICE MANUAL

2001-2 PRINTED IN KOREA

B51-7747-00 (K) 2162

KRC-PS979R

KRC-PS989R

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 (E30-4956-05)

Remote com. assy (A70-2015-15)

Remote com. assy (A70-0886-15)

Antenna adaptor (T90-0523-05)

Screw set (N99-1704-05)

Stay (J54-0606-04)

Torsion coil spring (G01-2924-04)

Lever (D10-4562-04)x2

Mounting hardware assy (J21-9716-03)

Plastic cabinet assy (A02-1497-03)

DC cord (E30-4941-05)

Remote com. assy (A70-0883-05)

Escutcheon assy (B07-3010-02)

Bracket L (J19-5051-03)

Screw set (N99-1652-05)

Front glass (B10-3240-01)

Escutcheon assy(ebony) (B07-3006-03)

Panel assy (A64-2133-02)

Front glass (B10-3238-01)

Escutcheon assy(black) (B07-3007-03)

Panel assy (A64-2131-02)

CA-R66

MASK-key

RC-500

Bracket R (J19-5052-03)

KRC-PS979R

KRC-PS989R

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-PS979R

KRC-PS979R/PS989R

BLOCK DIAGRAM

KRC-PS979R/PS989R

COMPONENTS DESCRIPTION

(X13-9940-10)

Component Purpose • Function Operation • Conditions • Compatibility

IC1 Panel u-COM IC2 Spectrum Analyzer IC IC3 Remote Control IC IC4 ROM IC5 3.3 V Regulator Power supply for the 3.3 V drive IC and FL tubes (logic). IC6 Buffer IC Converts 5.0 V to 3.3 V.

Q2 IC2/3 Power ON/OFF SW Switches power OFF when the base is "H", or ON when the base is "L".

FL Tube VDD1/VDD2 Timing When the base of Q5 is "H", IC3 is activated to switch FL tube VDD1

Q3, 5 Adjustment & Panel u-COM SC CON ON and SC CON ON. When it is "L", FL tube VDD1 and SC CON are

ON/OFF SW both OFF.

Q6, 7 Key Illumination SW

Q8 SRC Key Illumination ON/OFF SW Turns illumination ON when the base is "H" or OFF when it is "L".

FL BLK Signal Logic Inverter & 5.0 V to 3.3 V Converter

Turns green illumination ON when the base of Q6 is "H" or OFF when it is "L". Turns red illumination ON when the base of Q7 is "H" or OFF when it is "L".

(X14-6420-20) (X14-6432-70)

Component Purpose • Function Operation • Conditions • Compatibility

IC1 u-COM IC2 E-VOL, MPX & NC IC3 8 V AVR IC IC4 Power IC IC5 HPF & LPF Variation IC

IC6

IC7~9 4.5 V PRE-OUT Opamp

IC10 Muting Logic IC IC11 RDS Decoder

IC13

IC15 Reset IC IC16 Spectrum Analyzer AGC Opamp

Q1~6 Pre-Out Muting SW Tr. Switches PRE-OUT muting ON when the base is "H".

Q19 8 V Power SW Tr. Turns ON when the base is "H". Q20 8 V Power Tr.

Q22, 21 B-U 5 V Power Tr.

Q23 SW 5V SW Tr. Turns ON when the base is "L". Q24 B-U Detection Tr. Back-Up voltage is detected when the base is "H". Q25 Acc Detection Tr. Acc voltage is detected when the base is "H".

Q28,29,30,31 P-CON SW.

Q32 Dimmer Detection Tr. Dimmer ON is detected when the base is "H". Q35 SW14 SW Tr. Turns ON when the base is "H".

Q36, 37 Motor Driver Tr.

Q39 External Amp Control

Q41,42 C-Mechanism Main Motor Power Tr. Turns ON when the base is "H".

Q43

Q45 Panel 5 V SW Tr. Turns ON when the base is "L".

Q55, 56 4.5 V PRE Negative Power Reg. Turns ON when the base of Q55 is "H".

4.5 V PRE-OUT Negative Power Supply

Storage Mechanism/C-Mechanism Motor Driver

Storage Mechanism/C-Mechanism Switches to the cassette mechanism motor voltage when the base is Motor Power Tr. "H", or the storage mechanism motor voltage when it is "L".

KRC-PS979R/PS989R

COMPONENTS DESCRIPTION

(X14-6420-20) (X14-6432-70)

Component Purpose • Function Operation • Conditions • Compatibility

Q57, 58, 59

Q60, 61, 62

Q71 PRE-Out Muting Driver Tr. Turns PRE-OUT muting ON when the base is "L". Q72 E-VOL Muting SW Tr. Turns Electronic Volume muting ON when the base is "H".

Q73 Noise Detection Buffer Q86, 88 AM +B SW Tr. Switches AM +B ON when the base of Q86 is "H". Q87, 89 FM +B SW Tr. Switches FM +B ON when the base of Q87 is "H".

Q90 Composite Buffer

Q402 DC/DC Power SW Tr. Turns ON when the base is "H".

Q403,404 DC/DC Power Tr.

Q405 Spectrum Analyzer AGC Tr.

(X87-3020-20) (X87-3032-70)

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.

4.5 V PRE Negative Power Differential Amp Tr.

4.5 V PRE Positive Power Differential Amp Tr.

KRC-PS979R/PS989R

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC058 (IC1: X13)

Panel MicroComputer

Pin Name I/O Purpose Operation Description

1 DATA1 O DATA communication with FL driver. 2 CLK O CLK communication with FL driver. (Data shift at positive going) 3 NC I No connection. 4 DATA2 O DATA communication with FL driver. 5 CLK IN I CSI2 serial clock input. (For sync between Data 1 and 2) 6 EVDD - PAN. 5 V 7 EVSS - Ground. 8 RED O Illumination RED switching. H: ON, L: OFF

9 GREEN O Illumination GREEN switching H: ON, L: OFF 10 REMO I Input from Remote Control IC. 11 LATCH O Latch for FL driver. 12 GCP O Illumination gradation control. 13 REMO ON O Remote Control IC power ON/OFF. H: ON, L: OFF

14-16 A13-15 O Address.

17 BLK O Display for FL driver.

18 TEST I Internally connected.

19-30 A5-12,A1-4 O Address.

31 RESET I Reset. L: Reset, H: Reset released 32 TX1 - Grounded. 33 TX2 O 34 REGC - Regulator stabilizing capacitance connection. 35 X2 - Main clock. 36 X1 - Main clock. 37 VSS - Grounded. 38 VDD - PAN. 5V.

39-42 NC O No connection.

43 OE O Output Enable. 44 CE O Chip Enable. 45 NC O No connection. 46 BLUE O BLUE LED ON/OFF. H: ON, L: OFF

47-54 AD0-7 I DATA for external ROM.

55 BVDD - PAN. 5 V. 56 BVSS - Grounded.

57-64 AD8-15 I DATA for external ROM. 65-68 A16-19 O Address.

69 - O No connection. 70 A20 O Address. PAN. 5 V. 71 AVDD - PAN. 5V. 72 AVSS - Grounded. 73 AVREF 74 F01 I BPF (63Hz) 75 F02 I BPF (150Hz) 76 F03 I BPF (330Hz) 77 F04 I BPF (1kHz) 78 F05 I BPF (3.3kHz) 79 F06 I BPF (10kHz) 80 WAVE IN I Audio input.

81-85 KR5-1 I KEY RETURN

86 SC REQ O Request communication with System Controller. 87 NC O No connection. 88 SC CON I Panel u-COM control. During operation: H 89 OPEN I OPEN KEY H: ON, L: OFF

Blanking display. H: Display ON, L: Display OFF

KRC-PS979R/PS989R

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC058 (IC1: X13)

Panel MicroComputer

Pin Name I/O Purpose Operation Description

90 SOURCE I SOURCE KEY H: ON, L: OFF 91 VREF CON O VREF CONTROL During operation: H 92 MC REQ I Request input from System Controller. 93 KS4 O KEY SCAN 94 KS3 O KEY SCAN Flash u-COM write port. (DI) 95 KS2 O KEY SCAN Flash u-COM write port. (DO) 96 KS1 O KEY SCAN Flash u-COM write port. (CLK) 97 MC DATA I DATA communication with System Controller. 98 SC DATA I/O DATA communication with System Controller. 99 MC CLK I CLK input from System Controller.

100 NC I No connection.

UPD703033GC048 (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 N.C I No connection. 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 N.C O No connection. 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).

During FM operation: H Last FM with RDS model: H During FM seek or AM 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 70 ms: Bass boost LOW. L 100 ms: Bass boost HIGH.

KRC-PS979R/PS989R

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC048 (IC1: X14)

SYSTEM MICROCOMPUTER

Pin Name I/O Purpose Operation Description

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.

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 TYPE1 I Destination type switching port. 58 TYPE0 I Destination type switching port. 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.

65 MC-REQ REQ terminal for u-COM. 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

70 AVCONT O AD reference voltage control output.

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

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

Constant switching terminal in case of blank detection.

The clock count is active even when Power is OFF.

Power ON: Oscillated Power OFF or momentary power down: Oscillation stopped

Normal: H, Reset: L, Panel detached: L Momentary power down: L Microcomputer overrun: L

During TAPE PLAY: H During TAPE FF/REW or other than TAPE input: L Cassette mechanism detected: L Cassette mechanism not detected: H Same timing as P-ON. H during operation.

KRC-PS979R/PS989R

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC048 (IC1: X14)

SYSTEM MICROCOMPUTER

Pin Name I/O Purpose Operation Description

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 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 I Communication request from Panel u-COM. 90 B/C I Dolby B/C switching. DOLBY B: L, DOLBY C: H

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 I DATA line from Panel u-COM. 98 MC-DATA I/O DATA line to Panel u-COM. 99 MC-CL I/O CLK line to Panel u-COM.

100 N.C O Outputs Low. No connection.

Reference voltage supply terminal for A/D converter.

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

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-PS979R/PS989R

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.)

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