Kenwood KRC-597 Service Manual

CASSETTE RECEIVER

KRC-597/597Y

SERVICE MANUAL

Panel assy (A64-3201-02)

DC cord (E30-6286-05)

Escutcheon (B07-3083-02)

Plastic cabinet assy (A02-1486-13)

Lever (D10-4589-04)

TDF PANEL INFORMATION

MODEL TDF PANEL No. TDF NAME

KRC-597/597Y Y33-1930-68 TDF-597

Screw set (N99-1730-15)

Mounting hardware assy (J22-0011-03)

Antenna adaptor (T90-0523-05)

KRC-597/597Y

BLOCK DIAGRAM

(X14- )

TUNER

AUDIO OUT

S-METER

PLL-DATA

PLL-CLK IFC OUT

SW5V A8V

CASSETTE

FOR(L)

FOR(R)

REV(L)

REV(R)

R REEL

F REEL

MODE1 MODE2 MODE3

MOT +B

SUB+

SUB-

LX REQ S

LX CLK

LX DATA M

LX CON

LX REQ M

LX DATA S

LX RST

LX MUTE

AM+B SW5V A8V

BUFFER

IC9

DOLBY EQ

DOLBY ON/OFF

MTL ON/OFF

MS MODE

Q51

MAIN MOTOR

Q53

SUB MOTOR AVR

IC11

SUB MOTOR DRIVER

BACK UP

MS OUT

MUTE

BACK UP

F/R

IC7

RDS DECODER

E2PROM

SW5V

PANEL DET

SW5V

IC1

SUB+ SUBMOT +B

PANEL DET

EJECT SW

EJECT ILLUMI

R CLK

R DATA

S-METER

QUAL

EJECT ILL

EJECT

(X16- )

LCD DRIVER WITH KEY MATRIX

BUFFER

u-COM

L DATAL

L CE

L DATAS

L CLK

IC2

FM AM MP IN LEVEL CH TAPE AFS QUAL

BU5V

VOLUME B

VOLUME A

IC2IC1

ROT ARY ENCODER

LCD

E-VOL

MPX

I2C CLK

MUTE

I2C DATA

P-MUTE

BEEP

PHONE

ACC DET

B.U DET

RST

EN1 EN2 EN3

REMO

REMOCON

RESET SW

A8V

PANEL 5V

IC6

IC8

RESET

PRE MUTE PRE OUT

IC4

MUTE DRIVER

BU5V

THERMAL PROTECT

SW5V

POWER IC

TEL MUTE

ACC DET

B.U DET

SURGE DET

BU5V

IC3

AM+B FM+B

A8V

ILLUMI

BU5V

POWER SUPPLY IC

SW 5V

SP OUT

BACK UP

TEL MUTE

ACC

BACK UP

WIRED REMO

ANT CON P CON

KRC-597/597Y

DISASSEMBLY FOR REPAIR

How to Disassemble (PANEL ASSY)

1)Remove four screws (A).

2)While holding the section (B) indicated with arrows, pull and remove PANEL ASSY.

How to install knob (SRC)

1)Place knob (F) and knob (G) in the positions indicated in the diagram below.

2)While keeping these positions, use a piece of adhesive tape (H) to hold knobs in position, as shown in the diagarma.

3)Set the rotary (J) position as shown in the diagram.

4) While keeping the letters “SRC” horiz ontally in position, set it to the rotary on the panel.

5)Remove the adhesive tape (H).

3) Pull SWITCH UNIT (C) as indicated in the diagram and remove knob (D). (The knob (D) is attached to the rotary with hook (E) and it is not possible to remove hook (D) only.)

KRC-597/597Y

COMPONENTS DESCRIPTION

● SYNTHESIZER UNIT (X14-9182-71)

Ref. No. Application / Function Operation / Condition / Compatibility

IC1 System µ-COM Controls FM/AM tuner, the changer, cassette mechanism, Panel, volume and tone. IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector.

Bu5V (5V), Audio8V (8V), FM+B (8V), AM+B(8V), P-CON, ANT-CON

IN OUT EN1 ILLUMI 0V OFF 5V ON

IN OUT EN2 AM FM A8V

IC3 Power Supply IC

0V OFF OFF OFF

2.5V OFF ON ON 5V ON OFF ON

IN OUT EN3 ANT-CON P-CON 0V OFF OFF

2.5V OFF ON 5V ON ON

IC4 Power IC Amplifies the front L/R and the rear L/R to 50W or 47W maximum. IC6 Muting logic IC Controls logic for muting. IC7 RDS decoder IC8 Reset IC “L” when detection voltage goes below 3.5V or less. IC9 Equalizer amplifier Dolby-B, Metal-EQ, Equalizer the Tape sound (120µsec).

Sub motor control

IN SUB MOTOR

IN1 (-) IN2 (+)

IC 11 Sub Motor Driver

LLSTOP LHCW HLCCW HHSTANDBY

Q1 Serge Detection

Q2 BACK-UP Detection “L” when B.u is present. “H” when B.u is absent or momentary power down is detected. Q3 ACC Detection “L” when Acc is present.

“L” when the back-up voltage becomes more than 18V (momentary power down). “H” when the back-up voltage becomes less than 18V.

KRC-597/597Y

COMPONENTS DESCRIPTION

Ref. No. Application / Function Operation / Condition / Compatibility

Q4 SW 5V ON when the base is “L”.

Q6 P-CON Detection “H” when P-CON output is short-circuit. Q51 Main Motor SW q Outputs 14V when the base is “L”. Q52 Main Motor SW w Q51 turns ON when the base is “H”. Q53 Sub Motor AVR Output 3.6V when the base of Q4 is “L”. Q54 MSTC SW ON when the base is “H”. Q101 Composite signal buffer

Q151 DSI Driver

Q152 Panel 5V SW

Q201 Noise buffer Q350 Pre Mute SW Drives the Pre Mute sw (Q351~354) when the base is “L”. Q351 Pre Mute SW Mutes the Rear Lch when the base is “H”. Q352 Pre Mute SW Mutes the Rear Rch when the base is “H”.

Power-Antenna “H” when P-ANT output is short-circuit (P.ANT OFF). Detection “L” when FM/AM signal does not exist.

DSI lights when the base is “L”. DSI turns off when the base is “H”. DSI turns on and off when panel is taken off. When the panel is attached, the base goes “L”, turning the Tr ON to supply 5V to the panel. When panel is taken off, panel 5Vcut off.

● SWITCH UNIT (X16-2502-70)

Ref. No. Application / Function Operation / Condition / Compatibility

IC1 LCD Driver Drives LCD IC2 Remote Control IC Controls the unit Q1,4 REMO ON SW The power supply of IC2 is turned on when base level goes “L”. Q2 Key Illumination SW (Green) Lights Green key-illumination when base level goes “H” Q3 Key Illumination SW (Red) Lights Red key-illumination when base level goes “H”

KRC-597/597Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER : MN101C49HNB (IC1 : X14)

Pin No. Pin Name I/O Application

1 VREF- GND for A/D 2F REEL I Reel pulse FWD C mechanism reel pulse output FWD. Vth=2.5V 3R REEL I Reel pulse REW C mechanism reel pulse output REW. Vth=2.5V 4 S-METER I K3I TUNER S-METER 5 IFC-OUT I IF COUNT 0V or 5V 6 NOISE I FM noise DET terminal

7 PHONE I PHONE DET terminal

8 9 GND GND 10 VREF+ VCC for A/D 11 VDD µ-com main VCC 12 MAIN OSC1 Main oscillation input 8.38MHz 13 MAIN OSC2 Main oscillation input 14 VSS µ-com main GND 15 SUB OSC1 32.768kHz oscillation input 16 SUB OSC2 32.768kHz oscillation input 17 GND GND External ROM 18 LX-DATAM O DATA output terminal to CH Retain last 19 LX-DATAS I DATA input terminal from CH 20 LX-CLK O CLK input/output terminal with CH 21 FLASH READ O 22 FLASH WRITE O 23 FLASH CLK O 24 BEEP O Beep for internal amp 25 PANEL-DET I DET terminal for panel DET or no panel DET Panel no DET : L, Panel DET : H 26 REMO I Remote control input 27 R-CLK I CLK for RDS decoder No destination : Output fixed to L 28 LX-REQS I Request input from CH Request DET : L 29 B.U-DET I Momentary power dropped detection 30 EJECT I Tape eject L : KEY input 31 KEY-REQ I Communication request from LCD driver L : KEY input 32 VDD I VDD 33 RESET I Reset

34 EQ MUTE O EQ MUTE

35 DOLBY O B NR ON/OFF

DCDET RESERVE

ITurn lLLUMI down when DE DET is not used DC offset DET terminal for P-IC

Truth Value

Table

Processing Operation Description

TEL MUTE : 1V or less NAVI MUTE : 2.5V or less 1V or less, 2.5V or more and NAVI MUTE only for J

BU DET : L, B.U-DET (momentary power dropped) : H

During TAPE PLAY : L, During TAPE FF/REW : H, In other modes than TAPE : H B NR ON : H, B NR OFF : L, In other modes than TAPE : Retain value

KRC-597/597Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

36 MUSIC I Tape between-music DET Music signal DET : L, Music signal no DET : H 37~40 NC O 41 VDD I VDD 42 L DATAS O TXD for LCD 43 L DATAL I RXD for LCD 44 L CLK O CLK for LCD 45 PLL DATA I/O TUNER I2C SDA 46 NC O 47 PLL CLK I/O TUNER I2C SCL 48~50 NC O 51 PANEL 5V I/O Panel 5V ON/OFF Panel DET, ACC ON : L 52, 53 NC O 54 VOL A I Rotary encoder input Refer to timing chart. 55 VOL B I Rotary encoder input Refer to timing chart. 56 DSI O 57 NC O 58 FILP-DET I 14seg collapsible DET 59 L CE O LCD driver CE 60 NC O 61~63 TYPE0~TYPE2 I Destination setting r 64 NC O 65 ST TYPE0 I For OEM r 66 ST TYPE1 I For OEM r 67~69 NC O 70~72 MODE1~MODE3 I Cassette mechanism mode DET q 73 MOTOR O Cassette mechanism main motor During motor operation : H, During motor stop : L 74 SUB+ O Cassette mechanism sub motor w 75 SUB- O Cassette mechanism sub motor w 76 R QUAL I RDS QUAL 77 R DATA I RDS DATA 78 LX-MUTE I MUTE request from CH H : MUTE ON, L : MUTE OFF 79 LX-CON O Control output to CH ON : H, OFF : L 80 LX-REQM O Request output to CH Request DET : L 81 LX-RST O Reset for CH 82 MUTE O MUTE 83 AFS O Constant switching terminal when noise DET 84 IC2 SDA I/O SDA for EVOL 85 IC2 SCL I/O SCL for EVOL 86 P-MUTE O POWER IC MUTE output terminal

EJECT KEY ILLUMI, GUIDE ILLUMI, DSI control terminal

Truth Value

Table

Processing Operation Description

ILLUMI : L, No ILLUMI : H

Normal L, 400msec or more after system reset H, then L

During FM seek and AF search : L, During reception : H

When POWER OFF : L, ALLOFF : L, TEL MUTE : L

KRC-597/597Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

87 P-STBY O POWER IC STBY output terminal When POWER IC ON : H, OFF : L 88 SVR O POWER IC SVR control terminal Momentary power dropped : H 89 ACC-DET I ACC DET ACC DET : L, ACC no DET : H 90 PCON-DET I P-CON output DET P-CON DET : L 91 NC O Output fixed to L when P-ANT no DET

92 MS MODE O Tape between-music DET

93 F/R O Tape EQ input switching

94 METAL O Tape metal ON/OFF

95 DAVSS 96~98 EN2~EN1 O Power IC control e 99 SW5V O SW5V control 100 DAVDD Reference power supply for D/A

Truth Value

Table

Processing Operation Description

During TAPE PLAY : H, During TAPE FF/REW, and other than TAPE mode : L FWD input : L, REV input : H, Other than TAPE mode : Retain value NORMAL : H, METAL : L, Other than TAPE mode : Retain value

Truth Value Table q

MODE 1 MODE 2 MODE 3 Condition

LHHEject HLHSTBY LLLREW LLHFF HLLREV Play HHLFWD play HHHPosition other than above

Truth Value Table w

SUB MOTOR + SUB MOTOR - Condition

LLStop (During Power OFF)

LHFWD (Loading direction) HLREV (Eject direction) HHStop (During Power ON)

Truth Value Table e EN1 Control

EN1 ILL

L OFF HON

EN2 Control

EN2 AUDIO 8V AM 8V FM 8V

L OFF OFF OFF

MONOFF ON

HONONOFF

EN3 Control

EN3 P-ANT P-CON

L OFF OFF

M OFF ON

HONON

✽ H=5V M=2.5 L=0V

Truth Value Table r

MODEL TYPE0 TYPE1 TYPE2 ST TYPE0 ST TYPE1 KRC-597 L H H L L KRC-597Y L H H L L

TEST MODE

KRC-597/597Y

1. How to enter the test mode

• While holding the Preset 1 and Preset 3 keys, reset the unit.

2. How to exit from the test mode

• Reset the unit, momentary power down, ACC OFF, po w er OFF, and Panel detached.

•(Note) The test mode cannot terminated by Panel is fall 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.

• BEEP : When pressing any keys, the buzzer

generates a beep at any time.

• DISPLAY TYPE: TYPE A

4. RDS automatic measurement

• An addition to disposal of substitute for visual check PS display as usual production lines.

• P-CON ter minal is OFF by force, when received the PS data and in case of corrobaration PS display is “RDS_TEST”. (“_” is mean blank.)

• This disposal is test mode only.

• P-CON is switching the source or return with power on→off.

7. Test mode specifications of the cassette receiver

•BLANK SKIPP : OFF

8. 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.

•Fader is selected to the initial item.

• Continuous holding of a remote control key is inhibited.

• Bass, Middle and Treble are adjusted in 3 steps of -8/0/+8 with the Track Up/Down keys.

• Balance is adjusted in 3 steps of L15/0/R15 with the Track Up/Down keys.

•Fader is adjusted in 3 steps of F15/0/R15 with the Track Up/Down keys.

•Volume Offset is adjusted in 2 steps of -8/0 with theTrack Up/Down keys.

9. Menu-related specifications

•A short press of the MENU key initiates the Menu mode. Except, tape source is usually press and hold 1 second to enter the menu mode and short press initiates turn over.

• Pressing the DNPP/SBF key on the remote initiates the Menu mode.

• Continuous holding of a remote control key is inhibited.

• Contrast is adjusted in 3 steps of 0/5/10 (5x7dot), 0/4/7 (14seg) with the Track Up/Down keys.

5. 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 possib le.

6. Forced switching of K3I

• Each press of the Preset 6 key in Tuner mode should switch K3I from AUT O → 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

10. 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.

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