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Kenwood KRC-225, Service Manual

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Kenwood KRC-225 Service Manual Download Page 3

KRC-225/235/265/265S

3

COMPONENT DESCRIPTION

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

IC1

LC72366-9592

System MI-COM.

System control

IC2

TDA7461ND

E-VOL. & N.C. MPX

Controls sound volume. Selects each source.

IC3

HD74HC27FP

Mute logic

3-input NOR gate x 3

IC4

TDA7384A or

Power IC

Amplifies power so that the speaker can drive audio signal.

TDA7386

IC5

LA3161

Equalizer amplifier

Equalizer amplifier for cassette tape sound

2SC2412K or

BACK-UP detection

While BACK-UP is added, a base becomes Hi, and Q50 is

Q50

2SD601A

(Momentary power down

turned on.

detection) SW

Q51

2SB1443

While BACK-UP is added, AVR o5V.

Q52

2SC2412K or

BACK-UP 5V AVR

Q51 and Q52 is inverted Darlington connection.

2SD601A

Q53

DTA114YK or UN2114

P.ON 5V SW

While a base becomes Lo, Q53 is turned on.

or KRA107S

Q54

DTC144EK or UN2213

While Q54's base becomes Hi, Q55 is turned on.

or KRC104S

COM+B SW

Q55

DTA124EK or UN2112

Works during POWER ON mode.

or KRA103S

2SA2057 or 2SB1548

Q56

(P) or 2SB1565(E,F)

While Q57's base becomes Hi, Q56 is turned on.

or 2SB1655(E,F)

COM+B AVR

Q57

2SC2412K or

Q56 and Q57 is inverted Darlington connection.

2SD601A

Q58

DTC144EK or UN2213

While Q58's base becomes Hi, Q59 is turned on.

or KRC104S

IllumiB SW

Q59

DTA124EK or UN2112

Works during POWER ON mode with a panel attached

or KRA103S

to the set.

2SA2057 or 2SB1548

Q60

(P) or 2SB1565(E,F)

While Q61's base becomes Hi, Q60 is turned on.

or 2SB1655(E,F)

IllumiB driver

Q61

2SC2412K or

Q60 and Q61 is inverted Darlington connection.

2SD601A

DTC124EK or UN2212

When BACK-UP detection SW or CHANGER RESET SW or

Q150

or KRC103S

Electric volume mute SW

MI-COM.'s mute works, a base becomes Hi, and Q150
is turned on.

Q151

DTC114YK or UN2214 

SVR discharge SW

When POWER IC RESET is activated, a base becomes Hi,

or KRC107S

Q151 is turned on.

DTA124EK or UN2112

When BACK-UP detection SW or CHANGER RESET SW or

Q153

or KRA103S

Pre-out mute driver

MI-COM.'s mute works, a base becomes Lo, and Q153
is turned on.

Q200

DTC124EK or UN2212

Q201 is turned on when Q200's base becomes Hi.

or KRC103S

FM +B SW

Q201

2SB1277(Q,R)

Works during FM reception mode.

Q202

DTC124EK or UN2212

Q203 is turned on when Q202's base becomes Hi.

or KRC103S

AM +B SW

Q203

2SB1277(Q,R)

Works during AM reception mode.

SWITCH UNIT(X16-1490-XX)

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

IC1

LC75853NE

LCD driver with key-matrix

Q1

DTA114EK or UN2111

Key-matrix permission SW Ready on key-matrix

or KRA102S

SYNTHESIZER UNIT(X14-6850-XX)

Summary of Contents for KRC-225

Page 1: ...abinet assy A02 1486 13 Lever D10 3031 04 x2 Mounting hardware assy J21 9491 13 DC cord E30 4783 05 KRC 225 235 DC cord E30 4784 05 KRC 265 S Screw set N99 1610 15 Screw set N99 1719 05 Escutcheon B07 2124 02 Panel assy A64 2506 02 Escutcheon B07 2124 02 Panel assy A64 2507 02 KRC 265 A64 2634 02 KRC 265S Escutcheon B07 2124 02 KRC 265 B07 3049 02 KRC 265S ...

Page 2: ...UT SDA SCL DIG GND IF1 B IF1 GND S METER IF2 GND SD FM B SW5V ACC DET B U DET SCL MUTE SDA P CON PANEL HOLD L CLK L DATA S L DATA L FWD REV MOTOR CH CON DATA H DATA C REQ H REQ C CH CLK Rch COM Lch TAPE MP IN AM MPX OUT RR OUT LR OUT RF Rch LEVEL SCL SDA OUT LF Rch STBY MUTE Rch Lch T MUTE FWD REV B U 5V B U 8V B U CHRST S MUTE 8 4 6 5 B U 5V AM B VDD 5V PACK IN L CE ANT CON CHMUTE BEEP SVR AMP ST...

Page 3: ...44EK or UN2213 While Q58 s base becomes Hi Q59 is turned on or KRC104S Illumination B SW Q59 DTA124EK or UN2112 Works during POWER ON mode with a panel attached or KRA103S to the set 2SA2057 or 2SB1548 Q60 P or 2SB1565 E F While Q61 s base becomes Hi Q60 is turned on or 2SB1655 E F Illumination B driver Q61 2SC2412K or Q60 and Q61 is inverted Darlington connection 2SD601A DTC124EK or UN2212 When B...

Page 4: ...0 is turned on Q351 2SA1037K P CON protection SW Works when P CON is being short circuited on GND Q352 DTA124EK or UN2112 P CON protection Inhibits protection SW function when P CON works momentary or KRA103S inhibit SW Q353 DTC114YK or UN2214 P CON SW Q353 is turned on when a base becomes Hi Works during or KRC107S POWER ON mode Q370 2SB1277 Q R Q370 is turned on when Q371 s base becomes Hi Q371 ...

Page 5: ... B U 5V lines 32 REQ C I Request input from changers Lo Request 33 MUTE O Audio mute on off output Hi Mute ON 34 CH CON O Changer control Lo Standby Hi ON 35 REQ H O Request output to changers Lo Request When the momentary power down after ACC 36 SVR O Power IC reset terminal ON OFF is detected and after POWER OFF the output becomes Hi temporarily 37 AMP STBY O Power IC standby control output Hi P...

Page 6: ...onnected to GND lines 66 GND I Connected to GND lines 67 HOLD I MI COM HOLD input Lo Hold 68 VDD VDD connection terminal Connected to B U 5V lines 69 GND I Connected to GND lines 70 GND I Connected to GND lines 71 72 O N C Not used 73 VDD Positive power supply connection terminal Connected to B U 5V lines 74 GND I Connected to GND lines 75 GND I Connected to GND lines 76 VSS Ground connection term...

Page 7: ... NOTE The test mode is not canceled by ACC OFF power OFF momentary power down or the panel off 3 Audio adjustment Set the volume level to 10dB which is shown as 30 on the display Loudness OFF The BASS TREBLE and BALANCE FADER con trols can be set to the full boost full cut and full right full left and full front full rear respectively by press ing the Track Up Track Down keys Sound coordination do...

Page 8: ...ses through the center of the head shield plate core center area 3 After the alignment above reverse the transport direction and check the FWD alignment again If it is deviated perform alignment again Tape used SCC 1659 manufactured by A BEX 2 HEAD AZIMUTH TCC 153 10kHz Connect an AC voltmeter and oscilloscope to SP outputs TAPE PLAY Head Azimuth Screw Adjust the azimuth for each L ch R ch or FWD ...

Page 9: ...D150 D152 P1 WH1 D100 CN2 D261 X14 6850 xx W122 R58 R155 R15 W112 R14 R62 W113 R152 R129 R59 W133 W119 R413 C202 R16 R13 W111 W121 R372 R151 C101 C600 R324 C163 R161 W135 R102 R118 R119 R115 R114 R126 R52 R54 R105 R106 R103 R207 R206 C164 R352 R320 C155 C154 C157 C156 C153 C151 C506 R127 R154 R150 R153 R322 R401 R400 R408 R409 R407 R406 R412 R410 R411 R303 R304 R306 R305 R403 R301 R402 R321 W129 C...

Page 10: ...Foil side view AM FM AUD PL1 RST 6 5 4 3 2 1 PL2 ATT CLIK AUTO SRC 1 29 D2 D1 D4 D3 D5 D6 D7 D8 D9 D10 D11 D12 D14 D15 D13 X16 1490 xx J74 1298 02 R13 R14 R18 R8 R11 R12 R19 C4 C2 C1 C5 R3 R4 R2 R1 R21 R20 R5 R6 C6 64 49 48 12 33 16 1 17 32 11 1 2 E B Q1 IC1 D17 J1 X16 1490 xx J74 1298 02 X16 1490 xx Ref No Address IC1 3N Q1 4N ...

Page 11: ...114YK or MA4062 L D400 401 404 408 409 ILLUMINATION B SW ILLUMINATION B DRIVER B SW MOTOR P CON SW RESET CHANGER SW B B LINE GND LINE SIGNAL LINE BU BU BU BU BU BU BU BU BU B B B P5V 5V 5V P5V 5V 5V P5V 13 4 3 12 8 7 11 2 1 6 10 5 9 16 15 14 8 7 6 FL RL FL RL FR RR 19 23 17 21 3 7 R412 100 R410 4 7K R409 4 7K R402 10 R411 100 R406 4 7K R407 4 7K R408 1K R403 100 7 6 5 35 34 1 12 32 11 10 0 47u50 C...

Page 12: ...ND LAMP B ESD GND R322 2 2K R301 1K R303 1K R305 1K R304 1K 27K 47K R320 R321 R324 100u16 C57 R62 100u10 C58 1K R64 1K R63 R65 2 2 1 2W R66 2 2 1 2W 4 7K 2 7K R207 R206 3 4 25 23 36 32 34 35 37 38 5 4 6 3 67 62 40 C56 100u6 3 10u10 R58 22K 100 R59 C55 C54 0 01 100u16 39 3 7 5 9 44 GND 7 R160 47K 6 5 4 3 C164 0 01 2 1 9 8 11 10 12 13 VDD 14 0 022 3 C7 120K R7 100u10 100 100P C5 C9 R5 6 8K R3 L IN 8...

Page 13: ... IC1 LC75853NE J3 X14 1 2 AUTO VOL T UP 4 3 T DOWN SRC ED1 COMMON RST D1 D4 D6 D5 D8 D7 D9 D11 D12 D13 D14 D15 D10 D2 D3 D17 D14 ED1 KEY MATRIX PERMISSION SW LCD DRIVER WITH KEY MATRIX 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 S16 S15 S14 S13 S12 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 S20 S19 S18 S17 COM1 COM2 COM3 CO3 CO2 CO1 ED1 SE...

Page 14: ... supplied 31 54 4 99 101 115 53 111 102 102 12 103 111 31 33 14 102 114 52 39 10 40 34 58 57 39 9 35 112 113 7 6 26 25 HD1 56 100 106x2 37 36 38 CM1 20 5 1 23 22 105x2 113 112 16 18 17 19 102 104 1 2 3 A B EXPLODED VIEW MECHANISM KRC 225 235 265 265S 17 ...

Page 15: ...6 2606 46 N30 3008 46 A B C D E F G B B B B X14 Ax2 Ax2 G G Refer to the following page CME1 A1 F1 244 216 DC1 242 202 200 262 726 767 261 221x2 X14 J1 X14 X14 J5 X14 J4 X14 778 X14 776 X14 777 X14 Q60 X14 Q56 X14 779 X14 IC4 X14 J2 X14 J3 X14 L1 729 701 B B E D Cx2 Fx2 Depends on the modle Refer to the parts list 1 2 3 C D EXPLODED VIEW UNIT KRC 225 235 265 265S 18 ...

Page 16: ...lied H K J H φ2x6 φ1 5 φ2x8 BLK N80 2006 46 N29 0205 04 N80 2008 45 H J K Kx2 Kx2 204 233 223 224 234 222 705 766 X16 X16 X16 272 X16 273 X16 274 X16 ED1 X16 271 775 CL1 235 PA1 252 253 255 232 232 232 254 231 258 710 251 241 227 206 256 260 257 260 259 1 2 3 E F EXPLODED VIEW UNIT ...

Page 17: ...04CW1C101M ELECTRO 100UF 16WV DC1 1C E30 4783 05 DC CORD KK1 DC2 1C E30 4784 05 DC CORD M1M5 C58 CE04CW1A101M ELECTRO 100UF 10WV C101 CK73GB1H103K CHIP C 0 010UF K F1 2D F52 0006 05 FUSE MINI BLADE TYPE 10A C102 103 CC73GCH1H220J CHIP C 22PF J F1 2D F52 0011 05 FUSE MINI BLADE TYPE 10A C150 CE04CW1A470M ELECTRO 47UF 10WV C151 CK73GB1H103K CHIP C 0 010UF K 231 1F G01 2525 04 TORSION COIL SPRING 232...

Page 18: ...RK73FB2B100J CHIP R 10 J 1 8W R13 RK73EB2E472J CHIP R 4 7K J 1 4W R251 RK73GB2A103J CHIP R 10K J 1 10W R260 RD14DB2H102J SMALL RD 1 0K J 1 2W R14 15 RK73GB2A472J CHIP R 4 7K J 1 10W R261 RD14BB2C103J RD 10K J 1 6W R16 RK73EB2E472J CHIP R 4 7K J 1 4W R50 RD14DB2H332J SMALL RD 3 3K J 1 2W R301 RK73EB2E102J CHIP R 1 0K J 1 4W R52 RK73FB2B333J CHIP R 33K J 1 8W R303 306 RK73EB2E102J CHIP R 1 0K J 1 4W...

Page 19: ...DIODE D55 MA4091 N L ZENER DIODE Q60 2D 2SA2057 TRANSISTOR Q60 2D 2SB1548 P TRANSISTOR D56 MA4110 L ZENER DIODE Q60 2D 2SB1565 E F TRANSISTOR D100 1SS133 DIODE Q60 2D 2SB1655 E F TRANSISTOR D150 152 1SS133 DIODE Q61 2SC2412K TRANSISTOR D200 MA4051 N M ZENER DIODE D260 261 AM01Z DIODE Q61 2SD601A TRANSISTOR Q150 DTC124EK DIGITAL TRANSISTOR D260 261 DSM1SD2 DIODE Q150 KRC103S DIGITAL TRANSISTOR D260...

Page 20: ... B30 1566 05 LED 1608 RED M5 37 1A D14 0682 08 ROLLER ED1 2E B38 1022 05 LIQUID CRYSTAL K1 38 1A D10 4101 08 LEVER ED1 2E B38 1068 05 LIQUID CRYSTAL KM1 39 2A G01 2830 08 COMPRESSION COIL SPRING ED1 2E B38 1094 05 LIQUID CRYSTAL M5 40 2A D10 4102 08 ARM PL1 2 B30 1483 05 LAMP 5 5V 0 125A M5 52 2A D13 1110 08 GEAR PL1 2 B30 1485 05 LAMP 5 5V 0 125A KM1 53 2B D15 0909 08 PULLEY PL1 2 B30 1513 05 LAM...

Page 21: ...35 K KRC 265 M KRC 265S M TDF TDF TDF TDF Tuner type CR2 CR2 CR2 CR2 FM Frequency Range 87 5MHz 108 0MHz 87 5MHz 108 0MHz 87 5MHz 108 0MHz 87 5MHz 108 0MHz Frequency Step 200kHz 200kHz 50kHz 50kHz Frequency Range 87 9MHz 107 9MHz 87 9MHz 107 9MHz Frequency Step 200kHz 200kHz Channel Space Selection 50k 200kHz 50k 200kHz 50k 200kHz 50k 200kHz Usable Sensitivity 9 3dBf 9 3dBf 9 3dBf 9 3dBf S N 30dB ...

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