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Kenwood KRC-279RA Service Manual

Cassette receiver
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CASSETTE RECEIVER
KRC-15RG
KRC-179RA/RG/RYA/RYG
KRC-25RA/RG
KRC-279RA/RG/RYA/RYG
KRC-281RG
SERVICE MANUAL
KRC-15RG (E)
PWR
SRC
OFF
CLK
4 0 W x
4 0 W x 4
HIGH POWER
T I
VOL ADJ
LOUD
T.CALL
1
2
3
4
5
ATT
KRC-25RA/RG (E)
PWR
SRC
OFF
CLK
4 0 W x
4 0 W x 4
HIGH POWER
CD/MD-CHANGER CONTROL
T I
VOL ADJ
NAME SET
LOUD
SCAN
RDM
REP
T.C/D.SCN
1
2
3
4
5
ATT
KRC-281RG (M)
PWR
SRC
OFF
CLK
4 0 W x
4 0 W x 4
HIGH POWER
CD/MD-CHANGER CONTROL
T I
VOL ADJ
NAME SET
LOUD
SCAN
RDM
REP
T.C/D.SCN
1
2
3
4
5
ATT
DC CORD
PLASTIC CABINET ASSY
(E30-xxxx-xx)
(A02-1486-13)
(Refer to the parts list.)
REW
FF
PR
OG
KRC-15R
PTY
FM
AM
6
AUD
MENU
REW
FF
PR
OG
KRC-25R
PTY
DISC
FM
M.RDM
6
AUD
AM
MENU
REW
FF
PR
OG
KRC-281R
PTY
DISC
FM
M.RDM
AM
6
AUD
MENU
LEVER
(D10-3031-04) x2
© 2000-10 PRINTED IN KOREA
B51-7684-00 (K) 2161
KRC-179RA/RG/RYA/RYG (E)
PWR
SRC
OFF
CLK
4 0 W x 4
4 0 W x
HIGH POWER
T I
VOL ADJ
LOUD
T.C/ALL
1
2
3
4
ATT
KRC-279RA/RG/RYA/RYG (E)
PWR
SRC
OFF
CLK
4 0 W x
4 0 W x 4
HIGH POWER
CD/MD-CHANGER CONTROL
T I
VOL ADJ
NAME SET
LOUD
SCAN
RDM
REP
T.C/D.SCN
1
2
3
4
ATT
SCREW SET
ANTENNA ADAPTOR
(T90-0523-05)
(N99-1610-15)
(Except KRC-281RG)
(KRC-281RG only)
STAY
(J54-0606-04)
(KRC-281RG only)
REW
FF
PR
OG
KRC-179R
PTY
FM
5
6
AUD
AM
MENU
REW
FF
PR
OG
KRC-279R
PTY
DISC
FM
M.RDM
AM
5
6
AUD
MENU
SCREW SET
(N99-1632-05)
(KRC-281RG only)
MOUNTING HARDWARE ASSY
(J21-9491-13)
40%

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  Summary of Contents for Kenwood KRC-279RA

  • Page 1 VOL ADJ VOL ADJ LOUD T.CALL LOUD T.C/ALL MENU MENU KRC-25RA/RG (E) KRC-279RA/RG/RYA/RYG (E) 4 0 W x 4 0 W x 4 4 0 W x 4 0 W x 4 HIGH POWER HIGH POWER KRC-25R CD/MD-CHANGER CONTROL KRC-279R...
  • Page 2: Table Of Contents

    KRC-15R,179R,25R,279R,281R CONTENTS / BLOCK DIAGRAM CONTENTS CONTENTS / BLOCK DIAGRAM .......2 PC BOARD ..............9 COMPONENT DESCRIPTION........3 SCHEMATIC DIAGRAM...........13 MICROCOMPUTER'S TERMINAL DESCRIPTION ...4 EXPLODED VIEW ............18 TEST MODE...............6 PARTS LIST .............21 ADJUSTMENT............7 SPECIFICATIONS ........Back cover PARTS DESCRIPTIONS..........8 BLOCK DIAGRAM...
  • Page 3: Component Description

    KRC-15R,179R,25R,279R,281R COMPONENT DESCRIPTION SYNTHESIZER UNIT (X14-656x-xx) REF No. FUNCTION OPERATION SYSTEM µ-COM Controls the unit. E-VOLUME Controls the volume and selects source. MUTE LOGIC Controls the mute output. POWER AMPLIFIER For the speaker output. EQUALIZER AMPLIFIER For the cassette tape's signal. RESET Resets the power.
  • Page 4: Microcomputer's Terminal Description

    KRC-15R,179R,25R,279R,281R MICROCOMPUTER'S TERMINAL DESCRIPTION (X14-) IC1 : µ-COM PORT No. PORT NAME FUNCTION OPERATING CONDITION PANEL Panel detection. "L" : Panel exists. L CE LCD driver chip enable. L RES LCD driver reset. AVSS GND. R DATA RDS data. R QUAL RDS receiving.
  • Page 5 KRC-15R,179R,25R,279R,281R MICROCOMPUTER'S TERMINAL DESCRIPTION (X14-) IC1 : µ-COM PORT No. PORT NAME FUNCTION OPERATING CONDITION FM noise detection / Time constant SW. MUTE Mute control. AMP MUTE Power amplifier mute. CH CNT Changer control. REQ H Changer request. SVR control. AMP STBY Power amplifier stand-by.
  • Page 6: Test Mode

    KRC-15R,179R,25R,279R,281R TEST MODE 1. How to enter the test mode • Reset the unit while holding the "FM" key and preset "6" key. • All indication segments go ON at the beginning of the test mode. 2. How to release the test mode •...
  • Page 7: Adjustment

    KRC-15R,179R,25R,279R,281R ADJUSTMENT Head Angle Adjustment Head height alignment procedure • During FWD transport adjust screws F and F ' so that line A of 2-LINE TAPE passes trough the center of the head shield plate (core center area) • During RVS transport adjust screws R and R ' so that line B of 2-LINE TAPE passes trough the center of the head shield plate core (center (2-LINE TAPE) area)
  • Page 8: Parts Descriptions

    KRC-15R,179R,25R,279R,281R PARTS DESCRIPTIONS...
  • Page 9: Pc Board

    PC BOARD (Component side view) SWITCH UNIT X13-964x-xx (J74-0962-32) SYNTHESIZER UNIT X14-656x-xx (J74-1189-12) W103 W158 W159 C400 R452 R453 C401 D409 D403 W101 R351 R154 D370 W102 D402 D410 W200 D371 D401 D350 D404 D400 D405 R155 R451 D152 C451 R450 W153 W170...
  • Page 10: Schematic Diagram

    PC BOARD (Foil side view) SYNTHESIZER UNIT X14-656x-xx (J74-1189-12) SWITCH UNIT X13-964x-xx (J74-0962-32) W103 W158 W159 C400 R453 R452 C401 D409 W101 D403 R351 D370 R154 W102 D402 D410 D371 W200 D401 D350 D404 D400 D405 R155 D152 R451 C451 W153 R450 W170...
  • Page 11 UN2113 KRC-179RYA/YG (E) 2-71 UPD780058GC211 P-CON : 1SS133 Q320,351 : 2SA1037K KRC-15RG (E) 2-71 UPD780058GC211 D380 MA4047-M Q450,451 : DTC143TK or KRC-279RA/G (E) 2-72 UPD780058GC211 D400,401,404,408,409 UN2216 X13- KRC-279RYA/YG (E) 2-72 UPD780058GC211 MA4062-L Q501 DTC114TK or KRC-15R,179R,25R,279R,281R KRC-25RA/G (E) 2-72...
  • Page 12 (exposed parts are acceptably KRC-25RG (E) insulated from the supply circuit) before the appliance is returned to KRC-15RG (E) : B30-1564-05 the customer. : MA3062-M KRC-279RA (E) KRC-279RYA (E) B30-1566-05 B30-1511-05 KRC-179RA (E) 2-72 GND LINE...
  • Page 13: Exploded View

    KRC-15R,179R,25R,279R,281R EXPLODED VIEW(MECHANISM) D40-1136-05 (MECHA.) KRC-15R,179R,25R,279R,281R (E,M) Parts with exploded numbers larger than 700 are not supplied.
  • Page 14 KRC-15R,179R,25R,279R,281R EXPLODED VIEW(UNIT) (X14-) (Except KRC-281R) (X14-) (X14-) (KRC-281R only) (KRC-281R only) (KRC-281R only) (X14-) KRC-25R KRC-279R (X14-) KRC-281R (X14-) only M3x4 : N30-3004-46 f3x5 : N83-3005-46 (X14-) (X14-) f3x10 : N35-3010-46 (X14-) f3x8 : N80-3008-46 f3x20 : N83-3020-46 f2.6x6 : N86-2606-46 M3x8 : N30-3008-46...
  • Page 15 KRC-15R,179R,25R,279R,281R EXPLODED VIEW(UNIT) f2x6 : N80-2006-46 f1.5 : N29-0205-04 f2x8 : N80-2008-45 (X13-) (X13-) (X13-) (X13-) (X13-) (X13-) (X13-) UNIT (2/2) KRC-15R,179R,25R,279R,281R(E,M) Parts with exploded numbers larger than 700 are not supplied.
  • Page 16: Parts List

    PANEL ASSY ITEM CARTON CASE (KRC-281RG) ✽ A64-2305-02 ✽ H54-1874-03 PANEL ASSY E8E9 ITEM CARTON CASE (KRC-279RG) ✽ H54-1875-03 ITEM CARTON CASE (KRC-279RA) ✽ A64-2306-02 PANEL ASSY ✽ H54-1876-03 ITEM CARTON CASE (KRC-279RYG) ✽ H54-1877-03 B07-2188-02 ESCUTCHEON ITEM CARTON CASE (KRC-279RYA) ✽...
  • Page 17 E & Z : Europe E : KRC-279RG E3 : KRC-279RYA E6 : KRC-179RYG E9 : KRC-25RA K : North America E1 : KRC-279RA E4 : KRC-179RG E7 : KRC-179RYA M1 : KRC-281RG M : Other Areas E2 : KRC-279RYG...
  • Page 18 E & Z : Europe E : KRC-279RG E3 : KRC-279RYA E6 : KRC-179RYG E9 : KRC-25RA K : North America E1 : KRC-279RA E4 : KRC-179RG E7 : KRC-179RYA M1 : KRC-281RG M : Other Areas E2 : KRC-279RYG...
  • Page 19 E & Z : Europe E : KRC-279RG E3 : KRC-279RYA E6 : KRC-179RYG E9 : KRC-25RA K : North America E1 : KRC-279RA E4 : KRC-179RG E7 : KRC-179RYA M1 : KRC-281RG M : Other Areas E2 : KRC-279RYG...
  • Page 20 E & Z : Europe E : KRC-279RG E3 : KRC-279RYA E6 : KRC-179RYG E9 : KRC-25RA K : North America E1 : KRC-279RA E4 : KRC-179RG E7 : KRC-179RYA M1 : KRC-281RG M : Other Areas E2 : KRC-279RYG...
  • Page 21: Specifications

    155mm Weight 1400g 1400g KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. Manufactured under license from Dolby Laboratories. KENWOOD CORPORATION "Dolby" and the double-D symbol are trademarks of Dolby 14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo, 150-8501 Japan Laboratories.