Kenwood KRC-794/Y Service Manual
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Kenwood KRC-794/Y Service Manual

Kenwood KRC-794/Y Service Manual

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CASSETTE RECEIVER
KRC-794/Y
QQ
3 7 63 1515 0
SERVICE MANUAL
The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05.
Please refer to the service manual for model D40-1122-05(B51-7542-00).
TE
L 13942296513
DC cord
(E30-4942-05)
Plastic cabinet assy
(A02-1497-13)
www
.
Panel assy
Front glass
(A64-3030-02)
(B10-4398-01)
KRC-794
50Wx4
LOUD
B NR
SCAN
B.S/RDM
Knob(VOL)
Knob(1-6)
(K25-1404-13)
(K25-1405-12)
Remote controller assy
(A70-0886-15)
MASK-key
Lever
Torsion coil spring
(D10-4562-04)x2
(G01-2924-04)
x
ao
u163
y
i
2 9
8
Knob(SRC)
Knob(FM,AM)
(K24-3835-04)
(K25-1406-03)
DOLBY B NR
PROG/PTY
EX
REP
MTL/M.RDM
TI
DISP
VOL ADJ
NAME.S
Q Q
3
6 7
1 3
1 5
Knob(UP,DW)
(K25-1408-03)
Antenna adaptor
(T90-0523-05)
Remote controller assy
(A70-2025-05)
RC-410
co
.
9 4
2 8
© 2002-12 PRINTED IN JAPAN
B53-0012-00 ( N ) 1874
Knob(PROG)
(K25-1407-03)
DAB
ANG
OFF
AUD
CLK
MENU
0 5
8
2 9
9 4
2 8
Front glass
(B10-4222-03)
Screw set
(N99-1704-05)
Mounting hardware assy
(J21-9716-03)
m
9 9
9 9

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Summary of Contents for Kenwood KRC-794/Y

  • Page 1 CASSETTE RECEIVER KRC-794/Y 3 7 63 1515 0 SERVICE MANUAL © 2002-12 PRINTED IN JAPAN B53-0012-00 ( N ) 1874 The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05. Please refer to the service manual for model D40-1122-05(B51-7542-00). Knob(SRC)
  • Page 2 3 7 6 3 1 5 1 5 0 ANT. TUNER A 8V SW5V FM+B 460mV(KTYPE) 170mV 245mV(ETYPE) AM+B B.U.5V Q1-4 IC11 MUTE 1.8V PRE OUT AUDIO BUFFER DRIVER SW5V DECODER E TYPE K TYPE E-VOL TAPE 1800mV 1800mV 388mV N.C.

  • Page 3: Components Description

    KRC-794/Y COMPONENTS DESCRIPTION 3 7 63 1515 0 SWITCH UNIT(X16-1540-12) Component Purpose Function Operation/Condition/Compatibility ¡ LCD DRIVER with Key Matrix Remote Control IC Key Detection SW Q2 starts key scan in M&T. Lights key illumination in Red when the base of Q3 is ON.

  • Page 4: Microcomputer's Terminal Description

    KRC-794/Y MICROCOMPUTER'S TERMINAL DESCRIPTION 3 7 63 1515 0 SYSTEM MICROCOMPUTER UPD703033GC138 (IC1: X14-) Pin No. Name Description Processing Operation AM+B AM power supply terminal. During AM operation: H. During FM operation: H. FM+B FM power supply terminal. Last FM with RDS model: H During FM seek or AM search: L.
  • Page 5 KRC-794/Y MICROCOMPUTER'S TERMINAL DESCRIPTION 3 7 63 1515 0 Pin No. Name Description Processing Operation SUB2 Sub-motor output terminal (2). SUB3 Sub-motor output terminal (3). Cassette mechanism/SRM mechanism Cassette mechanism: H. CAS/SRM voltage switching terminal. SRM mechanism: L. Outputs Low.
  • Page 6 KRC-794/Y MICROCOMPUTER'S TERMINAL DESCRIPTION 3 7 63 1515 0 Pin No. Name Description Processing Operation During TAPE PLAY: L. During TAPE FF/REW: H. EQ-MUTE EQ muting switching. Other than TAPE input: H. NORMAL/METAL switching. NORMAL: H. METAL: L. Back-Up detected: L BU-DET Momentary power down detection terminal.

  • Page 7: Test Mode

    KRC-794/Y TEST MODE 3 7 63 1515 0 M&T-SRT Model Test Mode 7. Audio-related specifications • A short press of the Q key initiates the audio adjustment 1. How to enter the test mode mode. • While holding the FM and Preset 6 keys, reset the unit.
  • Page 8 KRC-794/Y TEST MODE 3 7 63 1515 0 10. Special display when the display is All ON Security-related information Pressing the Preset keys while the power is All OFF • Forced Power ON mode (All models) displays the following information.
  • Page 9 KRC-794/Y TEST MODE 3 7 63 1515 0 • Method of writing the Mask key while the EEPROM is • Method of clearing all Mask key-related data in the initial status 1. Enter the test mode. (See 1 How to enter the test mode) 1.
  • Page 10 KRC-794/Y ADJUSTMENT 3 7 63 1515 0 Set the controls and switches as follows. BALANCE :center position BASS :center position LOUD :OFF DOLBY NR :OFF FADER :center position TREBLE :center position TUNER OUTPUT ALIGNMENT ITEM INPUT SETTINGS (RECEIVER) ALIGN FOR FIG.
  • Page 11 KRC-794/Y PC BOARD 3 7 63 1515 0 (COMPONENT SIDE VIEW) (FOIL SIDE VIEW) X16-1540-12 (J74-1306-12) X16-1540-12 (J74-1306-12) ILL+B ILLUM G L-DATAS CLK L- L-CE L-DATAL DIMMER DGND RESET L 13942296513 X16-1540-12 Ref. No address X87-3022-71 (J74-1148-12) u163 X87-3022-71 DOLBY Ref.

  • Page 12: Pc Board (Component Side View)

    KRC-794/Y 3 7 63 1515 0 PC BOARD (COMPONENT SIDE VIEW) L 13942296513 u163 X14-6442-73 Ref. No address Ref. No address Ref. No address Ref. No address Ref. No address IC11 IC13 Refer to the schematic diagram for the values of resistors and capacitors.
  • Page 13 KRC-794/Y PC BOARD (FOIL SIDE VIEW) 3 7 63 1515 0 W106 C172 R198 R199 R376 R361 R346 R345 R332 R191 R372 R307 C304 R375 R373 R371 R352 C303 L 13942296513 C251 R341 C301 R366 R337 C302 R288 R217 C108...
  • Page 14 2SA1576A 2SB1277 BLU/WHT 2SB1218A TEL MUTE 2SB1443 ORG/WHT 2SB709A 2SC2412K TC74HC02AF 2SA1037K 2SC4081 2SB1188 M5237ML DC CORD (E30-4942-05) : KRC-794/Y DTA114EUA 2SB1184 DTC144EUA TDA7479D KRC104S L 13942296513 (X87-3022-71) (X87-3022-71) IC1 : CXA2560Q EQ AMP Q1 : DTC124EK or 0.01 KRC103S...
  • Page 15 KRC-794/Y 3 7 63 1515 0 DC IN F1 10A J3 TOP VIEW 1.45V 14.4V 7.5V 0V-4.1V 7.5V 1.25V REQ H D GND 3300u16 CH CON POWER IC 7.5V 8.9V 1.37V 1.37V MUTE 7.5V A GND 2200P 7.5V 7.5V 7.5V 14.4V...
  • Page 16 KRC-794/Y 3 7 63 1515 0 PRE OUT FRONT REAR R307 C307 2.2M 0.01 R24 22K R23 22K R38 22K R37 22K R315 4.7K MUTE MUTE 4.4V 4.7K 4.7K 4.7K 4.7K CH MUTE MC D CH CON SC D C252 CH REQH 47u6.3...
  • Page 17 2-73 u163 KRC-794/Y (1/2) CAUTION : For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list). Indicates safety critical components. To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
  • Page 18 KRC-794/Y 3 7 63 1515 0 (X16-1540-12) S.GND 10.7V ILL+B +10.7V +10.7V ILLUM G KEY SCAN L CLK L CE X16- RESET L DATAS L DATAL DIMMER REMO GND2 5.0V GND1 D GND L 13942296513 REMOTE REMO SENSOR IC GREEN REMO 5.0V...
  • Page 19 MA3082-M KRA302 GND LINE Q3-5 : 2SC4081 DTC143ZK B LINE +10.7V GREEN LED SW +10.7V RED LED SW DIMMER SW L 13942296513 +10.7V C11 0.01 C12 0.01 4.7K C13 0.01 VOL+ OPEN DISP VOL- EJECT u163 KRC-794/Y (2/2) X16-1540-12 (2/2)

  • Page 20: Exploded View (Mechanism)

    KRC-794/Y EXPLODED VIEW (MECHANISM) 3 7 63 1515 0 L 13942296513 u163 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 21: Exploded View (Unit)

    KRC-794/Y EXPLODED VIEW (UNIT) 3 7 63 1515 0 FPC1 CME1 (X87-) L 13942296513 (X14) (X16-118) PME1 (X16-118) FPC2 (X14-) (X16-154) u163 (X16) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 22: Parts List

    KRC-794/Y PARTS LIST 3 7 63 1515 0 ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. Dest Dest Ref. No.
  • Page 23 KRC-794/Y PARTS LIST 3 7 63 1515 0 ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SYNTHESIZER UNIT (X14-6442-73) Teile ohne Parts No. werden nicht geliefert.
  • Page 24 KRC-794/Y PARTS LIST 3 7 63 1515 0 ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SYNTHESIZER UNIT (X14-6442-73) Teile ohne Parts No. werden nicht geliefert.
  • Page 25 KRC-794/Y PARTS LIST 3 7 63 1515 0 ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SYNTHESIZER UNIT (X14-6442-73) Teile ohne Parts No. werden nicht geliefert.
  • Page 26 KRC-794/Y PARTS LIST 3 7 63 1515 0 ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SWITCH UNIT (X16-1540-12) Teile ohne Parts No. werden nicht geliefert.
  • Page 27 KRC-794/Y PARTS LIST 3 7 63 1515 0 CAPACITORS 2 2 0 • Capacitor value CC45 Color* 010 = 1pF 0 = 22pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating 100 = 10pF 2 = Shape ... round, square, etc.

  • Page 28: Specifications

    Preout level / Load (during disc play) ..1800mV / 10kΩ Preout impedance ..........≤600Ω KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. US and foreign patents licensed from Dolby Laboratories Licensing Corporation.

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