Kenwood KRC-791/Y Service Manual

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CASSETTE RECEIVER

KRC-791/Y

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).

Panel assy

(A64-2577-02)

Knob(VOL)

(K25-1404-03)

DC cord

(E30-4942-05)

Plastic cabinet assy

(A02-1497-13)

Front glass

(B10-4156-01)

KRC-791

50Wx4

LOUD

B NR

SCAN

B.S/RDM

REP

Knob(1-6)

(K25-1405-02)

Remote controller assy

(A70-0886-15)

MASK-key

Lever

orsion coil spring

(D10-4562-04)x2

(G01-2924-04)

2001-11 PRINTED IN JAPAN

B51-7859-00 (S) 1929

Knob(SRC)

Knob(FM,AM)

(K24-3835-04)

(K25-1406-03)

DOLBY B NR

PROG/PTY

OFF

MTL/M.RDM

DISP

VOL ADJ

NAME.S

Knob(UP,DW)

(K25-1408-03)

Antenna adaptor

(T90-0523-05)

Remote controller assy

(A70-2025-05)

Knob(PROG)

(K25-1407-03)

DAB

ANG

AUD

CLK

Front glass

(B10-4222-03)

Screw set

(N99-1704-05)

Mounting hardware assy

(J21-9716-03)

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Summary of Contents for Kenwood KRC-791/Y

Page 1 CASSETTE RECEIVER KRC-791/Y SERVICE MANUAL © 2001-11 PRINTED IN JAPAN B51-7859-00 (S) 1929 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) Knob(PROG) Panel assy Front glass Knob(FM,AM) (K24-3835-04)
Page 2 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. TAPE 1372mV 1800mV 1200mV 855mV 600mV CHANGER 3600mV 3600mV S METER IC10...
Page 3: Component Description
KRC-791/Y COMPONENT DESCRIPTION SWITCH UNIT(X16-154X-XX) (X16-189X-XX) Component Purpose • Function Operation • Conditions • 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-791/Y MICROCOMPUTER'S TERMINAL DESCRIPTION UPD703033GC138 (IC1: X14-) SYSTEM MICROCOMPUTER Name Purpose Operation Description 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-791/Y MICROCOMPUTER'S TERMINAL DESCRIPTION Name Purpose Operation Description 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. No connection. Outputs Low. No connection. ILL-ON FL +B output terminal.
Page 6 KRC-791/Y MICROCOMPUTER'S TERMINAL DESCRIPTION Name Purpose Operation Description NORMAL/METAL switching. NORMAL: H. METAL: L. Back-Up detected: L BU-DET Momentary power down detection terminal. Back-Up not detected (momentary power down): H. CH-DATAC DATA input terminal from CH. CH-DATAH DATA output terminal to CH.
Page 7: Test Mode
KRC-791/Y TEST MODE M&T-SRT Model Test Mode 1. How to enter the test mode 7. Audio-related specifications • While holding the FM and Preset 6 keys, reset the unit. • A short press of the Q key initiates the audio adjustment mode.
Page 8 KRC-791/Y TEST MODE 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. Even when the security (Mask key) is approved, reset-...
Page 9 KRC-791/Y TEST MODE • Method of writing the Mask key while the EEPROM is in the initial status 1. Enter the test mode. (See 1 How to enter the test mode) 2. Press the CLK key to enter the Mask key registration mode.
Page 10: Cassette Deck Section
KRC-791/Y ADJUSTMENT 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. SETTINGS POINTS SETTINGS CASSETTE DECK SECTION...
Page 11: Pc Board (Component Side View)
PC BOARD (Component Side View) SWITCH UNIT SYNTHESIZER UNIT X14-6442-70 (J74-1140-12/J74-1397-02) X16-1540-10 (J74-1306-12) SWITCH UNIT SYNTHESIZER UNIT (X16-154X-XX) (X14-6442-7X) R136 PMUTE R134 R131 STBY C112 C131 C132 C154 R107 R100 C111 C135 C169 R162 R161 C157 C136 C137 SW5V IC2C R108 R114 R123...
Page 12 PC BOARD (Foil Side View) SYNTHESIZER UNIT SWITCH UNIT X16-1540-10 (J74-1306-12) SWITCH UNIT SYNTHESIZER UNIT X14-6442-70 (J74-1140-12/J74-1397-02) (X16-154X-XX) (X14-6442-7X) ILL+B ILLUM G L-DATAS CLK L- L-CE L-DATAL C173 DIMMER DGND RESET R167 R315 R168 W103 R135 R112 IC10 R313 R106 IC15 R289 R306...
Page 13 PC BOARD Component Side View DOLBY UNIT X87-3022-71 (J74-1148-12) DOLBY L DOLBY R DOLBY Foil Side View DOLBY UNIT X87-3022-71(J74-1148-12) Refer to the schematic diagram for the values of resistors and capacitors.
Page 14 WHT/BLK GRN/BLK GRY/BLK VIOL/BLK VIOL BLU/WHT PNK/BLK EXT. CONT. ANT. CON BLU/WHT TEL MUTE ORG/WHT DC CORD (E30-4942) : KRC-791Y (E30-4956) : KRC-V791/791 (X87-3022-7X) (X87-3022-7X) (X87-3022-7X) IC1 : CXA2560Q MODEL UNIT NAME EQ AMP Q1 : DTC124EK or 0.01 KRC-791Y 2-71 KRC103S KRC-V791...
Page 15 PRE OUT FRONT REAR DC IN (X14-6442-7X) F1 10A J3 TOP VIEW 1.45V CH CN 14.4V 7.5V 0V-4.1V 7.5V 1.25V REQ H D GND R24 22K R23 22K R38 22K R37 22K 3300u16 CH CON POWER IC MUTE 7.5V 8.9V 1.37V 1.37V 7.5V...
Page 16 ILL GND ILL GND ILL +B ILL +B S.GND ILL +B ILL +B C191 R194 C190 0.01 10u16 R193 100K (X14-6442-7X) SIGNAL LINE UNIT R323, MODEL NAME R324 R367 B LINE KRC-791 (E) 2-72 KRC-791Y (E2) 2-73 KRC-V791 (E2) 2-74 KRC-791/Y...
Page 17 C13 0.01 C11 0.01 C12 0.01 5.0V 5.0V S.GND VLCD 8.5V VLCD0 6.8V VOL+ C4 0.1 OPEN DISP VLCD1 5.1V C3 0.1 LCD DRIVER VLCD2 3.4V C2 0.1 VLCD3 1.7V VOL- VLCD4 C1 680P TEST R1 43K 5.0V EJECT KRC-791/Y...
Page 18: Exploded View (Mechanism)
KRC-791/Y KRC-791/Y EXPLODED VIEW (MECHANISM) EXPLODED VIEW (UNIT) FPC1 (X87-) (X14) (X16) (X16) FPC2 (X14-) (X16-) (X16) Parts with exploded numbers larger than 700 are not suppied. Parts with exploded numbers larger than 700 are not suppied.
Page 19: Parts List
KRC-791/Y PARTS LIST ∗ New Parts The language of an instruction manual. E : ENG F : FRE P : POR H : HUN O : POL Parts without Parts No. are not supplied. G : GER D : DUT...
Page 20 KRC-791/Y PARTS LIST ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SYNTHESIZER UNIT (X14-6442-7X) Teile ohane Parts No. werden nicht geliefert. Dest Dest Ref.No. Parts No.
Page 21 KRC-791/Y PARTS LIST ∗ New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SYNTHESIZER UNIT (X14-6442-7X) Teile ohane Parts No. werden nicht geliefert. Dest Dest Ref.No. Parts No.
Page 22 KRC-791/Y PARTS LIST SYNTHESIZER UNIT (X14-6442-7X) ∗ New Parts SUB CIRCUIT UNIT (X16-118X-XX) Parts without Parts No. are not supplied. SWITCH UNIT (X16-154X-XX) Les articles non mentionnes dans le Parts No. ne sont pas fournis. DOLBY UNIT (X87-3022-7X) Teile ohane Parts No. werden nicht geliefert.
Page 23 KRC-791/Y PARTS LIST ∗ New Parts Parts without Parts No. are not supplied. DOLBY UNIT (X87-3022-7X) Les articles non mentionnes dans le Parts No. ne sont pas fournis. CASSETTE MECHANISM ASSY (D40-1146-05) Teile ohane Parts No. werden nicht geliefert. Dest Dest Ref.No.
Page 24: Specifications
(H) ....... 53 mm (D) ....... 155 mm Weight ........... 1.4 kg 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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