Kenwood RXD-790 Service Manual
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Kenwood RXD-790 Service Manual

Kenwood RXD-790 Service Manual

Mini hifi component system
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Table of Contents

MINI HiFi COMPONENT SYSTEM
RXD-790/V860/V890
SERVICE MANUAL
(XD-790/V860/V890)
Knob*
(K29-)
Knob
(K29-6759-12)
0
PUSH
OPEN
Front glass
(B10-2282-12)
Cassette lid
(A53-2019-12)
Knob
(K29-6866-02)
Lighting board
(B19-1563-13)
Knob
(K29-6865-02)
In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.
Front glass
(B10-2391-02)
MINI HiFi COMPONENT SYSTEM
ON/STANDBY
RESET
∞
EX.BASS
PRO LOGIC
MIC1
MIC2
DISPLAY BEST HITS
MIN.
MAX.
BAND
MIC MIX.
DEMO
AUTO POWER
SAVE
REV. MODE
DOLBY NR
REC/ARM
DUBBING
O.T.E.
1
DISC SELECTOR
TIME DISP.
4
1
2
3
DISC
DISC
DISC
© 1997-9/B51-5357-00 (K/K) 1586
Knob
Panel
(K29-6864-03)
(A60-1245-11)
ROCK
M/R
3 STEREO
STEREO SRS 3D
MODE
DOLBY
TUNING
AUTO
ENTER
INPUT
2
7
3
¡
A/B
OPEN/CLOSE
7
6
¢
DISC
SKIP
KENWOOD-Corp. certifies this equipment conforms to DHHS Reg-
ulations No. 21 CFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM.
Knob
POP
(K29-6863-03)
MULTI CONTROL
/VOLUME
Knob
(K29-6861-04)
PHONES
Phone jack
(E11-0280-05)
Knob
(K29-6832-13)
0
PUSH
OPEN
Front glass
(B10-2283-12)
Cassette lid
(A53-2020-12)
Knob
(K29-6832-13)
Knob
0
(K29-6865-02)
Knob
(K29-6832-13)
Illustration is RXD-790.
* Refer to parts list on page 62.

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Summary of Contents for Kenwood RXD-790

  • Page 1 * Refer to parts list on page 62. In compliance with Federal Regulations, following are reproduc- KENWOOD-Corp. certifies this equipment conforms to DHHS Reg- tions of labels on, or inside the product relating to laser product ulations No. 21 CFR 1040. 10, Chapter 1, Subchapter J.

  • Page 2: Table Of Contents

    Speaker cords ....(2) (E30-5120-08) Batteries (R6/AA) ....(2) AC plug adapter....(1) (E03-0115-05) Remote control unit ..(1) Speaker stabilizer ....(8) (A70-1160-05) : RXD-790 ..RC-790 (G11-2345-04) (A70-1161-05) : RXD-V860..RC-V860 (A70-1162-05) : RXD-V890..RC-V890 Battery cover (A09-0380-08) Remocon configuration System configuration PART NAME...

  • Page 3: External View

    Lock terminal board * FRONT SPEAKERS (E63-0200-05) (6-16Ω) (E70-0057-05) SUPER WOOFER OUTPUT INPUT PRE OUT Power cord bushing (J42-0083-05) AC power cord * (E30-) AC110- AC220- 120V 240V Slide switch (S62-0001-05) Illustration is RXD-790. * Refer to parts list on page 62.

  • Page 4: Disassembly For Repair

    RXD-790/V860/V890 DISASSEMBLY FOR REPAIR Remove main PCB's, then connect between PCB GND and chassis with alligator clip. 1. How to remove the main PCB. (1) Remove the 4 screws 1. (2) Remove the 9 screws 2. (3) Lay the rear panel with left side downward on the small box 2.

  • Page 5: Block Diagram

    -12V ROTARY DRIVER Q60,63 NJU3713D LOADING DRIVER D25,26 SW1-SW5 POWER SUPPLY RXD-790 (X32) : Refer on page5 (X32) of RXD-500/700 servi manual (B51-5300-05) RXD-790/V860/V890 RXD-V860 (X092) : Refer on page5 (X09) of RXD-500/700 servi manual (B51-5300-05) (X08) : Except RXD-V860...

  • Page 6: Circuit Description

    RXD-790/V860/V890 CIRCUIT DESCRIPTION 1. Initialization 1-1 Setting of initial conditions While pressing the [ENTER] key, plug the AC cord into the AC power outlet. 1-2 Initializing operation • A microcomputer is initialized for start when the AC power is turned on while pressing the [ENTER] key. At that time, CD mechanism are also initialized.
  • Page 7 RXD-790/V860/V890 CIRCUIT DESCRIPTION 2. KEY MATRIX No. of : Port No. of (X14)IC1 u-COM. KEY1 B PACK B PLAY STEREO F REC KEY2 A PACK A PLAY R REC KEY3 POWER A/B/BEATC INPUT KEY4 EQ. OFF MANU/REF CLASSIC ROCK KEY5...
  • Page 8 CD 4 CENTER LEVEL DOWN TAPE ¡ REAR LEVEL UP TAPE 1 REAR LEVEL DOWN 6. Main microprocessor M38198MCA-807FP (X14: IC1) : RXD-790 M38199MF-069FP (X14: IC1) : RXD-V860/V890 6-1 Microprocessor periphery block diagram (X14) IC1 (X14) ED1 (X14) IC5 RECEIVER SECTION...
  • Page 9 RXD-790/V860/V890 CIRCUIT DESCRIPTION 6-2 Pin description Pin No. Name Description BP-IN Speana input (A/D convertor input) Rotary encoder input B Rotary encoder input A A-PH A photo sensor input B-PH B photo sensor input HEAD PHONE Head phone sw input...
  • Page 10 RXD-790/V860/V890 CIRCUIT DESCRIPTION 7. Expander IC 7-1 Expander port connection EX ST IC DATA IC CLK SEL ST DOLBY ST (X14) IC5 EMPHASICE DAC ST SANYOU CE ECHO A (X05) IC2 ECHO B POWER SRS LED LW/SW 3ST LED PLL IC...
  • Page 11 RXD-790/V860/V890 CIRCUIT DESCRIPTION 7-2 Expander IC port description 7-2-1 Display section NJU7314(X14 : IC5) Pin No. Name Description SRS_LED SRS LED H=ON L=OFF 3ST_LED 3STEREO LED H=ON L=OFF PRO_LED PRO LOGIC LED H=ON L=OFF H.TAP HIGH TAP control H=ON L=OFF...
  • Page 12 DECK non music (black) cletect H=MUSIC L=NON MUSIC PAL/NTSC VCD board visual mode H=PAL L=NTSC PSSW CDM-27 MECHA position sw H=OFF L=ON STSW CDM-27 MECHA stop sw H=OFF L=ON CD section (RXD-790) : refer to RXD-500/700 service manual (B51-5300-00) on page11.

  • Page 13: Adjustment

    RXD-790/V860/V890 ADJUSTMENT 1. Tuner adjustment INPUT OUTPUT TUNER ALIGNMENT ITEM ALIGN FOR FIG. SETTINGS SETTINGS SETTINGS POINTS 98 MHz, DISTORTION AUTO Minimum 60dBµ (ANT INPUT) IFT (A1) (STEREO) 98.0 MHz distortion. 1 kHz, ±67.5 kHz DEV PILOT: ±7.5 kHz DEV...
  • Page 14 RXD-790/V860/V890 ADJUSTMENT 2. Test mode of CD player 2-2 Main unit (X32) 2-1 Mechanism (1)Setting of the test mode (1) Setting of the test mode While pressing the [TIME DISP] key, plug the AC While pressing the [PLAY/PAUSE] key, plug the AC power cord in AC outlet.
  • Page 15 RXD-790/V860/V890 ADJUSTMENT 3. Adjustment of CD player INPUT OUTPUT PLAYER ALIGNMENT ITEM ALIGN FOR FIG. SETTING SETTING SETTING POINT Step 1~4 are in TEST MODE TEST MODE : While pressing the (TIME DISP.) key, plug the AC power cord into the AC outlet.
  • Page 16 RXD-790/V860/V890 ADJUSTMENT 4. Cassette Deck adjustment DECK INPUT OUTPUT ALIGNMENT ITEM ALIGN FOR FIG. SETTING SETTING SETTING POINT Unless otherwise specified, set the respective switches as follows: 0dBs=0.775V TAPE : NORMAL DOLBY : OFF PLAY OUT : Lch (X28,CN6 4pin), Rch (X28,CN6 1pin) ø...

  • Page 17: Wiring Diagram

    RXD-790/V860/V890 RXD-790/V860/V890 WIRING DIAGRAM USED RXD-790/ RXD-V890 SUPER WOOFER PHONES (PRE OUT) FRONT SPEAKERS AUX INPUT MIC 1 AUDIO UNIT (X09-4XXX-XX) (A/5) USED RXD-V860 (K) : X09-4720-11 MIC 2 (M,I) : X09-4720-20 RXD-790 (X) : X09-4720-71 (H) : X09-4724-11 CONSTANT VOLTAGE UNIT...

  • Page 18: Pc Board

    PC BOARD(Component side view) CASSETTE MECHANISM UNIT TUNER UNIT (X05-4660-11) : KH (X28-2880-20) (X05-4660-20) : MI (X05-4660-71) : X (X05-4752-10) : V Refer to the schematic diagram for the value of resistors and capacitors.
  • Page 19 PC BOARD(Component side view) CD MECHANISM UNIT (X32-3270-20) : RXD-790 Refer to the schematic diagram for the value of resistors and capacitors.
  • Page 20 PC BOARD(Component side view) AUDIO UNIT (X09-48XX-XX) 80-20 [RXD-V860 (MI)] 32-10 [RXD-V860 (V)] Refer to the schematic diagram for the value of resistors and capacitors.
  • Page 21 PC BOARD(Component side view) Refer to the schematic diagram for the value of resistors and capacitors.
  • Page 22 PC BOARD(Component side view) Refer to the schematic diagram for the value of resistors and capacitors.
  • Page 23 PC BOARD(Component side view) Refer to the schematic diagram for the value of resistors and capacitors.
  • Page 24 (X05-4752-10) : V (X05-466X-XX) M,I,X,K,H TYPE 2.1V FM FRONT END A1 (W02-2608-05) 2.7V AM/FM 1.7V (2.0V) 3.7V SYSTEM J2 0 220 1/4W 0.01 (2.0V) 2.1V ANT1 5.1V FM 75Ω (3.0V) Ω FM 300 RF.AMP 10.2V(0V) ANT2 BUFF AM ANT 100K FM IF 1.9V 10.4V...
  • Page 25 50uS: 0V W116 PILOT PHASE DET 0.5V DESTINATION C21, 22 COUNTRY ABB. 4.0V 4.0V GENERAL MARKET 2.2u50 (1.5V) (0V) 0.012 µ MALAYSIA SHANGHAI C11 1u50 U.S.A. 0.018 µ KOREA AUSTRALIA 0.012 FM/AM C23 1u50 5.1V 12.3V RXD-790/V860/V890 (1/8) RXD-790/V860/V890 Y39-2600-20...
  • Page 26 CD CHANGER MECHA. :CDM-27 (D40-1542-X5) (X32-3270-20) PICKUP ASS'Y:T25-0050-05 1/2VCC 0.01 3.6V 13 C1 1/2VCC 3.7V AMP4 BUFFER1 LD GND R2 47K SHORT LAND R3 47K R4 47K VR1 1K R5 47K BUFFER2 FOCUS COIL 0.01 1/2VCC AMP5 TRAKING COIL 3.6V 5.0V DM(-) R98 130K...
  • Page 27 1.3K 3.4V C52 10u50 R110 RXD-790/V860/V890 (2/8) CAUTION: For continued safety, replace safety critical components only with manufacturer's rec- The DC voltage is an actual reading measured with a high impedance type volt- ommended parts (refer to parts list). indicates safety critical components. For continued protec-...
  • Page 28 (X28-2880-20) Lch(+) Lch(-) Rch(+) WHITE GREEN E(+) Rch(-) BLUE Rch(-) GRAY BLUE Lch(+) BLUE E(-) Rch(+) WHITE E(+) BLACK Rch(+) GRAY COM(-) Rch(+) E(-) BLUE BLACK Lch(-) Lch(+) E(-) Lch(+) Lch(+) Rch(+) GREEN BLACK WHITE WHITE WHITE E(+) Rch(-) BLUE GRAY BLUE Rch(+)
  • Page 29 MTZJ2.7(B) 2SC1740S A PLAY : 3.0V A PLAY : 4.0V B PLAY : 0V RECORDING LINE B REC : 0V SIGNAL LINE GND LINE A PLAY : 0V B PLAY : 4.0V RXD-790/V860/V890 (3/8) B REC : 4.0V RXD-790/V860/V890 Y39-2600-20...
  • Page 30 CD UNIT (X32-3440-20) (A/2) : RXD-V860(M,I)/RXD-V890(M,I) CD CHANGER MECHA. :CDM-27 (D40-1562-X5) (X32-3532-10) (A/2) : RXD-V860(V)/RXD-V890(V) PICKUP ASS’Y:T25-0050-05 10.3V 1/2VCC 13.3K 13.3K 1/2VCC DRIVER- T.S.D MUTE SW-GND LD GND SL SW SHORT LAND REGULATOR REGULATOR SLM(-) BIAS T.S.D. MONITOR VR1 1K SLM(+) 13.3K 13.3K...
  • Page 31 5.7V 0.01 DSP+5.0V RXD-790/V860/V890(K) (4/8) The DC voltage is an actual reading measured with a high impedance type volt- meter as the AM/FM signal generator is specified to the conditions as shown in the list below. The measurement value may vary depending on the measuring instru- RXD-790/V860/V890 ments used or on the product.
  • Page 32 AUDIO UNIT (X09-4720-XX) (A/5): RXD-790(M,I,X,H,K) /V890(M,I) (X09-4822-10) (A/5): RXD-V890(V) 12.4V 12.4V -12V -12V -12V +12V +12V +12V +12V +12V C103 C104 R23 33K C157 5P -12.6V 12.4V ADDITION R107 0.1u50 C105 R103 0.33u50 R112 SUPER WOOFER 1u50 (PRE OUT) (1/2)
  • Page 33 : 2SB1370 or 1/4W -0.6V UZ-4.7BSB 2SB1375 180K 1.1V : MTZJ13(B) or : 2SD2061 or C57 22u50 UZ-13BSB 2SD2012 0.7V 3.3K 10u50 RXD-790 (X09-4720-XX) DESTINATION W180,193, CN20, -12V -12V -12V -12V UNIT No. F1,2 F8,9 COUNTRY ABB. 45.5V C167 -47.5V Q13~16 U.S.A.
  • Page 34 AUDIO UNIT (X09-48XX-XX) (A/5): 80-20: RXD-V860(M,I) 32-10: RXD-V860(V) -12V -12V -12V +12V +12V +12V R23 33K C157 5P C103 C104 0.01 0.01 -12.7V 12.3V ADDITION R107 0.1u50 C105 R103 0.33u50 R112 1u50 -12V +12V (1/2) INVERTER (1/2) 4.3V 4.3V 4.3V 4.1V 4.3V 4.3V...
  • Page 35 (M,I) TYPE (X09-4880-20) (D/5) CXD2509Q AC110-120V/ CN10 CN11 220-240V CN14 CN15 50/60Hz X14-A/2 (X09- ) (E/5) +38V +38V AC19.7V CN12 CN13 12 13 T2AL 250V AC5.1V (X32- ) (B/2) T2AL 250V CN16 CN17 X14-A/2 T1A 250V CN11 CN10 RXD-V860(M)(6/8) RXD-790/V860/V890 Y39-2600-20...
  • Page 36 SURROUND UNIT (XO8-28XX-XX) 00-20 : RXD-790(K,M,I,X,H)/RXD-V890(M,I) 32-10 : RXD-V890(V) Sch TEST POINT Cch TEST POINT -12.5V X1 8MHz 12.1V +4.9V TEST POINT 4.7V 0.01 ELECTRIC VOL.(C.SURR) 5.2V 4.7V SOUT (2/2) 2.3V AGND VREF C90 4.7u35 5.1V TEST POINT INV-PHASE 0.3V...

  • Page 37: Parts List

    CENTER 0.01 0.01 R75 1K R74 1K R28 22 1/4W SURROUND L PROTECTION CONTROL OVER CURRENT 32.0V DETECTOR 3.3K SURROUND R PCM1717E 4.7u35 0.01 PROTECTION 680P CONTROL R81 10K RELAY DRIVE 220u10 +13.79V 0.7V 2.2K RXD-790/V890 (K) (7/8) RXD-790/V860/V890 Y39-2600-20...
  • Page 38 DISPLAY UNIT (X14-449X-XX) (A/2) : RXD-790/V860/V890 (X14-465X-XX) (A/2) : RXD-V860/V890 +12V RXD-790/ RXD-V860 V890 +5.6V +5.6V X09-A/5 X09-A/5 D.GND -CN5 -CN5 AMUTE E.VOL ATT CH SP/Q -32V -32V SEL STB PROTECT F.OFF AC(FL) AC(FL) IC CLK -29.3V IC DATA RXD-790/ -29.3V...
  • Page 39 STEREO +5.6V 5.9kHz PEAK HOLD 1.0V 5.0V 14.4kHz -32V PEAK HOLD (BEST HITS) 1.9V or DIGITAL. ECHO +5.6V 0.047 RXD-790 (X14-449X-XX) RXD-V860 (X14-4XXX-XX) RXD-V890 (X14-4XXX-XX) DESTINATION DESTINATION DESTINATION D20, R30,102, D20, R30,102, D20, R30, R102, WH7, UNIT No. UNIT No.
  • Page 40 : W02-2561-05 GND LINE Q1,3-12 : 2SC4081 D12,46,47 : B30-2494-05 +B LINE O.T.E. DOLBY NR IC2 : BA3834S Q13-20 : 2SA1576A(R,S) or 2SB1218A(Q,R) : MTZJ6.8(B) or UZ-6.8BSB -B LINE IC3 : S-806D-Z D49-51 : B30-2468-05 : NJU3714G RXD-790/V860/V890(K) (8/8) RXD-790/V860/V890 Y39-2600-20...
  • Page 41 RXD-790/V860/V890 EXPLODED VIEW (CD MECHANISM) B341 Parts with exploded numbers larger than 700 are not supplied.
  • Page 42 RPEH...
  • Page 43 OPEN/CLOSE ø3x12 : N09-0333-05 S34 S35 S36 S37 S38 ø3x8 : N09-1445-05 DISC SELECTOR ø2.6x8 : N82-2608-45 ø2.6x8 : N89-2608-46 ø3x6 : N89-3006-46 ø3x12 : N89-3012-46 (C/5) (A/3) (D/5) (B/2) (B/3) (B/2) 664 665 (A/2) (C/3) (E/5) (B/5) X28-2880-20 RXD-790/V860/V890...
  • Page 44 ITEM CARTON CASE RXD-V860 A70-1161-05 REMOTE CONTROL ASSY RXD-V860 H50-2598-14 ITEM CARTON CASE RXD-V860 A70-1162-05 REMOTE CONTROL ASSY RXD-V890 H50-2599-04 ITEM CARTON CASE RXD-790 H50-2600-04 ITEM CARTON CASE RXD-790 B10-2390-02 FRONT GLASS RXD-V860 B10-2391-02 FRONT GLASS RXD-790 J19-3325-05 UNIT HOLDER...
  • Page 45 TRANSISTOR RK73FB2A681J CHIP R 1/10W RK73FB2A5R6J CHIP R 1/10W W02-2608-05 FM FRONT-END ASSY R4 ,5 RK73FB2A331J CHIP R 1/10W SURROUND UNIT (X08-28XX-XX) : RXD-790/V890 RK73FB2A101J CHIP R 1/10W RK73FB2A473J CHIP R 1/10W C1 ,2 CE04LW1H010M ELECTRO 1.0UF 50WV RK73FB2A331J CHIP R...
  • Page 46 ALUMINUM ELECTROLYTIC C. HSS104A DIODE L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 47 C119 CC45FSL1H101J CERAMIC 100PF UN4112 DIGITAL TRANSISTOR C120 CE04LW1H010M ELECTRO 1.0UF 50WV C121 CK45FF1H103Z CERAMIC 0.010UF AUDIO UNIT (X09-472X-XX) : RXD-790/V890 C122 CK45FB1H222K CERAMIC 2200PF C123 C91-1551-05 METALIZED POLYESTER FILM C. C1 ,2 CK45FB1H471K CERAMIC 470PF C124,125 CE04LW1HR47M ELECTRO 0.47UF...
  • Page 48 R187,188 RS14KB3D681J FL-PROOF RS L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 49 CE04LW1H010M ELECTRO 1.0UF 50WV L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 50 D1 -6 HSS104A DIODE L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 51 R92-0670-05 CHIP R 0 OHM L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 52 50WV DTA124ESA DIGITAL TRANSISTOR L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 53 Q10 ,11 2SC1845(F,E) TRANSISTOR DTC124ESA DIGITAL TRANSISTOR E40-8037-05 FLAT CABLE CONNECTOR UN4212 DIGITAL TRANSISTOR E40-4979-05 PIN ASSY E40-4377-05 PIN ASSY CD MECHANISM UNIT (X32-3270-20) : RXD-790 E40-4763-05 PIN ASSY E40-3247-05 PIN ASSY CQ93FMG1H103J MYLAR 0.010UF CQ93FMG1H472J MYLAR 4700PF E40-4762-05 PIN ASSY...
  • Page 54 D10 ,11 1SR139-400 DIODE L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 55 (TRAY) D14-0388-08 PINCH ASSY (L) L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...
  • Page 56 N19-1316-08 POLY WASHER 1.8X6X0.5CUT L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860 L : Scandinavia K : USA P : Canada R : Mexico 1 : RXD-790 2 : RXD-V860...

  • Page 57: Specifications

    Tuning frequency range (except for U.S.A. and Canada) 9 kHz step........531 kHz ~ 1,602 kHz 10 kHz step........530 kHz ~ 1,610 kHz 1. KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. Notes Notes 2.
  • Page 58 [FM Tuner section] RXD-V890..............10.8 kg Tuning frequency range ......87.5 MHz ~ 108 MHz RXD-V860..............10.0 kg [AM Tuner section] 1. KENWOOD follows a policy of continuous advancements in devel- opment. For this reason specifications may be changed without Notes Tuning frequency range notice.

This manual is also suitable for:

Rxd-v860Rxd-v890

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