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Kenwood R-V251 Service Manual

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AV SURROUND RECEIVER
R-V251
SERVICE MANUAL
ON/STANDBY
INPUT
TAPE 2
(MONITOR)
PHONES
TIMER
CLOCK MODE
SET
Button(L)
(K29-6816-02)
Metallic cabinet
(A01-3750-08)
ANTENNA
Lock terminal board
(E70-0120-08)
Caution : No connection of ground line if disassemble the unit.
Please connect the ground line on rear panel, PCBs, Chassis and some
others.
Panel dressing
(A21-3777-03)
AV SURROUND RECEIVER R-V251
Lock terminal board
(E70-0119-08)
Phono jack(4P)
(E63-0186-08)
1
CD
3
AUX
Ω
FM 75
AM
GND
2
4
IN
IN
35
R
37
L
39
C
33
R
31
L
43
( 6-16Ω )
SUB WOOFER
REAR
CENTER
FRONT
PRE OUT
36
38
SPEAKERS
40
34
32
Phono jack
(E63-1137-08)
Lock terminal board
(E21-0034-08)
© 1999-8/B51-5562-00 (K/K) 1792
Window
(B10-2367-02)
TA/NEWS
PTY
/INFO.
DISP.
Phono jack(6P)x
(E63-0187-08)
AUDIO
VCR
TAPE 2
REC
PLAY
9
(MONITOR)
11
5
TAPE1 / MD
7
L
R
10
REC
12
PLAY
5
REC
7
PLAY
DVD 6CH./2CH.INPUT
L
15
17
19
VCR
VCR
SYSTEM
REC OUT
PLAY IN
FRONT SURROUND CENTER
CONTROL
MONITOR
SUB WOOFER
22
DVD
OUT
16
R
18
20
VIDEO
Phono jack(6P)
(E63-1136-08)
Phono jack(4P)
Phone jack
(E63-1152-08)
(E11-0188-05)
* Refer to parts list on page 25
Panel *
(A60-)
VOLUME CONTROL
MODE
MULTI CONTROL
LEVEL
DOWN
UP
AUTO A.MEMO BAND
TUNING
Button(R) *
Knob
(K29-)
(k29-6727-04)
Power cord bushing
(J42-0346-08)
AC power cord *
(E30-)
2
UNSWITCHED TOTAL
150W MAX.
AC 230V
50Hz
AC outlet *
(E03-)
70%

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Summary of Contents for Kenwood R-V251

  • Page 1 AV SURROUND RECEIVER R-V251 SERVICE MANUAL © 1999-8/B51-5562-00 (K/K) 1792 Panel dressing Window Panel * (A21-3777-03) (B10-2367-02) (A60-) VOLUME CONTROL AV SURROUND RECEIVER R-V251 ON/STANDBY MODE MULTI CONTROL INPUT TAPE 2 LEVEL (MONITOR) DOWN TA/NEWS PHONES TIMER /INFO. DISP. AUTO A.MEMO BAND...

  • Page 2: Table Of Contents

    R-V251 CONTENTS / ACCESSORIES / CAUTIONS Contents CONTENTS / ACCESSORIES / CAUTIONS..... 2 SCHEMATIC DIAGRAM .......... 13 BLOCK DIAGRAM ............3 EXPLODED VIEW ............24 CIRCUIT DESCRIPTION ..........4 PARTS LIST..............25 ADJUSTMENT ............8 SPECIFICATIONS ............31 PC BOARD ..............9 Accessories FM indoor antenna (1)

  • Page 3: Block Diagram

    VIDEO PLAY +7V(E.VOL) IC101 7815 DVD/GCH INPUT +15V IC102 MONITOR OUT 7915 -15V -5V(VIDEO SEL) VIDEO REC FILAMENT AC VIDEO -7V(E.VOL) FLT701 SELECTOR GRID Q101 -30V FL DISPLAY FL DISPLAY SEGMENT IC701 u-COM KEY SCAN +5V(u-COM) KEY MATRIX KEY RETURN R-V251...

  • Page 4: Circuit Description

    R-V251 CIRCUIT DESCRIPTION 1. Microprocessor : (FRONT PCB,IC701) 1-1. Pin description Active Pin. No. Pin Name Description G1,G2 FL grid control. PULL UP Connected to VCC(+5.0V). POWER DOWN AC selector. VOL. UP Volume encoder A(CW) signal. RDS CLK RDS IC(IC703) clock input control.
  • Page 5 R-V251 CIRCUIT DESCRIPTION Active Pin. No. Pin Name Description POWER RLY Power relay control. 10dB. ATT Volume 10dB attenuator control. ST. LED STANDBY LED control(RED). ST. LED STANDBY LED control(GREEN). 60~69 Unused. 70~77 9S~16S FL segment(9~16) and key scan(1~8) control.
  • Page 6 R-V251 CIRCUIT DESCRIPTION Pin No. Name Description AVD2 R-ch AD converter power supply. ROUT R-ch DA converter output. AVD4 R-ch DA converter power supply. AVS4 R-ch DA converter GND. VSS3 Digital GND. Shift clock input for microcomputer interface. REDY Transfer enabling signal output for microcomputer interface.
  • Page 7 R-V251 CIRCUIT DESCRIPTION 4. Function table 4-1. Mode selector: KIC9163AN(IC106) IC CHANNEL IC PORT SURROUND prologic stereo 6ch input prologic prologic 6ch input prologic SPEAKER FLch FRch FLch FRch FLch FRch SLch SRch SLch SRch SLch SRch Cch SWch Cch...

  • Page 8: Adjustment

    R-V251 ADJUSTMENT Tuner adjustment FIG. OUTPUT TUNER ALIGNMENT ITEM INPUT SETTING ALIGN FOR SETTING SETTING POINTS FM SECTION BAND : FM Connect a CARRIER FREQ. : 98.0MHz MONO MOD FREQ. : 1kHz T402 0V±50mV DISCRIMINATOR : ±75kHz DEVIATION 98.0MHz voltmeter to...

  • Page 9: Pc Board

    PC BOARD (Component side view) MAIN UNIT IC104 IC103 ZD202 ZD201 C199 ZD204 ZD203 R252 R251 C222 J162 C193 C207 R225 C211 R240 C221 J102 C245 Q215 Q217 R255 R237 R226 R256 R262 R261 R213 C202 C197 C198 R220 R239 C215 C209 C214...
  • Page 10 PC BOARD (Component side view) FRONT UNIT C702 C703 FLT701 VOLUME UNIT J746 J745 J786 SW722 J701 J744 J762 SW715 J702 R708 J763 J785 R709 R710 IC701 VOLUME J781 J787 R711 CONTROL R705 R769 J788 J782 R765 X701 J712 J703 R713 R706 R764...
  • Page 11 R426 3.3K R425 3.3K R424 3.3K C419 470P R423 3.3K R-V251 (1/3) R-V251 The DC voltage is an actual reading measured with a high impedance type voltmeter as the AM/FM signal generator is specified to MODULATION MODE CARRIER ANT INPUT the conditions as shown in the list below.
  • Page 12 MAIN UNIT The DC voltage is an actual reading measured with a high impedance type volt- JK102 meter as the AM/FM signal generator is specified to the conditions as shown in the R151 list below. The measurement value may vary depending on the measuring instru- ments used or on the product.

  • Page 13: Schematic Diagram

    MAIN UNIT C IN 0.01 R136 L S IN SW IN 100K IC103 POWER AMP (FRONT) 100P -15.1V 14.9V IC113 IC113 (2/2) (1/2) R134 3.3K R288 100K 6.6V R133 C148 C150 C149 C160 C159 100P 100P 100P 100P 100P -44.2V IC107 (BOTTOM VIEW)
  • Page 14 : 1SS133 ZD22 IC102 W503 25.3V 1/4W C09 0.01 12.1V TF150 C 48.7V BD101 BD102 -31.2V CN102 -48.7V -25.3V CNT101 FRONT -CNT701 JK103 4.6V SYSTEM CONTROL 12 13 14 15 16 17 18 19 CN102 CN110 R-V251 (2/3) R-V251 Y05-4032-70...
  • Page 15 VOLUME UNIT SENSOR UNIT FRONT UNIT RMC701 SW722 +5.6V +5.6V REMOTE SENSOR VOLUME DISP CONTROL 31.2V 31.2V 31.2V SW719 SW718 SW711 AR702 AR701 100Kx8 100Kx8 C718 R761 0.01 BAND MEMO AUTO C717 R760 SW720 SW717 SW712 C716 ON/ST INPUT INPUT TAPE2 0.01 100u10...
  • Page 16 R731 47K : KDS160 D704,708,711,712,715,716 R732 10K : 1SS133 R729 470 DSP CLK R728 470 ZD701 : MTZJ6.2B DSP DATA R727 470 DSP READY R726 470 S.LEVEL SIGNAL LINE GND LINE B LINE B LINE R762 R-V251 (3/3) R-V251 Y05-4032-70...
  • Page 17 ø3x8 (BLK) N89-3008-45 ø3x8 N89-3008-46 ø2.6x8 N82-2608-46 MULTI VOLUME M4x8 N86-4008-46 CONTROL CONTROL MODE LEVEL SW722 ø3x18 N09-2912-05 SW713 SW716 SW721 ø3x6 N89-3006-46 TA/NES/INFO DISP AUTO A.MEMO BAND TUNING WASHER N15-1030-46 SW711 SW718 SW719 SW712 SW717 SW720 SW714 SW715 R-V251...
  • Page 18 Parts No. Description Ref. No Parts No. Description ress Parts nation marks ress Parts nation marks CE04KW1H470M ELECTRO 47UF 50WV R-V251 CE04KW1H4R7M ELECTRO 4.7UF 50WV CE04KW0J221M ELECTRO 220UF 6.3WV A01-3750-08 CABINET 3000020216020 CE04KW1A101M ELECTRO 100UF 10WV A09-0378-08 BATTERY COVER C26 ,27...
  • Page 19 New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 20 New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 21 New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 22 New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 23 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. Add- Desti- Ref. No Parts No. Description ress Parts nation marks Q204 2SA916Y SEMI,TR/GE PNP Q205,206...

  • Page 24: Exploded View

    (composite) ............1 Vp-p / 75 Ω Weight (net) ..............8.9 kg 1. KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. 2. Full performance may not be exhibited in extremely cold locations (below 0 deg.C).

  • Page 25: Parts List

    (composite) ............1 Vp-p / 75 Ω 1. KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. 2. Full performance may not be exhibited in extremely cold locations (below 0 deg.C).

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