JVC RX-7000RBK Service Manual

SERVICE MANUAL

ENTER

AUDIO/VIDEO CONTROL RECEIVER

RX-7000RBK

Area Suffix

Continental Europe

Northern Europe

RX-7000RBK

TV/CATV/DBS

DVD DVD MUILTI CD TAPE/MD

TV/DBS PHONO FM/AM

ANALOG/DIGITAL

VCR

SURROUND

ON/OFF

123

TEST REAR-L

SURROUND

MODE

456

CD-DISC

EFFECT REAR-R

SOUND

SUBWOOFER

SEA MODE

RETURN

SET

EXIT

CHANNEL VOLUMETV VOL

VCR

TV/VIDEO

TAPE/MD

CONTROL

PLAY

/REW

PTY SEARCH

PTY PTY

STOP PAUSE

REC

RM-SRX7000R REMOTE CONTROL

VCR

SLEEP

CENTER

ENTER

+10

100+FM MODE

AUDIO/ TV/VCR

CATV/DBS

TEXT DISPLAY

MUTING

FF/

RX-7000R AUDIO/VIDEO CONTROL RECEIVER

STANDBY

STANDBY/ON

PHONES

COMPULINK

Remote

ENHANCEDCOMPULINKCONTROL SYSTEM

SPEAKERS

SURROUND ON/OFF

EON

PTY SEARCH

DSP MODE

BALANCE/SURROUND

ADJUST

TA/NEWS/INFO

DISPLAY MODE

SEA MODE

SEA ADJUST

THEATER LIVE CLUB DANCE CLUB HALL PAVILION

INPUT

ANALOG/DIGITAL

FM/AM TUNING TUNER PRESET

TUNER/SEA MEMORY FM MODE

SETTING

SOUND SELECT

INPUT ATT.

BASS BOOST ONE TOUCH OPERATION

SOURCE NAME

DIGITAL

DVD

TV SOUND/DBS PHONO

TAPE/MDVCR

SOURCE SELECTOR

MULTI JOG

–

MASTER VOLUME

DIGITAL

Contents

Safety precautions ---------------- 1-2 Disassembly method ------------- 1-3

This service manual is printed on 100% recycled paper.

Adjustment method --------------- 1-9 Description of major ICs --------- 1-10

No.20846

1-1

Jul. 2000

RX-7000RBK

Safety Precautions

1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical par ts in the products have special safety-related characteristics.

These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)

Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, par ticularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

1-2

Warning

1. This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs must be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

CAUTION

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

RX-7000RBK

Disassembly method

Removing the top cover (See Fig.1)

Remove the four screws A attaching the top cover on both sides of the body.

Remove the three screws B on the back of the body.

Remove the top cover from behind in the direction of the arrow while pulling both sides outward.

Removing the front panel assembly

(See Fig.2 and 3)

Prior to performing the following procedure, remove the top cover.

Disconnect the card wire from connector CN400 on the main board and CN402 on the power supply board in the front panel assembly.

Cut off the tie band fixing the harness.

Main board

CN400

Tie band

Top cover

Fig.1

Front panel assembly

Power supply

board

CN402

Disconnect the harness from connector CN202 on the video board.

Remove the three screws C attaching the front panel assembly.

Remove the five screws D attaching the front panel assembly on the bottom of the body. Detach the front panel assembly toward the front.

Removing the rear panel (See Fig.4)

Prior to performing the following procedure, remove the top cover.

Remove the power cord stopper from the rear panel by moving it in the direction of the arrow.

Remove the twenty-six screws E attaching the each boards to the rear panel on the back of the body.

Remove the three screws F attaching the rear panel on the back of the body.

Video board

CN202

Fig.2

Front panel assembly

Fig.3

Cord stopper

Rear panel

Fig.4

1-3

RX-7000RBK

Removing each board connected to the rear side of the main board

(See Fig.5 to 9)

Prior to performing the following procedure, remove the top cover and the rear panel.

CN202

Cut off the tie band fixing the harness.

Disconnect the harness from connector CN202 on the video board.

Disconnect the tuner board from connector CN101, CN102 on the main board.

Disconnect the SEA board and the audio board from connector CN452, CN301and CN302 on the main board.

Disconnect the V-audio board from connector CN303 on the main board.

Disconnect the relay board 4.Then, disconnect the video board and the S-video board from connector CN201 and CN241 on the main board.

Disconnect the DSP board from connector CN501 and CN601 on the main board while removing the DSP board from the bracket fixing the lower part of the DSP board at the same time.

Disconnect the compulink board from connector CN255 on the main board.

Tie band

Main board

CN101,CN102

SEA board

Tuner board

Main board

CN452

Audio board

Fig.5

Main board

CN302,CN301

Fig.6

S-video board

Video board

V-audio board

Audio board

Bracket

CN201

CN241

Fig.9

DSP board

Main board

CN601

Main board

CN501

Compulink board

Main board

CN255

CN302

CN452

Relay board 4

CN303

CN301

Fig.7

Main board

CN201

Fig.8

Main board

CN303

Main board

CN241

V-audio board

S-video board

Video board

1-4

Removing the main board / regulator board (See Fig.10 to 12)

Prior to performing the following procedure, remove the top cover and the rear panel.

ATTENTION:

Disconnect the card wire from connector CN400 on the main board.

Cut off the four tie bands fixing the harnesses.

Disconnect the harness from connector CN811 on the power transformer board.

Disconnect the relay board 1, 2 and 3 from the main board and the power supply board.

It is not necessary to remove the boards connected to the back of the main board. But to disassemble the main board and the power supply board efficiently, remove them.

Main board

CN400

Tie band

Main board

CN901

CN711

CN712

H H H

CN821

CN931

CN932

Fig.10

CN704

Relay board 1

Relay board 2

CN961

RX-7000RBK

Power supply board

CN811

Relay board 3

Power transformer

Tie band

Disconnect the harness from connector CN704, CN821, CN901, CN711, CN712, CN931 and CN932, CN961.

Remove the screw G attaching the regulator board to the heat sink cover.

Remove the eight screws H attaching the main board to the heat sink cover.

Remove the five screws I and the screw J attaching the main board to the chassis base (The resistor board will come off at the same time).

Removing the resistor board (See Fig.13)

Prior to performing the following procedure, remove the top cover.

Disconnect the harness from connector CN881 on the resistor board.

Remove the screw J attaching the resistor board.

Fig.11

Regulator board

Main board

Fig.12

Resistor board

Power transformer

Main board

Resistor board

CN881

Fig.13

1-5

RX-7000RBK

Removing the amplifier board

(See Fig.10 and 14)

Prior to performing the following procedure, remove the top cover.

Cut off the four tie bands fixing the harnesses.

Disconnect the harnesses from connector CN711, CN712, CN704 and CN901 on the main board respectively.

Remove the four screws K and six screws L attaching the amplifier board.

If necessary, unsolder the harness connected to connector CN803 and CN952 on the amplifier board.

Removing the power transformer

(See Fig.15)

Prior to performing the following procedures, remove the top cover.

Unsolder the two harnesses connected to the power transformer.

Disconnect the harness from connector CN811 and the harnesses connected to connector CN55 and CN56 on the power transformer board.

Main board

CN400

Tie band

Main board

CN711

Amplifier board

CN901

CN712

CN711

CN821

CN931

Fig.10

CN952

Fig.14

CN704

CN932

CN803

CN712

Relay board 1

Relay board 2

Power supply board

CN961

Tie band

CN811

Relay board 3

Power transformer

Tie band

Remove the four screws M attaching the power transformer.

Removing the power / fuse board

(See Fig.16)

Prior to performing the following procedure, remove the top cover and the rear panel.

Remove the screw N attaching the power / fuse board.

Unsolder the power cord and other harnesses connected to the power / fuse board.

Solder

Fig.15

Power cord

CN55 CN56

CN811

Power transformer

Solder

Power / fuse board

1-6

Fig.16

Removing the power supply board

(See Fig.17 and 18)

Prior to performing the following procedure, remove the top cover and the front panel.

Remove the one nut attaching the headphone jack of the power supply board on the front side of the body.

RX-7000RBK

Disconnect the relay board 1, 2 and 3 from the power supply board and the main board respectively.

Disconnect the harness connected to connector CN55 and CN56 on the power transformer board (If necessary, cut off the two tie bands fixing the harness on the side of the chassis base).

Remove the four screws O attaching the power supply board and pull out the power supply board from the front bracket backward.

Unsolder the three harnesses connected to the power supply board.

Removing the system control board / power switch board (See Fig.19 to 20)

Prior to performing the following procedure, remove the top cover and the front panel assembly.

Pull out the volume knob on the front side of the front panel and remove the nut attaching the system control board.

Power supply board

Relay board 2

Relay board 3

Fig.17

Relay board 1

Fig.18

Headphone jack

Nut

Power supply board

Headphone jack

Power transformer

Nut

Front panel

Solder

Tie band

CN55 CN56

Tie band

Remove the six screws P attaching the system control board on the back of the front panel and disconnect the harness from connector CN422 on the system control board.

Disconnect the harness from connector CN430 on the power switch board.

Remove the five screws Q attaching the power switch board.

System control board

Front panel assembly

Fig.19

Fig.20

Volume knob

CN422

Power switch board

CN430

1-7

RX-7000RBK

Removing the operation switch board

(See Fig.21 to 23)

Prior to performing the following procedure, remove the top cover, the front panel assembly and the system control board.

Remove the six screws R attaching the operation switch board on the back of the front panel.

On the back of the front panel, release the four joints by pushing the joint tabs inward. Remove the operation switch board toward the front.

Pull out the multi jog knob and the source selector knob.

Remove the two screws S attaching the operation switch board.

Front panel

Joint

Fig.21

Multi jog knob

Source selector knob

Fig.22

Operation switch board

Fig.23

1-8

Adjustment method

Power amplifier section

Adjustment of idling current

Measurement location TP781 Adjustment part VR787(Lch) , VR788(Rch)

Attention This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an internal temperature has risen). Please adjust immediately after using the amplifier after turning off the power supply of the amplifier and falling an internal temperature.

1.Set the volume control to minimum during this adjustment.(No signal & No load)

2.Set the surround mode OFF.

2.Turn VR787 and VR788 fully counterclockwise to warm up before adjustment. If the heat sink is already warm from previous use the correct adjustment can not be made.

3.For L-ch,connect a DC voltmeter between TP781's pin1 and pin2 (Lch) And,connect it between pin3 and pin4(Rch).

4.30 minutes later after power on, adjust VR787 for L-ch, or VR788 for R-ch so that the DC voltmeter value has 1mV~10mV.

RX-7000RBK

* It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR787,VR788) in the direction of counterclockwise.

VR787 (Lch)

Rch

Lch

4321

TP781

VR788 (Rch)

Heat sink

Main board

1-9

+ 18 hidden pages