Jvc XM-R700-SL Service Manual

SERVICE MANUAL

PORTABLE MINIDISC RECORDER

XM-R700SL

US Singapore

XM-R700SL

Area Suffix

Contents

Safety Precautions Important for laser products Attention when

MD pick up is exchanged

Disassembly method

Adjustment method

Maintenance of laser pickup Replacement of laser pickup Description of major ICs

1-2 1-3

1-4 1-5 1-15 1-17 1-17 1-18~37

No.20911

Jan. 2001

XM-R700SL

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 parts 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.

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

Move the resistor connection to eachexposed metal part, particularly 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.).

0.15 F AC TYPE

1500 10W

Place this probe on each exposed metal part.

This corresponds to 0.5 mA AC (r.m.s.).

Good earth ground

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.

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.

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Important for laser products

XM-R700SL

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible

laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e)

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen. (d)

ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)

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XM-R700SL

Attention when MD pick up is exchanged

1. About the static electricity protection measures

The laser diode in the traverse unit (optical pick up) is easy to be destroyed by clothes and the human body to the electrified static electricity. Please note the explosion by static electricity when repairing.

2. About the earth processing for the electrostatic destruction prevention

In the equipment which uses an optical pick up (laser diode), an optical pick up is destroyed by the static electricity of the work environment. Please do the earth processing and work.

1) Earth of work stand Please pull the conductive material (conductive sheet) or the iron plate to the depository place of the traverse unit (optical pick up), and take the earth to ground.

2) Human body earth Please use the anti-static wrist strap to exhaust the electrified static electricity to the human body.

anti-static wrist strap

Conductive material (conductive sheet) or the iron plate

3. Handling the optical pick up

1) Please return according to a correct procedure based on short processing after exchanging parts.

2) Do not use a tester to check the condition of the laser diode in the optical pick up .The tester 's internal power source can easily destroy the laser diode.

4. Attention when unit is disassembled

Please refer to "Disassembling method" for how to detach .

1) Please be sure to solder before a flexible wire is removed from connector on a main printed circuit board as shown. if you removes without soldering.the MD picking up assembly might destroy

2) When installing , solder in the part of short round should be removed after a flexible wire is connected with connector.

Solder short

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XM-R700SL

Disassembly method

Removing the MD door assembly and the bottom cover (See Fig. 1 to 6)

Turn over the body and remove the six screws A attaching the bottom cover.

Release the joint a outside and remove the bottom cover.

ATTENTION:

Disconnect the flexible wires from connector CN522 and CN571 on the main board.

ATTENTION:

When reattaching the bottom cover, fit the hole knobs b to the hold switches on the main board correctly (See Fig.1 and 2).

Peel off the adhesive tapes attaching the flexible wires. Whenreconnecting the flexible wires to the connectors, fix them with adhesive tapes (SeeFig.2).

Bottom cover

Hole knobs b

Joint a

Hold switches

Fig.1

Main board

Turn the MD door assembly up and open the door by sliding the door lever.

Remove the one screw B and the two screws C attaching the MD door assembly.

MD door assembly

Adhesive tape

CN571

Fig.2

CN522

door lever

Fig.3Fig.4

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XM-R700SL

Unhook the joint tab c on the left side, then the right side of the MD door.

Remove the MD door assembly from the body while pulling out the flexible wires another end of which has already disconnected as shown in Fig.7.

Left

ATTENTION:

When pulling out the flexible wires, get it through the opening of themain board and the cabinet.

Removing the main board

(See Fig.7 to 10)

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

ATTENTION:

Before disconnecting the flexible wire extending from the pickup, makesure to solder the short circuit round to prevent damage to the pickup.

MD door assembly

Right

Holder assembly

Tab c

Fig.5

MD door assembly

Holder assembly

Turn the body and disconnect the flexible wire from connector CN522, CN571, CN-401 and CN701 onthe main board respectively.

ATTENTION:

Peel off the adhesive tapes attaching the flexible wires. Whenreconnecting the flexible wires to the connectors, fix them with adhesive tapes (SeeFig.2).

Main board

CN701

CN401

Fig.6

CN571

Fig.7

Short circuit round

CN300

CN522

Battery lead

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XM-R700SL

Remove the two screws D and the one screw E attaching the main board.

Move the battery lead on the side of the body in the direction of the arrow and removethe screw F attaching the main board and the cabinet assembly.

Remove the main body in the direction of the arrow while releasing the part d, thenpart e of the cabinet assembly from the flame assembly.

ATTENTION:

When reassembling, connect the flexible wire extending from the pickupto the connector on the main board and unsolder the short circuit round.

Main board

CN300

Short circuit round

Solder

Fig.8

Main board

Battery lead

Removing the MD mechanism assembly

(See Fig.11)

Prior to performing the following procedures, remove the MD door assembly, thebottom cover and the main board.

Remove the two screws G and detach the MD mechanism assembly from the cabinetassembly.

Part d

Cabinet assembly

Fig.10Fig.9

MD mechanism assembly

Part e

Cabinet assembly

Fig.11

1-7

XM-R700SL

Removing the jog assembly

(See Fig.7 and 11)

Prior to performing the following procedures, remove the MD door assembly and the bottom cover.

Disconnect the flexible wire from connector CN--- on the main board (See Fig.7).

Remove the screw H attaching the jog assembly on the right side of the cabinet assembly.

Slide and release the three joints f attaching the jog assembly, and pull out the jog assembly fromthe part g on the cabinet assembly.

Jog assembly

Part g

Joints f

Fig.12

Removing the LCD assembly and the 5 key sheet (See Fig.12 to 15)

Prior to performing the following procedures, remove the MD door assembly and the bottom cover.

Remove the two screws I and the one screw J attaching the door plate on the inside of the MDdoor assembly. Peel off the adhesive tape attaching the flexible wire.

Pull out the door plate assembly in the direction of the arrow from the part h on the MD doorassembly.

Remove the LCD assembly and the 5 key sheet from the door plate assembly (They are attachedwith the adhesive tapes).

Door plate assembly

Part h

Adhesive tape

5 key sheet

Part h

Door plate assembly

MD door assembly

Fig.13

LCD assembly

1-8

Door plate assembly

Fig.15Fig.14

XM-R700SL

< Removal of the MD mechanism >

Removing the Magnetic head board (See Fig.1 and 2)

Disconnect the magnetic head flexible harness from the connector of the magnetic head board on the holder assembly.

Remove the screw A attaching the magnetic head board and pull out the magnetic head board from the slit (a) in the direction of the arrow.

Removing the Magnetic head assembly (See Fig.2 to 5)

Disconnect the magnetic head flexible harness from the connector of the magnetic head board on the holder assembly.

Slit a

Holder assembly

Magnetic head board

Magnetic head flexible harness

Fig. 1

Push the convex part b on the right side of the head protector in the direction of the arrow. Lift the right edge of the head protector (See Fig.4).

Pull the left tab of the head protector from the slit (See Fig.5).

Remove the two B screws attaching the magnetic head assembly on the underside of the chassis assembly.

Pull out the magnetic head assembly in the direction of the arrow while paying attention to the magnetic head.

Chassis assembly

Fig. 2

Part c

Magnetic head flexible harness

Magnetic head

Magnetic head board

Magnetic head flexible harness

Magnetic head assembly

Pull

Head protector

Holder assembly

Pickup assembly

Fig. 3

Magnetic head assembly

Underside of the chassis assembly

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XM-R700SL

CAUTION:

When reassembling the magnetic head assembly, reverse the order of the removing procedure.

Attach the magnetic head assembly by cramping the MD mechanism assembly. Then, fix the magnetic head assembly to the pickup assembly on the underside of the chassis assembly by tightening the two B screws.

Attach the left edge of the head protector and the right edge.

Connect the magnetic head flexible harness to the connector on the magnetic head board.

Removing the Holder assembly

(See Fig.3 and 6)

Prior to performing the following procedure, remove the magnetic head assembly.

Remove the screw C of the chassis assembly part c and lift the edge of the holder assembly in the direction of the arrow d (See Fig.3).

Move the part e of the holder assembly in the direction of the arrow to release the U-shaped notch from the shaft.

Right side of the head protector

Slit

Lift up

Convex part (b)

Push

Fig. 4

Left side of the head protector

Pull

Fig. 5

Pull the part f of the holder assembly in the direction of the arrow to release it from the shaft.

Holder assembly

U-shaped notch

Chassis assembly

Shaft

Part e

Chassis assembly

Holder assembly

Part f

Shaft

1-10

Fig. 6

Chassis assembly

XM-R700SL

Removing the Pickup unit

(See Fig.7 and 8)

Prior to performing the following procedure, remove the magnetic head assembly.

Remove the two D screws fixing the main shaft of the pickup unit on the underside of the chassis assembly. Remove the pickup unit by pulling out the part g in the direction of the arrow.

Remove the screw E attaching the lead spring on the pickup unit.

Remove the main shaft from the pickup unit.

Pickup unit

Main shaft

Part g

Fig. 7

Pickup unit

Lead spring

Main shaft

Fig. 8

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XM-R700SL

Removing the Flexible harness assembly and the Protective/reflective switch assembly (See Sig.9 to 11)

Peel the double-sided tape attaching the flexible harness on the feed motor on the underside of the chassis assembly.

Unsolder the flexible harnesses connected to the part h of the spindle motor, the part i of the feed motor and the part j of the lift motor.

Remove the two F screws attaching the flexible harness assembly and the protect/ reflect switch assembly respectively.

Part h - unsoldering

Double-sided tape

Feed motor

Flexible harness

Peel off

Feed motor

Peel off

Part i - unsoldering

Flexible harness assembly

Spindle motor

4. Pull out the part k and l in the direction of the arrows respectively and remove the flexible harness assembly and the protective / reflective switch assembly.

Lift motor

Part k

Flexible harness assembly

Part j - unsoldering

Part l

Part k

Protective/ reflective switch assembly

Part l

Fig. 9

Pull out

Lift motor bracket

Fig. 10

1-12

Protective/reflective switch assembly

Fig. 11

Chassis assembly

XM-R700SL

Removing the Lift motor

(See Fig.12 and 13)

Unsolder the part j of the flexible harness connected to the lift motor on the underside of the chassis assembly.

Remove the two G screws attaching the lift motor bracket.

Remove the lift motor with the lift motor bracket by pulling out the part k.

Lift motor

Flexible harness assembly

Part k

Part j - unsoldering

Lift motor bracket

Fig. 12

Removing the Spindle motor (See Fig.14)

Prior to performing the following procedure, remove the flexible harness assembly.

Remove the three H screws attaching the spindle motor on the underside of the chassis assembly.

Pull out

Lift motor bracket

Fig. 13

Fig. 8

Spindle motor

Fig. 14

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XM-R700SL

Removing the Feed motor

(See Fig.15 and 16)

Prior to performing the following procedure, remove the magnetic head assembly and the pickup unit.

Peel the double-sided tape attaching the flexible harness on the feed motor on the underside of the chassis assembly.

Unsolder the part i of the flexible harness connected to the feed motor.

Remove the two I screws attaching the feed motor base, then the feed motor base and the feed motor.

Flexible harness

Peel off

Double-sided tape

Feed motor

Fig. 15

Feed motor base

Feed motor

When connecting the flexible harness to the feed

motor, use the double-sided tape to stick them fast.

(See Fig.17)

Part i

Fig. 16

Flexible harness

Double-sided tape

Feed motor

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Fig. 17

Adjustment method

(Adjustment should done when change the PICKUP, mechanism, Printed circuit board.)

XM-R700SL

Open the bottom cover

Joint the AC adaptor to main body

Powe OFF condition

Press EDIT key keep pressing condition with press B.SKIP(|<<) key more than 3sec.

Set change to TEST MODE

Select

Press PLAY key, clear the last adjust ment data

Select DA (Voltage adjustment)

(servo initialize)

LCD full on then indicate TEST MODE Select the item by F.SKIP(>>|),B.SKIP key

Adjustment DISC Pre mastered(PRE DISC):TGYS 1 Recordable (MO DISC):AU-1 or full recorded normality set 80min tracking off set adjust:SONY 80min DISC

Press PLAY key, goto the voltage adjust mode

Select

(Play laser)

Press PLAY key

Insert the laser power meter sensor

Adjust more than 875 W and more cross this

Select

(Rec laser)

Press PLAY key

Adjust the voltage to less than 2.7V or same as 2.7V at test point (VCC and GND)

Adjustment mode of playback laser power

Adjust the laser power by F.SKIP, B.SKIP then fix by STOP key Adjust to more than 875 W or same as 875 W

Adjust ment mode of recording laser power

Continue next page

1-15

XM-R700SL

From the previous page

Insert the laser power meter sensor

Adjust less than 6.32mW and more cross this

Select

Insert the adjustment DISC (TGYS 1)

Press PLAY key

Start adjustment (auto adjustment)

Complete the adjustment

Press STOP key then eject DISC

Select

Adjust the laser power by F.SKIP, B.SKIP then fix by STOP key Adjust to less than 6.32mW or same as

6.32mW

LCD indication

Insert the adjustment DISC (AU-1)

Press PLAY key Start the adjustment (auto adjustment)

Complete the adjustment

Press STOP key then eject DISC

Select R_TOF AUTO

Insert the adjustment DISC (SONY 80min DISC)

Press PLAY key Start adjustment (auto adjustment)

Complete the adjustment

Press STOP key then eject DISC

LCD indication

Power off by release the AC adapter

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XM-R700SL

Maintenance of laser pickup

(1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab.

(2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear.

1. The level of RF output (EFM output:ampli tude of eye pattern) will below.

Is the level of

RFOUT under

0.35Vp-p?

YES

O.K

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect the power cord from the ac outlet.

Replace the pickup with a normal one.(Refer to "Pickup Removal" on the previous page)

Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at TP1.

Finish.

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged due to excessive current.

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XM-R700SL

Description of major ICs

CXA2523AR (IC300) : MD servo

1.Block diagram

BOTM

ABCD34FE33AUX32ADFG31ADAGC30ADIN29ADFM28SE27CSLED26TE25WBLADJ

36 35

PEAK

39RFAGC

40AGCI

41COMPO

42COMPP

43ADDC

44OPO

45OPN

46RFO

47MORFI

MORFO

2.Pin function

Pin No.

Symbol

1 2 3 4 5 6 7 8

9 10 11 12

APCREF 13 14 15 16 17 18 19 20

TEMPI

TEMP R

SWDT

SCLK

XLAT XSTBY F0CNT

A B C D E F

APC

GND

AGC, EQ

Comp

USER

OP Amp

RF Amp

1 2

I/O

ADIP Amp TE/SE Amp

MUX FE Amp

Peak, Bottom Detector

ABCD Amp

3T Detector

I-V Amp APC

3VC4A5B6C7D8E9F10PD11

CPU

Command I/F

TEMP Amp

APC

APCREF

Vcc

3TADJ

22 EQADJ

21 VREF

20 F0CNT

19 XSTBY

18 XLAT

17 SCLK

16 SWDT

15 TEMP R

14 TEMP I

13 GND

Function

I-V converted RF signal I input.

I-V converted RF signal J input.

Vcc/2 voltage output.

A current input for main beam servo signal.

B current input for main beam servo signal.

C current input for main beam servo signal.

D current input for main beam servo signal.

E current input for side beam servo signal.

F current input for side beam servo signal.

Reflection light quantity monitor signal input.

Laser APC output.

Reference voltage input for the laser power intensity setting.

Connect to GND.

Connects the temperature sensor.

Connects the temperature sensor. outputs the reference voltage.

Data input for microcomputer serial interface.

Shift clock input for microcomputer serial interface.

Latch signal input for microcomputer serial interface.Latched when low.

Standby setting pin. Normal operation when high Standby when low.

Internal current source setting pin.

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