JVC UXV-10 Service manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-V10

AUTO TAPE SELECTOR

TAPE

AUTO REVERSE

UX-V10

AUTO

FM

DISPLAYSLEEP

PRESET

MODE

TAPE CD

AUX

FM/AM

CD

REPEAT

UP

SET

PROGRAM

DOWN

RANDOM

AHB

CANCELTREBLE

BASS

PRO

VOLUME

REMOTE CONTROL RM-SUXV10E

Contents

Safety precautions Important for laser products Disassembly method Main adjustment Flow of functional operation until TOC read

STANDBY

PHONES

1-2 1-4 1-5 1-15

1-19

AUX

REC

REV MODE

.

TAPE

COMPACT

DIGITAL AUDIO

VERTICAL DISC

LOADING MECHANISM

MICRO COMPONENT SYSTEM

UX-V10

AHB PRO

VOLUME

TIMER

CLOCK

CD

OPEN/CLOSE

FM/AM

CD

DOWNUPMULTI CONTROL

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

UF

UN

Area Suffix

China

Indonesia

1-20 1-20 1-21

This service manual is printed on 100% recycled paper.

No.20893

1-1

Dec. 2000

UX-V10

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 proper ty 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 or iginal 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.

UX-V10

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.

2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; further more the manufacturer cannot accept responsibility f or personal injury or property damage resulting therefrom.

3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never be replaced by parts other than those listed in the manual. Please note

however that many electrical and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts shown in the Parts List of the Service Manual and 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 or iginal lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

(U.K only)

Warning

1. Service should be performed by qualified personnel only.

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

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

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

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

6. 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.

1-3

UX-V10

Important for laser products

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

1-4

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Disassembly method

Removing the rear cover

(See Fig.1 and 2)

1.

Remove the eight screws A attaching the rear cover on the back of the body.

2.

Remove the two screws B attaching the rear cover on the bottom of the body.

3.

Unlock the speaker terminal and the antenna terminal, then remove the rear cover backward with releasing the hooks.

Removing the side panels

(See Fig.3 and 4)

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

A

Rear cover

Fig.1

B

Rear cover

1.

Move the side panels in the direction of the arrow and remove them backward.

Side panel (R)

B

Fig.2

Side panel (L)

Fig.3Fig.4

1-5

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Removing the cassette mechanism assembly (See Fig.5 and 6)

Prior to performing the following procedure, remove the rear cover and the side panels.

1.

Disconnect the card wires from connector CN304 and CN305 on the main board on the left side of the body.

2.

Disconnect the harness from connector CN309 on the Opt, Dig.out board on the right side of the body. Cut off the band fixing the harness.

3.

Remove the two screws C attaching the cassette mechanism assembly on both sides of the body and release the two joints a.

4.

Remove the cassette mechanism assembly in the direction of the arrow.

Cassette mechanism assembly

Main board

Fig.5

Cassette mechanism assembly

Joint a

C

Joint a

C

CN304

CN305

Opt, Dig.out board

Band

CN309

Removing the main board / the heat sink

(See Fig.7 to 9)

Prior to performing the following procedure, remove the rear cover, the side panels and the cassette mechanism assembly.

1.

Disconnect the card wire from connector CN303 and the harness from CN306 and CN307 on the main board respectively.

2.

Disconnect the harness from connector CN902 on the power transformer.

3.

Remove the screw E attaching the main board on the right side of the body.

4.

Remove the screw F and the two screws G attaching the heat sink on the back of the body.

ATTENTION:

5.

Disconnect connector CN301 and CN302 on the main board from the main body. Remove the main board upward by releasing the two joints b in the lower part of the main board.

The heat sink can be removed even if the main board is attached to the body.

CN303

Fig.6

Transformer board

CN902

CN307

Main board

Heat sink

CN306

Fig.7

Main board

1-6

CN302

Joint b

E

CN301

Joint b

Fig.8

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Removing the front panel assembly

(See Fig.10 to 12)

Prior to performing the following procedure, remove the rear cover, the side panels, the cassette mechanism assembly and the main board.

1.

Disconnect the card wire from connector CN732 on the LCD board.

2.

Remove the two screws D attaching the front panel assembly on the bottom of the body.

F

Front panel assembly

G

Heat sink

Main board

G

Fig.9

Tuner & function board

3.

Release the two joints c on the lower right and left sides of the body. Pull out the front panel assembly toward the front.

Removing the head phone board

(See Fig.13)

Prior to performing the following procedure, remove the rear cover, the side panels, the cassette mechanism assembly, the main board and the front panel assembly.

1.

Remove the plastic rivet attaching the head phone board and release the joint d.

Joint c

Front panel assembly

D

LCD board

Fig.10

Fig.11

CN732

Front panel assembly

Plastic rivet

Joint d

Fig.12Fig.13

Joint c

1-7

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Removing the tuner & function board

(See Fig.14)

Prior to performing the following procedure, remove the rear cover, the side panels and the cassette mechanism assembly.

1.

Disconnect the card wire from connector CN1 on the tuner & function board.

2.

Remove the screw H attaching the tuner & function board.

3.

Release the two joints e and the joint f of the tuner & function board.

Removing the power transformer

(See Fig.15)

Prior to performing the following procedure, remove the rear cover, the side panels and the cassette mechanism assembly.

1.

Disconnect the harness from connector CN902 on the power transformer.

2.

Disconnect the harness from connector CN901 on the AC supply board.

3.

Remove the four screws I attaching the power transformer.

CN1

Main board

CN902

I

H

J

Joint e

Heat sink

Tuner & function board

Joint f

Fig.14

AC supply board

J

CN901

I

Removing the AC supply board

(See Fig.15)

*Prior to performing the following procedure, remove the rear cover, the side panels and the cassette mechanism assembly.

1.

Disconnect the harness from connector CN901 on the AC supply board.

2.

Remove the screw F attaching the heat sink on the back of the body (Refer to Fig.9).

3.

Remove the two screws J attaching the AC supply board.

ATTENTION:

1-8

To remove the AC supply board efficiently, remove the main board in advance.

Power transformer board

Fig.15

Prior to performing the following procedure, remove the rear cover, the side panels and the cassette mechanism assembly.

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Cassette door

Removing the Opt.Dig.out board

(See Fig.16)

1.

Remove the two screws K attaching the Opt.Dig.out board on the side of the cassette mechanism assembly.

Removing the cassette mechanism assembly (See Fig.16 and 17)

Prior to performing the following procedure, remove the Opt.Dig.out board.

1.

Press the eject button on the front side of the cassette mechanism assembly to open the cassette door.

2.

Remove the four screws L attaching the cassette mechanism assembly on the back of the assembly.

Eject button

L

K

Opt, Dig.out board

Fig.16

Cassette mechanism

L

Fig.17

1-9

UX-V10

Prior to performing the following procedure, remove the rear cover, the side panels, the cassette mechanism assembly, the main board and the front panel assembly.

M

CD mechanism cover (CD mechanism assembly)

Removing the CD mechanism assembly

(See Fig.18 to 21)

1.

Disconnect the harness from connector CN721 and CN722, and the card wire from CN766 on the LCD board on the back of the front panel assembly.

2.

Remove the five screws M attaching the CD mechanism cover to the front panel. Remove the CD mechanism cover together with the CD mechanism assembly.

3.

Release the harness from each hook on the CD mechanism cover.

4.

Remove the five screws N attaching the CD mechanism cover and the CD mechanism case. Release the three joints g of the CD mechanism cover and the CD mechanism case by pushing the joint hooks inward.

5.

Disconnect the card wire from connector CN603 and the harness from CN605 on the CD servo control board.

6.

Remove the CD mechanism assembly from the CD mechanism cover by pulling out it from the three bosses h.

M

CN766

LCD board

Joint g

Fig.18

R

Belt

Loading motor

M

CN721

CN722

NN

CD mechanism cover

Loading motor

CD mechanism case

N

Removing the LED board (A)

(See Fig.21)

1.

Remove the screw O attaching the LED board (A).

CD mechanism cover

CN603

CD servo control board

LCD board (A)

CN605

Joint g

N

Fig.19

CD mechanism case

Joint g

CD mechanism cover

Fig.20Fig.21

1-10

UX-V10

Removing the LED board (B) (See Fig.22)

Prior to performing the following procedure, remove the CD mechanism assembly.

1.

Remove the screw P attaching the LED board (B).

Removing the CD door switch board

(See Fig.22)

1.

Release the hook i fixing the CD door switch board to the CD mechanism cover.

Removing the CD servo control board

(See Fig.22)

Prior to performing the following procedure, remove the CD mechanism assembly and the LED board (A) / (B).

1.

Remove the two screws Q attaching the CD servo control board.

2.

Pull out the CD servo control board in the direction of the arrow by releasing the two joints j.

Removing the loading motor

(See Fig.18)

1.

Remove the belt and the two screws R attaching the loading motor on the back of the front panel assembly.

CD door switch board

Hook i

P

LCD board (B)

M

CN766

LCD board

Operation switch board

Q

Joint j

Fig.22

CD mechanism cover (CD mechanism assembly)

CD servo control board

R

Belt

Loading motor

M

CN721

Fig.18

CN722

S

O

LCD board (A)

Removing the LCD board assembly

(See Fig.23)

Prior to performing the following procedure, remove the CD mechanism cover (CD mechanism assembly).

1.

Remove the two screws S attaching the LCD board assembly.

2.

Disconnect connector CN781 on the LCD board assembly from the operation switch board.

Removing the operation switch board

(See Fig.24)

Prior to performing the following procedure, remove the LCD board assembly.

1.

Remove the eight screws T attaching the operation switch board.

CN781

T

LCD board assembly

Fig.23

Operation switch board

T

Fig.24

1-11

UX-V10

<<Cassette Mechanism Section>>

Removing the Playback/Recording & Eraser Head ( See Figs. 1 and 2 )

1. While shifting the trigger arms seen on the right side of the head mount in the arrow direction, turn the flywheel R in counterclockwise direction until the head mount has gone out with a click (See Fig. 1).

2. When the flywheel R is rotated in counterclockwise direction, the Playback/Recording & Eraser head will be turned in counterclockwise direction from the position in Fig. 2 to that in Fig. 3.

3. At this position, disconnect the flexible P.C. board (outgoing from the Playback/Recording & Eraser head) from the connector CN31 on the head amplifier & mechanism control P.C. board.

4. After dismounting the FPC holder, remove the flexible P.C. board.

5. Remove the flexible P.C. board from the chassis base.

6. Remove the spring Afro behind the Playback/Recording & Eraser head.

7. Loosen the reversing azimuth screw retaining the Playback /Recording & Eraser head.

8. Take out the Playback/Recording & Eraser head from the front of the head mount.

9. The Playback/Recoring & Eraser head should also be removed similarly according to Steps 1 ~ 8 above.

Frexible board

Cassette mechanism

Fig. 1

Playback/Recording & eraser hyead

Flywheel R

Trigger armHead mount

Spring "a"

Trigger arm

Reassembling the Playback/Recording & Eraser Head

1. Reassemble the playback head from the front of the head mount to the position as shown in Fig. 3.

2. Fix the reversing azimuth screw.

3. Set the spring "a" from behind the Playback/Recording & Eraser head.

4. Attach the flexible P.C. board to the chassis base, and fix it with the FPC holder as shown in Fig. 3.

5. The Playback/Recording & Eraser head should also be reassembled similarly to Step 1 ~ 4 above.

Head amplifier & mechanism control P.C. board

Fig. 2

Playback/Recording & eraser head

Spring "a"

FPC holder

Fig. 3

Flywheel R

Reversing azimuth screw

Head mount

Frexible board

Head amplifier & mechanis control P.C. board

1-12

Removing the Head amplifier & Mechanism control P.C. board (See Fig. 4)

UX-V10

Belt

1. Remove the cassette mechanism assembly.

2. After turning over th cassette mechanism assembly, remove the three screws "1" retaining the head amplifier & mechanism control P.C. board.

3. Disconnect the connector CN32 on the P.C. board including the connector CN 1 on the reel pulse P.C. board.

4. When necessary, remove the 4 pin parallel wire soldered to the main motor.

Removing the Main Motor Assembly

(See Fig. 4~6)

1. Remove the two screws "2" retaining the main motor assembly (See Fig. 4, 4a).

2. While raising the main motor, remove the capstan belt from the motor pulley (See Fig. 4a). Caution 1: Be sure to handle the capstan belt so carefully that this belt will not be stained by grease and other foreign matter. Moreover, this belt should be hanged while referring to the capstan belt hanging method in Fig. 5, 6.

Head amplifier & mechanism control P.C. board

Flexible P.C. board

Capstan belt

Fig. 4

Main motor assembly

4pin parallel wire

Main moteor assembly

Motor pulley

Capstan belt

Fig. 5

Mechanism motor assembly

Motor pulley

Fig. 4a

Main motor assembly

Flywheel

Motor pulleyCapstan belt

Fig. 6

1-13

UX-V10

Removing the Flywheel (See Figs. 7 and 8)

1. Remove the head amplifier & mechanism control P.C. board.

2. Remove the main motor assembly.

3. After turning over the cassette mechanism, remove the slit washers "b" and "c" fixing the capstan shafts R and L, and pull out the flywheel R and L respectively from behind the cassette mechanism.

Flywheel R Flywheel L

Capstan shaft R Capstan shaft L

Flywheel R Flywheel L

Fig. 8

Removing the Reel Pulse P.C. board and Solenoid

(See Fig. 9)

1. Remove the five pails "d"~"h" reataining the reel pulse P.C. board.

2. From the surface of the reel pulse P.C. board parts, remove the two pawls "i" and "j" retaining the solenoid.

j

Solenoid

Slit washer

Fig.7

Reel pulse P.C. board

1-14

Fig. 9

Main adjustment

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Measurement Instruments Required for

Adjustment

1. Low frequency oscillator This oscillator should have a capacity to output 0dBs to 600 50Hz-20kHz.

2. Attenuator impedance : 600

3. Electronic voltmeter

4. Distortion meter

5. Frequency counter

6. Wow & flutter meter

7. Test tape VTT703L : Head azimuth VT712 : Tape speed and running unevenness (3kHz) VT724 : Reference level (1kHz)

8. Blank tape TYPE TYPE

9. Torque gauge : For play and back tension FWD(TW2111A), REV(TW2121a) and FF/REW(TW2231A)

10. Test disc: CTS-1000

Measurement conditions

Power supply voltage : AC230V (50Hz)----B/E/EE/EN : AC110/127V/230V(50/60Hz) : UB/UF/US/UX/U Reference output : Speaker : 0.775V/4 : Headphone : 0.077V/32 Reference frequency and input level ------------------------------ 1kHz, AUX : -8dBs MIX MIC: -54dBs (UB/UF/US/UX/U) Input for confirming recording and playback characteristics ------------------------- AUX : -28dBs Measurement output terminal ------- at Speaker J3002

Load resistance --------------------------- 4

Radio Input signal

AM frequency --------------------------------------- 400Hz AM modulation ---------------------------------------- 30% FM frequency --------------------------------------- 400Hz FM frequency deviation ------------------------ 22.5kHz

at an oscillation frequency of

: AC-225 : AC-514

Tuner section

B/E/EN version FM Band cover: 87.5 MW Band cover: 522 LW Band cover: 144 EE version FM Band cover: 65 MW Band cover: 522 LW Band cover: 144 UB/UF/US/UX/U version FM Band cover: 87.5 MW Band cover: 531 SW Band cover: SW1 2.3 : SW2 7 Voltage applied to tuner +B : DC5.7V VT : DC 12V Reference measurement output 26.1mV(0.28V)/3 Input positions AM : Standard loop antenna FM : TP1 (hot) and TP2 (GND)

Standard measurement position of volume

Function switch to Tape Beat cut switch to Cut Super Bass/Active hyper Bass to OFF Bass Treble to Center Adjustment of main volume to reference output VOL : 28

Precautions for measurement

1. Apply 30pF and 33k side and 0.082 sweeper input side.

2. The IF sweeper output level should be made as low as possible within the adjustable range.

3. Since the IF sweeper is a fixed device, there is no need to adjust this sweeper.

4. Since a ceramic oscillator is used, there is no need to perform any MIX adjustment.

5. Since a fixed coil is used, there is no need to adjust the FM tracking.

6. The input and output earth systems are separated. In case of simultaneously measuring the voltage in both of the input and output systems with an electronic voltmeter for two channels, therefore, the earth should be connected particularly carefully.

7. In the case of BTL connection amp., the minus terminal of speaker is not for earthing. Therefore, be sure not to connect any other earth terminal to this terminal. This system is of an BTL system.

8. For connecting a dummy resistor when measuring the output, use the wire with a greater code size.

9. Whenever any mixed tape is used, use the band pass filter (DV-12).

F and 100k in series to the

108MHz 1,629kHz 288kHz

74MHz, 87.5 108MHz

1,629kHz 288kHz

108MHz 1,602kHz, 530 1,710kHz

6.995MHz

21.85MHz

to the IF sweeper output

1-15

UX-V10

<<

Arrangement of Adjusting Position

>>

Cassette mechanism section

Head azimuth adjusting screw (Forward side)

Head azimuth adjusting screw (Reverse side)

Cassette mechanism section (Back side)

Head azimuth adjusting screw (Forward side)

Playback/Recording & eraser head

Head azimuth adjusting screw (Reverse side)

Front panel assembly section

VR201 R ch BIAS ADJ

VR101 L ch BIAS ADJ

L301

MOTOR SPEED VR301

1-16

Tape Recorder Section

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Items

Confirmation of head angle

Measurement conditions

Test tape : VTT703L (8kHz) Measurement output terminal : Speaker terminal Speaker R (Load resistance: 4 ) : Headphone terminal

Measurement method

1 Playback the test tape VTT703L (8kHz) 2 With the recording & playback mechanism, adjust the head azimuth screw so that the forward and reverse output levels become maximum. After adjustment, lock the head azimuth at least by half turn. 3 In either case, this adjustment should be performed in both the forward and reverse directions with the head azimuth screw.

Confirmation of tape speed

Test tape : VT712 (3kHz) Measurement output terminal : Headphone terminal

Adjust VR37 so that the frequency counter reading becomes 2,940~3,090Hz when playing back the test tape VT712 (3kHz) with playback and recording mechanism after ending forward winding of the tape.

Reference Values for Confirmation Items

Standard Values

Maximum output

Tape speed of deck : 2,940 ~ 3,090Hz

Adjusting positions

Adjust the head azimuth screw only when the head has been changed.

VR301

Items

Difference between the forward and reverse speed

Measurement conditions

Test tape : VT712 (3kHz) Measurement output terminal : Speaker terminal Speaker R (Load resistance: 4 ) Measurement output terminal : Headphone

Wow & flutter Test tape

: VT712 (3kHz) Measurement output terminal : Headphone terminal

Measurement method

Standard Values

When the test tape VT712 (3kHz) has been played back with the recording and playback mechanism at the beginning of forward winding, the frequency counter reading of the difference between both of the mechanism should be 6.0Hz or less.

When the test tape VT712 (3kHz) has been played back with the recording and playback mechanism at the beginning of forward winding, the frequency counter reading of wow & flutter should be 0.25% or less (WRMS).

6.0Hz or less

0.25% or less (WRMS)

Adjusting positions

Head azimuth screw

1-17

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Electrical Performance

Items

Adjustment of recording bias current (Reference Value)

Adjustment of recording and playback frequency characteristics

Measurement conditions

Mode: Forward or

reverse mode

Recording mode

Test tape : AC-514 to TYPE and AC-225 to TYPE Measurement output terminal : Both recording and headphone terminals

Reference frequency : 1kHz and 10kHz (REF.: -20dB) Test tape : AC-514 to TYPE Measurement input terminal : OSC IN

Measurement method

Standard Values

1 With the recording and playback mechanism, load the test tapes (AC-514 to TYPE

and AC-225 to TYPE ), and set the mechanism to the recording and pausing condition in advance. 2 After connecting 100

in series to the recorder head, measure the bias current with a valve voltmeter at both of the terminals. 3 After resetting the [PAUSE] mode, start recording. At this time, adjust VR31 for Lch and VR32 for Rch so that the recording bias current values become 4.0

) and 4.20 A (TYPE ).

A (TYPE

1 With the recording and playback mechanism, load the test tapes (AC-514 to TYPE

), and set the mechanism to the recording and pausing condition in advance. 2 While repetitively inputting the reference frequency signal of 1kHz and 10kHz from OSC IN, record and playback the rape. 3 While recording and playback the test tape in TYPE

, adjust VR31 for Lch and VR32 for Rch so that the output deviation between 1kHz and 10kHz becomes

-1dB

2dB.

AC-225 : 4.20 AC-514 : 4.0

Output deviation between 1kHz and 10kHz : -1dB

Adjusting positions

L ch : VR101

A

R ch : VR201

A

L ch : VR101 R ch : VR201

2dB

Reference Values for Electrical Function Confirmation Items

Items

Recording bias frequency

Measurement conditions

Forward or reverse

Test tape

: TYPE

(AC-514)

Measurement terminal : BIAS TP on P.C. board

Measurement method

1 While changing over to and from BIAS 1 and 2, confirm that the frequency is changed. 2 With the recording and playback mechanism, load the test tape. (AC-514 to TYPE

), and set the mechanism to the recording and pausing condition in advance. 3 Confirm that the BIAS TP frequency on the P.C. board is 100kHz

Eraser current (Reference value)

Forward or reverse

Recording mode

Test tape : AC-514 to TYPE and AC-225 to TYPE Measurement terminal : Both of the eraser head terminals

1 While recording and playback mechanism, load the test tapes (AC-514 to TYPE and AC-225 to TYPE ), and set the mechanism to the recording and pausing conditions in advance. 2 After setting to the recording conditions, connect 1W in series to the eraser head on the recording and playback mechanism side, and measure the eraser current from both of the eraser terminals.

6kHz.

Standard Values

100 kHz

6 kHz

TYPE : 120 mA TYPE : 75 mA

Adjusting positions

1-18

Flow of functional operation until TOC read

Power ON

Power Key

Slider turns REST SW ON.

Automatic tuning of TE offset

Check that the voltage at the pin17 of CN604 is 0V (a moment)?

UX-V10

Check Point

VREF

Tracking error waveform at TOC reading

pin 25 of IC601(TE)

Approx

1.8V

Tracking servo

Disc statas to rotate

off statas

Automatic measurement of TE amplitude and automatic tuning of TE balance

Approx.3sec

Tracking servo on statas

Disc to be braked to stop

TOC reading finishes

500mv/div 2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of Foucus offset

Automatic measurement of Focus A-curve amplitude

Disc is rotated

Focus servo ON (Tracking servo ON)

Automatic measurement of Tracking error amplitude

Automatic tuning of Tracking error balance

Check that the voltage at the pin3 of IC601 + side is + 5V?

Confirm that the Focus error S-cuve siganl at the pin27 of IC601 is approx.2Vp-p

Confirm that the siganl from pin24 IC603 is 0V as a accelerated pulse during approx.400ms.

Confirm the waveform of the Tracking error signal at the pin25 of IC601 (R612) (See fig-1)

Automatic tuning of Focus error balance

Automatic tuning of Focus error gain

Automatic tuning of Tracking error gain

TOC reading

Play a disc

Confirm the eys-pattern at the lead of TP1

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UX-V10

Maintenance of laser pickup

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

(2) Life of the laser diode (Fig.1) When the life of the laser diode has expired, the following symptoms wil appear. (1) The level of RF output (EFM output:ampli tude of eye pattern) will below.

Is RF output

1.1 0.15Vp-p?

YES

O.K

NO

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.

(Fig.1)

(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.

Check the eye-pattern at TP1.

Finish.

1-20

Description of major ICs

LA6541-X(IC541) : Servo Driver

1. Pin Layout & Block Diagram

UX-V10

Vcc Vref Vin4 Vg4 Vo8 Vo7

24 23

22

21

20

19

11k

Vcc

Gnd

Vo6 Vo5 Vg3 Vin3 Cd Res

18

17 16

ohm

- +

Level shift

B T L driver

Level shift

11k ohm

1

2

Vcc Mute Vin1 Vg1 Vo1 Vo2 Vo3 Vo4 Vg2 Vin2 Reg

3456

Gnd

7 8 9101112

2. Pin functions

Symbol Function

No.

1

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

2 3 4 5 6 7 8 9

Vcc

Mute

Vin1

Vg1 Vo1 Vo2 Vo3 Vo4 Vg2

Vin2

Reg Out

Reg In

Res

Cd

Vin3

Vg3 Vo5 Vo6 Vo7 Vo8 Vg4

Vin4

Vref Vcc

Power supply (Shorted to pin 24) All BTL amplifier outputs ON/OFF BTL AMP 1 input pin BTL AMP 1 input pin (For gain adjustment) BTL AMP 1 input pin (Non inverting side) BTL AMP 1 input pin (Inverting side) BTL AMP 2 input pin (Inverting side) BTL AMP 2 input pin (Non inverting side) BTL AMP 2 input pin (For gain adjustment) BTL AMP 2 input pin External transistor collector (PNP) connection. 5V power supply output External transistor (PNP) base connection Reset output Reset output delay time setting (Capacitor connected externally) BTL AMP 3 input pin BTL AMP 3 input pin (For gain adjustment) BTL AMP 3 output pin (Non inverting side) BTL AMP 3 output pin (Inverting side) BTL AMP 4 output pin (Inverting side) BTL AMP 4 output pin (Non inverting side) BTL AMP 4 output pin (For gain adjustment) BTL AMP 4 output pin Level shift circuit's reference voltage application Power supply (Shorted to pin 1)

15

14

13

11k ohm

RESET

Regulator

11k ohm

Reg

out

In

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