JVC UXH-100 Service manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

MB24820047

UX-H100

Area suffix

A ------------------------ Australia US ------------------------ Singapore UT ---------------------------- Taiwan UW ----------- Brazil,Mexico,Peru UJ ---------------------- U.S.Military

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

No.MB248

2004/7

SPECIFICATION

Amplifier Section-CA-UXH100 Output Power 10 W per channel, min. RMS, driven into 6 Ω at 1 kHz,

with no more than 10% total harmonic distortion (IEC 268-3)

Speakers/Impedance 6 Ω - 16 Ω

Tuner FM tuning range FM 100 kHz intervals 87.5 MHz-108.0 MHz

FM 50 kHz intervals 87.50 MHz-108.00 MHz

AM tuning range AM 10 kHz intervals 530 kHz-1 710 kHz

AM 9 kHz intervals: 531 kHz-1 710 kHz

CD player Dynamic range 85 dB

Signal-to-noise ratio 85 dB

Wow and flutter Immeasurable

Cassette deck Frequency response Normal (type I) 100 Hz-10 000 Hz

Wow and flutter 0.35 % (WRMS)

General Power requirement AC 110V-127V/220V-240 V , adjustable with the voltage

selector, 50 Hz/60 Hz

Power consumption 38 W (at operation) 2 W (on standby)

Dimensions (W/H/D) (approx.) 144 mm × 255 mm × 277 mm

Mass (approx.) 2.9 kg

Speaker Section-SP-UXH100 Type Full range Bass-reflex type

Speakers 10 cm cone × 1

Power handling capacity 10 W

Impedance 6 Ω

Frequency range 100 Hz to 15 kHz

Dimensions (W/H/D) (approx.) 130 mm × 257 mm × 151 mm

Mass (approx.) 1.5 kg each

Design and specifications are subject to change without notice.

1-2 (No.MB248)

SECTION 1

PRECAUTION

1.1 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 manufacturers 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 reassembling.

(5) Leakage shock hazard testing

After reassembling 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, 1,000Ω per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an ex-

posed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC

voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure 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.).

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

0.15 F AC TYPE

Place this probe on

1500 10W

Good earth ground

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.

1.3 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.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)

each exposed metal part.

(No.MB248)1-3

1.5 Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.5.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron palate

(3) Handling the optical pickup

• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

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

1.6 Handling the traverse unit (optical pickup)

(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the

replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a

time when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7 Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the pickup unit.

• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.

CD changer

unit

1-4 (No.MB248)

Flexible cable

Soldering

1.8 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 CD,MD and DVD player uses invisible

laser radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are defeated. It is

dangerous to defeat the safety switches.

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 here in may result in

hazardous radiation exposure.

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

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CAUTION : Visible and Invisible

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

CLASS 1 LASER PRODUCT

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

(No.MB248)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB248)

SECTION 3

DISASSEMBLY

3.1 Disassembly of the main blocks of the set

3.1.1 Replacing the fuses (See Fig.1)

• Prior to performing the following procedure, remove the rear

cover. (1) Replace the fuses inside.

Caution:

Be sure to use fuses with the specified ratings.

3.1.2 Replacing the power IC (See Fig.2)

• Prior to performing the following procedure, remove the rear

cover. (1) Remove the two screws A from the heat sink between the

power IC.

(2) Remove the solder fixing the power IC.

Fuse (F901) 800MAL 250V

Fuse (F902) T315MAL 250V

Fig.1

Fig.2

(No.MB248)1-7

3.1.3 Removing the rear cover

(See Fig.3 and 4)

(1) Remove the seven screws C that retain the rear cover from

the back of the body.

(2) Remove the eight screws D that retain the rear cover from

the two sides of the body.

(3) Remove the rear cover from the body by pulling it toward

the back.

Caution:

The FM terminal wire (inside) must be pulled out, while removing the rear cover.

Rear cove

Fig.3

Fig.4

1-8 (No.MB248)

3.1.4 Removing the CD chassis assembly (See Fig.5 to 8)

• Prior to performing the following procedures, remove the rear

cover. (1) Remove a screw E retaining the main board onto the CD

chassis.

(2) Disconnect the two FFC cables X1, X2 from the connectors

, CN703 on the CD board.

CN704

(3) Disengage the claws F on both sides of the body, while

moving the CD chassis assembly downward and backward.

(4) Before you take away the CD chassis assembly, you must

disconnect the wire from the connector CN204 board. (Fig.8)

Caution:

You must ensure that the two claws of the CD chassis's top G are disengaged, while moving the CD chassis assembly.

on the main

Fig.7

Cassette mechanism

Fig.5

Fig.8

Fig.6

(No.MB248)1-9

3.1.5 Removing the CD mechanism

(See Fig.9 to 13)

• Prior to performing the following procedures, remove the rear cover.

• Also remove the CD chassis assembly. (1) Remove the three screws Y1 retaining the CD board. (2) Disconnect the FFC cable Y2 from the connector CN701 (3) Disconnect the two parallel wires Y3 from the connector. (4) Remove the four screws Y4 with washers retaining the CD

mechanism.

Fig.12

Fig.9

1-10 (No.MB248)

Fig.10

Fig.11

Fig.13

3.1.6 Removing the bottom base assembly (See Fig.14 to 18)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

(1) Remove the two screws H retaining the front panel assem-

bly. (2) Disengage the wire Q that fix the cassette deck wire. (3) Disconnect the cassette head wire Z1 and the cassette mo-

tor wire Z2 of power supply from the connectors CN202

CN203, and then disconnect the AUX IN connecting wire

Z3 from the connector TP1 (4) Disengage the claws I on both sides of the front cabinet as-

sembly and then move the bottom base assembly toward

the back.

Caution:

You must ensure that the 30 pin connector CN201 nected (See Fig.15).

is discon-

Fig.16

Front panel

Circuit board

CN201

Fig.14

Fig.15

Fig.17

Fig.18

(No.MB248)1-11

3.1.7 Removing the main board (See Fig.19 and 20)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

• Also remove the bottom base assembly.

(1) Disengage the wire M and then disconnect the parallel wire

from the connectors CN902

(2) Removing the screw N retaining the main board onto the

bottom base.

(See Fig.20).

Main board

Bottom base

Fig.19

3.1.8 Replacing the 3-pin regulator (See Fig.21)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

• Also remove the main board assembly.

(1) Remove the two screws P retaining 3-pin regulator. (2) Remove the solder fixing the 3-pin regulator Q216

, .

Fig.20

Fig.21

1-12 (No.MB248)

3.1.9 Removing the cassette deck mechanism

(See Fig.22 and 23)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

• Also remove the bottom base assembly.

(1) Remove the four screws J retaining the cassette deck

mechanism from the back of the front cabinet assembly.

Caution:

You must press the eject key before you remove the cassette deck mechanism.

Fig.22

Fig.23

(No.MB248)1-13

3.1.10 Removing the display/control board assembly

(See Fig.24 and 25)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

(1) Remove the eleven screws K retaining the display/control

board assembly from the back of the front cabinet assembly.

Caution:

The display/control board may be taken out when the volume knob has been taken away.

Fig.24

Front panel assembl

1-14 (No.MB248)

Volume knob

Fig.25

3.1.11 Removing the cassette deck main motor, and replacing the main belt

(See Fig.26 and 27)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

• Also remove the bottom base assembly.

(1) Remove the four screws J retaining the cassette deck

mechanism. (See Fig.22) (2) Remove the cassette deck mechanism. (3) Remove the two screws L retaining the main motor from

the back side of the cassette deck and the top side of the

cassette deck.

Caution:

After attaching the main motor, check the orientation of the motor and the polarity of the wires.

(4) Form the backside of the cassette deck, remove the main

motor and the main belt.

Fig.26

3.1.12 Removing the cassette deck head (See Fig.28)

• Prior to performing the following procedures, remove the rear

cover.

• Also remove the CD chassis assembly.

• Also remove the bottom base assembly.

(1) Remove the four screws J that retain the cassette deck

mechanism. (See Fig.22)

(2) Remove the cassette deck mechanism and place it so that

the front side faces up.

(3) Remove the solder from the bottom side of the head termi-

nal and disconnect the wire. (4) Remove the screw U that retains the head. (5) Remove the screw W that retains the head. (6) Hold the head and slide it in the direction of the arrow to re-

move it.

Fig.27

W U

Fig.28

(No.MB248)1-15

4.1 Arrangement of adjusting positions

SECTION 4

ADJUSTMENT

4.2 Tape recorder section

Items

Cassette Head Azimuth

Alignments

Recording Bias Frequency

Alignment

Measurement

Test tape : VT703 (10kHz) Measurement output terminal : Left and Right speaker output (6-ohm loaded) or Headphone Output (32-ohm loaded)

Test tape : TYPE I AC-514 Measurement

output terminal : Erase head

terminal (CN202 2 th Pin)

conditions

Cassette deck mechanism

Head azimuth screw

(Forward side)

Measurement method

1.Playback the test tape VT703 (10KHz) or equivalent.

2.Adjust the head azimuth screw to obtain maximum output and both output of L/R is in 3dB.

3.Put on the screw lock paint after alignments.

1.Insert the recording tape in deck-B.

2.Starting the recording.

3.Adjust the oscillation frequency to 82KHz+/-3KHz by core of Oscillation coil of T201.

(Front side)

REC/PB Head (Deck-B)

Head azimuth screw

(Reverse side)

Standard

values

Maximum output

82kHz+/-3kHz

Adjusting

positions

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

Use the HighImpedance Probe or Frequency counter input.

4.3 Tuner section

Items

AM Tracking Alignments

AM IFT Alignments

Note: The adjustment of CD section is not required.

1-16 (No.MB248)

Measurement

conditions

Input signal : 1629kHz

600kHz

Adjustment point : Antenna coil (T2)

Input signal : 522kHz Adjustment point : IFT (T101)

1.Set the Signal Generator signal to 1629KHz

2.Receiving the signal and the adjust the OSC

3.Change the receiving frequency to 603KHz.

4.Adjust the Antenna coil ( L102 ) obtain

1.Set the receiving frequency to 522KHz.

2.Feed the 450KHz signal to AM antenna input.

3.Adjust the IFT BlockT1 obtain to maximum

Measurement method

the feedto Loop Antenna.

coil (404) obtain the. VT is 4.7V +/-0.05V.

maximum sensitivity (Adjust the SSG output to out of AGC range.)

output. (Adjust the SSG output to out of AGC range.)

Standard

values

V.T : 4.7V+/-0.05V

Maximum sensitivity

Maximum output

Adjusting

positions

Adjust the OSC coil only when the AM coil block has been

changed.

Adjust the IFT only when the IFT block has been changed.

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

(No.MB248)1-17

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