Jvc UXH33 User Manual

22044200303

UX-H33

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-H33

MICRO COMPONENT SYSTEM

Area Suffix

B -------------------------- U.K. E ------- Continental Europe EN --------- Northern Europe

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

UX-H33

Important Safety Precautions

1.1 Safety Precautions

(1) This d esign 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 o f the design or circuitry of the p roduct 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, watt age, etc. Replacement parts which have these specia l safety characteristics are identified in the Parts List of Service Manual. Electrical components having such feat ures 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 origin al 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, headp hone 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 ohm 10W resistor paralleled by a 0.15 µF AC-type capacitor between an

SECTION 1

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 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.).

1.2 Warning

(1) This equipment has been designed and manufactured to

meet international safety standards.

(2) It is the leg al 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 a re 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 o f the same type and rating as specified by the manufacturer. (Except the JC version)

1-2 (No.22044)

1.5 Safety Precautions (U.K only)

(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-

tinued 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 unautho rised design alterations or additions will void the manufacturer' s guarantee; furthermore the manufacturer cannot

accept responsibility for 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 not e 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 original lead routing and dress should be observed, and it shoul d be confirmed that they have been returned to normal, after re-assembling.

1.5.1 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 responsib ility 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.

UX-H33

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.

(No.22044)1-3

UX-H33

1.6 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.

1.6.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser dio de) in devices such as CD players. 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 sh eet) 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.

(3) Ha ndling the optical pickup

• In order to maintain quality during transport and before instal lation, both sides of the laser di ode on the replacement optica l 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.

1.7 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, r ef er to the replace-

ment procedure in the text. Remove the anti-static pin when replacing th e 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) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.8 Attention when traverse unit is decomposed *Please refer to "Disassembly method" in the text for the CD pickup unit.

• Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the CD servo board. (If the flexible wire is disconnected without applying solder, the CD 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.

Shorting round

1-4 (No.22044)

Flexible wire

Shorting round

CN601 on mechanism board

1.9 Important for laser products

(1) CLASS 1 LASER PRODUCT (2) DANGER : Invisi ble 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 p layer 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 de feated. It is dangerous to defeat the safety switches.

UX-H33

(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 d irectly or touch it in case of anadjustment or operation check.

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.

REPRODUCTION AND POSITION OF LABELS

ADVARSEL

Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsasttelse for stråling.

ADVARSEL

Usynlig laserstråling ved åpning, når sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

Caution label

(No.22044)1-5

UX-H33

2.1 Main body

2.1.1 Removing the rear panel

(See Fig.1,2)

(1) From behi nd the body, remove the eight screws A attach-

ing the rear panel.

(2) Turing the body upside down, remove the two screws B at-

taching the rear panel, and remove.

SECTION 2

Disassembly method

Fig.1

Rear panel

Front panel assembly

Fig.2

1-6 (No.22044)

2.1.2 Removning the side pane l (L) and (R) (See Fig.2~5)

• Prior to performing the following procedure, remove the rear

panel. (1) Turning the body upside down, remove the two screws C

attaching the front panel assembly.

(2) Turn ing the body initial position, open the CD door while

pressing the upper OPEN button.

(3) Moving the side panel (L) in the arrow direction, remove the

panel from the left side of the body.

(4) Mov ing the side panel (R) in the arrow direction, remove

the panel from the right side of the body.

UX-H33

Side panel (L)

Fig.3

Fig.4

Side panel (R)

Fig.5

(No.22044)1-7

UX-H33

2.1.3 Removing the CD player assembly (See Fig.6,7)

• Prior to performing the following procedure, remo ve the rear

panel and the left and right side panels. (1) Disconnect the card wires from the two connectors CN603

and CN604 on the CD servo control board.

(2) Remove the two screws D attaching the front panel assem-

bly on the both sides.

(3) Release the two joints a on the both sides of the front panel

assembly.

(4) Move the CD player assembly in the direction of the arrow .

CD player assembly

CD servo control board

CN604

CN603

Fig.6

CD player assembly

Fig.7

1-8 (No.22044)

2.1.4 Removing the power amplifier board and he at sin k

(See Fig.8~10)

• Prior to performing the following procedure, remove the rear

panel, the left and right side panels, and the CD player assembly. (1) Remove the five screws E and F attaching the heat sink. (2) Disconn ect the wire from connector CN901 on the power

supply board.

(3) Disconnect the card wire from connector CN305 on the

power amplifier board. (4) Remove the screw G attaching the power amplifier board. (5) Disconn ect the connector CN301 on the power amplifier

board, and release the two joints b.

REFERENCE:

Remove the screw F, then power amplifier board can be removed without removing heat sink.

Heat sink

UX-H33

Power amplifier board

CN301

Fig.8

Power supply board

CN901

Fig.9

Power amplifier board

Fig.10

CN305

(No.22044)1-9

UX-H33

2.1.5 Removing the tuner board (See Fig.11)

• Prior to performing the following procedure, remo ve the rear

panel, the left and right side panels, and the CD player assembly. (1) Remove the screw H attaching the tuner board from the

right side of the body.

(2) Disconne ct the card wire from the connector CN1 on the

tuner board.

(3) Release the joint c, and remove the tuner board backward.

2.1.6 Removing the front panel assembly (See Fig.12,13)

• Prior to performing the following procedure, remo ve the rear

panel the left and right side panels, the CD player assembly, the power amplifier board. (1) Disconnect the card wire from the connector CN714 on the

LCD system CPU board.

(2) Release the joint d on the bottom of the front panel assem-

bly using a screwdriver, and remove the front panel assembly toward the front.

CN1

Tuner board

Fig.11

Front panel assembly

LCD system CPU board

CN714

Fig.12

Fig.13

1-10 (No.22044)

2.1.7 Remove the power transformer an d power supply board

(See Fig.14,15)

• Prior to performing the following procedure, remove the rear

panel, the left and right side panels, the CD player assembly, the power amplifier board and the tuner board. (1) Remove the screw I attaching the jack holder and release

joint e, and then remove jack holder.

(2) Remove the four screws J attaching the power transformer

and power supply board.

UX-H33

Jack holder

Fig.14

Power supply board

Fig.15

Power transformer

(No.22044)1-11

UX-H33

2.1.8 Remove the cassette mechanism assembly (See Fig.16,17)

• Prior to performing the following procedure, remove the front

panel assembly. (1) Disconnect the card wire from the connector CN713 on the

LCD system CPU board.

(2) Remove the four screws K and L attaching the cassette

mechanism assembly, and remove.

Front panel assembly

CN713

LCD system CPU board

Fig.16

1-12 (No.22044)

Cassette mechanism assembly

Fig.17

2.1.9 Remove the LCD system CPU board

(See Fig.18)

(1) Disconnect the wire from the connector CN716 on the LCD

system CPU board.

(2) Rele ase the two joints f and pull out the LCD system CPU

board.

UX-H33

CN716

2.1.10 Removing the operating switch board

(See Fig.19,20)

• Prior to performing the following procedure, remove the front

panel assembly, the cassette mechanism assembly and the LCD system CPU board. (1) Remove th e two screws M attaching the operating switch

button.

(2) Remove the tw o screws N attaching the operating switch

board, and remove.

Operating switch button

LCD system CPU board

Fig.18

Operating switch board

Fig.20

Fig.19

(No.22044)1-13

UX-H33

2.2 Cassette mechanism assembly

2.2.1 Removing the Play/Record & Clear head (See Fig.1~3)

(1) While moving the trigger arm o n the right side of the head

mount in the direction of the arrow, turn the flywheel R counterclockwise until the head mount comes ahead and clicks.

(2) The head turns counterclockwise a s you turn the fl ywheel

R counterclockwise (See Fig.2 and 3).

(3) Di sconnect the flexible wire from connector CN31 on the

head amplifier & mechanism control board. (4) Re mo v e the spring from the back of the head. (5) Loosen the azimuth screw for reversing attaching the head. (6) Remove the head on the front side of the head mount.

Cassette mechanism assembly

Fig.1

Head

Fly wheelR

Trigger armHead mount

Flexible wire

Fly wheel R

Fig.2

Azimuth screw

Head

for reversing

Spring

CN31

Head amplifer & mecha control board

Fig.3

1-14 (No.22044)

2.2.2 Removing the head amplifier & mechanism control board (See Fig.4)

(1) Turn over the cassette mechanism assembly and remove

the three screws A attaching the head amplifier & mechanism control board.

(2) Disconn ect the flexible wire from connector CN31 on the

head amplifier & mechanism control board.

(3) Disconnect connector CN32 of the head amplifier & mech-

anism control board from connector CN1 on the reel pulse board.

REFERENCE:

If necessary, unsolder the 4-pin wire soldered to the main motor.

Head amplifier & mecha control board

CN32

UX-H33

4pin wire

2.2.3 Removing the main motor (See Fig.4~7)

(1) Remove the two screws B. (2) Half raise the motor and remove the capstan belt from the

motor pulley.

ATTENTION:

Be careful to keep the capstan belt from grease. When reassembling, refer to Fig.6 and 7 for attaching the capstan belt.

Main motor assembly

Capstan belt

CN31

Flexible wire

Main motor assembly

Fig.4

Main motor assembly

Motor pulley

Fig.5

Capstan belt

Fig.6

Main motor assembly

Fly wheel

Motor pulley

Fig.7

(No.22044)1-15

UX-H33

2.2.4 Removing the flywheel (See Fig.8, 9)

• Prior to performing the following procedure, remove the head

amplifier & mechanism control board and the main motor assembly. (1) From the front side of the cassette mechanism, remove the

slit washers attaching the capstan shaft L and R. Pull out the flywheels backward.

Fly wheel R Fly wheel L

Fig.8

2.2.5 Removing the reel pulse board and solenoid (See Fig.10)

• Prior to performing the following procedure, remove the head

amplifier & mechanism control board. (1) Remove the screw C. (2) Re lease the tab a, b, c, d and e reta ining the reel pulse

board.

(3) Re lease the ta b f and g attaching the so lenoid on the reel

pulse board.

(4) The reel pulse board and the solenoid come off.

Solenoid

Fly wheel R

Capstan shaft R Capstan shaft L

Slit washer

Fig.9

Reel pulse board

Fly wheel L

1-16 (No.22044)

Fig.10

2.2.6 Reattaching the Play/ Record & Clear head

(See Fig.11~13)

(1) Reattaching the head mount assembly.

a) Change front of the direction cover of the head mount

assembly to the left (Turn the head forward).

b) Fit the bosses O', P', Q', U' and V' on the head mount

assembly to the holes P and V, the slots O, U and Q of the mechanism sub assembly (See Fig.11 to 13).

CAUTION:

To remove the head mount assembly, turn the direction cover to the left to disengage the gear. If the gear can not be disengaged easily, push up the boss Q' slightly and raise the rear side of the head mounts slightly to return the direction lever to the

reversing side. (2) Tig hten the azimuth screw for reversing. (3) Reattach the spring from the back of the Play / Record &

Clear head.

(4) Connect the flexible wire to connector CN31 on the head

amplifier & mechanism control board.

U' Q'

Head mount assembly

Fig.11

Direction cove

UX-H33

Head

Spring

Flexible wire

Fig.12

Azimuth screw for reversing

Direction cove

Head mount

CN31

Fig.13

Head amplifier &

mechanism control board

(No.22044)1-17

UX-H33

3.1 Adjustment method

SECTION 3

Adjustment

Measurement Instruments Required for Adjustment

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

2. Attenuator impedance : 600

3. Electronic voltmeter

4. Distortion meter

5. Frequency counter

6. Wow & flutter meter

7. Test tape VT703L : Head azimuth VT712 : Tape speed and running unevenness (3kHz) VT724 : Reference level (1kHz)

8. Blank tape TYPE : AC-225 TYPE : AC-514

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

AC 230V ~ , 50Hz Reference output : Speaker : 0.775V/4 : Headphone : 0.077V/32 Reference frequency and input level ------------------------------ 1kHz, AUX : -8dBs 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

Tuner section

FM tuning range: 87.5MHz~108.00MHz AM tuning range: 522kHz~1,629kHz

Voltage applied to tuner +B : DC5.7V VT : DC 12 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 to the IF sweeper output side and 0.082 F and 100k in series to the 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).

1-18 (No.22044)

3.2 Cassette mechanism adjustment

UX-H33

Head azinuth adjustment screw (Forward side)

Mecha control board

Head azinuth adjustment screw (Reverse side)

SW1

SW2

Head azinuth adjustment screw (Forward side)

Head azinuth adjustment screw (Reverse side)

CN31

R/P head, Erase head

VR37

R371

CN1

FW100

SW5

Motor speed VR37

BIAS adjust

VR31

C308

R327

VR31

R313

Q302

R315

C316

C319

C221

R314

L301

C121

C314

C313

R104

Q305

D340

C310

R304

R310

C107

L303

R102

R121

R221

R303

R335

R353

R339

R108

C113

R302

Q343

C103

C207

R301

C301

Q342

C304

R208

C105 C205

C106

R306

R106

R101

C104

CN34

C306

Q344

R105

C102

R344

R205

R110

Q345

R345

C307

R336

C340

R346

R206

C206

R107

W1 Q346

R305

C110

R210

C300

C341

R109

R372

Q372

C371

CN33

IC32

R116

C109

CN31

Q371

C101

C374

R216

Q375

R376

C376

R204

R201

C202

C204

C201

CN32

C203

R202

C210

R340

C331

R342

R347

Q347

SW6

R343

R341

IC33

IC1

D375

Q376

R338

R375

R337

C213

C342

C209

R207

(No.22044)1-19

UX-H33

3.2.1 Mechanism section

Item Condition Measurement method Ref.value

Head azimuth

Test tape : VT703L (8kHz) Output terminal : Speaker out

1.Playback the test tape VT703L (8kHz).

2.Adjust to maximum output level by azimuth adjustment screw for forward side and reverse side.

Maximum output

3.This adjustment is adjust by adjustment screw of forward side and adjustment screw of reverse side.

Tape speed

Test tap : VT712 (3kHz) Output terminal

Playback the test tape VT712 (3kHz) at end of forward side,adjust to 2,940~3,90Hz indication of frequency counter by VR37.

2,940 ~ 3,090Hz

: Speaker out or Headphone out

Adjustment

position

Only adjust at changed head

VR37

Item Condition Measurement method Ref.value

Tape speed diviation at FWD/REV

Test tape : VT712 (3kHz) Output terminal

Playback the test tape VT712 (3kHz) at end of forward and reverse, tape speed deviation should be less than 6.0Hz.

Leass than

6.0Hz

: Speaker out or Headphone out

Wow & Flutter Playback the test tape VT712 (3kHz) at

Test tape : VT712 (3kHz) Output terminal

start of forward and reverse,Wow & Flutter are should be less than 0.25%(WRMS).

Less than

0.25% (WRMS)

: Speaker out or Headphone out

Adjustment

position

VR31

1-20 (No.22044)

3.2.2 Electrical adjustment

UX-H33

Item Condition Measurement method Ref.value

Recording BIAS adjustment

Forward or Reverse Test tape :AC-514 TYPE :AC-225 TYPE Output terminal Recording head

1.Set the test tape(AC-514 TYPE and AC-225 TYPE ), then make REC/PAUSE condition.

2.Connect 100 to recording head by series, then connect to VTVM for measurement the current.

AC-225 :4.20 A AC-514 :4.0 A

3.After setting, start the recording by release the PAUSE, in this time bias current adjust to next fig. by VR31 for Lch and VR32 for Rch.

4.0 A (TYPE ) and 4.20 A (TYPE ).

R/P playback frequency response

Reference frequency : 1kHz / 10kHz (Reference: -20dB) Test tape : AC-514 TYPE Input terminal : OSC IN

1.Set the test tape (AC-514 TYPE ), then make REC/PAUSE condition.

2.Release the PAUSE, then start recording the 1kHz and 10kHz of reference frequency from oscillator.

3.Playback the recorded position, 1kHz and 10kHz output deviation should -1dB 2dB

Output deviation 1kHz/10kHz :-1dB 2dB

to readjust by VR31 for Lch and VR32 for Rch.

Adjustment

position

VR31

3.2.3 Electrical response confirmation

Item Condition Measurement method Ref.value

Recording bias current

Forward or Reverse Test tape : TYPE (AC-514) Measurement terminal : BIAS test point on printed circuit board

Erase current (reference value)

Forward or Reverse Rec condition Test tape : AC-514 TYPE : AC-225 TYPE Measurement terminal : Both side of Erase head

1.Change BIAS1 and 2, confirm the frequency should be change.

2.Set the test tape (AC-514 TYPE ), then make REC/PAUSE condition.

3.Confirm the frequency should 100Hz 6kHz at BIAS test point on printed circuit board.

1.Set the test tape (AC-514 TYPE and AC-225 TYPE ), then make REC/PAUSE condition.

2.Release the PAUSE to REC condition, connect 1W to ERASE head by series, then confirm the erase current at both side of erase head.

Adjustment

position 100 kHz 6 kHz

TYPE : 120 mA TYPE : 75 mA

(No.22044)1-21

UX-H33

3.3 Flow of functional operation until TOC read (CD)

Power ON

Power Key

Slider turns REST SW ON.

Automatic tuning of TE offset

Check Point

Check that the voltage at the pin4 of CN601 is 0V (a moment)?

VREF

Tracking error waveform at TOC reading

pin 20 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 pin2 of IC601 is 0V?

Confirm that the Focus error S-cuve siganl at the pin23 of IC601 is approx.2Vp-p

Confirm that the siganl from pin22 IC603 is 0V as a accelerated pulse during approx.400ms.

Confirm the waveform of the Tracking error signal at the pin20 of IC601 (See fig-1)

1-22 (No.22044)

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

UX-H33

3.4 Maintenance of laser pickup (CD)

(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.

• The level of RF output (EFM output : amplitude of eye pattern) will below.

Is the level of

RFOUT under

Replace it.

1.25V 0.22Vp-p?

YES

O.K

(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.

3.5 Replacement of laser pickup (CD)

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.

(No.22044)1-23

UX-H33

4.1 AN22000A-W (IC601) : RF & SERVO AMP

• Terminal layout

12345678910111213141516

• Block diagram

SECTION 4

Description of major ICs

17181920212223242526272829303132

OFTR

COFTR

BDO

BCDO

ARF

CAGC

RFIN

RFOUT

RFN

13 14

8 7

CEA

BDO OFTR

AGC

RF_EQ

NRFDET3TOUT

3TENVNRFDET

FEN

GCA BCA

AMP

FEOUT

SUBT

TEN

GCA BCA

AMP

SUBT

GCA BCA

AMP

VDET

GCA BCA

AMP

PDLDVDETTEBPFTEOUT

16252624

GCTL TBAL FBAL GND VCC

1-24 (No.22044)

VREF

• Pin function Pin

Symbol I/O Function

No.

1 PD I APC Amp. input terminal 2 LD O APC Amp. output terminal 3 VCC - Power supply terminal 4 RFN I RF adder Amp. inverting input terminal 5 RFOUT O RF adder Amp. output terminal 6 RFIN I AGC input terminal 7 CAGC I Input terminal for AGC loop filter capacitor 8 ARF O AGC output terminal 9 CEA I Capacitor connecting terminal for HPF-

Amp. 10 3TOUT O 3 TENV output terminal 11 CBDO I Capacitor connecting terminal for envelope

detection on the darkness side 12 BDO O BDO output terminal 13 COFTR I Capacitor connecting terminal for envelope

detection on the light side 14 OFTR O OFTR output terminal 15 NRFDET O NRFDET output terminal

Symbol I/O Function

No.

16 GND - Ground 17 VREF O VREF output terminal 18 VDET O VDET output terminal 19 TEBPF I VDET output terminal 20 TEOUT O TE Amp. output terminal 21 TEN I TE Amp. inverting input terminal 22 FEN I FE Amp. inverting input terminal 23 FEOUT O FE Amp. output terminal 24 GCTL O GCTL & APC terminal 25 FBAL O FBAL control terminal 26 TBAL O TBAL control terminal 27 E I Tracking signal input terminal 1 28 F I Tracking signal input terminal 2 29 D I Focus signal input terminal 4 30 B I Focus signal input terminal 3 31 C I Focus signal input terminal 2 32 A I Focus signal input terminal 1

UX-H33

4.2 GP101UM281YK (IC750) : Remocon receiver

• Block diagram

Amp Limiter B.P.F

Demodulator Integrator

GND VCC Vout

Cornparator

(No.22044)1-25

UX-H33

4.3 HA12238F (IC32) : R/P Equalizer

• Pin layout

PB-NF1(L)

TEST 2

RIP

PBIN(l)

REC Return

GND

PBIN(R)

TEST 3

PB-NF1(R)

PB-NF2(L)

PB-EQ(L)

Return SW

EQ OUT(L)

TAI(L)

MUTE

PB OUT(L)

REC IN(L)

ALC(L)

NC 22

REC OUT(L)

ALC

TEST

(Open for nomal use)

Iraf

GND

ALC DET

Vcc

REC MUTE OFF/ON

MUTO ON/OFF

REC RETURN ON/OFF

TEST 4

ALC ON/OFF

PB-EQ(R)

PB-NF2(R)

TAI(R)

EQOUT(R)

PB OUT(R)

ARC(R)

REC IN(R)

REC OUT(R)

1-26 (No.22044)

• Pin function Pin No. Symbol Function

1 PB-NF2(R) PB EQ feed back 2 PB-EQ(R) NAB output 3 EQOUT(R) EQ output 4 TAI(R) Tape input 5 PBOUT(R) PB output 6 NC NC pin 7 REC IN(R) REC-EQ input 8 ALC(R) ALC(R) signal out put

9 NC NC pin 10 REC OUT(R) REC output 11 ALC ON/OFF Mode control input 12 TEST4 TEST pin 13 REC Return ON/OFF Mode control input 14 MUTE ON/OFF Mode control input 15 REC Return ON/OFF Mode control input 16 Vcc Vcc Pin 17 ALC DET ALC detection signal out put 18 GND GND pin 19 I REF Equalizer reference current input 20 Test mode Test modepin 21 REC OUT(L) REC output 22 NC NC pin 23 ALC(L) ALC(L) signal out put 24 REC IN(L) REC-EQ input 25 NC NC pin 26 PBOUT(L) PB output 27 TAI(L) Tape input 28 EQOUT(L) EQ output 29 PB-EQ(L) NAB output 30 PB-NF2(L) PB EQ feed back 31 PB-NF1(L) PB EQ feed back 32 TEST2 TEST pin 33 RIP Ripple fillter 34 PBIN(L) PB input 35 REC-RETURN REC Return 36 GND GND pin 37 PBIN(R) PB input 38 NC NC pin 39 TEST3 TEST pin 40 PB-NF1(R) PB EQ feed back

UX-H33

(No.22044)1-27

UX-H33

4.4 HA17758A (IC301) : Dual operational amp

• Pin layout

Vout1

Vin(-)1

Vin(+)1

VEE

4.5 KIA78S05P-T (IC604) : Regulater

• Pin layout

- +

+ -

VCC

Vout2

Vin(-)2

Vin(+)2

• Block diagram

Q14

R10

R11

Q16

Q7 Q8

Q3 Q5

Q10

Q11

Q12

3 INPUT

Q13

1 OUTPUT

2 COMMON

1-28 (No.22044)

4.6 KIA78S06P-T (IC932) : Regulator

•Pin layout

1 2 3

• Block diagram

UX-H33

3 INPUT

Q14

Q16

R11 R10

Q2 Q7

Q10

Q11

Q12

Q13

R7R5R6

1 OUTPUT

2 COMMON

(No.22044)1-29

UX-H33

4.7 LA1838 (IC1): FM AM IF amp & Detector, FM MPX decoder

• Block Diagram

ALC

BUFF

FM S-METER

FM IF

OSC

S-CLRVE

PM DET

REG

AM MIX

SD COMP

AM/FM IF-BUFF

RF.AMP

AM IF

AGC

AM S-METER

GND

DET

TUNING DRIVE

STEREO DRIVE

P-DET

VCC

VCO 384KHz

DECODER ANIT-BIRDIE

STEREO 5N SW

FF 38k

MUTE

19k

12 13

FF 19k

17 16

/LS

PILOT DET

• Pin Function Pin No. Symbol I/O Function

1 FM IN I This is an input terminal of FM IF signal. 2 AM MIX O This is an out put terminal for AM mixer. 3 FM IF I Bypass of FM IF 4 AM IF I Input of AM IF Signal. 5 G ND - This is the device ground terminal. 6 7

TUNED

STEREO

O When the set is tunning, this terminal becomes "L".

O Stereo indicator output. Stereo "L", Mono: "H" 8 VCC - This is the power supply terminal. 9 FM DET - FM detect transformer.

10 AM SD - This is a terminal of AM ceramic filter. 11 FM VSM O Adjust FM SD sensitivity. 12 AM VSM O Adjust AM SD sensitivity. 13 MUTE I/O When the signal of IF REQ of IC121(LC72131) appear, the signal of FM/AM IF output. //Muting

control input. 14 15

FM/AM

MONO/ST

I Change over the FM/AM input. "H" :FM, "L" : AM

O Stereo : "H", Mono: "L" 16 L OUT O Left channel signal output. 17 R OUT O Right channel signal output. 18 L IN I Input terminal of the Left chan nel post AMP. 19 R IN I Input terminal of the Right channel post AMP. 20 RO O Mpx Right channel signal output. 21 LO O Mpx Left channel signal output. 22 MPX IN I Mpx input terminal 23 FM OUT O FM detection output. 24 AM DET O AM detection output. 25 AM AGC I This is an AGC voltage input terminal for AM 26 AFC - This is an output terminal of voltage for FM-AFC. 27 AM RF I AM RF signal input. 28 REG O Register value between pin 26 and pin 28 besides the frequency width of the input signal. 29 AM OSC - This is a terminal of AM Local oscillation circuit. 30 OSC BUFFER O AM Local oscillation Signal output.

1-30 (No.22044)

+ 179 hidden pages