JVC RSWP-1-T Service manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RS-WP1WT

Contents

CLOCK TIMER

DOWN UP SET

C D

AUX

REVERSE MODE

REW

DISPLAY

AHB PRO

RM-SRSWP1J REMOTE CONTROL

TIMER ON/OFF

AUTO

PRESET

TAPE

MULTI CONTROL

VOLUME

TREBLE

STAND BY/ON

PROGRAM

RANDOM

BASS/

CD PORTABLE SYSTEM RS-WP1

STANDBY

STANDBY/ON

SLEEP

REPEAT

TUNER

BAND

FM MODE

BAND

REW FF

Areas suffix

J --------------------------

U.S.A

Safety Precautions Important for laser products Preventing static electricity Disassembly method Adjustment method

1-2 1-3 1-4 1-5 1-17

Flow of functional

operation unit Toc read Maintenance of laser pickup Replacement of laser picup Description of major ICs

1-21 1-22 1-22 1-23

No.20943

May. 2001

RS-WP1WT

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. 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.). 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. 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.

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. (Except the J and C version)

1-2

Important for Laser Products

RS-WP1WT

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

CLASS 1 LASER PRODUCT

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)

1-3

RS-WP1WT

Preventing static electricity

1.Grounding to prevent damage by 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.

2.About the earth processing for the destruction prevention by static electricity

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

2-1 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.

2-2 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 plate

3. Handling the optical pickup

1. 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.)

2. 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.

4.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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

1-4

CAUTION:

Prior to disconnecting the flexible wire extending from the pickup, solder it to the short circuit land to prevent damage to the pickup.

Short circuit land

CN611

RS-WP1WT

Disassembly method

Removing the front panel assembly / rear panel assembly (See Fig.1)

Remove the nine screws A attaching the rear panel assembly on the back of the body.

Pull out the front panel assembly and the rear panel assembly. Disconnect the speaker terminal on the front side and connector CN112 on the connection board on the rear side at the same time.

Removing the CD mechanism assembly section (See Fig.2)

Prior to performing the following procedures, remove the rear panel assembly.

Disconnect the card wire from connector CN614 and the wire from CN624 on the CD mechanism assembly respectively.

Remove the three screws B attaching the CD mechanism assembly section.

Connection board

CN112

Rear panel assembly

Fig.1

CN624

CN614

Removing the cassette mechanism assembly (See Fig.3)

Prior to performing the following procedures, remove the rear panel assembly and the CD mechanism assembly section.

Disconnect the card wire from connector CN33, CN34 on the cassette mechanism assembly.

Remove the four screws C and the cassette mechanism assembly with the wire cover.

Cassette mechanism assembly

Fig.2

CN33

Fig.3

CD mechanism assembly section

CN34

Wire cover

1-5

RS-WP1WT

Removing the function switch board

(See Fig.4)

Prior to performing the following procedures, remove the rear panel assembly.

Disconnect the card wire from connector CN921 on the function switch board.

Remove the two screws D and move the function switch board in the direction of the arrow to disengage the two joints a.

Removing the LCD spare board / LED board (See Fig.5 and 6)

Prior to performing the following procedures, remove the rear panel assembly.

CN921

Joint hook b

LCD spare board

Joint a

LCD board

Joint a

Function switch board

Fig.4

Remove the LCD spare board while pulling each joint hook b outward.

Pull out the LED board. If necessary, unsolder FW925 soldering the wire on the LED board.

Joint hook b

Fig.5

LCD board

LED board

FW925

Fig.6

1-6

RS-WP1WT

Removing the LCD board

(See Fig.7 and 8)

Prior to performing the following procedures, remove the rear panel assembly and the function switch board.

Remove the four screws E attaching the bracket.

Disconnect the card wire from connector CN421, CN422 and the wire from CN913 on the LCD board respectively.

Disconnect the wire from connector CN624 on the CD mechanism assembly.

Remove the two screws F attaching the LCD board (The LCD spare board and the LED board are still attached to the LCD board).

Removing the headphone jack board

(See Fig.9 and 10)

Prior to performing the following procedures, remove the rear panel assembly.

LCD board

CN913

Bracket

Fig.7

CN421

Remove the two screws G attaching the headphone jack board bracket.

Pull out the headphone jack board bracket and the headphone cover at the same time.

Remove the two screws H attaching the headphone jack board.

Disconnect the wire from connector CN711 on the headphone jack board.

CN422

CN624

Fig.8

Headphone cover

Headphone jack board

CN711

Fig.10

Headphone jack bracket

Fig.9

1-7

RS-WP1WT

Removing the main board / sub (1) board / sub (2) board (See Fig.11 to 13)

Prior to performing the following procedures, remove the rear panel assembly, the CD mechanism assembly section and the LCD board.

Remove the two screws J attaching the main board on the back of the rear panel assembly.

Disconnect the card wire from connector CN43 and CN44 on the main board on the inside of the rear panel assembly.

Disconnect the wire from connector CN101 and CN103 on the power board.

Disconnect the wire from connector CN401 on the battery board.

Remove the six screws K attaching the main board. Disconnect the card wire from connector CN91 on the reverse side of the main board.

Remove the screw L and disconnect the sub (1) board from connector CN341 on the main board.

Rear panel assembly

Fig.11

Main board

CN103

CN101

Disconnect the sub (2) board from connector CN371 on the main board.

Main board

CN91

CN43

CN341

CN371

CN44

Fig.12

Fig.13

Battery board

Sub (1) board

Sub (2) board

Power board

CN401

1-8

Removing the remocon board

(See Fig.14)

Remocon board

RS-WP1WT

Prior to performing the following procedure, remove the rear panel assembly.

Remove the screw M attaching the remocon board and disconnect the wire from connector CN913 on the LCD board.

Removing the tuner board (See Fig.15)

Prior to performing the following procedures, remove the rear panel assembly.

LCD board

CN913

Fig.14

Tuner board

CN1

Disconnect the card wire from connector CN1 and the antenna wire from TP1 on the tuner board respectively.

Remove the four screws N attaching the tuner board.

TP1

Fig.15

Antenna wire

1-9

RS-WP1WT

Removing the power board

(See Fig.16 to 18)

Prior to performing the following procedures, remove the rear panel assembly.

Disconnect the wire from connector CN101, CN102 and CN103 on the power board.

Remove the four screws O attaching the power board.

Remove the three screws O’ attaching the heat sink.

Disengage the two joints c and remove the heat sink from the power board.

CN103

CN102

Power board

CN101

Fig.16

O’

Joint c

Heat sink

Fig.17

Power board

Joint c

Fig.18

1-10

Removing the connection board

(See Fig.19)

Prior to performing the following procedures, remove the rear panel assembly.

Disconnect the wire from connector CN102 on the power board.

Remove the two screws P and pull out the connection board.

RS-WP1WT

Removing the battery board (1) / battery board (2) (See Fig.20 and 21)

Prior to performing the following procedures, remove the rear panel assembly.

Remove the battery cover on the back of the rear panel assembly.

Remove the two screws Q retaining the battery board (1).

Pull out the battery board (1) and disconnect the wire from inner connector CN401.

Remove the two screws R and pull out the battery board (2).

Fig.19

Fig.20

Connection board

CN112

Battery cover

Battery board (1)

CN401

Fig.21

Battery board (2)

1-11

RS-WP1WT

Prior to performing the following procedures, remove the rear panel assembly and the CD mechanism assembly section.

Removing the CD mechanism assembly (See Fig.22 to 26)

CAUTION:

Release the three joint hooks d retaining the CD mechanism cover.

Disconnect the wire from connector CN612 on the CD servo board.

Remove the CD mechanism assembly from the three dampers.

Solder the flexible wire connected to connector CN611 on the CD servo board to the short circuit land under the flexible wire. After soldering, disconnect the pickup wire from connector CN611.

CAUTION:

Prior to disconnecting the flexible wire extending from the pickup, solder it to the short circuit land to prevent damage to the pickup.

When reassembling, connect the pickup wire extending from the pickup to connector CN611 on the CD servo board. Then unsolder the wire soldered to the short circuit land.

CD mechanism cover

Joint hook d

Fig.22

CD mechanism cover

Joint hook d

Fig.23

CD servo board

Damper

1-12

Short circuit land

CN611

Damper

CN611

CN612

CD servo assembly

Fig.24

CD mechanism assembly

(Pickup)

Pickup wire

(Short circuit land)

CD mechanism board

Fig.25Fig.26

Removing the CD servo board

(See Fig.27)

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

Remove the four screws S retaining the CD servo board.

Unsolder FW616 where the wire extending from the OPEN / CLOSE switch board is soldered.

Removing the OPEN / CLOSE switch board (See Fig.27)

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

Remove the screw T retaining the OPEN / CLOSE switch board.

Unsolder FW626 where the wire extending from the CD mechanism board is soldered.

FW626

OPEN / CLOSE switch board

FW616

CD mechanism board

Fig.27

RS-WP1WT

Removing the speaker assembly (R) and (L) (See Fig.28)

Prior to performing the following procedure, remove the front assembly.

Remove the four screws U attaching the speaker assembly (R).

Remove the four screws V attaching the speaker assembly (L).

Remove the screw W attaching the speaker terminal. If necessary, disconnect the wire from each speaker terminal.

Removing the sub speaker assembly (R) and (L) (See Fig.28)

Prior to performing the following procedure, remove the front assembly.

Remove the four screws X attaching the sub speaker assembly (R).

Sub speaker assembly (R)

Speaker terminal

Speaker assembly (R)

Fig.28

Sub speaker assembly (L)

Speaker assembly (L)

Remove the four screws Y attaching the sub speaker assembly (L). If necessary, disconnect the wire from each speaker terminal.

1-13

RS-WP1WT

Removing the playback / recording & eraser head (See Fig. 1 to 3)

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).

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.

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.

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

Remove the spring 1 from behind the playback / recording & eraser head.

Flexible board

Cassette mechanism

Trigger armHead mount

Fig. 1

Playback / Recording & eraser head

Flywheel R

Spring 1

Trigger arm

Loosen the reversing azimuth screw retaining the playback / recording & eraser head.

Take out the playback / recording & eraser head from the front of the head mount.

The playback / recoring & eraser head should also be removed similarly according to steps 1 to 7 above.

Reassembling the playback / recording & eraser head (See Fig.3)

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

Fix the reversing azimuth screw.

Set the spring 1 from behind the playback / recording & eraser head.

Attach the flexible P.C. board to the chassis base, as shown in Fig. 3.

The playback / recording & eraser head should also be reassembled similarly to step 1 to 4 above.

CN31

Head amplifier & mechanism control P.C. board

Fig. 2

Playback / Recording & eraser head

Spring 1

Fig. 3

Flywheel R

Reversing azimuth screw

Head mount

Flexible board

Head amplifier & mechanism control P.C. board

1-14

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

Remove the cassette mechanism assembly.

Disconnet the flexible wire from connctor CN31 to the flexible board.

After turning over the cassette mechanism assembly, remove the three screws A retaining the head amplifier & mechanism control board.

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

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

Head amplifier & mechanism control board

Flexible board

CN31

CN32

4pin parallel wire

Fig. 4

RS-WP1WT

Belt

Main motor assembly

Removing the main motor assembly

Remove the two screws B retaining the main motor assembly (See Fig. 4 and 4a).

While raising the main motor, remove the capstan belt from the motor pulley (See Fig. 4a).

CAUTION:

Capstan belt

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 and 6.

Mechanism motor assembly

Motor pulley

Main motor assembly

Capstan belt

Motor pulley

Fig. 4a

Main motor assembly

Flywheel

Fig. 5

Motor pulleyCapstan belt

Fig. 6

1-15

RS-WP1WT

Removing the flywheel (See Fig. 7 and 8)

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

Remove the main motor assembly.

After turning over the cassette mechanism, remove the two slit washers 1 and 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 mecha braket reel pulse P.C. board and solenoid (See Fig. 9 and

10)

Remove the screw C attaching the mecha braket assembly on the cassette assembly.

Remove the screw D attaching the reel pulse board.

Remove the five pawls a to e reattaining the reel pulse board.

From the surface of the reel pulse board parts, remove the two pawls f and g retaining the solenoid.

Slit washer 1

Fig. 7

Mecha braket assembly

Fig. 9

Slit washer 1

1-16

Solenoid

Reel pulse board

a b c d e

Fig.10

Adjustment method

RS-WP1WT

Measuring devices necessary for adjustment

1. Low-frequency oscillator It must have the ability to output 600ohm from 0 dBs at an oscillation frequency of 20 Hz-50 Hz.

2.Attenuator impedance: 600ohm

3.Electronic voltmeter

Tuner section

Voltage input to the tuner .......................... +B: DC 5.7 V

VT: DC 12 V

Standard measuring output ....... 26.1 mV (0.28 V)/3ohm

Input locations ..................... AM: standard loop antenna

FM: TP1 (hot) and TP2 (GND)

Standard settings for measuring volume

4.Distortion meter

5.Frequency counter

6.Wow and flutter meter

7.Test tapes VT-712: tape speed and rotational distortion (3 kHz) VT-724: standard level (1 kHz) VT-703: head angle adjustment (10 kHz), or use VT-73 VT-739: reproduction of frequency characteristics (1 kHz, 63 Hz, 10 kHz)

8.Blank tape Type I : AC-225 (TDK-AD) Type II : AC-514 (TDK-SA)

9.Torque gauge: Tension gauge for playback,

fast-forward and rewind. FWD (TW211A), REW (TW212A) and FF/REW (TW2231A)

Sound ..................................................................... OFF

Effective hyper bass ............................................... OFF

Volume adjustment ........................................... VOL. 23

Precautions for measuring

1.Input 30 pF and 33 kohm to the IF sweeper output

2.Lower the output level of the IF sweeper as much as

3.The IF sweeper needs no adjustment as it is a fixed

4.It is not necessary to perform any kind of adjustment

and 0.082 F and 100 kohm to the sweeper input, respectively.

possible in the adjustable range.

component.

on the MPX, as a ceramic oscillator is used for measuring.

Specifications for measurement

Power supply voltage ................... AC 230 V (50 Hz)

Standard output ........................ Speaker: 0.775V/4ohm

Headphone:0.245V/32ohm Standard frequency and input level

................... 1 kHz: AUX: -8 dBs

Input level for reproduction of recording characteristics

................... AUX: -28 dBs

Measuring output terminal ................... Speaker: CN112

Load resistance .................................................... 4ohm

Radio input signal

AM frequency ..................................................... 400 Hz

Degree of modulation in AM band .......................... 30%

FM frequency ...................................................... 400 Hz

Frequency deviation in FM band ..................... 22.5 kHz

5.FM tracking adjustment is not necessary as a fixed coil is used.

6.The grounding circuit is separate from the input and output. Therefore, be sure to connect to ground carefully when measuring both the input and output voltages simultaneously using 2 channels of the electronic voltmeter.

7.The speaker's minus terminal cannot be connected to ground when using a BTL format amplifier. Therefore, do not connect any type of ground wire to this terminal. The OTL format is used with this system.

8.Use a large wire to connect to the dummy impedance generator when measuring the output.

9.Be sure to use a band pass filter (DV-12) when using mixed tape.

1-17

RS-WP1WT

Location of parts to be adjusted

Cassette handling mechanism Cassette handling mechanism (reverse side)

Head for recording, playing

and erasing the tape

Head azimuth

adjusting screw (fast-forward)

Head azimuth adjusting

screw (rewind)

Head azimuth adjusting

screw (fast-forward)

CN31

Head for recording,

playing and erasing the tape

Head azimuth adjusting

screw (rewind)

Location of parts to be adjusted

VR37 Motor speed

TP Bias oscillation frequency (wide pattern)

L301 Bias oscillation frequency

VR31 Lch recording frequency (bias adjustment)

VR32 Rch recording frequency (bias adjustment)

1-18

Adjustment of cassette handling mechanism

RS-WP1WT

Items Condition Method for adjustment

Confirmation of head angle

Confirmation of tape speed

Test tape: VT-703 (10 kHz) Measuring output terminal: Speaker terminal, speaker (R) (Load resistance: 4ohm), headphone terminal

Test tape: VT-712 (3 kHz) Measuring output terminal: Headphone terminal

(1) Play back the VT-703 test tape. (2) Adjust the head azimuth screws so

that the tape playback mechanism records the maximum output level in both the fast-forward and rewind direction.

(3) In all cases, both the fast-forward and

rewind direction should be adjusted using head azimuth screws.

Adjust VR37 so that the frequency counter records 3,015 Hz 15 Hz when playing back the end of the VT-712 test tape (3 kHz) in the fast-forward direction.

and confirmation

Items to be confirmed and standard values

Items Condition Method for adjustment

Difference in speed between fastforward and rewind

Test tape: VT-712 (3 kHz) Measuring output terminal: Speaker terminal, speaker (R) (Load resistance: 4 ), headphone terminal

The difference between fast-forward and rewind should be less than 60 Hz on the frequency counter when playing back the beginning of the VT-712 test tape (3 kHz) in both directions.

and confirmation

Standard

value

Maximum output

Tape speed of cassette deck: 3,015 Hz 15 Hz

Standard

value

Less than 60 HzShould be

Parts to be

adjusted

Adjust the head azimuth screws when changing the head.

VR37

Parts to be

adjusted

confirmed when changing the motor.

Wow and flutter

Test tape: VT-712 (3 kHz) Measuring output terminal: Headphone terminal

Wow and flutter should be recorded at less than 0.25% (WRMS) when playing back the VT-712 test tape (3 kHz) in the fast-forward direction.

Electronic performance

Items Condition Method for adjustment

Confirmation of output

Confirmation of reproduction of frequency characteristic s

Recording bias frequency

Measuring output terminal: CN34-5 or 7-terminal preamp base Test tape: VT-724

Measuring output terminal: Headphone terminal Test tape: VT-739

Fast-forward or rewind direction: Test tape: TYPE II (AC-

514) Measuring terminal: Bias TP on the base

Confirm that the output from the CN34-5 or 7-terminal preamp base connector is 25 dBs 3 dB when playing back the VT724 test tape. Reference value: The output from the headphone terminal is -7 dB 4 dB.

Confirm that the 10 kHz reproduction level is -1 dB 5 dB compared to the 1 kHz reproduction level when playing back the VT-739 test tape.

Switch the bias (beat cut switch) between 1 and 2 to confirm that the frequency changes. Load the test tape (AC-514 for TYPE II) into the mechanism and preset it to the record-pause mode. Confirm that the bias TP frequency on the base is 100 kHz 6kHz.

and confirmation

Less than

0.25% (WRMS)

Standard

value

Output of CN345 terminal: -25 dBs 3 dB Difference between Lch and Rch: within 3 dB

Difference between 10 kHz and 1 kHz should be -1 dB 5 dB.

100 kHz 6 kHz

Parts to be

adjusted

1-19

RS-WP1WT

Standard values for confirmation of electronic performance

Items Condition Method for adjustment

and confirmation

Erasing current (standard and reference value)

Adjustment of reproduction of frequency characteristic s

Fast-forward and rewind direction: Recording mode AC-514 for TYPE II, AC-225 for TYPE I Measuring terminal: Both erase head terminals

Standard frequencies: 1 kHz and 10 kHz (REF: -20 dB) Test tape: TYPE II: AC-514 Measuring input terminal: OSC IN

Load the test tape (AC-514 for TYPE II, AC-225 for TYPE I) into the tape playback mechanism and preset it to the record-pause mode. After setting it to the recording mode, send 1 M in series to the erase head and measure the erasing current from both erase head terminals.

Load the test tape (AC-514 for TYPE II, AC-225 for TYPE I) into the tape playback mechanism and preset it to the record-pause mode. Input the standard value of -20 dB and the standard frequencies of 1 kHz and 10 kHz repeatedly to the microphone input from the transmitter in the recording mode. Adjust VR31 for Lch and VR32 for Rch so that the difference in level between 10kHz and 1 kHz is -1dB 5dB. Repeat the above for TYPE I and confirm that the difference in level is -XdB dB.

Standard

value

TYPE II: 110 mA TYPE I: 75 mA

Difference in output between 1 kHz and 10 kHz: -1 dB 5 dB

Parts to be

adjusted

Lch: VR31 Rch: VR32

1-20

Flow of functional operation until TOC read

Power ON

Play Key

Slider turns REST SW ON.

Automatic tuning of TE offset

Confirm that the voltage at the pin3 of CN612 is "H"\"L"\"H".

RS-WP1WT

Check Point

Tracking error waveform at TOC reading

Approx.3sec

Tracking servo off states

Automatic measurement of TE amplitude and automatic tuning of TE balance

VREF

pin 33 of IC601(TE)

Approx

1.8V

Disc states to rotate

Tracking servo on states

Disc to be braked to stop

TOC reading finishes

500mv/div 2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of Focus offset

Automatic measurement of Focus S-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 pin18 of IC604 is + 5V?

Confirm that the Focus error S-cuve signal at the pin32 of IC601 is approx.2Vp-p

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

Confirm the waveform of the Tracking error signal. at the pin 33 of IC601 (R6401) (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 eye-pattern at the lead of TS601

1-21

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