Fostex CR-200 Service manual

Service Manual

Model

CR200

Compact Disc Recorder

DANGER - LASER RADIATION WHEN OPEN. AVOID DIRECT EXPOSURE TO BEAM.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION:

TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

The lightening flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

“WARNING”

“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.”

SAFETY INSTRUCTIONS

Read instructions - All the safety and operating instruc-

1. tions should be read before the appliance is operated. Retain instructions - The safety and operating instructions

2. should be retained for future reference. Heed warnings - All warnings on the appliance and in the

3. operating instructions should be adhered to. Follow instructions - All operating and use instructions

4. should be followed. Water and Moisture - The appliance should not be used

5. near water - for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, and the like. Carts and Stands - The appliance should be used only

6. with a cart or stand that is recommended by the manufacturer.

An appliance and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the appliance and cart combination to overturn. Wall or Ceiling Mounting - The appliance should be

7. mounted to a wall or ceiling only as recommended by the manufacturer. Ventilation - The appliance should be situated so that its

8. location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.

ATTENTION:

POUR ÉVITER LES CHOCS ÉLECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU' AU FOND.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

Heat - The appliance should be situated away from heat

9. sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat. Power Sources - The appliance should be connected to a

10. power supply only of the type described in the operating instructions or as marked on the appliance. Grounding or Polarization - The precautions that should

11. be taken so that the grounding or polarization means of an appliance is not defeated. Power Cord Protection - Power supply cords should be

12. routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance. Cleaning - The appliance should be cleaned only as rec-

13. ommended by the manufacturer. Nonuse Periods - The power cord of the appliance should

14. be unplugged from the outlet when left unused for a long period of time. Object and Liquid Entry - Care should be taken so that

15. objects do not fall and liquids are not spilled into the enclosure through openings. Damage requiring Service - The appliance should be ser-

16. viced by qualified service personnel when:

The power supply cord or the plug has been damaged;

or Objects have fallen, or liquid has been spilled into the

appliance; or The appliance has been exposed to rain; or

The appliance does not appear to operate normally or

exhibits a marked changed in performance; or The appliance has been dropped, or the enclosure

damaged.

Servicing - The user should not attempt to service the ap-

17. pliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.

TABLE OF CONTENTS

CR200

1. CD-R THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. CONTROLS, INDICATORS & CONNECTORS . . . . . . . . . . . . . . . . .

4. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. ADDITIONAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . .

6. EXPLODED VIEW, PCB ASSEMBLY & PARTS LIST . . . . . . . .

7. CIRCUIT & BLOCK DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . .

8. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 10 12 39 65 77 85

NOTES

Adjusting procedures are given in this manual which also includes a Parts List and circuit diagrams to

assist the service technician in maintaining the Model CR200.

The following accessory is supplied with CR200 as a standard.

Owner's manual, CR200 : 8288407000 (for export model) Remote control unit Model 8317 : 8270829000 Audio cable (L : 1.2m) : 8276912000 Power cable : 8276910000 (for USA model)

: 8276911000 (for EUR model)

Following is the packing material for the Model CR200.

Carton, inner, CR200 : 8228718000 Carton, outer, CR200 : 8228897000 Packing, L, CR200 : 8228443000 Packing, R, CR200 : 8228444000

CAUTION

Parts marked with this sign are safety critical components. They must always be replaced with identical

components. Refer to the Fostex Parts List and ensure exact replacement.

CR200

1. CD-R THEORY

1-1. Physical layout compared to CD

The conventional CD and CD-R discs basically have the same physical layout. However, as you can see from the Fig. 1, comparing to the conventional CD, the CD-R disc also has socalled “minus” areas such as PCA (Power Calibration Area) and PMA (Program Memory Area) where the temporary information is recorded.

Φ120

max Φ118 Φ44.7 min Φ33 min Φ26 Φ15

hole

Clamping

area

Pregroove area with address (ATIP)

Center

Layout of unrecorded CD-R disc

Information area

• Unrecorded, blank disc The information area is located next to the clamping area and the center hole. This area contains a pregroove with CLV (Constant Linear Velocity) clocking information and a time code.

• Partially recorded disc The CD-R system gives the opportunity to record a disc in several actions at a different time on a different recorder. After the first recording, the information area is divided into five parts as shown below and in the right.

1: Power Calibration Area (PCA) 2: Program Memory Area (PMA) 3: Lead-in Area 4: Program Area 5: Lead-out Area

• Finalized disc After finalizing the disc, the CD-R disc will become compatible with the RED Book (for regular CD) definitions and specifications. Therefore, it can be played back on conventional CD players. The Information Area of a finalized disc consists of three parts:

1: Lead-In Area 2: Program Area 3: Lead-Out Area

max Φ118 max Φ116

Φ50 Φ46 Φ44.7

PCA

Table Of Contents (TOC)

temporary

PMA

MUSIC

Program

Area

Lead-in Area

recorded

part

Recordable

User Area

+ Lead-out Area

Layout of partially recorded CD-R disc

max Φ118 max Φ116

Φ50 Φ46

final Table of Contents (TOC)

Lead-in Area

recorded part

MUSIC

Program Area

Layout of recorded CD-R disc

max Φ118 max Φ116

Φ50 Φ46

recorded part

MUSIC

TOC

Layout of conventional CD disc

Lead-out

Area

Lead-out

Area

Fig. 1 Cross Section of CD-R & CD Disc

1-2. Pregrooved track wobbling + ATIP

When manufacturing the CD-R disc, it has been ÒpregroovedÓ. This pregroove in the CD-R disc is not a perfect spiral but is wobbled so that the CD-R disc can be recognized by a CD-R recorder even when it is completely blank. It has many purposes. It not only helps keep the servo on an exact tracking of outgoing spiral but also the demodulated wobbling frequency contains the time information in digital format (21.05 kHz = Ò0Ó, 23.05 kHz = Ò1Ó). These frequencies have been selected so that the mean frequency is equal to Fs / 2 (= 22.05 kHz). Also the interleaved is the manufacturer's measured default laser power level.

0.6µm

(track width)

1.6µm (track distance)

CR200

22.05 ± 1kHz = ~ 60µm

Fig. 2 Structure of Pregrooved Disc

1-3. PCA + consequence

Each recorder has a tolerance in the laser power and the dye from different manufacturers varies. In order to optimize the recorder / disc combination, there is a PCA (Power Calibration Area) included in the CD-R disk. This area consists of two parts, the Count Area and Test Area. In the Test Area, test recordings are made, stepping through several power levels. After playing back the recorded test signal, the optimum level is automatically determined. This value is memorized until the disk tray is opened. The Count Area keeps the track on how many of the test areas have been used indicating where to start the next test. The PCA is designed to accommodate for 100 tests. When the PCA is full, the default value written in the wobbled groove is used instead.

Test Area

PCA

Count Area

PMA

Lead In Area

Partition

100

4321

531

Fig. 3 Organization of PCA, PMA and Lead-In Area

CAUTION :

Every time the CD-R disc is inserted, one test is performed. Also if you leave the disc in the recorder at power off, a test will be performed when powering on. This might lead to the situation that the PCA might be fully used up even if there is a remaining space to record audio signal. The recordings made after the PCA is fully used up will not be optimal in performance.

CR200

1-4. CD-R Disc Structure and Bubbling Process

Label

The materials of CD-R disc consists of label, protective layer, reflective layer, organic dye layer and transparent substrate.

2345678901234567890123456789012123456789012345

Transparent

UV protective layer

Refective layer

Organic dye layer

substrate

Land

Groove

Laser beam

Fig. 4 Cross Section of CD-R disc

During recording, the laser is tracing the wobbled groove. When a pit is to be recorded, the laser fires off a high power beam and the organic dye will become black and deformed. This is the way a Ònon-reflectiveÓ part is created. When a groove is to be recorded, the laser is not fired and the high-reflective surface is maintained. If the data word contains successive the same information (e.g. 111 or 000), the pit will be continuous. When the data word contains changes, the pit - groove status will also change.

• Recording Principle

A high power laser beam is shot.

• Playback Principle NO PITS

A low power laser beam is shot and high reflectance is obtained.

Organic dye becomes black and pit is created.

ON PITS

A low power laser beam is shot and only low reflectance is obtained.

Fig. 5 Recording & Playback Principle

1-5. Finalize

In order to be playable on an ordinal CD-player, the CD-R disc must have a corresponding data for TOC (Table Of Contents). This area is not used until all the recording is completed. Instead, a special area called PMA (Program Memory Area) is used.

When the disk is full or all the recording is completed, the disk can be finalized. This means that the temporary information in the PMA is checked and transferred to TOC. Now the disk is playable on an ordinal CD player but it will not be recordable any more.

2. SPECIFICATIONS

FUNCTIONS

Sampling rate converter Fs : 48 kHz / 32 kHz → 44.1 kHz Automatic disk distinction Time display switching Synchronous to one song / All songs / DAT ID REC mute Automatic power calibration Automatic track increment Manual track increment Automatic REC PAUSE Previous End section of previous track can be reproduced during REC

PAUSE mode.

Fader in / fader out Can be controlled only by infra-red remote controller Disk remaining time display Sampling monitor Skip play Track skip on / off Can be controlled only by main unit key One song / all songs program repeat Can be controlled only by infra-red remote controller Program play Manual search Track search Direct search Can be controlled only by infra-red remote controller Program setting / clear Can be controlled only by infra-red remote controller Input sensitivity switch SW 1 (+4 dBu / -8 dBu, rear panel) Infra-red remote controller on / off switch SW 2 (rear panel) Digital out on / off switch SW 2 (rear panel) Copy bit setting switch SW 2 (No restriction / One time only / Prohibited, rear panel)

CR200

FL DISPLAY CONTENTS

PLAY REC PAUSE REPEAT 1-REPEAT AUTO TRACK No. PROGRAM TOC Level meter Track number Input sampling frequency Elapsed time Remaining time

Total time Remaining record time

CR200

GENERAL

Model Compact disc recorder Applicable discs CDs and CD-Rs Number of channels 2 channels (stereo) Power supply AC 120 V, 60 Hz

AC 220 ~ 230 V, 50 / 60 Hz

Power consumption 21 W Weight (without package) 6.2 kg / 13.7 lbs Maximum dimensions 482 (W) x 134 (H) x 294 (D) mm

18-31/32 (W) x 5-9/32 (H) x 11-9/16 (D) inch

AUDIO UNIT

Playback (CD)

Frequency characteristics 4 Hz ~ 20 kHz ± 1.0 dB S/N 83 dB or more (EIAJ) Dynamic range 83 dB or more (EIAJ) Total harmonic distortion 0.01 % or less (EIAJ) Channel separation 90 dB or more (EIAJ) De-emphasis deviation 0 ± 1.5 dB or less (EIAJ) Level difference between channels 1.0 dB or less (EIAJ) Output voltage 2.4 V ± 0.3 V rms

Monitoring (analog RCA pin input)

Frequency characteristics 4 Hz ~ 20 kHz ± 1.0 dB S/N 83 dB or more (EIAJ) Dynamic range 83 dB or more (EIAJ) Total harmonic distortion 0.01 % or less (EIAJ) Maximum input level 3.2 V rms or more Minimum input level 0.4 V rms or less

Record & Playback (analog RCA pin input)

Frequency characteristics 4 Hz ~ 20 kHz ± 1.0 dB S/N 83 dB or more (EIAJ) Dynamic range 83 dB or more (EIAJ) Total harmonic distortion 0.01 % or less (EIAJ)

Monitoring (Digital coaxial input)

Frequency characteristics 4 Hz ~ 20 kHz ± 1.0 dB S/N 95 dB or more (EIAJ) Dynamic range 90 dB or more (EIAJ) Total harmonic distortion 0.01 % or less (EIAJ) Maximum input level 0.6 V rms or more Minimum input level 0.2 V rms or less

Record & Playback (Digital coaxial input)

Frequency characteristics 4 Hz ~ 20 kHz ± 1.0 dB S/N 90 dB (analog) / 105 dB (digital) Dynamic range 90 dB (analog) / 95 dB (digital) Total harmonic distortion 0.01 % (analog) / 0.003 % (digital)

INPUT / OUTPUT JACKS

Analog Input

XLR-3-31 type (x 2)

Standard input level +4 dBu / -10 dBV (switchable) Input impedance 10 k½

RCA type (x 2)

Standard input level -10 dBV Input impedance 27 k½ or more

Analog Output (x 2)

RCA type

Standard output level -10 dBV Load impedance 10 k½

Digital Input

XLR-3-31 type IEC958 Part 2 (AES/EBU) RCA type IEC958 Part 3 (S/P DIF) Optical type IEC958 Part 3 (S/P DIF)

Digital Output

RCA type IEC958 Part 3 (S/P DIF) Optical type IEC958 Part 3 (S/P DIF)

Parallel remote DIN 8-pin connector (Outer shell is grounded.)

Pin 1 : PAUSE Pin 2 : Pin 3 : PLAY Pin 4 : NC Pin 5 : Manual track write Pin 6 : REC Pin 7 : Pin 8 : STOP

CR200

3. CONTROLS, INDICATORS & CONNECTORS

CR200 COMPACT DISC RECORDER

TRACK NO.

POWER

2 3 4 5

AUTO/MANUAL

INPUT

SELECTOR

(MANUAL)

SYNCHRO

< Front Panel Section >

Power indicator

Power switch [

Input selector button [

Digital synchro button [

Finalize button [

Time button [

Disc tray

Stop button [ ]

Open/close button [ ]

10.

Pause button [ ]

11.

Play button [ ]

12.

Headphone jack [

13.

Headphone level control [

TIME

POWER

FINALIZE

]

INPUT SELECTOR

DIGITAL SYNCHRO

]

PHONES

25 24

COPY BIT

WRITE TIME

DIGITAL

FINALIZE

6 7

]

PHONES LEVEL

23 22

]

18 17 161921 20

MIN

TRACK

SEC

14.

Skip play on/off switch [

15.

Record muting button [

16.

Record indicator

17.

Record button [

18.

Track skip buttons [

19.

Record level control [

20.

Track search buttons [ ][ ]

21.

Record balance control [

22.

Display panel

23.

Remote control sensor

24.

Copy bit indicator [

25.

Track no. write button [

TRACK NO. AUTO/MANUAL, WRITE

REC BALANCE

8 9 10 11 12

RECORD

REC LEVEL

MIN MAX

SKIP PLAY ON/OFF

REC MUTE

]

SKIP SET, CLEAR

REC LEVEL

REC BALANCE

COPY BIT

]

RECORD

REC MUTE

SKIP

SKIP PLAY

ON/OFF

SET

CLEAR

PHONES LEVEL

MIN MAX

PHONES

15 14

]

CR200

LINE IN

SW 1

PUSH HEAR

123

BALANCE IN DIGITAL IN

OFF ON

DIGITAL OUT

< Rear Panel Section >

26.

Analog line input connectors [

27.

Digital input/output connectors [

28.

Digital input/output connectors [

29.

Analog line output connectors [

30.

GND terminal [

31.

AC inlet [

SIGNAL GND

]

AC IN

COAXIAL IEC 958 DIGITAL IN/OUT

IN OUT IN OUT

OPTICAL

PUSH HEAR

1234

SW 2

LINE IN L, R

OPTICAL IN, OUT COAXIAL IN, OUT

LINE OUT

]

LINE OUT

PUSH HEAR

AES/EBU

PARALLEL

REMOTE

]

30 31

AC IN

SIGNAL GND

32.

Parallel remote connector [

]

33.

Digital input connector [

]

34.

Dip switch [

35.

Digital out on/off switch [

36.

Analog balanced input connectors [

37.

Input select switch [

SW 2

]

PARALLEL REMOTE

AES/EBU DIGITAL IN

DIGITAL OUT OFF/ON

BALANCE IN

]

SW 1

]

< Remote Controller Section >

38.

Fader button [

39.

MODEL 8317

REC

TRACK NO.

WRITE

FADER

48 47

Repeat button [

40.

Manual search buttons [ ][ ] Track search buttons [ ][ ] Stop button [ ]

FADER

Pause button [ ]

REPEAT

123

456

789

TIME

PGM CHECK CLEAR

44 43

Play button [ ]

41.

Numeric buttons [

42.

Program button [

43.

Program check button [

44.

Program clear button [

45.

Time button [

46.

Record muting button [ ]

47.

Manual track no. write button [

48.

Record button [

TIME

]

REPEAT

1 to 10, >10

]

PGM

CHECK

CLEAR

]

REC

]

TRACK NO. WRITE

]

CR200

4. ADJUSTING PROCEDURES

4-1. ADJUSTING PROCEDURES

Even if nothing is wrong with the pickup section and hardware components in the circuits, due to the misalignment of various adjustments, there is a possibility that the CR200 does not work properly or at all. According to the following procedures, make adjustments correctly.

Test equipment and adjusting tools

• Dual trace oscilloscope, 100MHz or higher bandwidth

• Sinewave signal generator

• Test disk: TCD-785 (Almedio) and STD-R03 (Pioneer)

• Low pass filter 15k½ + 0.001µF x 2 pcs. 39k½ + 0.001µF x 1 pc.

• High pass filter

3.9k½ + 180pF x 1 pc.

• Resistor 100k½

• Hex wrench: 1.27mm diagonal

• Regular tools such as a pair of tweezers, cutter, long-nose pliers and minus screw driver

• Ceramic screw driver. Vessel 9000 series are recommended.

• Digital multimeter (measuring voltage: less than 1mV)

Table of adjusting item / test point / pot

Adjustment 1

No.

Playback power adjustment

Coarse focus offset adjustment

Coarse skew adjustment

Coarse grating adjustment

DPP (tracking offset) adjustment

Fine focus offset adjustment

Fine skew adjustment

Grating readjustment

Item

Test Point CN104 Pin-7 (PWAJT) CN204 Pin-1 (RF) CN204 Pin-1 (RF)

CN104 Pin-3 (TE) CN104 Pin-3 (TE) CN204 Pin-1 (RF) CN204 Pin-1 (RF)

CN104 Pin-3 (TE)

Pot VR103 (PB. PW) VR105 (FE. OFS) Radial adjustment screw Tangential adjusting screw Grating adjustment screw VR112 (TE. OFS) VR105 (FE. OFS) Radial adjustment screw Tangential adjusting screw Grating adjustment screw

Adjustment 2

123

CR200

No.

CD-R VCO control voltage adjustment

Multi pulse time adjustment

EFM rising edge time adjustment

3T rising edge time adjustment

WBL + offset adjustment

Coarse WBL offset adjustment

RF offset adjustment

Playback power readjustment

Coarse focus offset adjustment

Main and sub mix ratio adjustment

Tracking amp. gain adjustment

Item

SERVO UCOM BOARD ASSY

Test Point CN331 Pin-1 (VCOIN) CN3506 Pin-6 (MPLS) CN3506 Pin-5 (EFMIN) CN3506 Pin-4 (SEFM) CN3506 Pin-3 (3TIN) CN3506 Pin-2 (3TOUT) CN104 Pin-6 (RWBL) CN104 Pin-5 (WBL) CN204 Pin-1 (RF) CN104 Pin-7 (PWAJT) CN204 Pin-1 (RF) CN104 Pin-1 (STE) CN104 Pin-2 (MSTE) CN104 Pin-3 (TE)

Pot VR301 (VCO CON) VR3501 (MPLS DLY) VR3502 (EFM DLY)

VR3503 (3T DLY)

VR107 (WBL+. OFS) VR108 (WBL. OFS) VR121 (RF. OFS) VR103 (PB. PW) VR105 (FE. OFS) VR110 (MS. MIX)

VR111 (TE. GAIN)

CN5021

Shorten the two lands to put the CR200 into the TEST MODE.

CN5021

1. ACT ERR

2. ACT IN

3. V+5A

TE. GAIN

FCS. GAIN

TEST

MODE

CN204

ADJUST TP

VR202

VR201

CN204

1. RF

2. TRKER

3. TRKIN

4. A GND

5. FCSIN

6. FCSER

STRATEGY BOARD ASSY

CN3506

1. DGND

2. 3T OUT

3. 3T IN

4. SEFM

5. EFM IN

6. MPLS

CN331

TP30

VR301 VCO CON

Fig. 7

CN3506

CN331

1. VCOIN

2. GND

VR3503 3T. DLY

VR3502

EFM DLY

VR3501

MPLS DLY

Fig. 6

CR200

Adjustment 2 (continued)

No.

Tracking offset adjustment

ACT offset adfjustment

ACT gain adjustment

Fine focus offset adjustment

WBL balance adjustment

Fine WBL offset adjustment

WBL focus offset adjustment

Recording power adjustment

HF amp. gain adjustmnet

Focus servo loop gain adjustment

Tracking servo loop gain adjustment

Item

Test Point CN104 Pin-3 (TE) CN5021 Pin-1 (ACT ERR) CN5021 Pin-1 (ACT ERR) CN204 Pin-1 (RF) CN104 Pin-5 (WBL) CN104 Pin-5 (WBL) CN104 Pin-5 (WBL) CN104 Pin-7 (PWAJT) CN104 Pin-8 (HF) CN204 Pin-5 (FCSIN) CN204 Pin-6 (FCSER) CN204 Pin-2 (TRKER) CN204 Pin-3 (TRKIN)

VR10

ACT. GAIN

Pot VR112 (TE. OFS) VR1 (ACT. OFS) VR10 (ACT. GAIN) VR105 (FE. OFS) VR106 (WBL. BALANCE) VR108 (WBL. OFS) VR115 (WFE. OFS) VR104 (REC. PW) VR119 (HF. GAIN) VR201 (FCS. GAIN)

VR202 (TE. GAIN)

VR103 PB. PW

ACT. OFS

HEAD BOARD ASSY

VR121

RF. OFS

VR105 FE. OFS

VR115 WFE. OFS

VR104 REC. PW

VR108

WBL. OFS

WBL+. OFS

VR1

TE. GAIN

VR119

HF GAIN

VR107

VR110

MS. MIX

VR112

TE. OFS

VR111

WBL BALANCE

VR106

CN104

1. STE

2. MSTE

3. TE

4. A GND

5. WBL

6. RWBL

7. PWAJT

8. HF

Fig. 8

Notes

(1) Use a 10 : 1 probe for the oscilloscope. (2) All the knob positions (settings) for the oscilloscope in the adjustment procedures are for when a 10 : 1 probe is used.

Test Mode

This model has a test mode so that the adjustments and checking required for servicing can be carried out easily. When this model is put into test mode, the keys on the front panel would work differently from normal condition. Adjustments and checks can be carried out by operating these keys with the correct procedures. On this model, all adjustments are carried out in test mode.

[ Setting to Test Mode ]

The way to set this model into test mode. (1) Plug the power cord back into the AC socket. (2) Shorten the test mode lands. (See Fig. 6.) (3) Press the Power SW ON.

When the test mode is set correctly, the display is different from what it usually is when the power is turned on. (lights up all FL display) If the display is still the same as usual, test mode has not been set correctly, so repeat Steps 1 Ð 3.

CR200

[ Release from Test Mode ]

Here is the procedure for releasing the test mode. (1) Press the STOP key and stop all operations. (2) Press the Power SW OFF.

[ Operations of the Keys in Test Mode ]

Code Key Name Function in Test Mode Explanation

DIGITAL SYNCHRO

FINALIZE

PLAY

PAUSE

Playback laser diode ON Lights up the laser diode by playback power.

The laser diode is lit up and the focus actuator is lowered, then raised slowly and the focus servo is closed at the point where the objective lens is focused on the disc. With the player in this state, if you slightly rotate the stopped

Focus servo closes

Spindle servo ON

Tracking servo close/open

disc by hand, you can hear the sound of focus servo. If you can hear this sound, the focus servo is operating correctly. If you press the key with no disc mounted, the laser diode lights up, the focus actuator is pulled down, then the actuator is raised and lowered three times and returned to its original position. Starts the spindle motor in the clockwise direction and when the laser rotation reaches the prescribed speed (about 500 rpm at the inner periphery), set the servo in a closed loop. Pressing this key when the focus servo and spindle servo are operating correctly in closed loops puts the tracking servo into a closed loop, displays the track number being played back and the elapsed time on the front panel. If the elapsed time is not displayed or not counted correctly, it may be that something is out of adjustment, or that there is some other problem. This key is a toggle key and open/close the tracking servo alternately. This key has no effect if no disc is mounted.

CR200

Code Key Name Function in Test Mode Explanation

Moves the pickup position toward the inner diameter of the

disc. When this ke MANUAL/ TRACK

•

SEARCH REV

MANUAL/ TRACK

•

SEARCH FWD

STOP

OPEN/CLOSE Disc tra

RECORD

Carriage reverse (inwards)

Carriage forward (outwards)

Stop

open/close

Maximum recordin Laser diode ON

power

REC MUTE

AUTO/ MANUAL

WRITE (MANUAL) LED Lights UP: Optical axis servo ON

TIME 0 sec.) of disc.

Focus offset servo COPY BIT LED Lights UP: C/N in the best condition

Optical axis servo switching

Search to the lead of disc. (It works only CD-R use.)

closed loop, the tracking servo automatically goes into an

open loop.

Since the motor does not automatically stop at the

mechanical end point in test mode, be careful with this

operation.

Moves the pickup position toward the outer diameter of the

disc. When this key is pressed with the tracking servo in a

closed loop, the tracking servo automatically goes into an

open loop.

Since the motor does not automatically stop at the

mechanical end point in test mode, be careful with this

operation.

Initializes and the disc rotation stops.

The pickup and disc remain where they are when this key is

pressed.

Open/close the disc tray. This key is a toggle key and

open/close tray alternately.

Pressing this key when the disc is turning stops the disc,

then opens the tray.

This key operation does not affect the position of the pickup.

Lights up the laser diode with maximum recording power and

normal EFM by pressing REC and REC MUTE keys in order.

* The laser diode may be damaged if adjustments are made

before pressing these keys.

Switches the focus offset state.

Lights OFF: Jitter in the best condition

Switches the ON/OFF of the optical axis servo.

Light OFF: Optical axis servo OFF

When using the CD-R disc, search to the lead (0 min.

(It doesn't work in CD disc use.)

is pressed with the tracking servo in a

[ How to Play Back a Disc in Test Mode ]

In test mode, each servo operates independently. Thus, it is required to press the keys and close the servo in a correct order so that a disc can be played Here is the key operation sequence for playing back a disc in test mode.

FINALIZE

PLAY

PAUSE

Wait at least 2 ~ 3 seconds between each of these operations.

Lights up the laser diode and closes the focus servo.

Starts the spindle motor and closes the spindle servo.

Closes the tracking servo.

4.2 Adjustment 1

4.2.1 Playback Power Adjustment

DANGER - LASER RADIATION WHEN OPEN. AVOID DIRECT EXPOSURE TO BEAM.

• Objective To optimize the playback power of the laser diode.

• Symptom when out of adjustment Does not start playing, track search is impossible, tracks are skipped.

• Measurement instrument connections Multimeter to CN104, Pin-7 (PWAJT) (HEAD BOARD assy)

GND probe can be connected to CN104, Pin-4 (AGND).

• Disc None needed

• Player state Test mode, Playback laser diode ON

• Adjustment location VR103 (PB. PW) (HEAD BOARD assy)

CAUTION:

Perform this adjustment more than 5 minutes after starting up the test mode.

(a)

This adjustment cannot be performed accurately if disc is inserted. Be sure to remove disc first before adjustments.

(b)

If the specified voltage is not obtained by turning VR103, the pickup assy might be defective. Also be careful not to get

(c)

the pickup lens dirty.

CR200

[ Procedures ]

• When adjusting with the multimeter.

Lights up the playback laser diode using the DIGITAL SYNCHRO key.

(1)

Adjust the voltage value of Pin-7 (PWAJT) of CN104 (TP1) to the voltage value (PB PW voltage ± 5mV) displayed on

(2)

the pickup flexible cable using VR103 (PB PW).

• Reference: When adjusting with the optical power meter.

Move the pickup to the outer edge of the disc with the MANUAL / TRACK SEARCH FWD key.

(1)

Lights up the playback laser diode by the DIGITAL SYNCHRO key.

(2)

Shine the light discharged from the objective lens in the pickup on the light power meter sensor. Adjust VR103 (PB.

(3)

PW) so that the playback laser diode output is an average 0.65 mW ± 0.05mW. (Wavelength 790nm, Average mode)

P : Playback power

R : Recording power

* Recording on the disc is not possible in test mode.

Fig. 9

CR200

4.2.2 Coarse Focus Offset Adjustment

• Objective To coarse adjust the DC offset voltage of the focus servo circuit to perform the tracking and slider adjustments correctly.

• Symptom when out of adjustment The unit does not focus in, sound is cracking and the RF signal is dirty.

• Measurement instrument connections Osciloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARDassy) GND probe can be connected to CN204, Pin-4 (AGND). [ Settings ]: 20 mV/div., 2 mS/div., DC mode

• Disc TCD-785

• Player state Test mode, focus and spindle servos: closed, tracking servo: open

• Adjustment location VR105 (FE. OFS) (HEAD BOARD assy)

[ Procedures ]

Press the FINALIZE key and the PLAY key in the order to close the focus servo and then the spindle servo.

(1)

Adjust VR105 (FE. OFS) so that the amplitude of waveform at CN204 (TP201), Pin-1 (RF) is maximum.

(2)

NOTE:

The oscilloscope displays a moving image, not a ÒSTILLÓ image as shown below. In order to verify that the focus servo is on, tap on the machine gently and listen to the sound indicating the servo operation.

Out of adjustment

(Waveform amplitude is at maximum.)

Optimum adjustment

Fig. 10

4.2.3 Coarse Skew Adjustment

• Objective To coarse adjust the angle of pickup to the disc for performing the grating and DPP (tracking offset) adjustments correctly.

• Symptom when out of adjustment Sound is cracking, some discs can be played but not others.

• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy) GND probe can be connected to CN204, Pin-4 (AGND). [ Settings ]: 20 mV/div., 200 nS/div., AC mode

• Disc TCD-785

• Player state Test mode, focus and spindle servos: closed, tracking servo: open

• Adjustment location Radial adjustment screw and tangential adjustment screw

CAUTION:

Before executing this adjustment, you must cut a few wire binders, disconnect cable and loosen 4 screws so that the HEAD BOARD assy can be tilted up and fixed into the slits.

[ Procedures ]

Move the pickup to the position where the radial/tangential adjustment screws will be seen with the MANUAL / TRACK

(1)

SEARCH FWD or REV keys so that the radial/tangential adjustment screws can be adjusted. Press the FINALIZE key and the PLAY key in the order to close the focus servo and then the spindle servo.

(2) (3)

Adjust the RAD (radial direction) and TAN (tangential direction) adjustment screws alternately with hexagonal screwdriver (1.27 mm diagonal) to maximize the RF output at CN204 (TP201), Pin-1.

Hexagonal screwdriver

CR200

NOTE:

Radial direction and tangential direction mean the direction relative to the disc shown in Fig. 11.

Radial direction

Tangential direction

Disc

Fig. 2

Radial adjustment screw

Tangential adjustment screw

FRONT PANEL

Fig. 11

CR200

4.2.4 Coarse Grating Adjustment

• Objective To align the tracking error generation laser beam spots to the optimum angle on the track.

• Symptom when out of adjustment Does not start playing, track search is impossible, tracks are skipped.

• Measurement instrument connections Oscilloscope to CN104, Pin-3 (TE) via a low pass filter. (HEAD BOARD assy) See Fig. 14 below. GND probe can be connected to CN104, Pin-4 (AGND). [ Settings ]: 50 mV/div., 5 mS/div., DC mode

• Disc TCD-785

• Player state Test mode, focus and spindle servos: closed, tracking servo: open.

• Adjustment location Grating adjustment screw in the slit

[ Procedures ]

Move the pickup to the position where the grating adjustment slit will be seen with the MANUAL / TRACK SEARCH

(1)

FWD or REV keys so that the grating adjustment can be adjusted. Press the FINALIZE key and the PLAY key in the order to close the focus servo and then spindle servo.

(2)

Insert a screwdriver into the grating adjustment slit and adjust the grating to find the null point.

(3)

For more details, see next page.

If you slowly turn the screwdriver clockwise from the null point, the amplitude of the wave gradually increases. Then, if

(4)

you continue turning the screwdriver, the amplitude of the wave becomes smaller again. Turn the screwdriver counterclockwise from the null point and set the grating to the first point where the wave amplitude reaches its maximum.

Reference : Fig. 13 shows the relation between the angle of the tracking beam with the track and the waveform.

Return the pickup to more or less midway across disc with the MANUAL / TRACK SEARCH key. Then, press the

(5)

PAUSE key and check that the track number and elapsed time are displayed on the front panel. If they are not displayed at this time or the elapsed time changes irregularly, check the null point and adjust the grating again.

Small screwdriver

Grating adjustment

CN104 (TP1)

Pin 3 (TE)

Pin 4 (AGND)

HEAD BOARD ASSY

LPF

15kΩ

0.001 µF

(10 : 1)

screw

Fig. 3

Fig. 12

[ How to find the null point ]

Turning the grating counterclockwise

Turning the grating clockwise

Null point

Grating adjustment position

Waveform of CN104 (TP1), Pin 3 (TE)

Fig. 4

Null point waveform Maximum amplitude

waveform

Waveform other than the null point

Note : If the difference between the amplitude of the error signal at the innermost edge and outermost edge of the disc is more than 10%, adjust the grating again.

When you insert the small screwdriver into the slit for the grating adjustment and change the grating angle, the amplitude of the tracking error signal at CN104 (TP1), Pin 3 (TE) changes. Within the range for the grating, there are five or six locations where the amplitude of the wave reaches a minimum. Of these five or six locations, there is only one at which the envelope of the waveform is smooth. This location is where the three laser beams divided by the grating are all right above the same track. (See Fig. 13.) This point is called the null point. When adjusting the grating, this null point is found and used as the reference position.

CR200

Fig. 13

4.2.5 DPP (Tracking Offset) Adjustment

• Objective To correct for the variation in the sensitivity of the tracking photodiode.

• Symptom when out of adjustment The unit does not playback, track search is impossible, tracks are skipped.

• Measurement instrument connections Oscilloscope to CN104, Pin-3 (TE)

[This connection must be via a low pass filter (15kW + 0.001µF). ] GND probe can be connected to CN104, Pin-4 (AGND). [ Settings ]: 50 mV/div., 5 mS/div., DC mode

• Disc TCD-785

• Player state Test mode, focus and spindle servos: closed, tracking servo: open.

• Adjustment location VR112 (TE. OFS) (HEAD BOARD assy)

[ Procedures ]

Move the pickup to the midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD or REV keys.

(1)

Press the FINALIZE key and the PLAY key in the order to close the focus servo and then spindle servo.

(2)

Line up the bright line (ground) at the center of the oscilloscope screen and put the oscilloscope into DC mode.

(3)

Adjust VR112 (TE. OFS) so that the positive amplitude and negative amplitude of the tracking error signal at CN104,

(4)

Pin-3 (TE) are the same (in other words, so that there is no DC component).

When there is a DC component

A = B

GND

Fig. 14

When there is no DC component

A = B

GND

CR200

4.2.6 Fine Focus Offset Adjustment

• Objective To optimize the DC offset voltage of the focus servo circuit.

• Symptom when out of adjustment The unit does not focus in, sound is caracking and the RF signal is dirty.

• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy) GND probe can be connected to CN204, Pin-4 (AGND). [ Settings ]: 20 mV/div., 500 nS/div., AC mode

• Disc TCD-785

• Player state Test mode, play

• Adjustment location VR105 (FE. OFS) (HEAD BOARD assy)

[ Procedures ]

Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD or REV keys.

(1)

Press the FINALIZE key, the PLAY key and the PAUSE key in the order to close the respective servos and put the player

(2)

into play mode. Adjust VR105 (FE. OFS) so that the 3T waveform at CN204, Pin-1 (RF) is maximum.

(3)

Out of adjustment Optimum adjustment

Fig. 15

4.2.7 Fine Skew Adjustment

• Objective To adjust the angle of the pickup relative to the disc so that the laser beams are shone straight down into the disc for the best read out of the RF signals.

• Symptom when out of adjustment Sound is cracking, some discs can be played but not others..

• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy) GND probe can be connected to CN204, Pin-4 (AGND). [ Settings ]: 20 mV/div., 200 nS/div., AC mode

• Disc TCD-785

• Player state Test mode, play

• Adjustment location Pickup radial adjustment screw and tangential adjustment screw

[ Procedures ]

Move the pickup to the position where the radial/tangential adjustment screws will be seen with the MANUAL / TRACK

(1)

SEARCH FWD or REV keys so that the radial/tangential adjustment screws can be adjusted. Press the FINALIZE key, the PLAY key and the PAUSE key in the order to close the respective servos and put the player

(2)

into play mode. First, adjust the radial adjustment screw with the hexagonal screwdriver (1.27 mm) so that the eye pattern (the diamond

(3)

shape at the center of the RF signal) can be seen the most clearly and the amplitude is at maximum.. Next, adjust the tangential adjustment screw with the hexagonal screwdriver so that the eye pattern can be seen the most

(4)

clearly. (Fig. 17). Adjust in the order of the radial adjustment screw and the tangential screw again, so that the eye pattern can be seen the

(5)

most clearly. As necessary, adjust the two screws alternately so that the eye pattern can be seen the most clearly. After the adjustment, remove the float screw, turn over the servo mechanism assembly, then secure the radial adjustment screw and the tangential adjustment screw with loc-tite.

(6)

CR200

Stabilize each screw with an adhesive.

(Front side)

Hexagonal screwdriver

Radial adjustment screw

Tangential adjustment screw

(Rear side)

Fig. 16

CR200

Out of adjustment

4.2.8 Grating Re-adjustment

Optimum adjustment

Out of

adjustment

Optimum

adjustment

Fig. 17

Out of adjustment

Out of

adjustment

Adjust in the same manner as "4.2.4 Coarse Grating Adjustment ".

4.3 Adjustment 2

4.3.1 CD-R VCO Control Voltage Adjustment

• Objective To optimize the CD-R VCO control voltage adjustment of VCO IC.

• Symptom when out of adjustment The unit does not record or playback CD-R discs.

• Measurement instrument connections Multimeter to CN331, Pin-1 (VCOIN) (STRATEGY BOARD assy)

GND probe can be connected to CN331, Pin-2 (GND).

• Disc None needed

• Player state Test mode, stop

• Adjustment location VR301 (VCOIN) (STRATEGY BOARD assy)

[ Procedures ]

Adjust VR301 (VCO CON) so that the voltage at Pin 1 (VCOIN) of CN331 (TP30) becomes 2.5 ± 0.1V.(1)

4.3.2 Multi Pulse Time Adjustment

• Objective Pulse adjustment for recording (1)

• Symptom when out of adjustment The unit does not playback CD-R discs which was recorded with this player .

• Measurement instrument connections Oscilloscope to CN3506, Pin-6 (MPLS) (STRATEGY BOARD assy) GND probe can be connected to CN3506, Pin-1 (DGND). [ Settings ]: 1 V/div., 20 nS/div., DC mode

• Disc None needed

• Player state Test mode, stop

• Adjustment location VR3501 (MPLS DLY) (STRATEGY BOARD assy)

[ Procedures ]

Disconnect a connector CN3502 (white wires with green connector).

(1)

Adjust the time from rising edge to falling edge of Waveform with 2V level.

(2)

Adjust VR3501 (MPLS DLY) so that the DC voltage at CN3506 pin-6 (MPLS) becomes 70nS ± 3nS.

(3)

Press the STOP key.

(4)

Connect a connector CN3502.

(5)

CR200

GND

70nS ±3nS

4.3.3 EFM Rising Edge Time Adjustment

• Objective Pulse adjustment for recording (2)

• Symptom when out of adjustment The unit does not playback CD-R discs which was recorded with this player .

• Measurement instrument connections Oscilloscope to

CH1 : CN3506, Pin-5 (EFM IN) (STRATEGY BOARD assy) CH2 : CN3506, Pin-4 (SEFM) (STRATEGY BOARD assy)

GND probe can be connected to CN3506, Pin-1 (DGND). [ Settings ]

CH1 : 1 V/div. DC mode, 20 nS/div. CH2 : 1 V/div. DC mode

• Disc None needed

• Player state Test mode, recording power ON

• Adjustment location VR3502 (EFM DLY) (STRATEGY BOARD assy)

[ Procedures ]

Disconnect a connector CN3502.

(1)

Turn VR104 (REC. PW) fully counterclockwise to reduce the power to minimum.

(2)

Press RECORD and REC MUTE keys in the order to lights up the laser diode.

(3)

Adjust the time from rising edge of CN3506 pin 5 to rising edge of pin 4 of waveform

(4)

at the 2V level. Adjust VR3502 (EFM DLY) so that the delay becomes 80nS ± 3nS.

(5)

80nS ±3nS

CH1 CH2

GND

CR200

42nS ±3nS

CH1 CH2

GND

4.3.4 3T Rising Edge Time Adjustment

• Objective Pulse adjustment for recording (3)

• Symptom when out of adjustment The unit does not playback CD-R discs which was recorded with this player .

• Measurement instrument connections Oscilloscope to

CH1 : CN3506, Pin-3 (3T IN) (STRATEGY BOARD assy) CH2 : CN3506, Pin-2 (3T OUT) (STRATEGY BOARD assy)

GND probe can be connected to CN3506, Pin-1 (DGND). [ Settings ]

CH1 : 1 V/div., DC mode, 20 nS/div. CH2 : 1 V/div., DC mode

• Disc None needed

• Player state Test mode, recording power ON

• Adjustment location VR3503 (3T DLY) (STRATEGY BOARD assy)

[ Procedures ]

Disconnect a connector CN3502.

(1)

Turn VR104 (REC. PW) fully counterclockwise to reduce the power at minimum.

(2)

Press the RECORD and the REC MUTE keys in the order to lights up the laser

(3)

diode. Adjust the time from rising edge of CN3506 pin-3 to rising edge of pin 2 of waveform

(4)

with 2V level. Adjust VR3503 (3T DLY) so that the delay becomes 42nS ± 3nS.

(5)

Connect a connector CN3502.

(6)

4.3.5 WBL+ Offset Adjustment

• Objective To adjust the gain balance of the wobble signal.

• Symptom when out of adjustment The unit does not record or playback CD-R discs.

• Measurement instrument connections Oscilloscope to CN104, Pin-6 (RWBL) (HEAD BOARD assy)

GND probe can be connected to CN104, Pin-4 (AGND). [ Settings ]: 1 mV/div., 5 mS/div., DC mode

• Disc None needed

• Player state Test mode, stop

• Adjustment location VR107 (WBL+. OFS) (HEAD BOARD assy)

[ Procedures ]

Turn VR108 (WBL. OFS) to fully counterclockwise.

(1)

Adjust VR107 (WBL+. OFS) so that the DC voltage at CN104 (TP1), Pin-6 (RWBL) is Ð20mV ± 10mV.

(2)

4.3.6 Coarse WBL Offset Adjustment

• Objective To optimize the DC offset voltage of the wobble amp.

• Symptom when out of adjustment The unit does not record or playback CD-R discs.

• Measurement instrument connections Oscilloscope to CN104, Pin-5 (WBL) (HEAD BOARD assy) GND probe can be connected to CN104, Pin-4 (AGND). [ Settings ]: 1 mV/div., 5 mS/div., DC mode

• Disc None needed

• Player state Test mode, stop

• Adjustment location VR108 (WBL. OFS) (HEAD BOARD assy)

[ Procedures ]

Adjust VR108 (WBL. OFS) so that the DC voltage at Pin 5 (WBL) of CN104 (TP1) becomes 0 ± 10mV.(1)

4.3.7 RF Offset Adjustment

• Objective To optimize the DC offset voltage of the RF amp.

• Symptom when out of adjustment The unit does not playback..

• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy) GND probe can be connected to CN204, Pin-4 (AGND). [ Settings ]: 1 mV/div., 5 mS/div., DC mode

• Disc None needed

• Player state Test mode, stop

• Adjustment location VR121 (RF. OFS) (HEAD BOARD assy)

CR200

[ Procedures ]

Adjust VR121 (RF. OFS) so that the DC voltage at Pin 1 (RF) of CN204 (TP201) becomes 0 ± 10mV.(1)

4.3.8 Playback Power Re-adjustment

[ Procedures ]

Adjust in the same manner as "4.2.1. Playback Power Adjustment " in Adjustment 1.(1)

CR200

4.3.9 Coarse Focus Offset Adjustment

• Objective To optimize the DC offset voltage of the focus error amp.

• Symptom when out of adjustment The unit does not focus in and the RF signal is dirty.

• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy)

GND probe can be connected to CN204, Pin-4 (AGND). [ Settings ]: 20 mV/div., 2 mS/div., DC mode

• Disc TCD-785

• Player state Test mode, focus and spindle servos: closed, tracking servo: open

• Adjustment location VR105 (FE. OFS) (HEAD BOARD assy)

[ Procedures ]

Press the FINALIZE key and the PLAY key in the order to close the focus servo and then the spindle servo.

(1)

Adjust VR105 (FE. OFS) so that the amplitude of RF signal at CN204, Pin-1 (RF) is maximum.

(2)

Out of adjustment

Optimum adjustment

Fig. 18

4.3.10 Main and Sub Mix Ratio Adjustment

• Objective To mix the gain of the main signal output and sub signal output of the pickup.

• Symptom when out of adjustment The unit does not playback.

• Measurement instrument connections Oscilloscope to

CH1: CN104, Pin-1 (STE) (HEAD BOARD assy) CH2: CN104, Pin-2 (MSTE) (HEAD BOARD assy)

[These connections must be via low pass filters. ] GND probe can be connected to CN104, Pin-4 (AGND). [ Settings ]

CH1 : 50 mV/div. AC mode

10 mS/div. ADD mode

CH2 : 100 mV/diV. AC mode

• Disc TCD-785

• Player state Test mode, focus and spindle servos: closed, tracking servo: open

• Adjustment location VR110 (MS. MIX) (HEAD BOARD assy)

[ Procedures ]

Press the FINALIZE key and the PLAY key in the order to close the focus servo and then the spindle servo.

(1)

Set the oscilloscope to ADD mode (waveform adding mode of CH1 and CH2) and observe the adding waveform of CH1

(2)

and CH2. Adjust VR110 (MS. MIX) so that the amplitude of waveform becomes minimum.

(3)

+ 64 hidden pages