AIWA LCXMD211 - Service Manual Immediate Download

SERVICE MANUAL

MD / CD

STEREO SYSTEM

BASIC TAPE MECHANISM : TN-21ZSC-2003

BASIC CD MECHANISM : DA11T3C

BASIC MD MECHANISM : AZG-4 A

LCX-MD211 EZ

S/M Code No. 09-00B-429-4S2

SUPPLEMENT

· This Service Manual contains the additional information "TEST MODE",

"ADJUSTMENT", "IC BLOCK DIAGRAM", "IC DESCRIPTION",

"LCD DISPLAY" and "VOLTAGE" for the model LCX-MD211(EZ).

If requiring the other information, see Service Manual of LCX-MD211(EZ),

(S/M code No.09-007-429-4R2).

LCXMD211

SYSTEM

SPEAKER

SX-MD210

REMOTE

CONTROLLER

RC-AAT11

TEST MODE

1-1 How to activate CD Test Mode

Insert the AC plug while pressing the "CD function" button.

Test mode will be activated and [CD TEST] will be appeared in the LCD display.

Note: Test mode can not be activated when CD door switch is opened.

1-2 CD Test Mode Functions

CD TEST MODE

* Note 1: There are cases when CD cannot be operated owing to the protection circuit being operated when heat builds up in the driver IC if the

focus search is operated continually for more than 10 minutes. In this case, the power supply should be switched off for ten minutes

until heat has been reduced and then re-start.

1-3 How to cancel CD Test Mode

Either one of the following operations will cancel the CD test mode.

· Open the CD door switch.

· Press "POWER" button.

· Disconnect the AC plug.

LCD TEST MODE

1-1 How to activate LCD Test Mode

Insert the AC plug while pressing the "DISPLAY" button.

LCD display is fully illuminated and then all segments are lit on and off every one second.

1-2 How to cancel LCD Test Mode

LCD test mode will cancel by press "POWER" button or disconnect the plug.

Start Mode

Display

Search Mode

Continuous Focus Search (Pickup lens

repeat full swing)

* Note 1

Activate CD

Test Mode

CD TEST

Function

Mode

Operation

Content

Play Mode

PLAY

· Normal Playback

· When TOC READ is unavailable,

continuous Focus Search (Same as

Search Mode Operation)

· Focus servo

· Tracking servo

· CLV servo

· Sled servo

Traverse Mode

TRAVERS

Tuner Function

Button

Playback pause status

Tracking servo OFF

Sled Mode

SLED IN

SLED OUT

· Shift to the internal circumference of

pickup

· Shft to the external circumference of

pickup

· Sled servo

· Mecha operation check

· APC circuit check

· Laser current measurement

· Focus error waveform check

MD TEST MODE

1-1 How to start up MD Test Mode

Insert the AC plug while pressing the "MD function" button.

After the MD test mode has started up, [MD TEST] message appears and the test mode becomes operatable.

Note: · Disconnect the AC plug immediately if any mechanism abnormalities.

· Playback and recording are not possible during the test mode.

1-2 How to cancel MD Test Mode

1) Press the "MD EJECT" button and remove the disc.

2) Disconnect the AC plug or press "POWER" button.

1-3 Operation Check Mode

1) Checks after the test mode has started up.

The following playback audio circuits can be checked.

· Enable circuit to check ------------ DAC, LINEAMP, HEADPHONE AMP

· Output level ------------------------- 1KHz, -24dB

2) Switch status check

ON/OFF statuses of main unit and mechanism switches can be checked on display.

1-4 How to switch to Servo Standby Mode

When the test mode has been established, the mode changes to the servo standby mode by pressing "s" button (lndication on display : ALL

SVOFF).

The various check modes can be entered from this mode.

Pressing the "s" button during each operation returns to [ALL SVOFF].

1-5 Checking Sled Operation

1) When "g" button is pressed in the [ALL SVOFF] state, pickup moves in the outer direction. [T SLEDFWD] is displayed.

2) When "g" button is pressed in the [ALL SVOFF] state, pickup moves in the inner direction. [T SLEDRVS] is displayed.

1-6 Checking Laser Power

1) The laser power is switched each time the "EDIT" button is pressed in the "ALL SVOFF" state. Laser power output is changed as

OFFbLASER READbLASER 1/2bLASER WRITEbOFF order and indication on the display is follows;

OFF

Indication on display

LASER 1/2 WRITE

Mode

LASER READ

LASER WRITE

ALL SVOFF

LA READ

LA 1/2

LA WRITE

2) Press "s" button to return the display to [ALL SVOFF] after checking.

1-7 Checking OWH (Over Write Head) Operation

The operation of OWH can be checked by pressing following buttons in the loading status.

"MD EJECT" button-----------------------OWH UP

"SYNCHRO REC" button----------------OWH DOWN

* Note: Do not down OWH when using the high reflection disc (CD).

1-8 Checking Servo Operation

· Checking the focus search and spindle kick 1

1) When "E" button is pressed in the [ALL SVOFF] state without disc, focus search and spindle kick are executed continuously.

[

FOCUS SCH] is displayed.

REC PROTECT

Switch state

REFRECT

When the high reflection disc (CD) is

used.

TOC EDIT

Switch name

Indication on Display

Usalde disc

MD REC

INNER

MONO

Playback only disc

When the write-protection tab of disc is

stopped.

When the pickup is the positioned at the

innermost track (when the LIMIT SW is

ON).

Record/playback disc

2) Press "s" button to display [ALL SVOFF] after checking

· Checking the focus search and spendle kick 2

1) When "TUNER function" button is pressed in the "ALL SVOFF" state regardless disc existence, focus search and spindle kick are executed

continuously. [FOCUS CHK] is displayed and S curve can be checked if disc is loaded.

2) Press "s" button to display [ALL SVOFF] after checking.

· Checking Focus Servo

1) Insert a test disc.

2) Move pickup to center track by pressing "g" or "f" buttons.

3) Press "JOG MODE" button to set the servo mode according to the inserted disc as follows;

· MO disc (MO)----------------Indication on display [SEL GRV].

· PIT disc (CD)-----------------Indication on display [SEL PIT].

4) Press "E" button.

If focus servo is operating normally, the messge [FOCUS ON] is displayed after [FOCUS SCH].

5) Press "s" button to display [ALL SVOFF] after checking.

· Checking all Servos are turned on.

1) Tracking and sled servos and turned on and all servos work when "ENTER" button is pressed in the [FOCUS ON!] state. [ALL SV ON] is

displayed if all servos are normal.

2) Press "s" button to display [ALL SVOFF] after checking.

ADJUSTMENT <TUNER / DECK>

TP4 (VT)

FFE801

L981

IC721

TP7(Rch)

C786

TP8(Lch)

C785

TP6

TP5

IC771

L772

L771

IC201

IC202

J201

MAIN C.B

L941

L942

TC942

< TUNER SECTION >

1. MW VT Check

Settings :

· Test point : TP4 (VT)

Method :

Set to MW 1602kHz and check that the test point is

less than 5.6V.

2. MW Tracking Adjustment

Settings :

· Test point : TP7 (RCH), TP8 (LCH)

· Adjustment location : L981

Method :

Set to MW 999kHz and adjust L981so that the test

point becomes maximum.

3. AM IF Adjustment

Settings :

· Test point : TP7 (RCH), TP8 (LCH)

· Adjustment location:

L772 .................................................... 450kHz

4. LW VT Adjustment

Settings :

· Test point : TP4 (VT)

· Adjustment location : L942

Method :

Set to LW 153kHz and adjust L942 so that the test

point becomes 1.3V

± 0.05V.

5. LW Tracking Adjustment

Settings :

· Test point : TP7 (RCH), TP8 (LCH)

· Adjustment location :

L941 .................................................... 153kHz

TC942 .................................................. 285kHz

Method :

Set up TC942 to center before adjustment. The level at

153kHz is adjusted to maxinum by L941. Then the

level at 285kHz is adjusted to maxinum by TC942.

6. FM VT Check

Settings :

· Test point : TP4 (VT)

Method :

Set to FM 108MHz and check that the test point is less

than 8.2V .Then set to FM 87.5MHz and check that

the test poit is more than 1.5V.

7. FM Tracking Check

Settings :

· Test point : TP7 (RCH), TP8 (LCH)

Method :

Set to FM 98MHz and check that the test point is less

than 18dB.

8. DC Balance / Mono Distortion Adjustment

Settings : · Test point : TP5, TP6 (DC balance)

TP7 (RCH), TP8(LCH)(Distortion)

· Adjustment location : L771

· Input level : 54dB

Method :

Set to FM 98MHz and adjust L771 so that the voltage

between TP3 and TP4 becomes 0V

± 0.04V.

Next, check that the distortion is less than 1.5%.

9. FM Separation Check

Settings :

· Test point : PHONE JACK (J201)

· Input level : 54dB

Method :

Set to FM 98MHz and check that the test point is more

than 20dB.

< DECK SECTION >

10. Head Azimuth Adjustment

Settings :

· Test tape : TTA330

· Test point : PHONE JACK (J201)

· Adjustment location : Head azimuth

adjustment screw

Method :

1) Connect the L positive terminal to CH1 probe

(positive side) of oscilloscope and L negative

terminal to CH1 probe (negative side).

Connect the R positive and negative terminals to

CH2 probe same condition as CH1 probe.

2) Play back the 10kHz signal of the test tape.

3) Adjust the head azimuth adjustment screw to

become maximum waveform in the oscilloscope

and same phase for CH1 and CH2.