Aiwa AMLM-918 Service manual

AM-LM918

SERVICE MANUAL

MINI DISC RECORDER

• This Service Manual is the “Revision Publishing” and replaces “Simple Manual” AM-LM918 (Y), (S/M Code No. 09-015-446-9T1).

• If requiring information about the MD mechanism, see Service Manual of

AZG-W YAF, (S/M Code No. 09-015-355-9N2).

BASIC MD MECHANISM : AZG-W YAF

S/M Code No. 09-016-446-9R1

REVISION

DATA

SPECIFICATIONS

<MD recorder section> Scanning method Non-contact optical scanner

Recording system Magnetic polarity modulation Rotation speed Approx. 400 to 900 rpm (CLV)

Sampling frequency 44.1 kHz No. of channels Stereo: 2 channels

A/D, D/A converter 1-bit Frequency 20 to 20000 Hz Wow and flutter Unmeasurable

<Input> AUX DIGITAL IN Sampling frequency: 48 kHz / 44.1 kHz / 32 kHz

CD DIGITAL IN

<General> Dimensions (W x H x D) 210 x 82.5 x 243 mm Weight 1.3 kg

• Design and specifications are subject to change without notice.

(Semiconductor laser application) overwrite system

Monaural: 1 channel

Optical input level: more than -21 dBm

ACCESSORIES / PACKAGE LIST

PART NO.

NO.

1 87-B30-024-010 CABLE,OPTICAL MC-901 1M

DESCRIPTIONREF. NO. KANRI

– 2 –

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

1 VEE

¡ TRK –

Pattern side

Solder

This set employs laser. Therefore, be sure to follow carefully the instructions below when servicing.

WARNING!!

WHEN SERVICING, DO NOT APPROACH THE LASER EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS NECESSARY TO CONFIRM LASER BEAM EMISSION. BE SURE TO OBSERVE FROM A DISTANCE OF MORE THAN 30cm FROM THE SURFACE OF THE OBJECTIVE LENS ON THE OPTICAL PICK-UP BLOCK.

s Caution: Invisible laser radiation when

open and interlocks defeated avoid exposure to beam.

s Advarsel: Usynlig laserståling ved åbning,

når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

VAROITUS!

Laiteen Käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saataa altistaa käyt-täjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.

VARNING!

Om apparaten används på annat sätt än vad som specificeras i denna bruksanvising, kan användaren utsättas för osynling laserstrålning, som överskrider gränsen för laserklass 1.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herin may result in hazardous radiation exposure.

ATTENTION

L’utillisation de commandes, réglages ou procédures autres que ceux spécifiés peut entraîner une dangereuse exposition aux radiations.

ADVARSEL

Usynlig laserståling ved åbning, når sikkerhedsafbrydereer ude af funktion. Undgå udsættelse for stråling.

This Compact Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the rear exterior.

CLASS 1 LASER PRODUCT KLASSE 1 LASER PRODUKT LUOKAN 1 LASER LAITE KLASS 1 LASER APPARAT

Precaution to replace Optical block

(KMS-260E)

Body or clothes electrostatic potential could

ruin laser diode in the optical block. Be sure

ground body and workbench, and use care the

clothes do not touch the diode.

1) After the connection, remove solder shown in right figure.

MD PICK-UP Assy PWB

– 3 –

ELECTRICAL MAIN PARTS LIST

PART NO. DESCRIPTIONREF. NO. KANRI

NO.

87-A20-870-010 IC,GP1F37R 87-A21-175-040 C-IC,TC74VHC14FT

TRANSISTOR

87-A30-087-080 C-FET,2SK2158 87-A30-484-080 C-TR,KRA102S 87-A30-490-080 C-TR,KRC107S 87-A30-447-040 CHIP-TR,DTA114EKA 89-333-266-080 CHIP TR,2SC3326B

MAIN C.B

C901 87-010-759-080 C-CAP,U, 0.1-25F C902 87-A12-061-080 CAP,E 47-10 SMG C903 87-012-274-080 CHIP CAP,U 1000P-50B C904 87-010-759-080 C-CAP,U, 0.1-25F C905 87-A12-061-080 CAP,E 47-10 SMG

C906 87-012-274-080 CHIP CAP,U 1000P-50B C907 87-010-759-080 C-CAP,U, 0.1-25F C908 87-012-195-080 C-CAP,U 100P-50CH C911 87-A12-064-080 CAP,E 1000-10 SMG C913 87-012-197-080 C-CAP,U 150P-50 J CH

C914 87-012-197-080 C-CAP,U 150P-50 J CH C915 87-010-757-080 C-CAP,U 0.047-25 Z F CN901 87-A61-580-010 CONN,18P V WHT 52328 CN902 87-A60-423-010 CONN,14P V TOC-B CN903 87-A60-422-010 CONN,8P V TOC-B

CN904 87-A60-586-010 CONN,4P V FE FB909 87-A50-189-080 C-COIL,S BLM21B272S FC902 8Z-CC3-607-010 FF-CABLE,14P 1.0 100MM FC903 8Z-CC3-608-010 FF-CABLE,8P 1.0 100MM JR902 87-005-840-080 C-COIL,S BLM21A10

DESCRIPTIONREF. NO. KANRI

PART NO.

NO.

FRONT C.B

CN905 87-A60-586-010 CONN,4P V FE CNA908 88-805-020-640 CONN ASSY,2P 60MM CNA909 88-805-021-090 CONN ASSY,2P FC905 88-904-261-110 FF-CABLE,4P 1.25 260MM S901 87-A90-696-080 SW,TACT TS2103-03-430

S902 87-A90-696-080 SW,TACT TS2103-03-430 S903 87-A90-696-080 SW,TACT TS2103-03-430 S904 87-A90-696-080 SW,TACT TS2103-03-430 S905 87-A90-696-080 SW,TACT TS2103-03-430 S906 87-A90-696-080 SW,TACT TS2103-03-430

S907 87-A90-696-080 SW,TACT TS2103-03-430 S908 87-A90-696-080 SW,TACT TS2103-03-430 S909 87-A90-696-080 SW,TACT TS2103-03-430 S910 87-A90-696-080 SW,TACT TS2103-03-430 S911 87-A90-696-080 SW,TACT TS2103-03-430

S912 87-A90-696-080 SW,TACT TS2103-03-430

LED-L C.B

C910 87-012-286-080 CAP, U 0.01-25 CN907 87-A60-619-010 CONN,2P V 2MM JMT D901 87-A40-640-010 LED,SELU1E10CXM BLUE-EF

LED-R C.B

C909 87-012-286-080 CAP, U 0.01-25 CN906 87-A60-619-010 CONN,2P V 2MM JMT D902 87-A40-640-010 LED,SELU1E10CXM BLUE-EF

CHIP RESISTOR PART CODE

Chip Resistor Part Coding

Resistor Code

Chip resistor

Wattage Type Tolerance 1/16W 1005 5% CJ

1/16W 1/10W

1/8W

1608 2125

3216

5% 5%

Symbol

CJ CJ

Figure

Value of resistor

Form

Dimensions (mm)

0.55

Resistor Code

108 118

128

LW t

1.0 0.5 0.35 104

1.6 0.8 0.45 2 1.25 0.45

3.2

1.6

: A : A

– 4 –

TRANSISTOR ILLUSTRATION

2SK2158

2SC3326B DTA114EKA KRA102S KRC107S

– 5 –

WIRING (MAIN / FRONT / LED – L / LED – R)

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

– 6 –

SCHEMATIC DIAGRAM (MAIN / FRONT / LED – L / LED – R)

– 7 –

MD TEST MODE

The following shows the contents of the test mode.

1. How to Activate MD Test Mode

2. MD Test Mode and Audio Output Check

3. How to Cancel MD Test Mode

4. How to Change to Servo Standby Mode

5. Sled Feed Operation Check

6. Laser Power Check

7. Loading Mechanism Operation and Detection Switch Check

8. Servo Operation Check

8-1 Focus Search/Spindle Kick Check 1

8-2 Focus Search/Spindle Kick Check 2 (S curve check)

8-3 Focus Servo and Sled Error (EF Balance) Check

8-4 All Servo On Check

9. Address, Error Rate Check

10. How to Erase U-TOC (User TOC)

1. How to Activate MD Test Mode

While pressing and holding the “PLAY” button on the MD section, insert the AC plug into the outlet.

* Notes: 1) The button operation in test mode is basically performed at MD section but it can also be done at TUNER section, AMP section and

CD section. The remote controller is also required for the adjustments.

2) During test mode activation, perform the operation and any mechanical error is ignored. If an unusual error occurs in the operation,

switch off the power immediately.

3) During test mode operation, normal recording/ playback will not be working.

2. MD Test Mode and Audio Output Check

1) After activating test mode, the display will be as shown in the diagram below, indicating that test mode can be used.

2) Audio Output Check

The signal of 1kHz, –17dB (140mV) is the output from the MD mechanical output (D/A OUT).

(It cannot output from the speaker output and headphone output.)

3. How to Cancel MD Test Mode

1) Press the “MD EJECT” button and take out the DISC.

2) Remove the AC plug.

* Note: If the MD test mode is cancelled without using the above steps, the unit may not be able to operate properly when power is switched on

again. If this occurs, remove the AC plug.

4. How to Change to Servo Standby Mode

After activating the test mode, press the “STOP” button to change to Servo Standby mode.

Various modes are able to switch from this mode (display shows “ALL SV OFF”).

Press the “STOP” button in each mode operation to return to “ALL SV OFF” that is returns to the original display.

5. Sled Feed Operation Check

In “ALL SV OFF”, press the “B.SKIP” or “F.SKIP” button to move the lens and PICK UP to outer or inner track respectively.

PICK UP moves to the inner most track and the “JAZZ” lights up when “INSIDE LIMIT SW” is pressed.

* Make sure that checking is in loading mode because the range of movement allowable for PICK UP is restricted when unloading.

PICK UP moves to outer track. PICK UP moves to inner track

– 8 –

6. Laser Power Check

1) IN “ALL SV OFF”, laser power status changes each time the “MD EDIT/REC” button is pressed. The display changes as shown in the

following diagrams.

“ALL SV OFF”: Laser Off

“LASER READ”: Laser Read Power (approximately 0.68mW)

“ LASER 1/2”: Laser 1/2 Read Power (approximately 0.34mW)

“LASER WRITE”: Laser Write Power (approximately 6.8mW)

2) After checking, press “STOP” or “MD EDIT/REC” button to return to “ALL SV OFF” display.

7. Loading Mechanism Operation and Detection Switch Check

7-1 Loading Mechanism Operation Check

In “ALL SV OFF”, insert the MO DISC, press the “NORMAL” button of CD MD SYNC REC or “MD EJECT” button to UP/DOWN

the OWH.

“MD EJECT” button: OWH UP (during loading)/unloading

There is no change in the display.

* Cautions: 1) When a pre-mastered disc such as test disc (TGYS-1) or soft disc is inserted, do not press DOWN for OWH.

7-2 Detection Switch Check

REFLECT SW, REC PROTECT SW, INSIDE LIMIT SW, Disc Mode (PIT, MO) selections will be shown on the display.

MD SYNC REC “NORMAL” button: OWH DOWN (during loading)

2) When unloading, do not press the “CD

MD SYNCHRO REC NORMAL” button. Damage may be occurred.

“JAZZ” is lit: INSIDE LIMIT SW is turned on.

PICK-UP is in inner most track position.

“POP” is lit : REFLECT SW is turned on.

When a high reflectivity DISC is inserted (such as TEST DISC).

“ROCK” is lit: REC PROTECT SW is turned on.

When MO DISC is inserted (REC PROTECT).

“TIME MARK” is lit: DISC MODE PIT selection.

“AUTO MARK” is lit: DISC MODE GRV selection.

8. Servo Operation Check

8-1 Focus Search/Spindle Kick Check 1

1) In “ALL SV OFF” with no DISC inserted, press the “PLAY” button to change to focus search and spindle kick modes. “FOCUS SRCH”

appears on the display.

2) After the checking, press “STOP” button to return to “ALL SV OFF” display.

– 9 –

8-2 Focus Search/Spindle Kick Check 2 (S curve check)

1) In “ALL SV OFF”, press the “BAND” button on tuner section to change to focus search and spindle kick modes. At this time, “FOCUS

CHECK” appears on the display. This mode can operate repeatedly regardless of DISC existence and S curve can be checked with DISC in

this mode.

2) After checking, press the “STOP” button to return to “ALL SV OFF” display.

8-3 Focus Servo and Sled Error (EF Balance) Check

1) Insert the DISC.

2) Press the “MD MODE” button to choose the DISC mode as shown in the following.

• PIT DISC: Display shows “SELECT PIT” • MO DISC: Display shows “SELECT GRV”

3) Press the “PLAY” button.

During normal focus search, the display shows “FOCUS SRCH” followed by “FOCUS ON!” which indicates that focus search is turned on.

4) In “FOCUS ON!”, press the “DISPLAY” button on tuner section to show “S.ERR = **” on the display. This mode can check on DC offset of

EF balance.

S.ERR: Sled Error (EF balance, DC offset)

It is normal if it changes in a range of 70-89 where 80 is the centre.

5) After checking, press the “STOP” button to return to “ALL SV OFF” display.

8-4 All Servo On Check

1) In “FOCUS ON!” mode, press the “ENTER” button on amp section to turn on tracking sled servo and all the servo are activated.

If all the servo are normal, the display will show “ALL SV ON”.

2) After checking, press the “STOP” button to return to “ALL SV OFF” display.

– 10 –

9. Address, Error Rate Check

1) In “ALL SV ON” mode, press the “DISPLAY” button on tuner section to check for the address and error rate.

Address Display: displays the address read by All Servo On

Error Rate Display: displays the 4 digits on the left as error rate

(digits below 0030 is normal)

Focus Bias: Fixed at “FBIAS = 00”

2) Refer to the adjustment section for checking the recording/playback error.

10. How to Erase U-TOC (User TOC)

Make the DISC that appears on display from “U-TOC ERROR” to “BLANK DISC”.

1) Insert the MO DISC.

2) Press the “MD MODE” button to change the display to “SELECT GRV”.

3) Move the PICK UP to the centre position of the DISC with “B.SKIP” or “F.SKIP” button.

4) Press the “PLAY” button to change the display to “FOCUS ON!”.

5) Press the “ENTER” button on the AMP section to change the display to “ALL SV ON”

6) Press the “JOG MODE” button on the AMP section and the display becomes “UTOC ERASE”.

7) U-TOC is erased when “ALL SV OFF” appears on the display.

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+ 25 hidden pages