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Aiwa AM-LM918 Service Manual

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AM-LM918
Y
SERVICE MANUAL
MINI DISC RECORDER
BASIC MD MECHANISM : AZG-W YAF
• 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).
S/M Code No. 09-016-446-9R1

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Summary of Contents for Aiwa AM-LM918

  • Page 1 BASIC MD MECHANISM : AZG-W YAF • 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).

  • Page 2: Specifications

    SPECIFICATIONS <MD recorder section> Scanning method Non-contact optical scanner (Semiconductor laser application) Recording system Magnetic polarity modulation overwrite system Rotation speed Approx. 400 to 900 rpm (CLV) Sampling frequency 44.1 kHz No. of channels Stereo: 2 channels Monaural: 1 channel A/D, D/A converter 1-bit Frequency...

  • Page 3: Protection Of Eyes From Laser Beam During Servicing

    PROTECTION OF EYES FROM LASER BEAM DURING SERVICING CAUTION This set employs laser. Therefore, be sure to follow carefully the instructions below when servicing. Use of controls or adjustments or performance of procedures other than those specified herin may result in hazardous radiation WARNING!! exposure.

  • Page 4: Electrical Main Parts List

    ELECTRICAL MAIN PARTS LIST REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION FRONT C.B 87-A20-870-010 IC,GP1F37R CN905 87-A60-586-010 CONN,4P V FE 87-A21-175-040 C-IC,TC74VHC14FT 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 TRANSISTOR S901 87-A90-696-080...

  • Page 5: Transistor Illustration

    TRANSISTOR ILLUSTRATION 2SK2158 2SC3326B DTA114EKA KRA102S KRC107S – 5 –...
  • Page 6 WIRING (MAIN / FRONT / LED – L / LED – R) – 6 –...
  • Page 7 SCHEMATIC DIAGRAM (MAIN / FRONT / LED – L / LED – R) – 7 –...

  • Page 8: Md Test Mode

    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.
  • Page 9 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) “...
  • Page 10 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.
  • Page 11 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”...

  • Page 12: Electrical Adjustment

    ELECTRICAL ADJUSTMENT MD Electrical Adjustment Perform all MD block adjustments and checking in test mode. When “NO ADJUST” appears on the display, perform all the adjustments. Measuring Device and Tools Attached Remote Controller Temperature indicator (Degree Celsius), Laser Power meter (available to measure up to 10mW) Test DISC: TGYS-1 or TDYS-1 (or soft disc), MDW-74 (or similar product) Before Adjustment Use a DISC that is not scratched or contaminated for the adjustment.
  • Page 13 Adjustment Procedure Flow Chart START Activate TEST MODE Press and hold the “PLAY” button on the MD section and insert the AC plug into the outlet. EEPROM Initialisation “OPEN/CLOSE” the CD section “STOP” To next step – 13 –...
  • Page 14 Importance of this adjustment is Temperature Compensation that board temperature and room Adjustment temperature are the same. “DISPLAY” on TUNER section “PAUSE” Temperature Compensation Adjustment Using the temperature indicator (Degree Celsius), compare the surrounding temperature of the MD mechanism measured on the display with the temperature indicator, (temperature indicator displays –...
  • Page 15 Laser Power Check Read Power Check Write Power Check “MD EDIT/REC” Press “MD EDIT/REC” twice. “PAUSE” “PAUSE” Read Power Setup Value Check Write Power Setup Value Check Check that “LASER= OF” is displayed Check that “LASER= 89” is displayed “ENTER” on AMP section “ENTER”...
  • Page 16 AUTO SEQUENCE ADJ MO DISC Adjustment Value Check MO DISC Adjustment “PLAY” MDW-74 (or similar product) Loading “ENTER” on AMP section “MD MODE” “STOP” AUTO MARK is lit Press “DISPLAY” on TUNER section twice Adjustment Value Check (IVR, EF balance) Remote Controller “MD”...
  • Page 17 AUTO SEQUENCE ADJ (continued) PIT DISC Adjustment PIT DISC Adjustment Value Check “STOP” TGYS-1 or TDYS-1 loading Press “DISPLAY” on TUNER section twice “MD MODE” Adjustment Value Check (IVR, EF balance) “TIME MARK” is lit EF Balance Value Check 09-15 (Hexadecimal) Remote Controller “MD”...
  • Page 18 Error Rate Check Playback Error Rate Check Address Display TGYS-1 or TDYS-1 Loading “MD MODE” “DISPLAY” on TUNER section “TIME MARK” is lit Playback Error Check “B.SKIP” “F.SKIP” Below 0030 PICK UP moves to the centre position of DISC “STOP” Remote Controller “AUX”...
  • Page 19 Error Rate Check (continued) Recording/Playback Error Rate Check MDW-74 (or similar product) loading “DISPLAY” on TUNER section “B.SKIP” “F.SKIP” once 600C is exceeded PICK UP moves to the centre position of DISC Record Error Check “PLAY” on CD section Address display Automatically begins recording from 600C Below 0030 “STOP”...
  • Page 20 After Adjustment Check Press “POWER” twice and check that “NO ADJUST” is not displayed when the power is switched on. – 20 –...
  • Page 21 MECHANICAL EXPLODED VIEW 1 / 1 AZG-W YAF WIRE,ASSY CHAS,MAIN – 21 –...

  • Page 22: Mechanical Parts List

    MECHANICAL PARTS LIST 1 / 1 REF. NO. PART NO. KANRI DESCRIPTION 1 8B-CC1-002-010 PANEL,MD 2 8Z-CC3-007-010 BADGE,AIWA 27.5 ABS SIL 3 8B-CC1-001-010 CABI,FR MD 4 8B-CC1-201-010 GUIDE,MD 5 88-CE2-209-010 SPR-T,MD 6 8B-CE1-018-010 REFLECTOR,FR 7 8Z-CE3-204-010 GUIDE,LED R 8 8B-CE1-208-010...
  • Page 23 2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110, JAPAN TEL:03 (3827) 3111 9301978 2000041 921338 Printed in Singapore...
  • Page 24 AM-LM918 SERVICE MANUAL MINI DISC RECORDER BASIC MD MECHANISM : AZG-W YAF • Replace this Service manual with “Revision Publishing” when it is issued. S/M Code No. 09-015-446-9T1...

  • Page 25: Parts List

    X APPERANCE DU 8B-CF1-008-010 -- CHAS,MAIN TU/MD AM-LM918 O APPERANCE DU 8B-CF1-011-010 -- PANEL,TOP AM-LM918 O APPERANCE DU 8Z-CC3-007-010 0E BADGE,AIWA 27.5 ABS SIL AM-LM918 ! O CB MECHA 8Z-CE3-203-010 0E GUIDE,LED L AM-LM918 ! O CB MECHA 8Z-CE3-204-010 0E GUIDE,LED R...
  • Page 26 PARTS CODE K NO. DESCRIPTION SUFFIX MODEL NAME O OTHERS CN 0906 87-A60-619-010 0E CONN,2P V 2MM JMT AM-LM918 O OTHERS CN 0907 87-A60-619-010 0E CONN,2P V 2MM JMT AM-LM918 O OTHERS CNA0908 88-805-020-790 0E CONN ASSY,2P 70MM AM-LM918 O OTHERS...
  • Page 27 Components marked X and R are not designated as spare parts for after sales service, and will not be stocked at the spare parts centers. K NO. = Only use japanese. UNIT NAME REF NO. PARTS CODE K NO. DESCRIPTION SUFFIX MODEL NAME O SCREW 87-B10-294-010 0E BVT2+2.6-8 AM-LM918 – 4 –...
  • Page 28 PARTS LIST <AZG-W > = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
  • Page 29 PARTS LIST <AZG-W > = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
  • Page 30 PARTS LIST <AZG-W > = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
  • Page 31 PARTS LIST <AZG-W > = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
  • Page 32 PARTS LIST <AZG-W > = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
  • Page 33 PARTS LIST <AZG-W > = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
  • Page 34 SCHEMATIC DIAGRAM – 1 (MAIN)
  • Page 35 SCHEMATIC DIAGRAM – 2 (MD : AZG-W YAF)
  • Page 36 2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110, JAPAN TEL:03 (3827) 3111 9301978 Printed in Singapore...

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