Jvc UXA 70 MD Service Manual 2

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UX-A70MD 1-2 Adjustment Method (CD/MD section) 1. Jigs and test instruments Laser power meter Laser power meter sensor (or disk sensor) Premastered disk (MRG-1018) Recordable disk 2. Adjustment and check items 1) Indications in the modes that all LCD's are on 2) CD section (1) Indication of the C1 error (2) Cancel of the C1 error indication 3) MD section (1) Setup of the TEST MODE 1 (2) Initialization of the EEPROM (3) Adjustment of the laser power (4) Adjustment of the disk (5) Setup of the TEST MODE 2 (6) Indication of variation in the pickup adjustment value (7) Indication of the C1 error (8) Cancel of the TEST MODE 3. Adjustment and check method 1) CD section (1) Indication of the C1 error (2) Cancel of the C1 error indication To cancel the C1 error indication, cut off the power supply. While pressing both the POWER key and BACK SKIP key on the main unit, turn on the primary power supply. FL indication CRC = 0 Press the CD OPEN/CLOSE key and insert the test disk. Press the CD PLAY key. The set starts counting and the number of error correction times is indicated every 10 seconds. 200 Hz or less FL indication CRC = ***

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UX-A70MD 1-3 2) MD section (1) Setup of the TEST MODE 1 While pressing both the POWER key and FORWARD SKIP key, turn on the primary power supply. FL indication TEST MODE 1 Setup is complete.(2) Initialization of the EEPROM (The EEPROM can be initialized on the precondition that the setup of the TEST MODE 1 is complete. After setup of the TEST MODE 1, proceed to the following operations with the remote controller*.) * For EJECT operation, use the EJECT key on the main unit. Initialization of the EEPROM Press the OPEN/CLOSE key on the main unit (3) Adjustment of the playback laser power(4) Adjustment of the recording laser power Set up the TEST MODE 1. Insert the laser power meter sensor. Press the "2" key on the remote controller. Set up the playback laser power. Increase the laser power with the F. SKIP key on the remote controller.Decrease the laser power with the B. SKIP key on the remote controller. Adjust the power to be 0.68 mW or more. If the value exceeds 0.68 mW, approximate it to 0.68 mW as accurately as possible. Press the MD EJECT key on the main unit. Setup of the MD laser power is complete.Set up the TEST MODE 1. Insert the laser power meter sensor. Press the "4" key on the remote controller. Set up the recording laser power. Increase the laser power with the F. SKIP key on the remote controller.Decrease the laser power with the B. SKIP key on the remote controller. Adjust the power to be 6.23 mW or more. If the value exceeds 6.23 mW, approximate it to 0.68 mW as accurately as possible. Press the MD EJECT key on the main unit. Setup of the MD laser power is complete. Press the PLAY MODE key on the remote controller. FL indication TEST MODE 1 Setup is complete. Press the STOP key on the remote controller. Press the STOP key on the remote controller. Press the STOP key on the remote controller. Press the STOP key on the remote controller. Press the STOP key on the remote controller.