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The manual describes this product very good. It has the basic things to know and also a more detailed look. Very well made!
An excellent document to assist in the repair of my old personal tape player. It includes full circuit diagrams and physical layout drawings and full instructions on disassembly and fault finding.
Well worth the meagre price.
Very good conversation, Pretty fast Service, wood do it again,
Have paid by Paypal, so i got the Service Manual online after 15 Min.
Greeting from Germany,
Good-quality scans. Detailed description. I hope I can repair the machine.
High-quality scanning. Detailed description. Recommend for all technician. A+++
Maintenance of MD pickup
1. Cleaning of pickup lens
(1) Prior to changing the pickup, clean the pickup lens. (2) For cleaning the lens, use the following cotton swab after mearsing it in alcohol. Product No. JCB-B4; Manufacturer;Nippon Cotton Swab
Procedures of changing the MD pickup
Change the MD pickup by referring to "Removing the MD pickup" in the Disassembly method.
2. Confirmation of the service life of laser diode when the service life of the laser diode has been exhausted, the following symptoms will appear.
(1) The RF output (EFM output and eye pattern amplitude) will become lower. (2) The drive current required for light emitting of laser diode will be increased.
Set the pickup to [TEST] mode according to the procedures described in the Adjustment method.
Adjust the laser power 560 W.
Power supply voltage 1.5V
Adjust the disc. Confirm the service life according to the following flow chart: Completion of changing the MD pickup.
Can the laser power adjust under test mode?
Change the pickup
Is the drive current of laser diode 55mA or less?
Change the pickup
Be sure to perform not only adjustment and operation of this system so carefully as not to directly look at the laser beam or touch on the body.
3. Method of measuring the drive current of laser diode
When the voltage measured at the both side of carbon resistor R301 on the MD servo P.C. board (LVB20008) have become 12.1mV or over, the service life of the laser diode is judged to have been exhausted.
4. About Semi-solid state resistor of pick up
This is adjusted in the maker of pick up . Be careful please not to touch pick up .