Sony MZ-R90/R91, MT-MZR70-165 Section Servicing Note, Notes On Laser Diode Emission Check

SECTION 1

SERVICING NOTE

•When repairing this device with the power on, if you remove the MAIN board or open the upper panel assy, this device stops working.

In this case, you can work without the device stopping by fas- tening the hook of the open/close detect switch (S801) with tape.

Tape

MAIN board

S801

•This set is designed to perform automatic adjustment for each adjustment and write its value to EEPROM. Therefore, when EEPROM (IC802) has been replaced in service, be sure to per- form automatic adjustment and write resultant values to the new

EEPROM.

(Refer to page 20.)

•Replacement of CXD2660R (IC502) and CXR701081 (IC801) used in this set requires a special tool. Therefore, they cannot be replaced.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body.

During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts.

The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

Never look into the laser diode emission from right avove when checking it for adustment. It is feared that you will lose your sight.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-2R)

The laser diode in the optical pick-up block may suffer electrostatic break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform measures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled with care.

laser-tap

OPTICAL PICK-UP FLEXIBLE BOARD

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