Yamaha MCR-B043 Service Manual page 3

Laser Emitting conditions:
1) When the Top Cover is removed, and the STANDBY/ON SW is turned to the "ON" position, the laser component will
emit a beam for several seconds to detect if a disc is present. During this time (5-10 sec.) the laser may radiate
through the lens of the laser pick-up unit. Do not attempt any servicing during this period!
If no disc is detected, the laser will stop emitting the beam. When a disc is loaded, you will not be exposed to any
laser emissions.
2) The laser power level can be adjusted with the VR on the pick-up PWB, however, this level has been set by the factory
prior to shipping from the factory. Do not adjust this laser level control unless instruction is provided elsewhere in this
manual. Adjustment of this control can increase the laser emission level from the device.
Laser Diode Properties
Type: Semiconductor laser GaAS/GaAlAs
Wave length: 790 nm
T model
U, T, K, A, B, G, L, S, H, J models
V model
Warning for power supply
The primary side of the power supply carries live mains voltage when the player is connected to the mains even
when the player is switched off !
This primary area is not shielded so it is possible to accidentally touch copper tracks and/or components when servicing
the player.
Service personnel have to take precautions to prevent touching this area or components in this area.
Note:
The screws on the Loader mechanism may never be touched, removed or re-adjusted.
Handle the Loader mechanism with care when the unit has to be exchanged!
The Loader mechanism is very sensitive for dropping or giving shocks.
MCR-B043/MCR-B043D/NS-BP83
Output Power: 7 mW
*
The new loader mechanism unit has no LASER CAUTION label
attached.
When replacing the loader mechanism unit with a new one, reattach
the LASER CAUTION label from the old unit to the new unit.
※ 新しいローダーメカユニッ トには LASER CAUTION ラベルが貼りつけら
れていません。
新しいローダーメカユニッ トに交換する場合、LASER CAUTION ラベル
も貼り直してください。
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