Sony TCM-50DV Service Manual page 26

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1. Changes to the Board
As the motor is changed, the main board is to be changed from the board with the suffix No.-11 or -12 to the board with No.-21.
When only replacing the motor or main board by a new part, replace the appropriate components on the main board.
(For details, refer to "2. Replacing the Board/Motor" on page 4.)
1-1. Printed Wiring Board (page 13)
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