Yamaha MDX-9 Service Manual download pdf (Page 14)

MDX-596

● Forced rotation of loading motor

It is possible to force the loading motor to rotate by turning the jog dial when the microprocessor version (tsm1C**e**)

of the test mode or EJECT appears on display. (This is used when the disc cannot be ejected.)

JOG DIAL y : Forced feeding of the disc to EJECT

JOG DIAL t : Forced feeding of the disc to LOAD

* To obtain the microprocessor version on display when a disc is loaded, “ AUTO _ AJST _ ” appears on display. Press

the DELETE/CANCEL key in this state, and the microprocessor version will appear.

●

Lead-in switch position adjustment

Adjust the lead-in switch position so that it is between FF85 and FFD2.

1. Load a TDYS1 (SONY) (P/No. TX945850) disc for reproduction.

2. Loosen the screw (A1) (1 pc) attaching the mechanical switch P.C.B.

3. Retighten the screw (A1) (1 pc) while pressing the mechanical switch P.C.B in the arrow A direction in the figure for

FF85 or less and in the arrow B direction for FFD2 or more.

Measure the lead-in switch position again and check that it is in the range between FF85 and FFD2.

Fig.8

Note) Apply thread lock to the screw (A1) (1 pc) of

the P.C.B. after tightening it.

● Confirmation of magnetic head installation position

• After replacing the magnetic head and the optical pick-up, be

sure to confirm their installation positions.

• To facilitate adjustment of their installation positions, bring the

optical pick-up to the center position and follow the procedure

described below.

1.Load a clear disc (P/No. AAX18050) for checking the head.

2.Push down the up-shift arm of the magnetic head with a finger to

raise the magnetic head.

3.Looking at the unit from above, check if the magnetic head

matches with the optical pick-up objective lens.

4.Check to ensure that the magnetic head moves up and down

smoothly.

(A1) X1

Magnetic head

Circumferentical direction

Objective lens

Radial direction

Push down with a finger.

Fig.9

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 58 59

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Yamaha MDX-9 Service Manual Page 14