Yamaha GX-500 Service Manual download pdf (Page 35)

GX-900

● Forced rotation of loading motor

It is possible to force the loading motor to rotate by turning the jog dial when the microprocessor version (tsm13**e**)

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

* To obtain the microprocessor version on display When a disc is loaded, “ _ AUT _ YOBI _ ” appears on display. Press

the CHARACTER key in this state, and the microprocessor version will appear.

●

Lead-in switch position measurement mode

Load a TDYS1 disc for reproduction (high reflecting disc).

Note) Adjust the position of the lead-in switch to FF85 ~ FFD2.

1. Loosen 2 screws (A) fixing the mechanism switch P.C.B.

2. Retighten screws while pushing the mechanism switch P.C.B. in the arrow (<-) direction and then measure the

position of the lead-in switch again. After adjusting the position, tighten 2 screws (A) securely. (Fig.25)

Fig.25

Loosen 2 screws (A)

Lead-in switch

Mechanism SW P.C.B.

Note) Apply thread lock to 2 screws on the

P.C.B. after tightening them.

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

raise the magnetic head.

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

matches with the optical pick-up objective lens.

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

smoothly.

Push down with a finger.

Magnetic head

Circumferentical direction

Objective lens

Radial direction

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Yamaha GX-500 Service Manual Page 35