Yamaha MDX-9 Service Manual download pdf (Page 11)

MDX-596

● Confirmation of pick-up laser power

Recording and reproduction can be checked by using the laser power meter. However it should be

used for checking only because there is variation in its measurement.

When the measured value is excessively deviated from the reference value, replace the pick-up.

Reference value (measured at room temperature of 25 °C)

During reproduction (ppw) : 0.72 ± 0.1 mW

During recording : 5.5 ± 0.5 mW

Note :Be very careful when using the laser power meter. The laser beam would cause damage to

your eye if exposed to it directly.

● TEMP (temperature standard) setting

(Make this setting quickly when the room temperature is within the range of 21 ˚C to 29 ˚C and

the P.C.B. is cold.)

(1) Set to the TEMP setting mode menu.

[ TEMP ❍ ❍ ◆ ◆ ]

❍ ❍ : Temperature measured value

◆ ◆ : Temperature setting value

(2) Make temperature correction based on the ambient temperature and according to the following

table.

Example : When the temperature measured value is 7AH and the ambient temperature is 22 ˚C:

7AH (measured value) - 01H (correction value) = 79H (setting value)

* If the temperature measured value deflects between two values, use the smaller value (If 7AH and 79H in the

above example, use 79H.)

(3) Using the jog dial, match the value obtained in Step (2) with the temperature setting value.

Example : When the temperature measured value is 7AH and the ambient temperature is 22 ˚C:

[ TEMP 7A 79 ]

Ambient temperature Correction value

+ 21.0

˚C ~ + 23.2 ˚C

– 1H

+ 23.3

˚C ~ + 26.8 ˚C

± 0H

+ 26.9

˚C ~ + 30.7 ˚C

+ 1H

Check procedure Mode

Check item

Judgement

Possible cause and check content

(Pin 3 of IC1401)

q Playback power output “ppw” DC 0.2V OK (Move on to check w.) –

DC 1.5V NG Perform *1.

w Recording power output “rpw” DC 1.8V OK (End of checking.) –

Less than DC1.5V NG Perform *2.

“rpw” not achieved. – NG Perform *1.

*1: Poor soldering of the line at Pin 100 of IC1401.

Check the line of Pin 93 of IC1401 for short and poor soldering. (Check all the way to the SW P.C.B.)

*2: Check the line of Pin 3 of IC1401 for poor soldering and short with other patterns.

Check the pick-up laser for breakage.

Temperature setting value

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Yamaha MDX-9 Service Manual Page 11

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