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Troubleshooting - Yamaha MDX-E300 Service Manual

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MDX-E300
I TROUBLESHOOTING
When MD fails to operate
When the objective lens of the optical pickup becomes dirty, MD may fail to operate. Clean the objective lens first and
check MD for reproduction function. If it still fails to operate, check according to the following flow charts.
Contaminant on the pickup lens such as dust or other foreign matter may cause the pickup to skip or the TOC (content of
the selection) not to be displayed. Check if the lens is clean before making adjustments. If the lens is dirty, clean it as
follows.
G Turn off the power. Dampen the lens cleaning paper with a small amount of isopropyl alcohol and wipe the lens with it,
using care not to cause any damage to the lens. Be sure not to touch the lens with your hand directly.
Does the power turn on when the POWER button of the main unit is pressed?
YES
M
Does the disc loading function work properly?
YES
M
Is the play mode available when the PLAY/PAUSE button is pressed?
YES
M
Is appropriate audio output provided?
YES
M
Does recording/reproduction function work properly?
Power fails to turn on.
Does the unit operate properly when the STOP button is pressed?
NO
M
Is +5V ~ +6V voltage applied to No.17 and 18 pins of CN1501?
YES
M
Is a pulse applied to No.6 pin of CN1501 when the reset power is turned on?
YES
M
Is the voltage at No.62 pin of IC1401 +3.2V?
NO
M
Is a 8.4672MHz pulse applied to No.15 pin of IC1401?
YES
M
Is a pulse output from No.34 pin of IC1401?
YES
M
Check CN1501 and IC6.
36
NO
Check the trouble item "Power fails to turn on".
NO
Check the trouble item "Disc cannot be loaded properly.".
NO
Check the trouble item "Play mode is not available.".
NO
Check the trouble item "Audio reproduction circuit".
NO
Check the trouble item "Recording/reproduction function".
YES
Check the display section.
NO
Check the power supply section and CN1501.
NO
Check IC6 and CN1501.
YES
Check around Q1804 and IC1401.
NO
Check IC1201.
NO
Check IC1401.

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