Yamaha MDX-596 Service Manual page 22

MDX-596
Disc cannot be loaded properly.
Does the loading function work properly when a disc is inserted?
NO
Does No.5 pin of CN1401 become "H"?
YES
Does a change occur at either No.19 or 20 pin of IC1601?
YES
Does a change occur at either No.12 or 13 pin of IC1601?
YES
Check M903.
YES
Does eject function work when the MD eject button is pressed?
YES
Is the disc drawn in again immediately after it is ejected?
YES
Check CN1901 and SW1932.
Play mode is not available.
Is the play mode unavailable with either high reflecting disc
or low reflecting disc?
NO
Is the play mode unavailable only with the high reflecting disc?
YES
Is the voltage at No.93 pin of IC1401 1.45 ± 0.15V in the test
mode state with a high reflecting disc loaded?
NO
After readjustment, proceed to the check item "Normal reproduction".
21
YES
NO
NO
NO
NO
YES
YES
Check CN1401, CN1931 and SW1932.
Check IC1401.
Check CN1401, CN1931 and IC1601.
Proceed to the check item "Checking by using the test mode".
NO
The play mode unavailable only with the low reflecting disc.
YES
Is the voltage at No.93 pin of IC1401 with a low reflecting disc loaded
1.75V ± 0.15V (recordable) or 2.15V ± 0.15V (recording inhibited)?
NO
YES
Check SW1931, loading circuit board and CN1931.