Marantz CDR631 Service Manual page 10

5.2 Mechanical service diagnostics
To end test, switch OFF unit
5.2.1 Description
No external tools are required to perform this test. The cover
needs to be removed because the user has to check the
movements of the tray, focus and sledge visually. Pressing
keys [PLAY/PAUSE] and [STOP] simultaneously while
switching on the unit, starts the test. Switching off the unit ends
the test. In case of a CDR500, one can check the CD loader
mechanics in the same way by pressing the above key
combination on the CD player keys.
5.2.2 Requirements to perform the test
• Working keyboard to cycle through the tests and to start up
the test.
• Working local display to check the output messages.
5.2.3 Description of the tests
Focus control test
The focussing lens is continuously moving up and down. The
display reads "BUSY".
Sledge control test
After pressing [F FWD] the sledge continuously moves up and
down. Pressing [REWIND] stops the sledge at the position it is
in and the focus control test resumes. The display reads
"BUSY".
Tray control test
This test starts from within the focus control test routine.
Pressing [OPEN/CLOSE] moves the tray in or out. In the tray
open position one can initiate focus and sledge tests by
MECHANICAL SERVICE DIAGNOSTICS
(test for defective components)
If power ON,
switch power OFF
Press <PLAY/PAUSE> + <STOP>
simultaneously and switch
ON unit
FOCUS TEST
Display shows "BUSY"
Visual inspection
<REWIND>
SLEDGE TEST
Visual inspection
Display shows "BUSY"
< >
OPEN
< >
CLOSE
<FWD>
Figure 5-2
pressing [F FWD]. One has to stop these tests pressing
[REWIND] before it is possible to close the tray again.
Depending on the action the display reads "OPEN",
"OPENED", "CLOSE" or "BUSY".
8
TRAY TEST
Visual inspection
Display shows "OPENED"
even if tray is blocked