Philips CDR600/00/17 Service Manual page 40

GB 36 6.
6.4.1 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 CDR775, one can check the CD loader
mechanics in the same way by pressing the above key
combination on the CD player keys.
6.4.2 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.
6.4.3 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
closed position one can initiate focus and sledge tests by
pressing [F FWD]. One has to stop these tests pressing
[REWIND] before it is possible to open the tray again.
Depending on the action the display reads "OPEN",
"OPENED", "CLOSE" or "BUSY".
CDR600 Diagnostic Software
Figure 6-3
6.5 DC-erase service mode
DC ERASE SERVICE MODE
(erasement of complete CD-RW)
6.5.1 Description
This test is initiated by pressing [ERASE] and [RECORD]
simultaneously while switching on the unit. The player will
erase a complete CD-RW disc (including PMA and ATIP lead
out area) at speed N=2. The display shows the countdown of
the remaining time required for the operation to complete. The
format is "ER mm:ss", where "mm" are the remaining minutes
and "ss" the remaining seconds. After completion the message
"PASSED" is shown, and the player has to be switched off and
on again to start up in normal operating mode. Switching off the
unit before completion of the test, leaves the disc in an
unpredictable state. In such case only a complete DC-erase
procedure can recover the CD-RW disc.
6.5.2 Requirements to perform the test
• Functional CDR player.
• A CD-RW audio disc must be present in the tray.
Load CD-RW disc
Press
<ERASE> + <RECORD>
simultaneously and switch
ON unit
Display shows:
" ER mm:ss "
mm :remaining minutes
ss :remaining seconds
TOTAL and REM are also
illuminated
Display shows:
" PASSED "
when the erase function is
completed
" ERROR "
if DC ERASE fails
To end test, switch OFF unit
CL 96532076_012.eps
290799
Figure 6-4