Focus Control Test; Sledge Control Test; Tray Control Test; Dc-Erase Service Mode - Philips CDR775 Service Manual

GB 42 6.
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
open 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 close the tray again.
Depending on the action the display reads "OPEN",
"OPENED", "CLOSE" or "BUSY".
6.5

DC-erase service mode

DC ERASE SERVICE MODE
(erasement of complete CD-RW)
Load CD-RW disc
<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
Figure 6-4
CDR775 Diagnostic Software
Press
CL96532086_027.eps
080999
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.