2-3
6. SERVO TEST
SER VICE TEST PROGRAM
Purpose:Check door- and inner-switch, movement of slide and
acceleration of discmotor.
1. PRELIMINARY SETUPYTo enter the servo test start service test program and press the
YTo enter the service test program hold the keys OPROGRAM�OPLAY� button.
and OSTOP� depressed while turning POWERON.YThe display shows OSxy�. Ox� indicates state of door-switch; Oy�
indicates state of inner-switch. x,y= O1� means switch is open.
YThe display shows the software-version of the built-inYTo move slide outside hold the ONEXT� button depressed.
microprocessor (e.g. O90S�).
YThe program is now in the main menu � various tests can beYTo move slide inside hold the OPREV� button depressed.
entered by pressing the corresponding buttons (see flow chartYTo accelerate the discmotor clockwise hold the OMODE� button
depressed.
or detailed description of test programs below).
YTo accelerate the discmotor counter-clockwise hold the ODSP�
button depressed.
2. DISPLAY TESTYTo enter the focus test press the OPLAY� button, to exit the
Purpose:Check the internal display driver of the ?P and theservo test and return to the main menu press the OSTOP�
display segments.button.
YTo enter the display test start service test program and press
the ONEXT� button.
YThe display shows test pattern 1. Three more test patterns are7. FOCUS TEST
available.Purpose:Check movement of lens and operation of focus servo.
YTo jump to the next pattern press the OPLAY� button.YThe focus servo loop is switched on and the set starts
YTo exit the display test and return to the main menu press thesearching the focus. If the focus is OK the display shows OF�,
else O-F�.
OSTOP� button.
YWhen the disc is turned manually Ofocus noise� is audible.
YTo move slide outside hold the ONEXT� button depressed.
YTo move slide inside hold the OPREV� button depressed.
3. KEY & REMOTE CONTROL TEST
Purpose:Check operation of keys and remote control.YTo accelerate the discmotor clockwise hold the OMODE� button
YTo enter the key & remote control test start service testdepressed.
program and press the OMODE� button.YTo accelerate the discmotor counter-clockwise hold the ODSP�
YThe display shows O--�.button depressed.
YPress keys on the set resp. the remote control and check theYIn case the focus is OK the discmotor test can be entered by
pressing the OPLAY� button, to exit the focus test and return to
corresponding key codes on the display of the CD-player resp.the main menu press the OSTOP� button.
the test patterns on the display of the remote control. Codes
and patterns can be found in table 1 (see flow chart).
YTo exit the key & remote control test and return to the main
8. DISCMOTOR TEST
menu press the OSTOP� button.
Purpose:Check speed regulation of discmotor.
YThe speed regulation is switched on and the discmotor starts
4. PLAYBACK TEST WITH ERROR ANALYSISrotating. If the speed reaches 75% of the nom. speed the
Purpose:Analyse errors that occur during playback.display shows Od�, else O-d�.
YTo enter the playback test start service test program and press
Note:During this test the ?P displays the speed-flag of the CD7.
the ODSP� button. Note that the playback test can only be
entered if the CD-door is closed.As this IC can only monitor a small range of speed
YThe set now reads the TOC and switches to stand-by.deviation the displayed information is not very reliable. In
YPress the OPLAY� button to start the error analysis.case of doubt check disc motor control circuit.
As long as the playback is free of errors the display shows trackYIn case the disc speed is OK the radial test can be entered by
pressing the OPLAY� button, to exit the discmotor test and
and time information as in normal play-mode. In case of an error
a corresponding error code will be displayed. The meaning ofreturn to the main menu press the OSTOP� button.
this error code can be found in table 2 (see flow chart).
Note:Errors can either be Ofatal�or Onon fatal�. Fatal errors9. RADIAL TEST
always stop the playback, non fatal errors only cause aPurpose:Check if radial loop locks and an audio signal is
output.
short interruption of the music. Fatal errors are displayed
as long as the set is connected to the power source, nonYThe display shows Ord�.
fatal errors are displayed till a new error occurs or aYThe radial servo loop is switched on, mute is released and an
audio signal is audible.
button is pressed.YTo jump 10 tracks outside press the ONEXT� button.
YTo stop the playback test disconnect the set from the powerYTo jump 10 tracks inside press the OPREV� button.
source.YTo enter the error correction analysis press the OPLAY� button,
to exit the radial test and return to the main menu press the
OSTOP� button.
5. IC-CHECK
Purpose:Check communication between ?P ? CD7 and
?P ? NPC (DRAM controller).10. ERROR CORRECTION ANALYSIS
YTo enter the IC-check start service test program and press thePurpose:Check the error status of the CD7 in double speed
mode (measurement of block error rate, number of
OPLAY� button.
YThe display shows OCx ny�. OCx� indicates result of CD7-check;interpolations, a.s.o).
Ony� indicates result of NPC-check. x,y = �1� means that theYThe display shows OH�.
test has been passed successfully; x,y = �0� specifies an errorYThe disc turns at double speed, mute is released and music is
during communication.audible with twice the normal speed.
YTo enter the servo test press the OPLAY� button, to exit the IC-
Note:This test program is used for statistical analysis of the
check and return to the main menu press the OSTOP� button.
error correction of the CD7. As the test requires additional
hard- and software it can?t be carried out at Onormal�
repair shops.
YTo exit the error correction analysis and return to the main
menu press the OSTOP� button.
CS 46 434 |
ACEC
