Philips AZ1050, Service Manual

Page: 11 / 28

SERVICE TESTPROGRAM
4-2 4-2
PCS 99 154
STOP button pressed in any step returns
to begin of Service Testprogram. NEXT button
pressed?
STOP button
pressed?
N
N
Y
Y
Y
Y
N
Display shows all
segments and flags
for checking open circuits.
see figure 1
Display shows figure 2.
All alternate pins (2, 4, ..)
of the display are activated
for checking shortcircuits.
DISPLAY TEST CD SERVO TEST
Display shows
version number
of the µP - software.
PLAY button
pressed?
Display shows
PLAY button
pressed?
NEXT button
pressed?
PREV. button
pressed?
MODE button
pressed?
Slide moves
outside as long as
button is hold
depressed.
To check Focus over the whole disc area
Slide - and Discmotor can also be activated
in FOCUS - test.
Slide moves inside
as long as button
is hold depressed
or until inner-switch
is activated.
Disc motor turns
clockwise
as long as button
is hold depressed.
(accelerate )
NEXT button
pressed?
Y Y Y Y
N N N N
FOCUS found?
Y
N
Display shows
objective moves up&down
disc motor for 160ms "on"
PLAY button
pressed?
Y
N
Display shows
disc motor turns.
NEXT button
pressed?
Y
Display shows
PREV button
pressed?
Y
CUE - mode
jumps in steps of
16 tracks forward
FOCUS search
automatic
adjustment of
TRACK BALANCE
REVIEW - mode
jumps in steps of
16 tracks backwards
SLIDE test DISC MOTOR test
To enter Service
Testprogram hold
PLAY & STOP buttons
depressed while switching
CD mode on.
fig. 1
servtest EVA, 030398
*
*
To leave Service Testprogram switch
CD mode off.
Door switch is ignored
Æ
CD door can be opened.
Slide servo, Radial servo, Focus servo, Disc motor
and Laser are switched off.
Mute is switched on via decoder IC.
Purpose of RADIAL test:
To check if the Audio signal is reproduced.
Subcode info is ignored during this test
Æ
If the CD player functions well in this testmode,
but not in the normal Play mode check quality
of the eye-pattern signal.
RADIAL test
Display shows
Æ
Play mode
MUTE is switched off
while autom. track balance adjustment is active
as soon as track balance adjustment finished.
(1 - 6) indicates the actual setting.
PLAY button
pressed?
Y
N
MODE button
pressed?
Y N
Display shows
automatic
adjustment of
FOCUS GAIN
while autom. focus gain adjustment is active
as soon as focus gain adjustment finished.
(1 - 6) indicates the actual setting.
PLAY button
pressed?
Y
N
MODE button
pressed?
Y N
Display shows
track servo switched on
automatic
adjustment of
TRACK GAIN
while autom. track gain adjustment is active
as soon as track gain adjustment finished.
(1 - 6) indicates the actual setting.
PLAY button
pressed?
Y
N
N N
MODE button
pressed?
Y N
N
SHUFFLE
PROGRAM
REPEAT
ALL
fig. 2
SHUFFLE REPEAT
If the margin settings 0 or 7 are displayed the required
setting is possibly out of the adjustment range.
Æ
check disc drive and/or electronic circuitry
The CD PLAY TEST is intended to be used
for continuously playing a disc in order to
detect intermittend or not reproducible
failures. The error code indicates where
the failure can be found.
1)
Y
CD PLAY TEST
1)
N
CD is in normal
PLAY mode.
In case of failures
error codes acc. table 1
will be indicated
on the display.
POWER
switched off?
N
Y
Exit Service Testprogram
MODE button
pressed?
set continues operation, message remains on the display until next error occurs
or any key is pressed.
Error number Error type
Error type:
Error description
E0 Focus Error
Triggered when the focus is lost for more than 250ms during playing the CD.
E6 Subcode Error
No valid subcode for 300ms during PLAY.
E3 Slide-out error
Generated when the inner-switch did not open within approx. 250ms when the pick up is
moved from the inner position outside. Inner-switch or slide motor problems.
E2 Slide-in error
Generated when the inner-switch did not close within approx. 4s when the pick up is
moved inside. Inner-switch or slide motor problems.
W
F0 Focus Search Error
Triggered when the focus could not be found within 3s when starting up the CD.
F
W
W
F2 Fatal Subcode Error
No valid subcode for more than 4s during PLAY.
F
W
W
W
W = Warning
Æ
F = Fatal Error
Æ
set stops operation, message remains on the display.
CD ERROR codes
table 1
(The set can only be operated again via a reset)
E5 Jump error.
Triggered when the servo processor counts too less tracks in a defined time during JUMPS.
This can be caused by a disturbed HF-signal (the tracks cannot be recognized exactly),
slide motor problems, track servo problems or scratched discs.
E7 PLL lock error
When the PLL did not lock after 10 retries then this warning message is generated and
the servo is stopped and restarted (as if the user would have pressed STOP and then
PLAY immediately) to recover.