Service Test Program - Philips MC-120 Service Manual

CD SERVICE TEST PROGRAM
DISPLAY TEST
N DBB button
pressed?
Y
Display shows all
segments and flags
for checking open circuits.
see figure 1
IS - LED is switched on.
N
DBB button
pressed?
Y
Display shows figure 2.
All alternate pins (2, 4, ..)
of the display are activated
for checking shortcircuits.
IS - LED is switched off.
N STOP button
pressed?
Y
DBB CD TUNER
TIMER
E O N SIDE A PROGRAM SHUFFLE FM STEREO
RECORD REPEAT ALL MWLWAM
NEWS SIDE B
fig. 1
STEREO
AM
fig. 2
4 - 2
Program & Shuffle buttons
plugging mainscord in.
CD SERVO TEST
STOP button pressed in any step returns
N PLAY button
pressed? to begin of Service Testprogram.
Y
Display shows
CD99
SLIDE MOTOR test
N N
PLAY button NEXT button PREV. button
pressed? pressed? pressed?
Y
Y Y
FOCUS search
Display shows
FOC ERR
Slide moves Slide moves
outside as inside as
objective moves up&down
long as button long as button
disc motor for 300ms "on"
is held is held
depressed. depressed.
N
FOCUS found?
Y
Display shows
FOC OK
disc motor turns.
N PLAY button
pressed?
Y
Display shows
DISK OK
N
PLAY button
pressed?
Y
Display shows
RDL
release mute
N NEXT button PREV button N
pressed? pressed?
Y Y
jumps in steps of jumps in steps of
16 tracks forward 16 tracks backwards
EUR
EUROPE
REGION
FM/MW
&
SET VERSIONS
/22/25
1)
To toggle frequency grid press SHUFFLE button for more than 5s in normal tuner mode (not in service testmode).
GRID 9
Display will show either
To enter Service * Door switch is ignored → CD door can be opened.
Testprogram hold
* In CD- and Tuner tests the sound settings Volume up/down,
DSC, IS and DBB function as in normal mode,
depressed while
but flags will not be indicated on the display in all steps.
Display shows
S
stands for Service mode
version number
of the µP - software.
Slide servo, Radial servo, Focus servo, Disc motor
S 84
and Laser are switched off.
Mute is switched on via decoder IC.
FORMAT EEPROM
DISC MOTOR test
N N N
SHUFFLE button PROG button
pressed? pressed?
Y Y
Display shows: Display shows:
CW CCW
Disc motor turns Disc motor turns
clockwise counter clockwise
as long as button as long as button
is held depressed. is held depressed.
TUNER VERSIONS
USA OSE
USA OVERSEAS
FM/MW FM/MW
1) Grid switchable
100/10kHz - 50/9kHz
/37 /21/21M/30
table 2
GRID 10
or for 2 s.
4 - 2
TUNER TEST
PROG button
N
RDS button
pressed?
pressed?
Y
Y
Display shows Display shows version
EPF of tuner board as long as
any key will be pressed.
for 2s.
EUR
e.g.
EEPROM is cleared and
default values are stored.
Tuner is normal working
except for the PROGRAM
button.
This test should be done at the
end of the production process
so that every set is customised
before leaving factory.
POWER
switched off?
Y
Exit Service Testprogram
CD ERROR CODES
Error number Error description
E1000 Focus error
Triggered when the focus is lost during playing the CD.
E1001 Radial error
Triggered when the radial servo is not on track for a certain time during playing the CD.
E1002 Slide-in error
The sledge did not reach its inner position (innerswitch is closed) before approximately 6
seconds have pressed by - innerswitch or sledgemotor problem.
E1003 Slide-out error
The sledge did not come out of its inner position (innerswitch is open) before
approximately 300ms have passed by - innerswitch or sledgemotor problem.
E1005 Jump error
Triggered when the jump destination could not be found within a certain time.
E1006 Subcode error
No valid subcode for a certain time during play.
E1007 PLL error
The Phase-Lock-Loop could not lock within a certain time.
E1008 Turntable motor error
Generated when the CD could not reach 75% of speed during start-up within a certain
time. Discmotor problem.
E1020 Focus search error
The focus point has not been found within a certain time.
table 1
Error type: W = Warning set continues operation, message remains on the display until next error occurs
→
or any key is pressed.
F = Fatal Error → set stops operation, message remains on the display.
N
N
Error type
W
W
W
W
W
W
W
W
F