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SE RVICING HINTS
SERVICE TEST PROGRAMME
The 1-1C test programme can be called without first
entering the security code.
1-1C
test
This test is called by turning the set
on
while keeping the
~
P
1
.
and
P2 keys depressed.
Besides the RAM, a great number of 1-1C instructions are
tested
.
If no faults occur, a special pattern will be
displayed. (See fig
.
1 f)
The test can be stopped by turning the set off.
Display test
The display test is called by turning the set on while
keeping the P1 and
P3
keys depressed.
A number of easily recognizable patterns are then
displayed in succession. (See figs
.
1 a to 1 h)
If you want to make one of the patterns visible for a
longer
time
,
you only have to keep the P1 key pressed
for the required time
.
SECURITY
CODE
General
To reduce the risk of
theft,
this car radio has a built-in
electronic lock. The security code has been entered in
the factory and cannot be changed by the
customer.
The security code consists of four figures varying
between
"0000"
and
"9999".
The figures are selected by
pressing the UP and DOWN keys and are entered by
pressing the P1 key. If you enter a wrong code
,
you will
hear an error bleep and after 1 minute you will be given
a new opportunity to enter the right code. Each time a
wrong code is
entered,
the waiting time is doubled, so 1,
2,
4, 8 etc. with a maximum of 32
minutes.
Note: If the set is presented for repair with the security
code switched on, and the customer has not stated the
right code
,
the set will not be able to function.
Replacing the eeprom by a "non-coded" eeprom and/or
replacing the
microprocessor will not help in that case.
Working
ACTIVATING THE SECUR ITY CODE
Proceed as follows:
Switch the set on
while
pressing the
UP key.
Now you hear a two-tone beep and the protection is
activated.
The car radio will signal that the code has been activated
by briefly showing in the display the character
'-C-'
at the
moment of switching on the radio.
ENTRY OF
THE CODE
Example:
Suppose the code is 4567.
Action
Display
Note
shows
-Switch on
-C-
-Press P1
-Select UP/DOWN
"4"
4
first figure
-Press P1
4-
-Select UP/DOWN
"5"
45
second figure
-Press P1
45-
- Select UP /DOWN
"6"
456
third figure
-Press P1
456-
-
Select UP/DOWN "7"
4567
fourth figure
-Press P1
confirmation tone
The radio is now on and you can operate the cassette
player.
Now that the security code is
active,
the code should be
entered again each time the supply voltage has been
interrupted.
To indicate that the security code is activated, the display
briefly shows the character
"C"
each time the set is
turned on.
SWITCHING THE CODE OFF
Switch the set on whil
e
pressing the
UP
key
.
The display
shows the indication "-C-". Enter the right code in the
way described above. Two two-tone squeaks confirm
that the security code is switched off.
/A
ESD~
All ICs and many other semi-conductors are susceptible
to electrostatic discharges
(ESD).
Careless handling during repair can reduce service life
drastically. When repairing
,
make sure that you are
connected to the same potential as the mass of the set
via a wrist wrap with resistance
.
Keep components and tools also at this potential.
CS 12 222GB
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