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Bang &Olufsen
REPAIR TIPS
Error messages displayed on
screen
Tuning
Transistor 7625
BUT 12
Start-up
REPAIR TIPS ENGLISH
Certain types of errors which may affect the communication on the ?C
bus can cause an error message in the lower left-hand corner of the
TV screen. The error message is shown simultanously with the TV
program number.
Some errors will also make the st by LED flashing.
St by LED
Possible fault
"err chroma"
Flashing
1C7309 and surrounding
components
Tuner and surrounding
components
"err tuner"
None
None
1C7710 and surrounding
components
"err eeprom"
"err 8425"
None
Sound processor IC7213 and
surrounding components on
module 7, or sound processor
IC7220 and surrounding-
components on module il
"err 8415"
None
surrounding components
"err NICAM"
None
NICAM decoder IC7150 and
surrounding components
'cm
1C7820 and surrounding
err bus"
Flashing
'
Stereo decoder IC7200 and
components
I?C bus blocked
Flashing
uC C7708 and surrounding
components
If more than one error occur at the same time, only the most impor-
'tant error is displayed. The table is organized with less important
errors at top, and major errors at the bottom.
The tuning voltage can be measured on pin 11 of the tuner.
If an error occurs such that the tuning voltage is either maximum
(32.5V) or minimum (1.1V) when trying to tune to a frequency, the
error will probably be in the tuners PLL-circuit, and the tuner should
be replaced.
AGC is supplied to the tuners pin 5 (5.8V with signal and 9.3V without
signal).
If transistor 7625, BUT 12, in the power supply (SOPS) become defec-
tive all the time, it can be caused by a defective zener diode 6617.
If the Standby LED do not turn green during start-up, there will be a
fault in the line output circuits.
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