Bang & Olufsen BeoVision 5 - 42 US Manual página 34

The following error types can be displayed:
ML LAST
NO No error registered.
CI Error during address confi guration. No address has been allocated
because an excessive number of units has been connected to the link.
Disconnect all units from the link and reconnect them again, one at the
time.
TD The link is pulled down (Low). This error can occur in the form of a
physical short circuit in the link drivers or in the ML Master/source circuit
in the TV.
Check whether there are pulses at 14IC707, pin 15 (ML M/S).
The frequency should be approx. 1.5ms (the TV is the master).
Disconnect the units from the link, one at a time, and check at the same
time whether communication starts to be transmitted on the link.
TU The link is pulled up (High). This error is caused either by the pull-up
resistance in the system having become too low or an error in the link
drivers.
Disconnect the TV from the external connection.
Switch on the TV, and check that a telegram of approx. 15ms, measured
at 14IC707 pin 13 (ML TRANSMIT), is transmitted within 3-4 seconds. It
should be possible to measure the same signal at 14IC707 pin 11
(ML RECEIVE), only it will be 10-15µs delayed.
- - Other undefi nable error possibilities.
After repair of an error that has trigged the display of an error code, the error code
has to be deleted. This is done by pressing GO in the MONITOR INFORMATION
menu.
IIC bus error
An IIC bus error means that the communication on the bus fails when the
microcomputer tries to communicate with the address in question.
In most cases this means that the addressed IC is defective but the defect could
also be in one of the components surrounding the IC or in other components on
the bus.
Addresses in connection with IIC bus errors:
IC
14IC707 83C528
2IC1 TDA9321H
2IC150 TDA9330H
2IC50 TDA9178
2IC550 PCF8574
2IC800 TDA9141
2IC801 SDA9288
1TU1 UV1536
1IC2 ST2402
1IC3 TDA9850T
3IC501 H8/3664F
14IC680 TDA8444T
Service Mode, English
Function
Data bus converter
Color decoder (HIP)
Video processor (HOP)
CTI
Port expander
Color decoder (PIP)
PIP
TV TUNER
EEPROM
BTSC/SAP stereo decoder
Plasma display FEP
RGB-output
5.11
Adr Bus
62 IIC-1
8A IIC-2B
8C IIC-2B
40 IIC-2B
4A IIC-2B
8E IIC-2B
D6 IIC-2B
C0 IIC-2C
A0 IIC-2C
B4 IIC-2C
80 IIC-2C
4E IIC-2D