Self Diagnostic Software 0 - Sony TRINITRON KV-M1450A Service Manual

KV-M145
4-3. BE-4 SELF DIAGNOSTIC SOFTWARE
The identification of errors within the BE-4 chassis is triggered in 1 of 2 ways :- 1: Bus busy or 2: Device failure to respond to
1°C. In the event of one of these situations arising the software will first try to release the Bus if busy (Failure to do so will
report with a continuous flashing LED) and then communicate with each relevant device in turn to establish if a device is faulty.
If a device is found to be faulty the relevant device number will be displayed through the LED by a Series of flashes which must
be counted (See Table 1)., on fatal errors are reported with this method.
If a fatal error is found, the set will simply stay in whichever state it was when the error occurred, but if a non fatal error occurs
the set will try to continue to operate.
Table 1
No of Flashes
Meaning
Flash Timing Example : e.g. error number 3
2 {C301 not acknowledging |°C transmission, NVM OK. Stby LED
3
C301 FAULT (Not OK) - flags
on
ON
ON
1C301 - No H Flyback
IC301 - Stack Overflow.
Overvoltage / Overcurrent Protection (Pin 52) high.
IC002 not acknowledging ! °C transmission, IC301 OK.
IC002 and 1C301 - No I?C acknowledgment.
General |*°C Error (SDA or SCL being held low)
(1C301, IC001, IC002, CNO01)
Note : Deflection System Adjustments should not be carried
out whilst using an NTSC (60Hz) signal, or if the
signal is unlocked.
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