Be-4A Self Diagnostic Software - Sony TRINITRON KV-M2170A Service Manual

4-3. BE-4A SELF DIAGNOSTIC SOFTWARE
The identification of errors within the BE-4A chassis is triggered in 1 of 2 ways :- 1: Bus busy or 2: Device failure to respond to
I'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), Non 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 |
2 IC301 not acknowledging |'C transmission, NVM OK.
3 IC301 FAULT (Not OK) - flags
4 1C301 - No H Flyback
5 1C301 - Stack Overflow.
6 Overvoltage / Overcurrent Protection (Pin 52) high.
IC002 not acknowledging !°C transmission, IC301 OK.
IC002 and IC301 - No |°C acknowledgment.
General I°C Error (SDA or SCL being held low)
(IC301, IC001, ICO02, CNO01)
Note : Deflection System Adjustments should not be carried
out whilst using an NTSC (60Hz) signal, or if the signal
is unlocked.
KV-M217
Flash Timing Example : e.g. error number 3
Stby LED
ON ON ON
OFF OFF