Philips 7592, Руководство по обслуживанию

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Error 4 = +5V protection
5V protection active; set is switched to protection; error code 4 is placed in the error buffer; the LED will blink 4 times
(repeatedly). A 5V failure can cause a drop in the 5V-supply output, resulting in an undefined behavior of the set. Therefore, all
I2C devices connected to the 5V supply are constantly monitored. When none of these devices responds to the micro controller
for a prolonged time, the micro controller assumes that there is a failure in the 5V supply.
By starting up the set with the service jumpers shorted, the 5V protection is disabled and it is easier to determine the cause.
+5V protection will be activated when these I2C devices fail (no I2C communication):
•
Main Tuner – 1125 on main panel
•
ITT sound processor – MSP34xx (7064) on the SSB
The following tips are useful to isolate the problem area after overriding the +5V protection. Determine whether:
•
The +5V source is working properly; isolate coil 5430 and jumper 9044 and measure the +5V
•
ITT sound processor circuit is loading the +5V; isolate coil 5430
•
The tuner is loading the +5V source; isolate jumper 9044
•
Main tuner circuit is loading the +5V source; isolate coil 5261
Caution! Overriding the 5V protection when there is a 5V failure can increase the temperature in the set and may cause
permanent damage to components. Do not override the 5V protection for a prolonged period of time.
Error 5 = Reserved
Error 6 = General I2C error. This error code will be displayed in the following cases:
•
SCL or SDA is shorted to ground
•
SCL is shorted to SDA
•
SDA or SCL connection at the micro controller is open circuit.
Error 7 = BC-loop not stabilized (BCF = 1) Black current loop instability protection. The possible cause could be a defect in
one or more of the RGB amplifiers, RGB guns or RGB driving signals.
Error 8 = BOCMA (signal processor) IC – TDA888xx I2C communication failure. BOCMA (item 7301 on SSB) is corrupted or
the I2C line to the BOCMA is low or no supply voltage present at pin 14 and/or pin 60 (3V3)
Error 9 = BOCMA (signal processor) IC – TDA888xx 8V failure (SUP bit). No supply voltage at pin 53. Check NFR 3331 and
coil 5333.
Error 10 = Non Volatile Memory I2C error. NV memory (EEPROM – item 7066) does not respond to the micro controller.
Error 11 = Micro controller / NV Memory identification error. During the last start-up the NVM and the micro controller did not
recognize each other (e.g. one of them was replaced or the NVM memory has been changed/adapted or lost),
therefore the NVM was loaded with default values.
Error 12 = Microprocessor (Painter – item 7064) internal RAM test failure.
Error 13 = Main Tuner I2C failure UV13xx. Tuner (item 1225) is corrupted or the I2C line to the Tuner is low or not supplying
voltage at pin 9, pin 6 or pin 7 of the tuner.
Error 14 = Sound processor I2C error (MSP34xx -). Sound controller MSP3400 or MSP3410 does not respond to the micro
controller.
Error 15 = SRAM (Static Random Access Memory) IC uPD431000A-B test failure (item – 7070).