Hi All,
The receiver is shutting down on abnormal voltage protection, with the message "PS3 PRT 181" (norm 114-180). I assume the issue points to the POWER (3) so I got into the diagnostic mode and measure some of the voltages at the points to the main transformer and these seems close to there values as found on the schematics
CB15
AC 9.9 (GY): Pin1 10.47V ac
AC 9.9 (GY): Pin2
AC 30 (WH): Pin5 15.76V ac
AC 30 (RE): Pin6
If I measure across Pin4&Pin6 I get the 30V ac. I suspect the schematics is wrong as I get +- 20V across the rectifier, hence the measurement point should've been across those pins not 5&6 but 4&6 to get 30V AC
I also measure the voltages across POWER 1 connector to mains transformer and get
CB11
AC 6.8(YE): 6.53 V ac
AC 15.8(PU): 16.37 V ac
AC 9.1(OR): 9.64 V av
AC 9.2(BL): 9.09 V ac
I performed some other measurements and got close to the values as shown in the schematics however in most cases these voltage values would seems to be within tolerance, but have concerns due to the way this AMP performs its protection checks via a voltage summation circuit to monitored the voltages and triggers it to go into protection shut down
Now I've I got into the diagnostic mode and also replaced the common fault: C405 (it's C4 in this one) just as a precaution.
I've attached a few pages and full schematics found below
RX-V3900
I am hoping people can help me find the cause to fix this AMP
Thanks
PEACE
Kosti
The receiver is shutting down on abnormal voltage protection, with the message "PS3 PRT 181" (norm 114-180). I assume the issue points to the POWER (3) so I got into the diagnostic mode and measure some of the voltages at the points to the main transformer and these seems close to there values as found on the schematics
CB15
AC 9.9 (GY): Pin1 10.47V ac
AC 9.9 (GY): Pin2
AC 30 (WH): Pin5 15.76V ac
AC 30 (RE): Pin6
If I measure across Pin4&Pin6 I get the 30V ac. I suspect the schematics is wrong as I get +- 20V across the rectifier, hence the measurement point should've been across those pins not 5&6 but 4&6 to get 30V AC
I also measure the voltages across POWER 1 connector to mains transformer and get
CB11
AC 6.8(YE): 6.53 V ac
AC 15.8(PU): 16.37 V ac
AC 9.1(OR): 9.64 V av
AC 9.2(BL): 9.09 V ac
I performed some other measurements and got close to the values as shown in the schematics however in most cases these voltage values would seems to be within tolerance, but have concerns due to the way this AMP performs its protection checks via a voltage summation circuit to monitored the voltages and triggers it to go into protection shut down
Now I've I got into the diagnostic mode and also replaced the common fault: C405 (it's C4 in this one) just as a precaution.
I've attached a few pages and full schematics found below
RX-V3900
I am hoping people can help me find the cause to fix this AMP
Thanks
PEACE
Kosti
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