Previously it had turned off while watching a program, however now it cuts off as soon as I turn it on. This must be over-current protection.How to check: (0)download TX-NR636 service manual which doesn't teach you how to fix over-current protection.See P.11(1)Press display and at the same time Press ON/STANDBY TWICE(2)press home(3) I (over-current)-- 25(temperature in my amp)--42(volume level in my amp)--OA(listening mode in my amp)shown.()shown may be different in your amp. For me: -___25___42___OA. In normal condition, NO WORD in left giving you this "-"__25 instead of alphabet.How to fix over-current protect.Symptoms:time taken to shut down.3 seconds (DC protect) OR immediately shut down (Over Current protect) If over-current protect do thefollowing steps(O)unplug the amp.(1)download NR636service manual.(2)open the amp metal cover.(3)measure 7 large white resistors resistance loacated next to power transistors mounted on a large heat sink with black probe touching the middle pin and red probe to first/left or third/right pin.(4)If this 3 Pins large white colour 0.22ohm x 2 resistor is open with infinity ohms ,(5)replace it and jot down this channel for example left surround faulty. Usually only 1 channel went faulty.(5a)When the white resistor didn't burn, "2 channels" were damaged due to bad soldering joint of the large white resistor, however. (5b)When this happened, time taken of shut-down due to over-current is 3 seconds NOT immediately.(6)the two large power transistors next to this white resistor 0.22 ohms x2 should also be replaced.(7)plug the amp(8)switch it on(9)if ok, troubleshooting get done(10)if not ok(11)replace ALL the components of this power amp channel except these in 11a.(11a)P.30 use left channel as an example. R6140,R6150,C6050,R6160,Q6070,R6430,L6000,R6170,R6180,D6000.(12)pre-amp section no need to check.remember if not OK, the replaced 0.22ohm x 2 resistor and 2 power transistors maybe shorted again. Check them first. If OK, replace ALL Components in this channel except 0.22 ohm x 2 and 2 transistors. 0.22 ohm x 2 means left and middle pin 0.22 ohm as well as right and middle pin also 0.22 ohm that are 2 pieces of resistors with 0.22 ohm in a large white 3 pins resistor.Remember sometimes the0.22 ohm white resistor is normal. If so, use a digital multimeter to measure the be bias transistor voltage via multimeter diode test function. You can compare the normal value,580mV to 650mV with faulty one,3.2mV. And the CE resistance is 1.8ohms only instead of 3 Mega ohms.
SOURCE: Hi, I need help order Onkyo part# BCCLA-1575 for my receiver?
Very poor parts support. They will, flat out, refuse to sell any parts directly to consumers. Stating safety concerns...yeah, right.
Onkyo does not care if their products occupy landfills. They just want the profits.
I have tried just about every Onkyo authorized distributor, and NO ONE will sell me Onkyo parts!
I agree, don't buy Oinkyo
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