Question about MA Audio Hard Kore HK-898 Car Audio Amplifier

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Heat at some transistors and resistors in suv800x

Cracking sound both ch. if turn more than half volume is ok.and sound nomal all volume position.i found burning colour at pcb. and heat some transistors power supply circuits 60v. to 17.8 v and 12v.

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Most likely you have played your with either spk bad or bad wiring i have the same exact amp played it hard for more than two year and still have it sitting right now just bench test it last week still drive hard i think you make bad connection some for that to burn like that

Posted on Jun 26, 2009

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Posted on Jan 02, 2017

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I need help with the Onkyo TX-NR636. It cuts off as soon as I turn it on. Previously it had turned off while watching a program, however now it cuts off as soon as I turn it on. Please help!


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.5ec35b57-69c4-4565-931d-6050dd376171.jpgpower amp-fkn3yornxvv0r5asupq1xmgq-3-2_1.jpg

Jan 14, 2018 | Onkyo Audio Players & Recorders

2 Answers

Why does amplifier sound die after a short period of use?


There is a heat sensor on the heatsink (to cooling IC / transistor) which decides current / voltage, in case of overheating. This is indeed to secure IC / transistor power of destruction.
The cause of the excessive heat, the impedance mismatch between the amp to the speakers. It is also possible that parts already exist within the amplifier that is almost / half broken, for example, changing the resistor value, electrolytic capacitors are bulging or dried, isolation transformer windings were charred, solder joint cracking etc. Should be checked, before the fatal damage.

Heatsink on the amplifier (the picture is owned Connelectronic):


25850288-l1qpqmriditabltrjczr2eku-4-0.jpg

Sep 05, 2015 | Laney Music

1 Answer

No pic no sound no a/v only vol. & ch. display


pls. check the resistor in series with the crt heater.

Jul 04, 2013 | Sharp 25R-S100 25" TV

1 Answer

Denon AVR2106 One output channel shorted and blown. 2 power transistors shorted, emitter resistors and base resistors blown Have replaced all, including bias transistor I think bias is still wrong (no...


I would also replace 2sa992 (2pcs) and 2sc1845 on preamp board- sometimes they look ok when you test them by regular meter. Check 1.2 kOm and 4.7ohm resistors at preamp pcb. Check diodes on output pcb (could be smd type, connected from base of output transistors to emitter i think)

Sep 07, 2011 | Denon Audio Players & Recorders

1 Answer

My sr 870 (marantz is probably about 7 - 8 years old, and have noticed that this issue with loud sounds is getting worse over the years, I have upgradedmy cabling , to the speakers, have upgradedall the...


Something is tripping the safety in the unit.
I'd be checking the output transistors or hybrid chip, and take a good look at the electrolytic capacitors and make sure none of them are leaking or bulging at the top.
Look for signs of heat wear on resistors especially near the output stages.
You may simply have to take it in for service if you aren't electronics savvy.

Mar 01, 2011 | Audio Players & Recorders

2 Answers

A sudden burst of high volume from a CD player rendered this Onkyo TX 85-11 dead. The volume was at the highest level ... necessary to run an Ipod through the receiver. When we switched to the CD player,...


This is a 2 channel stereo unit. Ebay shows @ a dozen of them for sale between $46- $90. In davenport Iowa, which isn't an expensive area, you can't touch a repair for that. Check your area Our estimate fee alone is $43

Oct 23, 2017 | Onkyo TX-8511 Receiver

2 Answers

Technics amp su-vx800 goes in to protection mode after approx. 10 to 15 mins of play depending on the volume level.switch it off for 2 mins and it operates again.Could this be a faulty muting ic AN7073, a...


yes it can, it sounds like its over heating, make sure that your product is able to get fresh circulated / cooler air
if it already is, then it probably is a faulty product.

Nov 22, 2008 | MA Audio Hard Kore HK-898 Car Audio...

1 Answer

Onkyo TX-DS494 stereo receiver won't turn on.


First, check which type of protect first.

Symptoms:
3 seconds (DC protect) OR immediately shut down (Over Current protect)

How to confirm?
1.Unplug the amp.
2.Remove the metal cover.
3.You will see a long vertically installed pre-amp board mounted next to those large power transistors fixed by 12 screws on a large aluminium heat sink.
4.Remove this long vertically installed board mounted by 2 screws.
5.With 2 screws removed, just pulling this board out and hold it with one hand.
6.Plug the amp and switch it on.
7.If your amp stays ON forever, the problem is from this long board.
8.If switch off at once, the problem is from power amp board.
Try the above- mentioned steps. If DC protect, write an email to me via searching you tube SR600 capacitor replacement. Don't be afraid.
So many people wrote to me.

If over-current protect do the
following steps
(O)unplug the amp.
(1)download DS-TX494 service 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.
(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 the
0.22 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.

635a346f-06d4-484f-8cf9-097f9cad08bb.jpg


power amp-fkn3yornxvv0r5asupq1xmgq-3-2.jpg

Jan 09, 2018 | Onkyo TX-DS494 Receiver

1 Answer

MISTUBISHI VS-50501A - top 3/4 of screen displays ok, rest does not


Check the vertcle yoke pins for solder cracks. Check verticle output circuitry resistors and transistors. And also check for Coolant leaks from the CRTs this happens alot. Check capacitors for any signs of sweeling or heat as well.

Sep 15, 2007 | Mitsubishi VS-50501 50" Rear Projection...

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