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Search: Posts Made By: petehall347
Forum: General Electronics Technical Discussion 01-14-2021, 03:26 PM
Replies: 7
Views: 147
Posted By petehall347
Forum: Troubleshooting Audio Equipment 01-14-2021, 01:46 PM
Replies: 17
Views: 404
Posted By petehall347
Re: A 9010 o n k y o amp , schematics & help please

strange as it seems maybe input selector ic fault .
i say this as had same thing a few years back with a similar amp .
hot swapping inputs can blow up the ic . well not visibly blown .
Forum: Troubleshooting TVs and Video Sources 01-13-2021, 07:59 PM
Replies: 22
Views: 296
Posted By petehall347
Forum: Troubleshooting Audio Equipment 01-12-2021, 05:40 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

make up the dual packages with 2x KSC1845FTA each package .
Forum: Troubleshooting Audio Equipment 01-12-2021, 12:16 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

no the differential pairs .. i think these are 5 legged ones .
you can use closely matched pairs that are correct spec to do the job .
Forum: Troubleshooting Audio Equipment 01-12-2021, 09:31 AM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

offsets are a bit high . you could sub in a pair of transistors for each diff pair .
Forum: Troubleshooting Audio Equipment 01-11-2021, 06:13 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

you wont see any offsets with the relay being off ..you need to measure before the relay .i mostly look for the coils near the output transistors .
Forum: General Electronics Technical Discussion 01-11-2021, 06:09 PM
Replies: 11
Views: 431
Posted By petehall347
Re: 4017 counter reset problem

is this a can bus system ?
Forum: Troubleshooting Audio Equipment 01-11-2021, 01:21 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

where are you measuring dc offsets ?
set bias after warm up .
Forum: Troubleshooting Audio Equipment 01-11-2021, 11:24 AM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

check the bias and dc offsets
Forum: Troubleshooting Audio Equipment 01-09-2021, 07:07 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

check if any outputs shorted . if so its maybe the bias trimmer went open circuit after moving it .
Forum: Troubleshooting Audio Equipment 01-08-2021, 02:33 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

looking like its he hb amp . its NSA . i know this design is very picky about components being changed .

i would try and rule out the pre amp by checking wave-forms at the vol pot .
Forum: Troubleshooting Audio Equipment 01-07-2021, 05:04 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

check further back in the circuit to see where its coming from .
also try without a speaker load .
and try without an input
Forum: Troubleshooting Audio Equipment 01-07-2021, 05:03 PM
Replies: 24
Views: 441
Posted By petehall347
Re: Old Pioneer Amp - Waveform explanation

hope you didnt really mean 310mv ?
Forum: Troubleshooting Power Supplies and Power Supply Design 01-03-2021, 07:48 PM
Replies: 18
Views: 1,413
Posted By petehall347
Re: Toshiba laptop charger power supply problems

what multi-meter do you have ? i want one that does that
Forum: Troubleshooting Power Supplies and Power Supply Design 01-02-2021, 07:09 PM
Replies: 18
Views: 1,413
Posted By petehall347
Forum: Troubleshooting Power Supplies and Power Supply Design 01-02-2021, 06:56 PM
Replies: 1
Views: 77
Posted By petehall347
Re: Mains inverter build quality pictorial

can you do a scope trace video of the sine wave unloaded and loaded to max ?
Forum: Troubleshooting Audio Equipment 01-02-2021, 08:11 AM
Replies: 2
Views: 89
Posted By petehall347
Re: Akai am-u03 integrated amplifier

shouldn't be any problem so long as there are no other problems
Forum: Troubleshooting Audio Equipment 12-31-2020, 07:27 PM
Replies: 15
Views: 277
Posted By petehall347
Forum: Troubleshooting Power Supplies and Power Supply Design 12-30-2020, 06:58 PM
Replies: 6
Views: 164
Posted By petehall347
Re: AimLite EBST-2L Emergency Light Transformer

do you want just the transformer or the whole circuit board ?
what diagnosis has been done ?
Forum: Troubleshooting Power Supplies and Power Supply Design 12-27-2020, 06:39 PM
Replies: 18
Views: 526
Posted By petehall347
Re: Samsung Washing machine won't power on dc41-00189a

first check fuses and report any blown ones before proceeding further
Forum: Troubleshooting TVs and Video Sources 12-19-2020, 04:48 PM
Replies: 10
Views: 285
Posted By petehall347
Re: Samsung UN55HU6840 Solid red light, won't turn on

is the BD228 a regulator transistor .. if so check its collector emitter and base voltages
Forum: General Electronics Technical Discussion 12-19-2020, 12:14 PM
Replies: 25
Views: 867
Posted By petehall347
Re: Magnetic Stirrer Project Reset

i thought it might make changing patterns .
Forum: Troubleshooting TVs and Video Sources 12-18-2020, 08:00 PM
Replies: 110
Views: 1,811
Posted By petehall347
Re: Sound and picture but no backlight

are all led circuits same voltage on your tester ? must have connector unplugged from power board .
if they are plug it back in and see if magic happened . dont know what it is with my tester but 2...
Forum: General Electronics Technical Discussion 12-18-2020, 07:56 PM
Replies: 17
Views: 369
Posted By petehall347
Re: SR-602 PIR sensor not working. Ideas ?

not that i think it will work but you could try a voltage divider on the relay driver transistor base .
another thing to try is the light bulb circuit in the instructions .that at least rules out...
Showing results 1 to 25 of 500

 
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