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Posts Made By:
petehall347
Forum:
General Electronics Technical Discussion
01-14-2021, 03:26 PM
Replies:
7
How is called that compound that glues components on the PCB?
Views:
147
Posted By
petehall347
Re: How is called that compound that glues components on the PCB?
thermal adhesive
Forum:
Troubleshooting Audio Equipment
01-14-2021, 01:46 PM
Replies:
17
A 9010 o n k y o amp , schematics & help please
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
Toshiba FireTV image jumps every two seconds. Can it be fixed?
Views:
296
Posted By
petehall347
Re: Toshiba FireTV image jumps every two seconds. Can it be fixed?
am thinking poor solder joint .
Forum:
Troubleshooting Audio Equipment
01-12-2021, 05:40 PM
Replies:
24
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
4017 counter reset problem
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Old Pioneer Amp - Waveform explanation
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
Toshiba laptop charger power supply problems
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
Toshiba laptop charger power supply problems
Views:
1,413
Posted By
petehall347
Re: Toshiba laptop charger power supply problems
are you for real ?
Forum:
Troubleshooting Power Supplies and Power Supply Design
01-02-2021, 06:56 PM
Replies:
1
Mains inverter build quality pictorial
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
Akai am-u03 integrated amplifier
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
Harman Kardon HD200 CD player won't power on
Views:
277
Posted By
petehall347
Re: Harman Kardon HD200 CD player won't power on
schem shows a main fuse
Forum:
Troubleshooting Power Supplies and Power Supply Design
12-30-2020, 06:58 PM
Replies:
6
AimLite EBST-2L Emergency Light Transformer
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
Samsung Washing machine won't power on dc41-00189a
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
Samsung UN55HU6840 Solid red light, won't turn on
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
Magnetic Stirrer Project Reset
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
Sound and picture but no backlight
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
SR-602 PIR sensor not working. Ideas ?
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...
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