Author Topic: pioneer a405 amplifier (patulong) (Read 1228 times)

thoniodee13 · « **on:** September 13, 2011, 09:26:25 PM »

patulong po sa maplifier ko. pioneer 405.
ung isang channel po nya meron sya parang nagpiprito. pagmahina. naririnig ko bigla nalang susulpot. pagmalakas di naman maxado halata.

ano po kaya sira nito?

Philippine Electronics Forum · « **on:** September 13, 2011, 09:26:25 PM »

danny · « **Reply #1 on:** September 14, 2011, 02:35:37 AM »

mga transistors iyan yung maliliit
assuming ok ang ibang stage mo like tone control power supply etc.
kahit ba naka off na volume control mo
nandun pa din???

Philippine Electronics Forum · « **Reply #1 on:** September 14, 2011, 02:35:37 AM »

thoniodee13 · « **Reply #2 on:** September 14, 2011, 07:40:08 AM »

yup ser kahit e volume down kona meron parin nagpiprito. san kaya un?

Philippine Electronics Forum · « **Reply #2 on:** September 14, 2011, 07:40:08 AM »

Johannah Aleksandria · « **Reply #3 on:** September 14, 2011, 08:00:10 AM »

Quote from: thoniodee13 on September 13, 2011, 09:26:25 PM

patulong po sa maplifier ko. pioneer 405.
ung isang channel po nya meron sya parang nagpiprito. pagmahina. naririnig ko bigla nalang susulpot. pagmalakas di naman maxado halata.

ano po kaya sira nito?

Baka sa microphone ckt yan, opamp malamang.

Philippine Electronics Forum · « **Reply #3 on:** September 14, 2011, 08:00:10 AM »

thoniodee13 · « **Reply #4 on:** September 14, 2011, 08:17:34 AM »

sir wala naman po microphone input ung ampli>

Philippine Electronics Forum · « **Reply #4 on:** September 14, 2011, 08:17:34 AM »

j a y k e z · « **Reply #5 on:** September 14, 2011, 08:51:46 AM »

manual sis baka makatulong

hxxp://rapidshare.com/files/196229796/PIONEER_A405_A505_A605.pdf

change hxxp --> http

acer · « **Reply #6 on:** September 14, 2011, 09:51:21 AM »

sundin mo payo na sir danny mukhang madumi na mga legs ng tranie

audiomachines · « **Reply #7 on:** September 14, 2011, 10:14:25 AM »

hula ko ung analog switch

danny · « **Reply #8 on:** September 14, 2011, 10:55:13 AM »

possible din iyan
pag marumi

audiomachines · « **Reply #9 on:** September 14, 2011, 11:16:17 AM »

I mean sir danny ung solid state analog switch n2, best to deal with this is to isolate muna amp section to confirm. pag hindi umingay ung power amp section, nsa preamp section trouble

BhongTech · « **Reply #10 on:** September 14, 2011, 12:12:04 PM »

me power amp na akong nagawa na ganyan din ang problema pati cassette recorder.sa cassette na-trace ko yung switch selection para sa radio to casstte player.ginawa ko binabad ko ang solder sa terminal kung saan may grounded dahil parang nag moist sya.sa amp naman sa defferential input yung mismong board kung saan nakahinang.

acer · « **Reply #11 on:** September 14, 2011, 01:59:25 PM »

karaniwan sa ganitung sakit madumi ang mga paa ng switch o kaya mga paa ng IC
masarap kutkutin lalo na kung nangingitin na

thoniodee13 · « **Reply #12 on:** September 14, 2011, 08:05:27 PM »

cge po mga master susundin ko lahat sinabi nyo.

thanks....

thoniodee13 · « **Reply #13 on:** September 14, 2011, 08:11:05 PM »

sa nakikita ko po sa ampli ko. pioneer a405 ung analog switch lang nya ung main power.

halos digital ung switch ng mga

radio
cd
phono
line

etc...

so ano po ung binangit na maruming switch mga bossing??

audiomachines · « **Reply #14 on:** September 14, 2011, 09:46:17 PM »

un solid state analog switch ang binabangit ko TC91XX, cmos fet ang ginagamit instead na mechanical contacts, my posibility na mag ingay. Kso sbi mo khit full kill ang volume my ingay so tone control section at amp section ang na lng ang suspect. ung Tone Control section ni2 DC Operated yta.

acer · « **Reply #15 on:** September 14, 2011, 10:02:41 PM »

sis try mo isolate input ng amp mo

thoniodee13 · « **Reply #16 on:** September 15, 2011, 12:22:57 PM »

mga sers tinangal ko na po ung output ng tone controler papuntang main amplifier pero meron parin kumakalaskas sa right channel.

saan kaya nanggagaling yung pesteng ingay na yun!

Disabled · « **Reply #17 on:** September 15, 2011, 12:25:36 PM »

hmmm. nsa input stage ata.
short mo ung input to ground.

audiomachines · « **Reply #18 on:** September 15, 2011, 12:29:52 PM »

differential transistor try mo check and ung elect. cap sa NFB. kung my electra freeze spray pwede mo i cold and hot test. papasa kc sa DVM test ung mga inteminent trouble na ganan.

acer · « **Reply #19 on:** September 15, 2011, 02:19:58 PM »

check mo isa isa ang malilit na transistor silipin mo kung mitim na ang mga paa nila

Philippine Electronics Forum · « **Reply #19 on:** September 15, 2011, 02:19:58 PM »

Author Topic: pioneer a405 amplifier (patulong) (Read 1228 times)

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