Service manuals, schematics, eproms for electrical technicians
HEATHKIT AA-1640 SCH.
Type: 
(DJVU)
(DJVU)Size
57.6 KB
57.6 KB
Page
3
3
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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HEATHKIT AA-1640 AA1640 SCH. AA 1640
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Relevant AUDIO forum topics:
Sziasztok!
Harman Kardon avr660-hoz keresnék firmware-t, sajnsos a harman honlapján már nem elérhető.Mindegy melyik verzió, régi is jó lenne, van egy fagyott alaplapom, hátha csak firm kellene neki.
Harman Kardon avr660-hoz keresnék firmware-t, sajnsos a harman honlapján már nem elérhető.Mindegy melyik verzió, régi is jó lenne, van egy fagyott alaplapom, hátha csak firm kellene neki.
Hi All,
Does anyone have any experience of working on this radio, its the small Grundig with a leather case designed by F.A. Porsche.
I have recently repaired one with corroded battery contacts which had obviously not worked for many years.
Its now working perfectly on FM, but MW and SW1 and SW2 have no reception, just noise.
If I leave the radio connected to a 5v power supply for many hours it does actually get some reception on AM, but its not consistent. I'm thinking the fault is somewhere in the 'front end', oscillator stage perhaps.
I have checked the AM coils and wave selector switch are OK and everything is visually in excellent condition.
Reading various reviews on this radio confirms they were sold very cheaply in the USA and many customers have complained there is little or no sensitivity on AM, whilst others say it works perfectly. This makes me wonder if there is a common fault on these which someone may know, before I start with my test equipment to try to find the problem...
Any advice would be much appreciated!
Does anyone have any experience of working on this radio, its the small Grundig with a leather case designed by F.A. Porsche.
I have recently repaired one with corroded battery contacts which had obviously not worked for many years.
Its now working perfectly on FM, but MW and SW1 and SW2 have no reception, just noise.
If I leave the radio connected to a 5v power supply for many hours it does actually get some reception on AM, but its not consistent. I'm thinking the fault is somewhere in the 'front end', oscillator stage perhaps.
I have checked the AM coils and wave selector switch are OK and everything is visually in excellent condition.
Reading various reviews on this radio confirms they were sold very cheaply in the USA and many customers have complained there is little or no sensitivity on AM, whilst others say it works perfectly. This makes me wonder if there is a common fault on these which someone may know, before I start with my test equipment to try to find the problem...
Any advice would be much appreciated!
Sziasztok
Kaptam egy kidobásra szánt Videoton hangfalpárt, amiben a mély habperem természetesen szét volt porladva.
Mivel 6eft / db a peremcsere, ezért vettem 1 pár újat, s kicserélem én..
Kicsit szívás volt, de kb jó lett,,
Viszont.. Most szedtem szét a hangfalat..
De ez nem Videoton H31 -es hangszóró.
Látszólag gyárilag ez van benne, de sem a felirat, sem a kosár nem stimmel..
A habperem tökéletesen illeszkedett, de láttam már 1-2 vidi mélyet, ez nem az,.
Sem a kosár, sem a felirat nem stimmel.. S szerintem a membrán sem, a vidiben nincsenek redők,,
A google nem segített..
A 20 cm-es RFT mélynek van ilyen körökkel megoldott kosara..
Valaki ismeri ezt a típust, mi lehet ez?
RFT? Tesla? vagy valami bolgár csoda?
Lehet ez gyárilag a vidi hangfalban?
köszi
L
Kaptam egy kidobásra szánt Videoton hangfalpárt, amiben a mély habperem természetesen szét volt porladva.
Mivel 6eft / db a peremcsere, ezért vettem 1 pár újat, s kicserélem én..
Kicsit szívás volt, de kb jó lett,,
Viszont.. Most szedtem szét a hangfalat..
De ez nem Videoton H31 -es hangszóró.
Látszólag gyárilag ez van benne, de sem a felirat, sem a kosár nem stimmel..
A habperem tökéletesen illeszkedett, de láttam már 1-2 vidi mélyet, ez nem az,.
Sem a kosár, sem a felirat nem stimmel.. S szerintem a membrán sem, a vidiben nincsenek redők,,
A google nem segített..
A 20 cm-es RFT mélynek van ilyen körökkel megoldott kosara..
Valaki ismeri ezt a típust, mi lehet ez?
RFT? Tesla? vagy valami bolgár csoda?
Lehet ez gyárilag a vidi hangfalban?
köszi
L
Tiszteletem!
A fent nevezett készülékben igen csak tönkre ment minden. A legnegyobb problémám az hogy a meghajtó smd tranyóknak nem találom a pontos tipusát.
Kódja p93 és p16.
Első körben ebben kérnék segítséget a tovább jutáshoz.
Köszönöm
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