Service manuals, schematics, eproms for electrical technicians
STANDARD-TELEPSZUPER EKA-434 CSOVES RADIO.
Type: 
(DJVU)
(DJVU)Size
23.7 KB
23.7 KB
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1
1
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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EKA-434 RADIO. EKA434 CSOVES EKA 434 STANDARD
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Relevant AUDIO forum topics:
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!
szep napot kivanok
Samsung model RCD-750 radio,magno,cd...eleg masziv konstrukcio,erdemes lenne megjavitani,...de van egy hiba-nincs hang,
pontosabban a hangforrasok jok,elkoval athidalva,illetve atcsatolva van hang,tehat meghajto,erosito jol mukodnek,szoval olyan,mintha le lenne nemitva,
...hiaba,rajz nelkul csak idopazarlas,egyszeruen nem talalom a hibat,...pedig tudom-a KSR10 es 2SC3198 tranzisztorok koruli reszben kell keresni,
hat ezert kellene a rajz,vagy tipp,
koszonom
does not start up
Sziasztok, segítséget szeretnék kérni. Adott egy Yamaha rxv559, ami nem kapcsol be.Fő relé nem indul el .Amit meg tudttam nézni,illetve kimérni:
-a 10v a kicsi trafó után meg van
-az ominózus kondi cserélve ami a tápot választja le a tc ic nek
-5v (+5m) , 10v (s10) felmegy a dsp panelre, ott ami van 10/5v os stab kocka az jó
ami hiányzik az a : pdet, res ,5v - ok
A proci megkapja az 5v -kat.
Azt kérdezném hogy ez a kettő hiányzó táp az a dsp panelről jönne vissza, vagy a táp panelről menne fel a dsp panelra.
Esetlegesen van ötlet mit tudok még meg nézni?
válaszotokat előre is köszönöm Tams
-a 10v a kicsi trafó után meg van
-az ominózus kondi cserélve ami a tápot választja le a tc ic nek
-5v (+5m) , 10v (s10) felmegy a dsp panelre, ott ami van 10/5v os stab kocka az jó
ami hiányzik az a : pdet, res ,5v - ok
A proci megkapja az 5v -kat.
Azt kérdezném hogy ez a kettő hiányzó táp az a dsp panelről jönne vissza, vagy a táp panelről menne fel a dsp panelra.
Esetlegesen van ötlet mit tudok még meg nézni?
válaszotokat előre is köszönöm Tams
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