Service manuals, schematics, eproms for electrical technicians
MULLARD MA3
Type: 
(PDF)
(PDF)Size
3.9 MB
3.9 MB
Page
3
3
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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MULLARD MA-3 MA3 MA
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Relevant AUDIO forum topics:
Sziasztok!
Kaptam egy hibás Rega Elex erősítőt, a tulajdonos ki akarta dobni. Első ránézésre cserélni kell a végtranzisztorokat(Sanken 2SA1186/2SC2837 páros), a meghajtó tranzisztorokat (BC639, BC640), 2 db 0.47 ohmos emitter ellenállást, 2 db ZTX300 tranzisztort.
A kapcsolási rajzot feltöltöttem. Szerintetek érdemes foglalkozni vele?
Üdv,
Endre
Sziasztok!
Ennek a készüléknek a végfokában égtek el alkatrészek, melyek pontos értékeit igazából a doksiból lehetne kiolvasni, de amit a tanyán és egyéb helyeken találtam sajna a végfok eléggé sematikus és nincs részletesen kirajzolva.Ha valaki erről tudna használható rajzot küldeni előre is köszönöm.
Üdv.: Laci
Sziasztok!
A képen látható futóműből a nagy fehér fogaskerékre lenne szükségem.
Ha valaki tud segíteni előre is köszönöm!
Üdv. : laci
A képen látható futóműből a nagy fehér fogaskerékre lenne szükségem.
Ha valaki tud segíteni előre is köszönöm!
Üdv. : laci
Given:
Victor TT-71, neon lamp does not light, speed is lower than normal. This is subsequent some short circuit the owner does inside the device. No further details.
I found out the VICTOR QL7 have the same motor driver amd I downloaded the service manual that I attached here in case this manual is not already uploaded.
Looking at the diagrams I found out that at TP3 (same with pin5 of IC803) instead if that rectangular signal, I have nothing but 5VDC and a negative or positive short spike whenever I'm starting or stopping the motor and
Under the circumstances I suspect IC803 is defective. The bad thing, IC803 is NPC SC8043. Also I wonder if the crystal is fine (except that I wonder what can be wrong with a crystal after some short circuit).
Does anybody have any more suggestion?
Also, where can NPC SC4043 be sourced? Also, a crystal 9.054MHz?
Thanks in advance,
Corneliu
Victor TT-71, neon lamp does not light, speed is lower than normal. This is subsequent some short circuit the owner does inside the device. No further details.
I found out the VICTOR QL7 have the same motor driver amd I downloaded the service manual that I attached here in case this manual is not already uploaded.
Looking at the diagrams I found out that at TP3 (same with pin5 of IC803) instead if that rectangular signal, I have nothing but 5VDC and a negative or positive short spike whenever I'm starting or stopping the motor and
Under the circumstances I suspect IC803 is defective. The bad thing, IC803 is NPC SC8043. Also I wonder if the crystal is fine (except that I wonder what can be wrong with a crystal after some short circuit).
Does anybody have any more suggestion?
Also, where can NPC SC4043 be sourced? Also, a crystal 9.054MHz?
Thanks in advance,
Corneliu
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