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YAESU YO-301 MONITORSCOPE INSTRUCTION SCH

METER - SERVICE MANUAL
Type: (PDF)
Size
3.1 MB
Page
26
Category
METER
SERVICE MANUAL
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  • Also known:
    YAESU YO-301 YO301 YO 301
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Relevant METER forum topics:
Looking for Metrix MX53 Multimeter schematic
Hi there,
After many years of good services, I made a mistake while measuring UHV (ultra high voltagel with my  METRIX MX53) . I was measuring a voltage around 2500V DC with all the safety required, using a divider, to get only 1/50th of the voltage as I did many times.
But for some unknown reasons (I'm rarely distracted when playing with such letal voltage) , I didn't connect my clip at the divider but at the full voltage. 
You understand that the MX53 didn't appreciate it. 
I opened the multimeter, which is kind of sport as not as easy as it looks and found a resistor R1 (may be 200 ohms 5%, hard to read) completely exploded. I replaced it. I also found that 2 of the four varistors were shorted, changed them, I checked all the transistors, mostly SMD, but they all look fine as far as I can see. However, the multimeter is still not responding. 
I have also found 2 SMD diodes that could also be shorted and need to check them more thoroughly... 
I have very few chances to fix the meter but if I could put my hand on its schematic, It would be easier to track down the culprit, hoping it's not the proprietary chip in it. 
So, if someone have (or could lead me to a link to it) the circuit drawing of the MX53, preferably, or the MX52 or MX54 which look close to it, just a few functions more and the PCB looks common to both as the MX53 has some locations not populated with components, it would help me to try to save my old companion! 
Thanks in advance, any help much appreciated.!
Nota: METRIX is a French company, was also know as Chauvin-Arnoux.
Regards from France...! 
EMG TR-4664 nagyfeszültsége húz (Megszárítva)
Sziasztok! Sikerült falura költöznöm, és a szkópomat a vályogház páratartalma átjárta. Jó három hónapja nem volt bekapcsolva. Tagnaptól a cserépkályha tetején tartom, de hátha van valakinek ötlete a kiszárításhoz. Megköszönném! üdv. Tropfehérke
Iwatsu SS-7610 oszcilloszkóp eltérítés hiba
Sziasztok! Iwatsu SS-7610 tip. szkópnak eltérítési hibája van. A kijelzőről készített fényképet csatolom. A kapcsolóüzemű tápot már megcsináltam, tápfeszek megvannak (+12V, -12V, +5V, +50V). Feltételezem, hogy a 2KV is rendben van. A kérdésem, hogy merre menjek tovább. Ha valaki tudna segíteni megköszönném. Köszi:pandora
Mastech my-66 multiméter kijelző nullázása.
Sziasztok !
Mastech my-66 multiméterem  DC  illetve AC voltmérő állásban nem nullát,  hanem változó értéket mutat, ha a két mérőcsúcsot összeérintem lenullázózódik , jól is mér, csak zavar . A  mérőmüszer  (multiméter) automata méréshatár váltós, mindig mutat pár 10 mV-ot, találkozott e már valaki ilyen problémával, mi lehet a hiba oka. Az érintkezőket, a nyákot letakarítottam, a hiba továbbra is fenn áll.
Balázs
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Válaszd ki a megfelelő fórumot, majd adj neki címet és írd be a kérdésed.
A téma címe tartalmazza a hibás eszköz márkáját és típusát. Szintén tartalmazza röviden a problémát.
pl: ACER AL1711 monitor képernyője 5 másodperc után kikapcsol

A helytelenül elnevezett topik felfüggesztésre, majd 48 óra után törlésre kerül! Felfüggesztett állapotban nem tudnak mások addig hozzászólni, amíg ki nem javítod a címet!
A hibás cím utólagos javítása (48 órán belül) a "Szerkesztés" fülre kattintva végezhető el.

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