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Technics SU-G70 Integrated

Okay so i just found a su-g70 and everything works but the surround pcb. When the unit is powered on the two fuses for the rear channels blow instantly. When i disconnected the power supply from the surround pcb and pluged it in the fuses didnt blow. So im guessing that means nothing is wrong with the main pcb or power supply. I tried to jump the place where the fuses go with a screw (stupid i know you dont have to tell me) and a constant buzz came from the speakers. Can anybody help me out. I cant even find a replacement board because idk what its called
 
Check rectifier diodes on surround pcb.... check for shorts in SVI3100 (surround power ic) pins 2 &3 (power supply in) check also for short on pin 1&2 1&3 2&4 3&4 (collector Emitter short)

SVI3100 series 1st 4 pins

1 Lch out
2 +V
3 -V
4 Rch out

If ic to be replaced, go to SVI3102 aka RSN3502 if SVI series unobtanium
 
SVI2004A said:
Check rectifier diodes on surround pcb.... check for shorts in SVI3100 (surround power ic) pins 2 &3 (power supply in) check also for short on pin 1&2 1&3 2&4 3&4 (collector Emitter short)

SVI3100 series 1st 4 pins

1 Lch out
2 +V
3 -V
4 Rch out

If ic to be replaced, go to SVI3102 aka RSN3502 if SVI series unobtanium
Click to expand...
do you know where i could find a whole pcb
 
I had one of these. If the fan dies the amp dies, I would replace the fan just for peace of mind if you want to keep the amp. The heatsink is small, but it's aluminum which has great heat conductivity and there's a sh#tload of surface area for dissipation IF THE FAN is operating. I liked the sound, but ended up getting rid of the amp as, well, it kinda' looks like BPC.
 
I still have my SU-G70 and it still works great, and sounds awesome as it did 30 yrs ago. Hooked up a new turntable to it and vinyl sounds amazing.
 
I'm just a consumer trying to get my technics stereo system working after being boxed up for 20 yrs. It's a SU-G70 Amp. System has few hrs on it and worked fine when packed up. Now I have no sound and all the Manuel's show that there should be pins where it says" Preout/mailing terminals of Amp. Use this terminal to operate the Amp as an independent preamplifier Do not remove these pins or no sound will be had. Is this my problem and can I use cables instead of pins. I'm sure I packed everything in boxes and I have neither pins or extra cables. Surround sound works fineScreenshot_20221109_052057_Google PDF Viewer.jpg
 
Hi everyone! I just got a su-G70 , I go no relay click no sound output , nothing move on the screen , those sanyo IC seems to fail alot , but I can't find SVI 3100 B and SVI 3206 D datasheet , any hint could help ! thanks in advance !
 
WeLoveMusic said:
Hi everyone! I just got a su-G70 , I go no relay click no sound output , nothing move on the screen , those sanyo IC seems to fail alot , but I can't find SVI 3100 B and SVI 3206 D datasheet , any hint could help ! thanks in advance !
Click to expand...
re worked all connection solder joints , ics , relay , I was looking at some readings i get 63v at the caps , mostly nothing but a 14v at svi3001b , 63 and 46 at 3206 , kind of lost in at where tk start witout the service manual , its getting late too
 
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