sae-7125
Super Member
a few thermals after 4 days of uptime.
front of chassis, hot spot rear right corner (txf area)
close up of hot area, rear of chassis.
preamp on its side to measure bottom plate (schematic side, note the wrinkles). hottest spot most likely a power resistor for the mute circuit.
in all of these shots the mute function is off (normal audio operation). no inputs and outputs connected, volume at lowest position. a few more days of uptime and this revised repair should be confirmed complete. the only potential loose end might be the original +/- voltage regulators, only time will tell.
and now to finish up a sansui 8080 and its naturally problematic am/fm section (tuner board f-2549 full of carbon comp resistors, plus f-1519 front-end pack). what a nightmare..
not to mention multiple 1n60 germanium diodes to remove.
front of chassis, hot spot rear right corner (txf area)
close up of hot area, rear of chassis.
preamp on its side to measure bottom plate (schematic side, note the wrinkles). hottest spot most likely a power resistor for the mute circuit.
in all of these shots the mute function is off (normal audio operation). no inputs and outputs connected, volume at lowest position. a few more days of uptime and this revised repair should be confirmed complete. the only potential loose end might be the original +/- voltage regulators, only time will tell.
and now to finish up a sansui 8080 and its naturally problematic am/fm section (tuner board f-2549 full of carbon comp resistors, plus f-1519 front-end pack). what a nightmare..
not to mention multiple 1n60 germanium diodes to remove.