hi everyone. new to this forum. been in the electronics field on and off since the mid 60’s and always learning
i’ll tackle almost any electronic device with good outcome.
i’ve been reading some old posts about the 684 with sound advice from some seasoned tech’s.
my present repair is my own xr-684.
it started to need multiple on & off cycles to finally power it up and would work fine till the next time i applied power.
after about 8 months of moderate use (2-4 times a week), it finally failed to power up. removed amp pcb to t/s. regulators were very low outputs.
final heat sink close to power supply got hot so, i shut it down. so as to not blow any finals, i removed them. reapplied power. still low voltage on both reg’s so i removed the 4 ic’s ion the board. regulators came up to normal. i find ghat plugging the ic’s back in creats load on the regulators again.
I’ll resume bench tests this coming week.
- john
i’ll tackle almost any electronic device with good outcome.
i’ve been reading some old posts about the 684 with sound advice from some seasoned tech’s.
my present repair is my own xr-684.
it started to need multiple on & off cycles to finally power it up and would work fine till the next time i applied power.
after about 8 months of moderate use (2-4 times a week), it finally failed to power up. removed amp pcb to t/s. regulators were very low outputs.
final heat sink close to power supply got hot so, i shut it down. so as to not blow any finals, i removed them. reapplied power. still low voltage on both reg’s so i removed the 4 ic’s ion the board. regulators came up to normal. i find ghat plugging the ic’s back in creats load on the regulators again.
I’ll resume bench tests this coming week.
- john