You may have missed the ripple specs, but for any power supply, especially when we're looking at your results, suggests that the ripple on the TM506 is excessive.? A bit of logic suggests that the ripple on the TM504 *is* correct, or acceptable.? Have you compared them?
Your diagnosis seems reasonable.
Harvey
toggle quoted message
Show quoted text
On 1/29/2021 9:04 PM, Michael W. Lynch via groups.io wrote:
I have TM506 that I have had for some time.
I have a PG506 that works but it shows terrible distortion on the top and bottom of the square wave when installed in any compartment the TM506. Just as a test, I inserted the PG506 into both the TM504 and TM501 and it works perfectly, the distortion is gone.
I am attributing this to excess ripple in the DC Supplies of the since the 506 shows a 500-900mV @ 120Hz (unloaded). The distortion on the PG506 square wave looks like a miniature version of the ripple waveform that you read in the TM506. The TM504 and 501 both check with much less ripple that the 506.
Am I diagnosing this correctly or is my observation and reasoning faulty?
The service manuals do not show a specification for ripple that I can find. Have I just missed it or is the spec just not there? What would be an acceptable level of ripple?
Thanks!
