Hey Dave,
Do you have the service manual already (
)? If so, the first thing to
check is power supply voltages. I see the "AC INPUT, TRANSFORMER & FUSE
BOARD" on page 93, schematic <1>. In your shoes, I'd check all the AC
voltages from the transformer and validate that all the fuses are good as a
start.
Assuming those are good, you can move on to page 94, schematic <2>. This is
the part of the circuitry that's responsible for generating the voltage
rails for the control circuitry, and for selecting the appropriate AC
voltage tap for the expected output voltage.
Check easy things to start, like is there a reasonable DC voltage after
each diode bridge, are the +24V, -24V, +15V and -15V DC voltages correct.
Note that you have two independent channels, so you have to be careful to
measure the voltages against their respective ground/zero points.
I find it helpful to go about this in an organized manner, by e.g. printing
the schematic and annotating the printout with the readings.
Siggi
On Fri, Aug 16, 2019 at 7:34 AM daven9ooq via Groups.Io <daven9ooq=
[email protected]> wrote:
Hi everyone I recently purchased a Tektronix PS280 power supply for my
bench projects, just looked at all the old posts on the 280 ,there seem to
be an awefull lot of bad ones on ebay as they show no voltage readings or
low volts on the variable channels.
That is the problem with mine, after doing a full recap on the two
variable channels , still have voltage issues low to no volts .
I dont have much experience troubleshooting just a basic electronics
background and need help troubleshooting this supply please!
Many thanks in advance
Dave.
