Legamaster PTX-8500 UHD, Service Manual

Page: 17 / 21

Page 17/21
Service Manual: PTX8500 UHD
1. Check the FUSE is OPEN or SHORT.
a.
Turn off the power
b.
Check the FUSE
i.
If the FUSE is “SHORT”( 0Ω
) then go to
step2
ii.
If the FUSE is “OPEN” then replacement
a new FUSE
c.
Turn on the power 5 seconds then go to step
a. again.
d.
If the FUSE is “OPEN” again then the PSU
has been failure.
2. Check P802 (DC 12V)
a.
Turn on the power and check pin13(12V) to
pin16(GND) ,If measured 12 Volts, go to
Step
3
b.
If not then the PSU has been failure.
3. Check P803/P804 (DC 24V)
a. Turn on the power and check the pin1(24V)
to pin10(GND) of P803/ P804
i.
It must output 24 volts.
ii.
If not then the PSU has been failure.
a
c
b
a
a