Duke DSO 500, Service Manual

Page: 67 / 80

67
TROUBLESHOOTING
Error Codes
INFORMATION TO BE PROVIDED
Figure Error Code Displays
Troubleshooting Table
The troubleshooting table provides a list of Symptoms in the left-hand column. The center column
lists the probable causes for the indicated Symptom. The right-hand column provides procedures to
remedy the Symptom.
TROUBLESHOOTING TABLE
Oven will not
operate(Magnetrons)
SYMPTOM POSSIBLE CAUSE REMEDY
Incoming power supply.
Oven door improperly
closed.
Door interlock switches.
Door interlock circuit
mechanical relays
Check all electrical connections.
Check master switch.
Check for power at wall receptacle.
Check main fuse block.
Insure that oven door is fully closed and
latched. Check for interference. Check
door seal.
Inspect door latch switches (4) to insure
that the switches are mechanically
actuating when door is closed and
adjust if necessary. Insure L1 output
from switch “P” and “S” and no output
from switch “M” with door in closed
position. At the electronic control board,
check for closed circuit at J1 terminals
8 and 9.
With oven door in the closed position
check for supply voltage at the coil
terminals of relays K6 and K8. If sup-
ply voltage is not present trace wiring
back through door switches and master
switch. If supply voltage is present check
for output voltage at relays K6 and K8.
If output voltage is not present replace
the defective mechanical relay.
TROUBLESHOOTING