Panasonic NE-7910 Service Manual page 29

[TROUBLE 3] Display shows all figures set, but microwave oven does not start cooking even though
desired power and time are set and start pad (or button) is tapped.
CONDITION CHECK RESULT | CAUSE REMEDY
|
1.| Fan motor Check continuity of No Malfunction of - Adjust or replace
and oven latch switch A continuity latch switch A
lamp do
not turn on —
Check continuity of No Malfunction of Adjust or repaice
[| latch switch B continuity latch switch B
EN Check continuity of No Malfunction of _,| Replace
thermal cutout (oven) continuity therma! cutout |
Check D.C. voltage L—»fov Defective digital [-»| Replace ©
being supplied to programmer
power relay coil circuit
Ly! (between terminal
Faulty contacts — L4/ Repaice
7 and 8) with lead
of power relay or
wire connected to t+—>| 20 VD.C.
open relay coil
relay coil terminals
Fan motor Check continuity of No a3: Open winding lI Replace
and oven lamp ? primary winding or continuity
turn on for digital programmer
very moment circuit winding of
when the start high voltage trams- | Normal | »| Defective digital
pad (button) former programmer
is tapped circuit
Replace
|
Refer to component
test procedure on
page 32.