Panasonic NE-992 Service Manual page 32

NE-972__ |
{TROUBLE 10] Microwave cooking program works normally, but convection cooking and/or grill cooking programs
do not.
NOTE: Refer to cooking pattem of convection cooking (Fig. 4) and/or grill cooking (Fig. 5)
1. Convection heater does not heat at ail.
No continuity
CAUSE REMEDY
Open heater Replace
Disconnect 2 lead wires from
convection heater terminals
and check continuity of the
heater
Approx. 469 (Normal)
Faulty contacts of power relay
Approx. 18V 00 3 or open relay coil
plied to power relay 3 coil
(terminais 5 and 6)
(See Fig. 28A & 28B)
OV Defective D.P.C. Repair or replace
2. Grill heater does not heat at all.
No continuity
REMEDY
Open heater Replace
Disconnect 2 lead wires from
grill heater terminals and
check continuity of the heater
Approx. 37 (Normal)
Faulty contacts of power relay
Approx. 18V DC 2 or open relay coil
plied to power relay 2 coil
(terminals 5 and 6)
(See Fig. 28A & 28B)
OV Defective D.P.C. Repair or replace
{TROUBLE 11] Combination cooking is not working in correct order
Defective DPC
RESULT REMEDY
Repair or replace
Check timing period of DC
voltage being applied to pow-
er relay 2, 3 and 5 (Refer to
the description of combination
cooking and Fig. 6B on page
14,
(TROUBLE 12] "FF FF" appears in display window when convection, grill or combination cooking.
tet Short or open oven temp
0Q f Rep!
Check continuity of oven temp
sensor with CN3 connector
Defective DPC Repair or replace
unplugged.
loose connection of CN3