Digital Programmer Circuit (D.p.c.) Du And Low Voltage Transformer; Inverter - Panasonic NN-CS597S APH Service Manual

2. When installing the new key board membrane, make
sure that the surface of escutcheon base is clean to
prevent a malfunction or shorted contacts.
6.3. Digital programmer circuit
(D.P.C.) DU and low voltage
transformer
1. Disconnect connectors CN1 & CN2 from D.P.C. board DU
(power supply board).
2. Remove 2 screws holding DU board (power supply board)
cover on inverter reinforcement/grounding bracket A.
3. Remove 2 screws holding D.P.C board DU (power supply
board) on DU board cover.
4. Remove D.P.C. board DU (power supply board).
5. Using solder wick or a desoldering tool and 30W soldering
iron carefully to remove all solder from the terminal pins of
the low voltage transformer and/or power relays.
CAUTION:
Do not use a soldering iron or desoldering tool of
more than 30 watts on D.P.C. contacts.
6. With all the terminal pins cleaned and separated from
D.P.C. contacts, remove the defective transformer/power
relays. Replace components making sure all terminal pins
are inserted completely, then resolder all terminal contacts
carefully.
6.4. H.V. Inverter
1. Discharge high voltage remaining in high voltage capacitor.
2. Remove 2 screws
reinforcement/grounding bracket A on oven cavity.
3. Remove 2 screws holding inverter reinforcement bracket B
on cavity top plate.
4. Remove 1 screw holding oven thermistor on cavity top
plate.
5. Release lead wire harness from locking tabs on Inverter
bracket A.
6. Disconnect 2 lead wires from fan motor terminals.
7. Disconnect 2 lead wires from the harness of noise filter (U),
which are connected to both "Netural" and "live" lead wires
of oven circuit breaker (black and white housing
connectors).
8. Disconnect 2 lead wires form oven circuit breaker harness
connecting to main lead wire harness (blue and yellow
housing connectors).
9. Disconnect 2 high voltage lead wires from magnetron
filament terminals.
10. Unplug connector CN701 & CN702 from H.V. Inverter
board.
11. Remove 1 screw holding inverter air guide bracket on
reinforcement bracket B, then release locking tabs, detach
air guide bracket.
12. Release locking tabs connecting Inverter bracket A with
Inverter bracket B detach bracket A & B.
13. Remove 2 screws holding H.V. Inverter on Inverter bracket.
15
NN-CS597S
holding the

inverter