Inverter Power Supply (U); Steam Sensor And Digital Programmer Circuit - Panasonic NN-T559WB Service Manual

7.5 Inverter Power Supply (U)

DO NOT try to REPAIR this H.V. Inverter power supply(U). Replace as whole H.V. Inverter(U) Unit.
HEAT SINK
(RECTIFIER BRIDGE)
CHOKE COIL
SAND BAR
RESISTOR
CUSTOM I.C.
PHOTO COUPLER
CN 701
CURRENT TRANSFORMER
7.6 Inverter Power supply(U)
Do not attempt to make any measurements in the high voltage
circuitry of the inverter or magnetron.
See Troubleshooting of inverter circuit and magnetron on Pages
19 and 20 to determine if the inverter power supply is
functioning.
7.7 Steam Sensor and digital programmer
circuit
Do not touch any parts of the cicuitry on the digital
programmer circuit since static electric discharge may
damage this control panel.
Always ground yourself while working on this panel to
discharge any static builtt up on your body.
In order to determine if the steam sensor programme of the
digital programmer circuit is in working order or not, do the
fllowing test.
1. Place a water load (150cc) in the oven.
2. Set Auto Sensor Program 4 Fresh Fish.
3. Tap Start pad.
4. Steam Sensor detects steam about 1 minute 30 seconds to 4
minutes after the Start pad is tapped.
5. T1 time cooking automatically switches to remaining time
cooking. (T2)
6. The remaining cooking time (T2) appears in the display
window. If the following cooking times appear Steam Sensor
function is normal.
CN 702
INVERTER POWER SUPPLY DIAGRAM
NEW H.V.
WARNING
CAUTION
T1 TIME
1 Min. 30 Sec. ~ 4 Min.
16
HIGH VOLTAGE
TRANSFORMER
FILM CAPACITORS
PRIMARY WINDINGS
HIGH VOLTAGE DIODES
SECONDARY WINDINGS
CN 703
HIGH VOLTAGE CAPACITORS
T2 TIME
(Remaining cooking time)
8 Sec. ~ 23 Sec.