Membrane Key Board (Membrane Switch Assembly); Inverter Power Supply (U) - Panasonic NN­GS595A Service Manual

10/24/2016
5.4 Membrane key board (Membrane switch assembly)
Check continuity between switch terminals, by tapping an appropriate pad on the key board. The contacts assignment of the
respective pads on the key board is as shown in digital programmer circuit. (Refer to Mini Manual)
5.5 Inverter power supply (U)
DO NOT try to REPAIR H.V. Inverter power supply (U). Replace complete H.V. Inverter(U) Unit.
DANGER HIGH VOLTAGE
Test if failure codes of H95, H97 or H98 appear by doing the following procedure. It is recommended to use an AC line input current
Ampere meter for testing.
Test1
1. Program DPC.
1. Press Timer/Clock pad twice.
2. Press Start pad once.
3. Press Micro Power pad once.
2. Place 1 liter of water load into oven cavity.
3. Unplug 2 pin H.V. lead wire connector CN703 from magnetron tube.
4. Program oven at High power for 1 minute and press start.
1. After approximately 23 seconds, oven stops.
2. During oven operation, input current is approximately 0.5 to 1A. If both a and b are OK, proceed to test 2.
Unplug CN703
Test2
Continued from Test 1
1. Unplug 3 pin connector CN701. CN703 remains unplugged.
2. Program oven at High power for 1 minute and press start.
1. After approximately 3 seconds, oven stops.
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INPUT AMPERE
0.5 to 1A Oven stops in 23 seconds after started.
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FAILURE CODE
2/3