Panasonic NN-S560WF Manual De Usuario

Trouble Related to Digital Programmer Circuit

SYMPTOM

No display when oven is first plugged in.

Oven is dead.

CAUSE/CORRECTIONS

STEP 2

Shorted Circuit of ZNR,

L.V.T., Oven Lamp etc.

Replace DPC

LVT
➝ Step 3

ZD10, Q10
➝ Step 4

IC-220
➝ IC-1, CX320

STEP

CHECK

Fuse pattern of DPC

Low voltage transformer (LVT)

secondary voltage

IC-1 pin 8 voltage

(Emitter of Q10)

IC-1 pin 10 voltage

(15 pin of IC-220)

RESULT

Normal

Open (NOTE)

Abnormal 0V

Normal

Abnormal

Normal = 5V

Abnormal

Normal

NOTE

Procedure of fuse pattern repairing is as follows:

1. When the fuse pattern (PF2) opens.

(1) Remove the jumper wire (PF1).

(2) Insert the removed jumper wire (PF1) to “(PF2)” position and solder it. If both “PF1” and “PF2” fuse patterns are open, please replace DPC.

2. When the fuse pattern (PF4) opens.

(1) Remove the jumper wire (PF3).

(2) Insert the removed jumper wire (PF3) to “(PF4)” position and solder it. If both “PF3” and “PF4” fuse patterns are open, please replace DPC.

NOTE:* At the time of these repairs, make visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-

circuit (check primary coil resistance).

If any abnormal condition is detected, replace the defective parts.

SYMPTOM

No key input

No beep sound

Power relay A(RY-2) does not turn on

even though the program has been set

and the start pad is tapped

No microwave oscillation at any power

setting

Dark or unclear display

Missing or lighting of unnecessary

segment

H97/H98 appears in window and oven

stops operation. Program High power

for 1 minute and conduct following test

quickly, unless H97/H98 appears and

oven stops.

RESULT

Abnormal

Normal

Abnormal

Normal

Abnormal

Normal = 5V

Still not turn on

RY-2 turns on

Abnormal

Normal

5---5V, 15---5V

Abnormal

Normal

Abnormal

Normal

Abnormal

Approx. AC 3V

CHECK

Membrane switch continuity

IC-1 pin 31 voltage

IC-1 pin 32 voltage while operation

Short circuit between pin 6 and pin

16 of IC-220

IC-1 pin 38 and pin 39 voltages while

operation at high power

Q220 transistor

Replace display and check operation

Replace IC-1 and check operation

Unplug CN702(2 pin) connector and

measure voltage between terminals

Unplug CN701(3 pin) connector and

measure pin 1 voltage

CAUSE/CORRECTIONS

Membrane switch

IC-1

BZ, IC-220

IC-1
➝ Step 2
RY-2

IC-220

IC-1
➝ Step 2

Q220

IC-220, RY-1

DISPLAY

IC-1

DISPLAY

DPC

Magnetron

STEP

NEW H.V.

TO BE CONTINUED FOR SENSOR MODELS

Steam sensor terminal voltage by

using high impedance tester (20k

Ω/

V), when breathe on metal surface of

sensor

Auto sensor cooking does not operate

normally.

(Steam Sensor cooking does not detect

steam from foods.)

Abnormal = 0V

Normal > 10~30mV

Steam sensor

IC-1

- 23 -

AC line voltage of 120V

2. DPC/Power Relay

1. Latch Switch

➝ Step 2