ZMM Haskovo Joybook R48 Series Service Manual download pdf (Page 19)

PMOR3021S

PMOR3021B

PMOR3021R

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

1. Key Unit.

NOTE ;

1) Check key unit ribbon connection before replacement.

2) Re-install the hood intake duct R with seven (7) screws.

3) Re-install the outer case (cabinet).

4) Reconnect the power supply cord after the outer case is installed.

5) Run the oven and check all functions.

The following symptoms indicate a defective key unit.

a) When touching the pads, a certain pad produces no signal at all.

b) When touching a number pad, two figures or more are displayed.

c) When touching the pads, sometimes a pad produces no signal.

If the key unit is defective.

1) Disconnect the power supply cord, and then remove outer case.

2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.

4) Replace the key unit.

5) Reconnect all leads removed from components during testing.

6) Re-install the outer case (cabinet).

7) Reconnect the power supply cord after the outer case is installed.

8) Run the oven and check all functions.

2. Control Unit.

The following symptoms indicate a defective control unit. Before replacing the control unit, perform the

Key unit test (Procedure K) to determine if control unit is faulty.

2-1 In connection with pads.

a) When touching the pads, a certain group of pads do not produce a signal.

b) When touching the pads, no pads produce a signal.

2-2 In connection with indicators

a) At a certain digit, all or some segments do not light up.

b) At a certain digit, brightness is low.

c) Only one indicator does not light.

d) The corresponding segments of all digits do not light up; or they continue to light up.

e) Wrong figure appears.

f) A certain group of indicators do not light up.

g) The figure of all digits flicker.

2-3 Other possible problems caused by defective control unit.

a) Buzzer does not sound or continues to sound.

b) Clock does not operate properly.

c) Cooking is not possible.

When testing is completed,

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.

4) Reconnect all leads removed from components during testing.

5) Re-install the hood intake duct R.

6) Re-install the outer case (cabinet).

7) Reconnect the power supply cord after the outer case is installed.

8) Run the oven and check all functions.

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. To discharge high voltage capacitor, wait for 60 seconds.

4. Remove the control panel assembly.

5. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is

making good contact, verify that the stop switch operates properly; that is the contacts are closed when

the door is closed and open when the door is open. If the stop switch is good, disconnect the flat ribbon

cable that connects the key unit to the control unit and make sure the stop switch is closed (either close

the door or short the stop switch connecter). Use the Key unit matrix indicated on the control panel

K KEY UNIT TEST

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ZMM Haskovo Joybook R48 Series Service Manual Page 19

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