ZMM Haskovo Joybook R48 Series Service Manual download pdf (Page 21)

PMOR3021S

PMOR3021B

PMOR3021R

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

(6) Touch the “ START ” button.

(7) The oven is in Easy defrost cooking condition.

(8) The oven will operate as follows.

Menu 1ST STAGE 2ND STAGE

Steaks/Chops LEVEL TIME LEVEL TIME

0.5lbs 40% 57sec. 40% 22sec.

(9) If improper operation is indicated, the control unit is probably defective and should be checked.

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB,

this foil pattern acts as a fuse.

1. Foil pattern check and repairs.

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 unit, referring to the procedure of “ CONTROL PANEL ASSEMBLY, CONTROL

UNIT AND KEY UNIT REMOVAL ”.

5) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 Only pattern at “a” is broken. *Insert jumper wire J1 and solder.

2 Pattern at “a” and “b” are broken. *Insert the coil RCILF2003YAZZ between “c” and “d”.

6) Make a visual inspection of the varistor. Check

for burned damage and examine the

transformer with a tester for the presence of

layer short-circuit (check the primary coil

resistance which is approximately 160Ω ±

10%). If any abnormal condition is detected,

replace the control unit.

7) Reconnect all leads removed from components

during testing.

8) Re-install the control unit to the control panel

and re-install the control panel to the oven.

9) Reconnect the power supply cord.

10) Run the oven and check all functions.

2. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs

are finished.

1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of “HOOD

LOUVER REMOVAL”, “REMOVAL OF OVEN FROM WAL ” and “OUTER CASE REMOVAL”.

2) Open the door and block it open.

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

4) Remove the hood intake duct R.

5) Disconnect the leads to the primary of the inverter unit.

6) Ensure that these leads remain isolated from other components and oven chassis by using insulation

tape.

7) After that procedure, re-connect the power supply cord.

8) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between

1 the Pin No. 3 of the 3 pin connector (C) and Check supply voltage and oven power cord.

the normal open terminal of the relay RY1.

The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

side of low voltage transformer. Check and replace the control unit.

N FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

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ZMM Haskovo Joybook R48 Series Service Manual Page 21

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