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- 6 -

6. TEST PROCEDURES AND TROUBLESHOOTING

CAUTION

-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL
OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT.
PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITORS AND REMOVING THE LEAD WIRES ON
THE PRIMARY WINDING OF  THE HIGH VOLTAGE TRANSFORM-
ERS FOR LOWER AND UPPER MAGNETRONS.

(SEE FIGURE 3)

A. TEST PROCEDURES

1) Check for resistance: Across the filament ter-

minal of the magnetron with an ohm - meter
on Rx1 scale.

     

                                                   Figure 4

2) Check for resistance: Between each filament

terminal of the magnetron and the chassis
ground with an ohm-meter on highest scale.

COMPONENT

MAGNETRON

HIGH-VOLTAGE
TRANSFORMER

1) Measure the resistance:
    With an ohm-meter on R x1 scale.
  a. Primary winding;
  b. Filament winding;
  c. Secondary winding;
2) Measure the resistance:
    with an ohm-meter on highest scale.
  a. Primary winding to ground;
  b. Filament winding to ground;

CHECKOUT  PROCEDURE

RESULT

Normal reading:
   Less than 1 ohm.

Normal reading:
   Infinite ohms.

Normal reading:

   Approximately 1.0 ohms
   Less than 1 ohm.
   Approximately 60 ohms
Normal reading:

Infinite ohms.
Infinite ohms.

Note: Remove varnish of measured point.

PRIMARY
WINDINGS

  Secondary
  Windings

Filament
Windings

    Figure 3

Figure 5

Figure 6

Содержание EM-C160

Страница 1: ...CE NO SM 640180 See the Service Manual of EM C180US SM 640179 except the items described in this Service Manual PRODUCT CODE NO 437 453 00 CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSE...

Страница 2: ...n the area emitting the highest reading switch the meter to SLOW RESPONSE and take a reading for minimum of three 3 seconds We recommended the pattern outline shown below when the door surface is surv...

Страница 3: ...e door latch is securely locked 3 Tighten the lever stopper screws securely 4 Make sure the interlock monitor switch closes after the interlock switch opens when the door is opened very slowly accordi...

Страница 4: ...ke dielectric or the door seal is dam aged d The door is bent or warped or there is any other visible damage to the oven that may cause microwave energy leakage Note Always keep the seal clean e Make...

Страница 5: ......

Страница 6: ...en each filament terminal of the magnetron and the chassis ground with an ohm meter on highest scale COMPONENT MAGNETRON HIGH VOLTAGE TRANSFORMER 1 Measure the resistance With an ohm meter on R x1 sca...

Страница 7: ...Abnormal reading Indicates continuity or 10 meg ohms from the beginning Normal reading Indicate about middle position in one direction forward and infinite ohms in the reverse direction using ohm mete...

Страница 8: ...K ohms 1 meg ohms When checking the POWER key connect the ohm meter as illustrated below SWITCHES SEE Figure 1 on page 1 CHECKOUT PROCEDURES DOOR OPEN DOOR CLOSED INTERLOCK SWITCH DOOR SENSING SWITCH...

Страница 9: ...2 TP 3 and ground See figure 16 on page 23 Note Proceed with the check of the control P C B to see if any one of the measured values is differ ent from the specified values CHECKOUT PROCEDURE RESULT N...

Страница 10: ...6 Power circuit board See page 7 Control circuit board See page 7 Cooking ope ration will not start Oven does not heat up Door sensing switch See page 7 Interlock switch See page 7 Control circuit boa...

Страница 11: ...not touched within 1 minute after the door is opened or closed Oven stops heating Buzzer continuously beeps Blower motor will stop immediately Oven stops heating Buzzer does not beep Blower motor will...

Страница 12: ...is warm in the following positions 1 Put your hand near the exhaust duct outside of the rear plate to feel the exhaust Never remove the cabinet and rear plate from the oven for your safety when you pu...

Страница 13: ...ge 1 when the primary and secondary interlock switches the relay RL 3 and RL 4 or the interlock monitor switch is adjusted or replaced If the interlock switch the relay RL 3 and RL 4 or the interlock...

Страница 14: ...it of 5mW c u For US After instaling the door check for microwave energy with a leakage detector and confirm that the leakage is the below the limit of 1 mW cm2 at 275cc waterload 5 mW cm2 at no load...

Страница 15: ...uzzer on Press START key All 4 digits will be flashing Press START key again The number 215 shows total cooking time in hours When number key other than 1 or 2 is pressed at step 4 0 appears in displa...

Страница 16: ...ion the following consumable components should be replaced Maintenance light in window display indicates when accumulative cooking time reaches 1 250 hours 1 Magnetron Tube Part No 415 002 6408 2 Prin...

Страница 17: ...nt have special characteristics for safety and must be replaced using parts listed in this manual All service on M W ovens should be performed by a qualified technician using approved testing equipmen...

Страница 18: ...istics for safety and must be replaced using parts listed in this manual All service on M W ovens should be performed by a qualified technician using approved testing equipment Customers should not at...

Страница 19: ......

Страница 20: ...characteristics for safety and must be replaced usnig parts listed in this manual All service on M W ovens should be performed by a qualified technician using approved testing equipment Customers shou...

Страница 21: ...istics for safety and must be replaced using parts listed in this manual All service on M W ovens should be performed by a qualified technician using approved testing equipment Customers should not at...

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Страница 23: ......

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Страница 28: ...C Inside Wiring of Switches Monitor switch Interlock switch Door sensing switch Orange C Brown White Yellow Purple Purple Blue NC Inside L i g h t Blue Orange White Pink NO Inside NO NC White FRONT F...

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