Test Data At A Glance - Sharp R-677W Service Manual

Microwave oven with top and bottom grill
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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
4. Hold the door panel to the door frame with four (4)
screws.
5. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
6. Re-install choke cover to door panel by pushing.
Note: After any service to the door;
(A) Make sure that door sensing switch and primary
latch switch are operating properly. (Refer to
chapter "Test Procedures".).
(B) An approved microwave survey meter should be
used to assure compliance with proper micro-
wave radiation emission limitation standards.
(Refer to Microwave Measurement Procedure.)
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through centre of
latch hole.
2. Deviation of door alignment from horizontal line of
cavity face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter. (Refer to Micro-
wave Measurement Procedure.)
Note: The door on a microwave oven is designed to act
as an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or light-
PARTS
Special fuse
Fuse
Thermal cut-out (HVT)
Thermal cut-out (OVEN)
Grill heating element (top)
Bottom heating element
Oven lamp
High voltage capacitor
Magnetron
Power transformer
WARNING: DISCONNECT THE PLUG WHEN MEASURING RESISTANCE.

TEST DATA AT A GLANCE

SYMBOL
VALUE / DATA
F1
20A / 250V
F2
F 8A
TC1
145°C Off / 115˚C On
TC2
150°C Off / 130˚C On
GH1
Approx. 76 Ω / Insulation resistance > 10 MΩ
GH2
Approx. 132 Ω / Insulation resistance > 10 MΩ
OL
230–240 V 25W
C
AC 2100V 1.02µF
MG
Filament < 1Ω / Filament – chassis ∞ ohm.
T
Filament winding < 1Ω
Secondary winding Approx. 160 Ω / Primary winding Approx. 2.5 Ω
R-677 - 29
tight. Therefore, occasional appearance of mois-
ture, light or sensing of gentle warm air movement
around oven door is not abnormal and do not of
themselves, indicate a leakage of microwave en-
ergy from oven cavity.
PIN
DOOR SUB
ASSEMBLY
DOOR
PANEL
PIN
LOWER
OVEN HINGE
Figure C-8. Door Replacement
...
CONT
UPPER
OVEN HINGE
LOWER
OVEN HINGE
CHOKE COVER

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