Sharp R-204EWA Service Manual - Page 19

Procedure, Letter, Component Test, Steps, Occurrence, Cause Or Correction

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R-204EWA TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Foil pattern check and repairs. 1) Disconnect the power supply cord and then remove outer case. 2) Open the door and block it open. 3) Discharge high voltage capacitor. 4) 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". 5) 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 563Ω ± 10%). If any abnormal condition is detected, replace the control unit. RY1 c (J1) b d a P 1 6) Reconnect all leads removed from components during testing. RY2 7) Re-install the outer case (cabinet). 8) Reconnect the power supply cord after the outer case is installed. 9) 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. 2) Open the door and block it open. 3) Discharge high voltage capacitor. 4) Disconnect the leads to the primary of the power transformer. 5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. 6) After that procedure, re-connect the power supply cord. 7) Follow the troubleshooting guide given below for repair. STEPS 1 2 OCCURRENCE The rated AC voltage is not present between Pin No. 3 of the 2-pin connector (A) and the common terminal of the relay RY2. The rated AC voltage is present at primary side of low voltage transformer. CAUSE OR CORRECTION Check supply voltage and oven power cord. Low voltage transformer or secondary circuit defective. Check and replace. 8) Disconnect the power supply cord and then remove outer case. 9) Open the door and block it open. 10) Discharge high voltage capacitor. 11) Reconnect all leads removed from components during testing. 12) Re-install the outer case (cabinet). 13) Reconnect the power supply cord after the outer case is installed. 14) Run the oven and check all functions. 17

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17
R-204EWA
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
1.
Foil pattern check and repairs.
1)
Disconnect the power supply cord and then remove outer case.
2)
Open the door and block it open.
3)
Discharge high voltage capacitor.
4)
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".
5) 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 563
Ω
±
10%). If any abnormal condition is detected,
replace the control unit.
6) Reconnect all leads removed from
components during testing.
7)
Re-install the outer case (cabinet).
8)
Reconnect the power supply cord after the outer case is installed.
9)
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.
2)
Open the door and block it open.
3)
Discharge high voltage capacitor.
4)
Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6)
After that procedure, re-connect the power supply cord.
7)
Follow the troubleshooting guide given below for repair.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
The rated AC voltage is not present between
1
Pin No. 3 of the 2-pin connector (A) and the
Check supply voltage and oven power cord.
common terminal of the relay RY2.
2
The rated AC voltage is present at primary
Low voltage transformer or secondary circuit defective.
side of low voltage transformer.
Check and replace.
8) Disconnect the power supply cord and then remove outer case.
9) Open the door and block it open.
10) Discharge high voltage capacitor.
11) Reconnect all leads removed from components during testing.
12) Re-install the outer case (cabinet).
13) Reconnect the power supply cord after the outer case is installed.
14) Run the oven and check all functions.
1
P
RY1
a
b
c
d
RY2
(J1)