Diagnosis Method Of Failure Around Pwb - Sharp SJ-PT56R-HS Service Manual

[4] DIAGNOSIS METHOD OF FAILURE AROUND PWB

In case of any abnormality of refrigerator, check by the following procedure;
1. Disconnect power supply and check the following point.
• Is there any failure portion in inserting connectors?
2. Detach the PWB and check the appearance.
• Is there any burning or abnormal damage?
3. Check the conditions of the fuse and the varistor. (Fuse and varistor are located at the position in the figure.)
• Under the condition of power supply plug connected;
In case of no cooling and no indoor lamp lighting, there might be a possibility of fuse (F1) melt down.
In case of cooling but no indoor lamp lighting, there might be a possibility of fuse (F2) melt down.(Only for SJ-T52R, T56R)
(However, these indications do not conclude the cause of the defect.)
When the fuse F1 is melt down, PWB does not operate at all.
When the fuse F2 is melt down, indoor lamp bulb and defrosting heater are not electrified. (It will be diagnosed as "Defrosting failure" by the
self diagnosis.)
• Melting in the fuse cannot be checked visually (as the safer one than transparent glass tube is used). Be sure to detach the connector "CN1/
CN301" before measuring the resistance between the both ends of the fuse by the tester.
• Next, measure the resistance value between the both leads of the varistor.
1) SJ-PT56R
2) SJ-T52R / T56R
Varistor 1
Fuse 1
Fuse 2
Varistor 1
Fuse 1
Fuse 2
Varistor 2
Varistor 2
6 – 2
SJPT56RHS