How to Diagnose and Repair Soldering Iron Not Heating Up | Temperature | SAIKE 952D

Today, I want to show you how to diagnose and repair a soldering iron that not heating up. For your information, I use the original heating element A1321 from Hakko and rework station SAIKE 932D.

Step 1: Diagnosis soldering iron

1. My handle soldering iron malfunctioned. I need to bend the cable cord to start increasing the temperature.
   
   
   
   
   
2. If the cable cord is straightened, the temperature will not increase.
   
3. I will show you how to repair squeaking noise problems in this post.

Step 2: Removal/Troubleshoot of a soldering iron handle

1. Remove 5 pin soldering iron connector from the work station.
   
   
   
   
   
2. Remove nut → tip enclosure → tip → nipple → handle → cable cord sleeve.

   
   

   
   
   
   
   
   
   
   
   

   
   
3. The soldering job is poorly done, and the wires are folded from the surface view.
   
   
   

   
   
4. Measure the resistance of the A1321 sensor and heating element. If the value is outside the acceptable range, replace it. If the resistance value is normal, the cable cord may be broken.
   
   
   
   
   
5. After troubleshooting, the heat element resistance not detectable (OL) mean

   open load or open circuit.
   
   
6. So, I decided to desolder the wire cord connected to the terminal board.
   
   
   
   
   
7. Test continuity and resistance of each wire. Every pin and wire should have continuity and resistance within the range.
   
   

   

   
   
8. However, pin 2 has no continuity and resistance (OL). When I bend the cable cord, pin 2 has resistance and continuity. If I straightened the cable cord, pin 2 had no resistance and continuity. 
   
   
9. The root of the cause is a blue wire cord broken at the bend place. Cut the broken cable cord around 5 - 8 cm. 
   
   

   

   
   
10. Remove the broken cable cord from the terminal board.
    
    

    

    
    
11. Remove wire sleeve according to the broken wire length. 
    
    

    

    
    
12. Test continuity and resistance of each wire. All wires are in good condition within the resistance tolerance and have continuity. 
    
    

    

    
    
13. Prepare and clean the terminal board pinhole. Use isopropyl alcohol to clean the terminal board from resin and dust accumulated. 
    
    

    
    
    

    
    
14. Place the wire in its place and solder. 
    
    

    
    
    

Step 2: Installation

1. Bend metal cable cord holder.
   
   

   

   
   
2. Install the handle components in reverse order of removal. 
   
   

   

   
   
3. Measure the resistance values at the sensor and heating element of the terminal board. The sensor and heating element resistance values are within the range. 
   
   

   
   
   
4. Install the cable cord sleeve. 
   
   

   

   
   
5. Connect the 5 pin connector to work station and test the soldering iron. 
   
   

   

   
   
6. Turn ON soldering iron and test increasing temperature. 
   
   

   

   
   
7. The temperature rise in normal condition. 
   
   

   

   
   
8. However, I do not have a thermocouple to measure the tip temperature. Overall it works like a charm. 
   
   

   

   
   

The link tools and components replacement I used in this video are listed below:

Tools/Components/Items (Shopee):

1. Screwdriver Set
2. Plier Set
3. Solder Core Wire (0.6mm)
4. Solder Flux
5. Tweezer ESD
6. Rework Station (SAIKE 952D)
7. Multimeter UT89XD

Tools/Components/Items (Lazada):

1. Screwdriver Set
2. Plier Set
3. Solder Core Wire (0.6mm)
4. Solder Flux
5. Tweezer ESD
6. Rework Station (SAIKE 952D)
7. Multimeter UT89XD

Tools/Components/Items (Aliexpress):

1. Screwdriver Set
2. Plier Set
3. Solder Core Wire (0.6mm)
4. Solder Flux
5. Tweezer ESD
6. Rework Station (SAIKE 952D)
7. Multimeter UT89XD

Video:

That all from me. If you have any suggestions, please write in the comment section. Thank you for your time 👷.