Beyond Repair Due To Unknown Part Number In IC
I received this epilator machine from the same customer that I repaired the Panasonic telephone. The model is JDL -6062 12 VOLTS DC 500MA (MADE OF P.R.C).
This machine consists of two parts one adapter that producing 12 v and epilator machine itself. First I tried to turn on the Machine by plugging the adapter to wall outlet but machine did not turn on.
Then I disconnect the adapter from Machine and with help of multi meter I tried to read 12 v DC from the outlet connector but this time multimeter read 0.
Then I decided to open the adapter. No screw for opening! This means by power of hammer and knife or any other methods adapter must be opened. I preferred this time to open it by help of gasoline and Q-tip. First I massage the body of the adapter just between the edges of top and bottom of the case with a Q-tip that was wet with gasoline and I leave it for few minutes then just with small pressure with tip of a flat screw driver I opened two part of the case.
Inside was the pcb and most of the main components of smps were present on the board like big cap, transformer, transistor, diodes, opto IC and so on. With the multimeter I tested one by one, all of the components were found to be good and all of the values were in the tolerances except the opto isolator IC EL817
This is a 4 pin component, pin 1 and 2 are the diode side of opto and pin 3,4 are the photo transistor side of opto by testing the pin 1 and 2 I found out that this side of opto is opened (refer to: THE BOOK OF MR JESTINE YONG TESTING ELECTRONICS COMPONENT) by replacing of opto and resoldering of some bad joints the adapter returned to life. I replaced the DC wire and bad connector and the job was completed.
Now I had this hope that with the epilator receiving the voltage from adapter the machine will start working but it did not! Then I decided to open the 4 screws in the machine
The machine itself consists of a pcb and on the pcb two ICs, 4 big smd transistor 2 smaller one few resistors one motor 1 rotating switch two metallic antenna. In the way up to the circuit from DC connector one smd ic regulator was installed 78L05- sot89. This is a 5 volts regulator a tripod IC ,the input of this IC was from pin 3 and output from pin 1. IC was receiving voltage from adapter but no output!
I replaced bad regulator with a good one now regulator supplying 5 volts for 8 pin smd IC but the machine did not turn on again! What is this 8 pin IC? Snce the manufacturer of this Machine scraped the code of this IC and to verify what kind of IC it is installed is difficult and made this machine irreparable. The reasons that the manufacturer has done this is as follow:
1- Stop others to copy this invention and keep this patent for inventor forever pending.
2- Keep the secrecy of invention
3- Encourage the users to buy a new machine and not to repair it just to get more sales.
I tested all other components and I found all of them good except this unknown IC.
Note 1. Actually the motor of this machine is not rotating always in one direction scraped IC by sending the signals to transistors and by amplifying the signals by three stages voltage to motor and motor by rotating to right and left pull the thread to right and left and engage with unwanted hairs and doing the job of epilation.
Note 2: In stage 1 transistors are smaller they are pre-amplifiers but in second and third stage they are bigger and more powerful transistor D882 NPN and D772 PNP they make a push pull alike circuit in this machine. the scraped ic determine the negativity or positivity of the signals to push pull circuit and eventually the motor by receiving this voltage rotate to left or right.
Note 3: unknown 8 pin IC was receiving the voltage but there was no output from other pins most probably the problem of this machine is from this 8 pin IC, that is why this machine is IRREPARABLE!
This article was prepared for you by Mr Beh from Iran
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