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Hi,
In the silkscreen printing on the back of the board, there is a notch mark. According to the notch mark, Pin 1 is supposed to be near the copyright mark (c). See the attached picture below. Here I arrow marked the notch and pin 1.
Hi philicoe, the connection of the optocoupler is not correct. On the optocoupler there is a dot mark (see also in datasheet), which indicates pin 1. But in your drawing the dot mark indicates pin 3. See the attached picture below.
In the drawing the part number of the darlington array ic is...
I have downloaded the zip file and seen all the pictures. There is no galvanic isolation between triacs and control circuit so it is unsafe to touch any part of the control circuit when power plug is in the socket.
Turn off the machine and take out the power plug from the wall socket and do...
As there is no suitable optocoupler on the board for driving triacs, so perhaps the triacs are controlled by pulse transformers. There may be a series resistor between pulse transformer's output and triac's gate input and that resistor may also get blown with the blown BCR12PM. Actually what...
Re: Difference between BT138 and BCR12PM Triac's
Unlike BCR12PM, BT138 doesn't have insulated tab (screw hole part of the triac). If you just replace BCR12PM by BT138, then MT2 (main terminal 2) of the triac will get electrically connected to heatsink.
Triac BTA12 or BTA16 has insulated tab, so...
Perhaps it is BSS38 (a PNP BJT). Package (TO-92) and pinout (CBE) matched with the posted picture as well.
Datasheet link: http://pdf.datasheetcatalog.com/datasheet/MicroElectronics/mXsrtvs.pdf
Hello DMG1,
BK precision 1651A is a similar power supply unit. If you read its manual, you may understand the Tenma 72-4045. The picture shown below.
Link for manual : **broken link removed**
Link for quick guide ...
Probably you have selected AC coupling in function menu on the oscilloscope. When AC coupling is selected, the oscilloscope uses a capacitor to block DC and pass AC. The positive/negative pulse is appearing due to charging/discharging of that capacitor. Set DC coupling in function menu. See the...
Is there any external power supply (e.g 24VDC) which is supplying current to all the sensors ? See the picture below.
You can see a power supply unit. Old SMPS power supply unit may give high ripples (Due to old electrolytic capacitors) at its output and may cause trouble. If there is a...
State number of pins for each IC. If possible post picture.
Does 136TM2 match with 6N136 by pin numbers ?
What do you guess about the functions of these ICs ?
So you suspect the master controller is sending weak signal.
In the CAN network most of the signal current pass through the bus termination resistors. So if you increase the value of the termination resistors then the signal voltage level will increase and the system may work.
Usually...
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