Testing the PPWiN Programmer

It is reccmomended that you go through the following proceedure after you have made the programmer and before you program it.

Check List:

• Start by testing your programmer with the printer connector and PIC removed. Apply power to the programmer, ideally using a current limited power supply (100mA) or with a 100R resistor in series with VIN. The resistor acts a bit like a fuse is it will quickly burn out if there is a serious problem but should provide enough current to power the programmer if it's working properly.
• Both the VCC and VPP LED's should be on. Using a Voltmeter measure the Voltage between Pin5 (0V) and Pin14 (5V) on the 18pin PIC socket. This comes through a ZTX500 transistor from the 78L05 regulator so if it's not 5V check the Voltages on the regulators input and output. If the output Voltage is too high it could be the wrong way around or the wrong device. If the output Voltage is to low you could have a short on the PCB or one of the electrolytics may be upside down. If the voltage out of the regulator is about right but the Voltage on Pin14 is to low then check the transistor is the correct device and the right way around. If this is right then see if Pin8 of the 7406 is nearly 0V as this drives the transistor on.
• Next measure the Voltage between Pin5 (0V) and Pin4 (13.2V) of the 18pin PIC socket. This should be between 13 to 13.5V, similar possible problems to 1) but also the output Voltage could be too high if the 1N4148 diodes are the wrong way around.
• If both 5V and 13V supplies are now correct both LED's should be ON if not check they are the correct way around and the drive resistors are the correct value.
• Remove the 100R resistor and connect to the printer port, run the ICPROG software following the settings given in the software section. Use the hardware check to make sure you can turn VCC/VDD (MCLRE) ON/OFF through software. Also make sure that when Data Out is ticked the Data In input becomes ticked.

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