MJLJ V4 kit assembly guide: Difference between revisions
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*Solder wick. Too much solder and you'll create ugly blobs and solder spikes. use this to clean up your joints by drawing away excess solder. | *Solder wick. Too much solder and you'll create ugly blobs and solder spikes. use this to clean up your joints by drawing away excess solder. | ||
*A magnifying glass, preferably illuminated, is useful for identifying package markings and inspecting solder joints. | *A magnifying glass, preferably illuminated, is useful for identifying package markings and inspecting solder joints. | ||
==Parts Inventory== | |||
<center> | |||
{| style="width:75%" border="1" | |||
|+ Core Parts | |||
|- bgcolor=grey | |||
!Part!!Type!!Value!!Photo | |||
|- | |||
|R1,R7||Resistor||100 ohms||[[Image:1206_chip_resistor.jpg|32px]] | |||
|- | |||
|R2,R8||Resistor||1K||[[Image:1206_chip_resistor.jpg|32px]] | |||
|- | |||
|R5,R6||Resistor||2.2K||[[Image:1206_chip_resistor.jpg|32px]] | |||
|- | |||
|R9||Resistor||680 ohm||[[Image:1206_chip_resistor.jpg|32px]] | |||
|- | |||
|D6,D7||Schottky Diode|| ||[[Image:SOD-123.jpg|32px]] | |||
|- | |||
|C3,C4,C5,C6,C7,C10||Capacitor||0.1uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|C15||Capacitor||0.001uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|C16||Capacitor||0.22uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|C1||Capacitor||33uF 20v electrolytic||[[Image:radial_electrolytic_capacitor.jpg|32px]] | |||
|- | |||
|C2||Capacitor||33uF 35v tantalum||[[Image:D-case_tantalum_tan.jpg|32px]] | |||
|- | |||
|D1,D2,D3||Diode||1A 400v rectifier||[[Image:SMA_case_diode.jpg|32px]] | |||
|- | |||
|D4||Diode||12V Zener||[[Image:SOD-123.jpg|32px]] | |||
|- | |||
|LED1||LED||Right angle LED, green||[[Image:LED_right_angle_green.jpg|32px]] | |||
|- | |||
|U1||Integrated Circuit||MJLJ V4 Processor Freescale MC908QB8||[[Image:MC908QB8.jpg|32px]] | |||
|- | |||
|IC1||Integrated Circuit||ULN2003 Transistor Array||[[Image:ULN2003.jpg|32px]] | |||
|- | |||
|U2||Integrated Circuit||MAX232A Transceiver (or equivalent)||[[Image:MAX232a.jpg|32px]] | |||
|- | |||
|U3||Integrated Circuit||LM2937-5.0 voltage Regulator||[[Image:SOT-223.jpg|32px]] | |||
|- | |||
|QG1||Oscillator||16MHz oscillator||[[Image:oscillator_half_can.jpg|32px]] | |||
|- | |||
|IC1,U1||Sockets||16 Pin DIP Socket||[[Image:PDIP-16_socket.jpg|32px]] | |||
|- | |||
|X1||Connector||RJ-11 jack||[[Image:RJ11_jack.jpg|32px]] | |||
|- | |||
|X2||Connector||Molex Right angle, 16 position||[[Image:molex_minifit_right_angle_pcb.jpg|64px]] | |||
|- | |||
|} | |||
{| style="width:75%" border="1" | |||
|+ TPS Option | |||
|- bgcolor=grey | |||
!Part!!Type!!Value!!Photo | |||
|- | |||
|R3||Resistor||1K||[[Image:1206_chip_resistor.jpg|32px]] | |||
|- | |||
|C11||Capacitor||0.1uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|C12||Capacitor||0.001uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|C13||Capacitor||0.22uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|C14||Capacitor||15uf||[[Image:D-case_tantalum_grey.jpg|32px]] | |||
|- | |||
|D5||Diode||Schottky Diode||[[Image:SOD-123.jpg|32px]] | |||
|- | |||
|L1||Inductor||1uH||[[Image:1210_smt_inductor.jpg|32px]] | |||
|} | |||
{| style="width:75%" border="1" | |||
|+ MAP Sensor Option | |||
|- bgcolor=grey | |||
!Part!!Type!!Value!!Photo | |||
|- | |||
|R4||Resistor||270 ohm||[[Image:1206_chip_resistor.jpg|32px]] | |||
|- | |||
|C8,C9||Capacitor||0.1uF||[[Image:1206_chip_capacitor.jpg|32px]] | |||
|- | |||
|PS1||Sensor||MPX4250ap||[[Image:MPX4250ap.jpg|32px]] | |||
|} | |||
</center> | |||
==Surface Mount Parts== | |||
===Power supply Circuit=== | |||
====Components==== | |||
====Testing Voltages==== | |||
===Main Circuit=== | |||
====Components==== | |||
====Testing Voltages==== | |||
==Through Hole Parts== | |||
===Installing ICs=== | |||
==Inspection== |
Revision as of 04:16, 11 June 2008
Precautions
Surface mount Components
The soldering portion of this kit was NOT designed for beginners! The Megajolt Lite Jr. makes extensive use of surface mount components. Hand-soldering SMT components requires advanced soldering skills and a steady hand. Individual parts are tiny, and are therefore easy to overheat and damage.
If you are not comfortable assembling this kit after reviewing the instructions, we recommend you purchase a ready-made and tested unit from our online store, offered at a reasonable price.
Before you Begin
Familiarize
Read the instructions completely before soldering your first component.
Do not lose parts
- Leave the parts in their bags and protective tape: Remove them just before soldering.
- Tiny flying parts: Be careful when extracting the parts from the tape- they can go flying if the protective tape is removed too quickly. Also, ensure you have a good grip on the part with your tweezers- a missed tweezer grab can send the part flying.
- Work surfaces and floor: Work in a clean and open area, preferably with hard floors: if a part falls off the bench or flies away from a missed tweezer grab, it will be easier to find.
Lighting
Use lots of good lighting- best is to use bright overhead lights combined with an illuminated magnifying glass.
Note part orientation
Some components, such as diodes and capacitors are marked with a band indicating their orientation. The markings on these components can be faint- especially with the diodes. Be sure to positively identify the component orientation before soldering- good lighting will help this tremendously.
Do not overheat
Small parts are easy to damage- use minimal heat required for soldering components. It is essential a recommended low wattage, fine-tipped soldering iron be used for assembly.
Assembling the kit
Tools you will need
Below are the essential tools you'll need for this project:
- A fine-tipped, low wattage soldering iron is necessary for precision work.
- Probably the best tool - a cross-action set of tweezers. This tool is normally closed, allowing you to hold parts with a relaxed grip and reduced tremors.
- Solder wick. Too much solder and you'll create ugly blobs and solder spikes. use this to clean up your joints by drawing away excess solder.
- A magnifying glass, preferably illuminated, is useful for identifying package markings and inspecting solder joints.
Parts Inventory
Part | Type | Value | Photo |
---|---|---|---|
R1,R7 | Resistor | 100 ohms | |
R2,R8 | Resistor | 1K | |
R5,R6 | Resistor | 2.2K | |
R9 | Resistor | 680 ohm | |
D6,D7 | Schottky Diode | ||
C3,C4,C5,C6,C7,C10 | Capacitor | 0.1uF | |
C15 | Capacitor | 0.001uF | |
C16 | Capacitor | 0.22uF | |
C1 | Capacitor | 33uF 20v electrolytic | |
C2 | Capacitor | 33uF 35v tantalum | |
D1,D2,D3 | Diode | 1A 400v rectifier | |
D4 | Diode | 12V Zener | |
LED1 | LED | Right angle LED, green | |
U1 | Integrated Circuit | MJLJ V4 Processor Freescale MC908QB8 | File:MC908QB8.jpg |
IC1 | Integrated Circuit | ULN2003 Transistor Array | File:ULN2003.jpg |
U2 | Integrated Circuit | MAX232A Transceiver (or equivalent) | File:MAX232a.jpg |
U3 | Integrated Circuit | LM2937-5.0 voltage Regulator | |
QG1 | Oscillator | 16MHz oscillator | |
IC1,U1 | Sockets | 16 Pin DIP Socket | File:PDIP-16 socket.jpg |
X1 | Connector | RJ-11 jack | File:RJ11 jack.jpg |
X2 | Connector | Molex Right angle, 16 position | File:Molex minifit right angle pcb.jpg |
Part | Type | Value | Photo |
---|---|---|---|
R3 | Resistor | 1K | |
C11 | Capacitor | 0.1uF | |
C12 | Capacitor | 0.001uF | |
C13 | Capacitor | 0.22uF | |
C14 | Capacitor | 15uf | |
D5 | Diode | Schottky Diode | |
L1 | Inductor | 1uH |
Part | Type | Value | Photo |
---|---|---|---|
R4 | Resistor | 270 ohm | |
C8,C9 | Capacitor | 0.1uF | |
PS1 | Sensor | MPX4250ap | File:MPX4250ap.jpg |