Salam,
Lesson 4: Contact Issue
What is "Contact Issue"?
//====================to be continue after heavy rain======================
Don't Be Sad
1 day ago
Saturday, October 31, 2009
Wednesday, October 28, 2009
Monday, October 12, 2009
Saturday, September 26, 2009
Troubleshoot Electronic Circuit (Lesson 3) - - - Golden Rule
Salam,
Lesson 3: Golden Rule (comparison)
What is the purpose doing Comparison?
To determine either the electronic device performance is like the others or not.
Why?
To find out "weird" data/reading/measurement/graph of electronic devices by compare with "good" electronic devices. By doing this, the suspected faulty electronic connection can be predicted.
How?
at PCBA: measure resistance and voltage through suspected faulty connection and make comparison.
at OVERALL DEVICE: compare performances between them.
Lesson 3: Golden Rule (comparison)
What is the purpose doing Comparison?
To determine either the electronic device performance is like the others or not.
Why?
To find out "weird" data/reading/measurement/graph of electronic devices by compare with "good" electronic devices. By doing this, the suspected faulty electronic connection can be predicted.
How?
at PCBA: measure resistance and voltage through suspected faulty connection and make comparison.
at OVERALL DEVICE: compare performances between them.
Saturday, September 19, 2009
Troubleshoot Electronic Circuit (Lesson 2) - - - Calibration
Salam,
Lesson 2: Calibration
What is the purpose doing Calibration?
To ensure you measurements accurate and persistence.
Why?
It because certain device are sensitive in different Current, Voltage, Power (dbm, watt) and Resistance. Over supply might harm device and insufficient supply might affected the performance.
How to do Calibration?
By making comparison with "good unit" measurements or in industries called as Golden Unit or sometimes named as DV. This Golden Unit or DV had given it value as reference, hence by measure it you can get your instruments (multimeter/hand held/LCR/etc) error value.
When should perform calibration?
For optic-electronic industries, calibration should be done every time make change on connection. Besides that enough to do annually or periodic.
How to use error value?
Deduct or add error value after make measurement, so that you can get accurate measurements.
My senior engineer told me: "Your second lesson is calibration, first VMI. Now you know important of calibration". He told me because my calibration effect others experiment. Hope you get what I meant and learn from my mistake?
Lesson 2: Calibration
What is the purpose doing Calibration?
To ensure you measurements accurate and persistence.
Why?
It because certain device are sensitive in different Current, Voltage, Power (dbm, watt) and Resistance. Over supply might harm device and insufficient supply might affected the performance.
How to do Calibration?
By making comparison with "good unit" measurements or in industries called as Golden Unit or sometimes named as DV. This Golden Unit or DV had given it value as reference, hence by measure it you can get your instruments (multimeter/hand held/LCR/etc) error value.
When should perform calibration?
For optic-electronic industries, calibration should be done every time make change on connection. Besides that enough to do annually or periodic.
How to use error value?
Deduct or add error value after make measurement, so that you can get accurate measurements.
My senior engineer told me: "Your second lesson is calibration, first VMI. Now you know important of calibration". He told me because my calibration effect others experiment. Hope you get what I meant and learn from my mistake?
Tuesday, September 15, 2009
Troubleshoot Electronic Circuit (Lesson 1) - - - VMI
Salam,
Lesson 1: VMI (Visual Mechanical Inspection)
What is the purpose doing VMI?
To find out physical defect on electronic circuit.
Why?
Most of the functional failure can cause from hardware failure and software failure. The hardware failure more easier to identified if compare with software failure.
How to do VMI?
By doing physical inspection using microscope (30X zoom) to identified the physical defect such as Expose Copper, Crack, Solder Bridging, Solder Join, Melt, Explode, Burn, Shorted and others.
Why need microscope?
It much easier to inspect defect on SMD's Components(Surface Mounted Device). Naked eye difficult to recognize failure defect on extra small components.
all this remind me to this proverb: "Jika tiada angin masakan pokok bergoyang". Hope you get what i meant?
Lesson 1: VMI (Visual Mechanical Inspection)
What is the purpose doing VMI?
To find out physical defect on electronic circuit.
Why?
Most of the functional failure can cause from hardware failure and software failure. The hardware failure more easier to identified if compare with software failure.
How to do VMI?
By doing physical inspection using microscope (30X zoom) to identified the physical defect such as Expose Copper, Crack, Solder Bridging, Solder Join, Melt, Explode, Burn, Shorted and others.
Why need microscope?
It much easier to inspect defect on SMD's Components(Surface Mounted Device). Naked eye difficult to recognize failure defect on extra small components.
all this remind me to this proverb: "Jika tiada angin masakan pokok bergoyang". Hope you get what i meant?
Friday, September 11, 2009
How you read schematic diagram without knowing the function of the circuit? (electronic)
Salam,
Many things need to catch up in past two weeks. Eight cases handled from various customer basically more on electronics's components (SMD) and Printed Circuit Board Assembly (PCBA). Alhamdulillah my senior assist me a lots. He told "we are like detective", because every time found somethings need to take evidence (picture/diagnostic/functional result). Jom! let learns together..
How you read schematic diagram without knowing the function of the circuit? (electronic)
I had search on google and found something goods from expert who have working experience more than 20 years on electronics.. :) Below is the answer:-
"I've been an electronics tech for almost 20 years now. Learning to read schematics takes time and is a crucial part of troubleshooting. There's people who have been in the field for years and are still not proficient at reading prints. Of course being able to read the prints does you no good if you don't understand electricity and electronics. But the first step to reading prints is learning the symbols.
Here's a VERY good free intro to schematic symbols. It even has a little matching excersice at the end. Start here:
http://www.wisc-online.com <--register free
Once you've completed the excersice, you can go to this link where they have a pretty good reference chart of component symbols and their function.
http://www.kpsec.freeuk.com/symbol.htm
These will get you started.
There are many different kinds of diagrams (1-line, 3-line, Elevation, P&ID, Instrument Loop, Logic Flow, Schematic, Mechanical Integrity, Electrical, Conduit plan, Wire Schedule, etc, etc). Learning how to read all of them proficiently is quite a task and can't be explained here."
Many things need to catch up in past two weeks. Eight cases handled from various customer basically more on electronics's components (SMD) and Printed Circuit Board Assembly (PCBA). Alhamdulillah my senior assist me a lots. He told "we are like detective", because every time found somethings need to take evidence (picture/diagnostic/functional result). Jom! let learns together..
How you read schematic diagram without knowing the function of the circuit? (electronic)
I had search on google and found something goods from expert who have working experience more than 20 years on electronics.. :) Below is the answer:-
"I've been an electronics tech for almost 20 years now. Learning to read schematics takes time and is a crucial part of troubleshooting. There's people who have been in the field for years and are still not proficient at reading prints. Of course being able to read the prints does you no good if you don't understand electricity and electronics. But the first step to reading prints is learning the symbols.
Here's a VERY good free intro to schematic symbols. It even has a little matching excersice at the end. Start here:
http://www.wisc-online.com <--register free
Once you've completed the excersice, you can go to this link where they have a pretty good reference chart of component symbols and their function.
http://www.kpsec.freeuk.com/symbol.htm
These will get you started.
There are many different kinds of diagrams (1-line, 3-line, Elevation, P&ID, Instrument Loop, Logic Flow, Schematic, Mechanical Integrity, Electrical, Conduit plan, Wire Schedule, etc, etc). Learning how to read all of them proficiently is quite a task and can't be explained here."
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