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Topic: SOLVED !! internals of the auto lamp module (Read 17836 times) previous topic - next topic

SOLVED !! internals of the auto lamp module

Reply #30 –
I've got a zero coming out of pin four so that means D3 is never going to deliver bias voltage on down stream

SOLVED !! internals of the auto lamp module

Reply #31 –
for some reason im starting to think that q2 is a darlinton of some shape or fashion,,
i shot gunned q1 / q2 with 2n4401 and 2n4403 and no go.. the pnp got kinda hot , not exactly sure why but took it back out.
like i said in the earlier post and i thank you for pointing out pin4 on the chip set,, i agree, thats the key, the only chance in hell i have is that another input pin is low as a result of a component thats more available to me to replace, otherwise, i may be screwed.  hope to hear back from you trinom.

I may just pop up each resistor one leg at a time and verify thier resistivity.  I havent done this yet becaue the way things are laid out, i measured across a few and the readings with the tolerance band fell in specifiations, my thoughts are if a resistor were bad, it would show,, visual inspection does not indicate any excessive heat.

by the way, ive been just plugging my card directly into the vehicle harness connector to obtain voltages. 

it would be nice to know if there is a cross ref for the chip set,, google may end up being my friend.

if any of you guys (thunderchicken, softtouch, turbocoupe50, thefoeyouknow, seek and trinom) are reading this,,

what exactly are these transistors with the following markings

q1  =  48-2
q2  =  48 .10

never seen these marks before, not sure what to make of them,, googled the hell out of these and got close on the 48-2 , one site said this 48 -2 was a pnp which surprised me.

SOLVED !! internals of the auto lamp module

Reply #32 –
I guess Q1 and Q2 don't have true names, but only a "nick names". It's quite usual to ask manufacturer for a serie of some device with nick name (if you want milion pieces, it's not a problem).

Q2 might be a darlington PNP. TC4001BP is quad input NOR.

I'm going to make a full schematic for this circuit. I think it might be complete tonight. I have PSPice simulation software, so we will be able to benchtest it on a computer screen.

SOLVED !! internals of the auto lamp module

Reply #33 –
dont forget to let me know what your pin 4 is putting out, mine is 0,1vdc

by the way, to test the photodiode, just power up the card, put your meter lead on one of the sides of the photodiode, then put your finger over the photo diode.

mine increased in voltage as the light increased.  decreased voltage as light decreased.

SOLVED !! internals of the auto lamp module

Reply #34 –
Quote from: jcassity;406642
dont forget to let me know what your pin 4 is putting out, mine is 0,1vdc
Pin 4 is connected directly to cathode of D3
Quote from: Trinom;406606
D3C: when it's on, it has 5,2V, when it's off, it has 0V.


Quote from: jcassity;406642
by the way, to test the photodiode, just power up the card, put your meter lead on one of the sides of the photodiode, then put your finger over the photo diode.
It isn't a photodiode, but the photoresistor. I measured the resistivity and it has 22R in direct light and goes over 1M in the dark. I can measure the voltage as well.

SOLVED !! internals of the auto lamp module

Reply #35 –
humm,,
speaking to the chip set,, it appears the chip is a quad nor gate which explains pin 4 being an output.

pins 2 and 3 need to be low to get a high out on pin4

MM5601BN
Logic Circuit, Quad 2-Input NOR, CMOS, 14 Pin, Plastic, DIP

do you agree and now does it seem like its a more common part?

this is starting to seem more manageable~!

SOLVED !! internals of the auto lamp module

Reply #36 –
Do you have MM5601BN? I have TC4001BP.

Here are the exact values of the devices. You can measure them in the circuit, except R5 and R9 (they show 165k) and R12 which climbs to the sky.


Here is the pinout of the TC4001BP. Vss is ground.

SOLVED !! internals of the auto lamp module

Reply #37 –
i have the MM5601BN pn,, i was assuming the pin out for power input would be a single pin.

gonna look now at a data sheet on it to see if the nor gates are arranged the same.
 

SOLVED !! internals of the auto lamp module

Reply #39 –
well, with this said,, and aparently i "DO" have output power off pin 4,,

i find 5.1v on one side of D3 but like .7 on the anode side.  i am swapping in another diode in a few moments.

SOLVED !! internals of the auto lamp module

Reply #41 –
D3C:...5,1......0,5
D3A:..1,25.....0,5
^^your above readings

my readings are D3C=5.1vdc, D3A=.7vdc

mine would mabye match yours if my D3A were not so low. 

what say you?

SOLVED !! internals of the auto lamp module

Reply #43 –
Here are the simulations for the end stage. Green arrows show voltage, which you can measure on the cathode of D3. Upper part shows OFF state, the lower shows ON state.

SOLVED !! internals of the auto lamp module

Reply #44 –
this will be very helpful to explain my readings when i keep testing.
i should have been done by now,,, LOL.

here are my chipset readings.
it appears my channel 4 is not working right.

i added red lines to show the board bonding jumpers.

why is this called a two source quad nor?  is there suppose to be a power supply on vss to power channels 1 and 2, and power source on vdd to power channels 3 and 4?