Come get sum! Information!

[h_r_f]

Hello NokiaFREE forum, I have the following information to share:

Board Layouts
Schematics
Test Points
Parts Lists (With info voltage, current ratings etc)
Trouble Shooting trees/diagrams
virgin eeproms
repair hints
pinouts (of every connector, chip, and trany)
Test signals
PPM pack info

This stuff really is in depth!
Please don't ask me to point you in the right direction,
Please don't ask to upload stuff unless you are sure you'll need it.
Ask small questions and I'll try to get snipets of info.
Ie which resistor controls the current for the LEDs in NHM-7
Answer would be: R305 470R :)

Support for
3210, 3310 old, 3310 new, 3330, 3410, 3510
5210, 5510, 6150, 6210, 6250, 6310, 6310i, 6510
7110, 8210, 8310, 8850, 8890, 8910

If you feel this info was already freely available, Ive brought it together.
Some people don't like looking. ...

[pico]

are you sure?
to me; R305 in 8310 is just making a current from the voltage at LED enable that controls the base of the first PUMT1 transistor. you can see the base of that transistor is in turn tied to the base of the next transistor which is tied back to the first. basically that is NEGATIVE FEEDBACK and the reason your LEDs will fade on/off :)
as for current in the LEDs, well the voltage supply for them is nothing to do with R305, that just supplies current to saturate the transistor, once it is driven to saturation the LED's will be supplied from VBAT (via R307, 15r). i dont know for sure the details of that transistor but its R307 which sets a current for the LEDs :) :)

[slikmik]

Originally posted by pico
are you sure?
to me; R305 in 8310 is just making a current from the voltage at LED enable that controls the base of the first PUMT1 transistor. you can see the base of that transistor is in turn tied to the base of the next transistor which is tied back to the first. basically that is NEGATIVE FEEDBACK and the reason your LEDs will fade on/off :)
as for current in the LEDs, well the voltage supply for them is nothing to do with R305, that just supplies current to saturate the transistor, once it is driven to saturation the LED's will be supplied from VBAT (via R307, 15r). i dont know for sure the details of that transistor but its R307 which sets a current for the LEDs :) :)

wow u seem to know ya stuff ;)

h_r_f you have competition :)

Good of you both to share this useful info :grin:

Mike

[h_r_f]

You are correct, i made that example up too quick!
The pairs of transistors may be matched (ie from same bin)
I did think they were current mirrors at first. But I looked closer and they aren't :(
When the other side of R305 is pulled low the transistors kick into action (hopefully saturating to ignore Hfe). The 10R and 15R resistors limit the current. (as you said).
The circuit does not fade the leds. There are no time constant components (ie capacitors or inductors (too chunky) ) There is no feed back in the circuit. It is either on or off. By control.
The fading is done by software thru a process called Pulse Width Modulation PWM
eg:

-----_----__---___--____-_____

where '-' is on and '_' is off
this happens too quicky for the eye to pick up. The effect is to average the light output. Fading. Nice!

Extract from NHM-7 service:

LCD & Keypad Illumination
In NHM–7 white leds are used for LCD and keypad illumination. For LCD illumination four leds are used and for keypad six leds.
Current through leds is controlled by transistor circuitry. External transistor driver circuitry is used as constant current source in order to prevent any change in battery voltage be seen as changing led brightness. Battery voltage is changing for example during charging depending on a charger, battery type and age.

Thanks for picking up on that one pico!

[pico]

hi, good day to you!
sorry i didnt read the manual, just checked that part of the scheme (i was bored when i read the post :)). i see now that indeed the transistors are tied together so as a pulse on LED enable will drive both transistors to saturation, the second transistor will then supply VBB to the base of the first (or whatever current that is)-as you say to act as a latch :)
sorry for my quick jump to the conclusion of hardware fade led, but if you search the net you can find a very OLD tutorial how to add fade LED to any phone, with transistor and a diode. thats why at first glimpse it seemed like that to me :)
thats from before the days of DCT4/8310 and "patcher" software :)

[h_r_f]

More heeeed sctratching! ...

If you have the ckt diagram. Goto the control circuit. look at the RHS for now.

V301 is a single package (matched pair).

Assume pin 3 is REF
Pin 4 will be 1 junction higher (REF + 0.7)
Pin 5 will be approx = Pin 3 (REF)
Pin 1 will also be 1 junction higher (REF + 0.7, the same amount hopefully as they're matched at birth)
Therefore Pin1 = Pin5 = (Ref + 0.7)

So If (VBatt - V329) (the diode) = 0.7 volts and pin 4 and 1 of V301 are the same it must be that there is a 0.7V drop accross that 15Ohm resistor (R307)

Calculate 0.7V / 15Ohm = 47mA into pin 4. Then thru 4 leds 12mA each regardless of battery voltage.

Constant current regulator. Even if you short an LED there will still be 47mA flowing thru your short.

(Ill get down now );)

[nonu_don]

Originally posted by h_r_f
Hello NokiaFREE forum, I have the following information to share:

Board Layouts
Schematics
Test Points
Parts Lists (With info voltage, current ratings etc)
Trouble Shooting trees/diagrams
virgin eeproms
repair hints
pinouts (of every connector, chip, and trany)
Test signals
PPM pack info

This stuff really is in depth!
Please don't ask me to point you in the right direction,
Please don't ask to upload stuff unless you are sure you'll need it.
Ask small questions and I'll try to get snipets of info.
Ie which resistor controls the current for the LEDs in NHM-7
Answer would be: R305 470R :)

Support for
3210, 3310 old, 3310 new, 3330, 3410, 3510
5210, 5510, 6150, 6210, 6250, 6310, 6310i, 6510
7110, 8210, 8310, 8850, 8890, 8910

If you feel this info was already freely available, Ive brought it together.
Some people don't like looking. ...

plz mail me all the info, if u have it in a zipped format.
[email protected]

Naman
thnx in advance

[pico]

search the net! you can find service manuals all over, have done for years :)
www.google.com

[h_r_f]

plz mail me all the info, if u have it in a zipped format.

Yea sure. its 123MB and I have a 33.6kbps modem. Ill start up loading now... . . . . . . . . . :D


Please don't ask to upload stuff unless you are sure you'll need it.
Ask small questions and I'll try to get snipets of info.

[green gerbil]

Do you have any technical info on how FAID is generated in nokia phones.

[h_r_f]

no SW info, sorry, but the is an answer on this forum, ive seen it.
Use search! :)

[NokiaFX]

Hello,

would you be able to take a look at this topic please??? if you dont mind http://nokiafree.org/forums/showthread.php?s=&threadid=14230 :)

[h_r_f]

Thanks for asking.
Unfortunately I don't have the thruput to warrant repairs of this nature.

Looking at your thread, you seem to have some capable repair guys!