Nokia 9500 not charging problem (Zener Diode 1pmt16at3)
My Nokia 9500 is not charging, and in my research I came to the conclusion that the problem is a charging circuit inside the phone. The part that is not functioning is a Zener diode 1pmt16at3. I was wondering is there a similar diode in some other cheaper or older Nokia phones that I can use for replacement. I've seen it in some models, but they were all pretty expencive. First I wanted to buy that diode, but can't find it anywhere. Replacement is not a problem for me.
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I'm not sure what your question is. A zener diode is a voltage regulator of sorts. The zener voltage is the avalanche voltage...the voltage that the zener diode will maintain when it's connected in series with an impedance, usually a resistor, IF the voltage across the zener diode and the impedance, in series, is greater than the avalanche voltage (zener voltage), and the polarity of the voltage across the zener diode is thus: positive cathode, negative anode (i.e., reverse bias). The excess voltage (the margin) appears across the impedance. Zeners are often used as voltage reference diodes in regulated power supplies. Does this answer your question?
The secondary output voltage comes out from is more than it should be there. That is why, the protection zener diode blows off, as soon as you switch ON the set. First find and repair the power supply regulator, for correct output voltage. Refer its repair book for details. After repair include the zener diode in place. OK.
On the cathode of the zener diode look for a filter cap and check its value the voltage of the zener should be less than the working voltage of the zener. Basicly its likely being used as a shunt regulator as protection and regulation of the voltage. When the zener hits a certain threshold it will breakdown and start conducting to ground until the supply regulates and then it will recover. If the filter cap for that voltage rail was 25V I would guess that the zener would probably be regulating between 12 and 20 volts. I'd pick a 15V Zener its probably +- %10 on the original and any system should be able to take a %10 tolerance as a general design rule.
Yes, Zener diodes can work both on forward and reverse biasing. The primary difference between a zener diode and the ordinary junction diode is it is designed specifically to operate with a reverse bias voltage that is high enough to cause the the device to breakdown and conduct a high reverse current. Hope this answers your question and provides you with some help. If you need further assistance please let me know.
If you do not mind, would you please rate my help. I would very much appreciate it. Thanks
I was not able to find any service or schematic for this model. The colors means that the value is 22.6 volts zener diode with the other blue band indicating where the cathode is.
Could you tell me where or what other components this zener diode is connected to?
The first letter:
A = Ge material semiconductors,
B = Si material semiconductors,
C = GaAs material semiconductors,
R = Compound material.
The second letter:
A = Diode (low power, signal);
B = Diode (variable capacitance));
C = Transistor (low power, audio frequency);
D = Transistor (power, audio frequency);
F = Transistor (low power, high frequency);
L = Transistor (power, high frequency);
R= control and swithching device);
S = Transistor (low power, swithching);
T = thyristors;
U = Transistor (power, switching);
X = Diode (varactor, multiplier);
Y = Diode (rectifier);
Z = Diode (zener).
So the BC547 is a Silicon low power, audio frequency transistor.
Hope that helps!