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Old 11th December 2011, 04:57 PM   #41
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Do you still read approximately 0v between leg 1 and leg 3 of each of these transistors (when you read 0.01-0.03v across the large resistors)?
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Old 14th December 2011, 03:07 PM   #42
manina is offline manina  Germany
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Actually it's 3,5V when the headlamp is connected
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Old 14th December 2011, 10:58 PM   #43
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Confirm that the small supply in the regulator is not producing voltage. IC2 shouldn't have any significant voltage on any pin.
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Old 15th December 2011, 09:20 AM   #44
manina is offline manina  Germany
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I just realized I did something really stupid.

To turn off the MBR I unplugged the connector I placed on the "power" however there was also the ground on the same connector.

Basically, the headlamp was turning on as the MBR was grounding through the lamp.

Properly grounded, the headlamp does not turn on.

In any case, there is voltage on some pins of IC2
Pin2, 3 and 15 are at 2,1V and pin16 at 9,15

No significant voltage on any of the IC1 pins and on the Out I can measure 12,3V with an input of 13,6
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Old 15th December 2011, 01:10 PM   #45
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Do all of the large resistors read 0.000v DC now?
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Old 16th December 2011, 01:09 PM   #46
manina is offline manina  Germany
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Quote:
Originally Posted by Perry Babin View Post
Do all of the large resistors read 0.000v DC now?
Yes, 0,00V
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Old 20th November 2012, 03:51 PM   #47
manina is offline manina  Germany
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This device is again giving me problems - the secondary battery is not charged

With the lamp I used last time, I measured the output voltage and it's around 8V with the lamp on.

Voltage at Q8 (that was failing last time) is, @ pin1, 29,6V when turned on without the lamp and drop to 16,4V with the lamp connected. If I disconnect the lamp, the voltage goes to 18,4V and not to 29,6V and the green led (charging) stay on.

This is really strange.

By the way, I already replaced Q8 with a brand new one, just o be on the safe side.

Any suggestion?
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Old 20th November 2012, 07:27 PM   #48
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For transistors Q5, 6, 7 and 8, post the DC voltage on their bases and collectors. Place the black probe on the emitter of each transistor while measuring the voltage on their other terminals.
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Old 21st November 2012, 02:46 PM   #49
manina is offline manina  Germany
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Black probe on leg 1 (E) and measured pin 2 (B) and 3 (C):
Q5: -(minus)0,6 on B and -7,8 on C
Q6: 0,8 and 0
Q7: 0,7 and 0
Q8: -0,3 and 5,64

with the headlamp connected and an output of 8,6volts
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Old 21st November 2012, 03:09 PM   #50
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Post the voltages on Q8 again as well as the voltage on all pins of the 494.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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