Orion MBR not charging

[Perry Babin]

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)?

[manina]

Actually it's 3,5V when the headlamp is connected

[Perry Babin]

Confirm that the small supply in the regulator is not producing voltage. IC2 shouldn't have any significant voltage on any pin.

[manina]

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

[Perry Babin]

Do all of the large resistors read 0.000v DC now?

[manina]

Originally Posted by Perry Babin

Do all of the large resistors read 0.000v DC now?

Yes, 0,00V

[manina]

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?

[Perry Babin]

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.

[manina]

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

[Perry Babin]

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: