lumen aeternum
Enlightened
- Joined
- Sep 29, 2012
- Messages
- 890
How do I test these items to know which is bad?
Have a very old (15+ years) Husky 3W spotlight that is not working.
Wall Wart puts out 7.5v 300mA
3 x AA NiMh battery pack, 400 mAh 3.6v
Substituting good batteries, it lights up. Don't have a "pack" or I'd just run it & see if it recharges.
Sticking my voltmeter probe in the wall wart output makes the needle deflect just a little, so I suppose its sending vDC.
So is the battery pack dead, or is the circuit board gone bad, or the wall wart?
How do I test ?
Pack reads 2.6 v and ought to be fully charged.
The board has a rats nest of red wires. Dunno where to put probe to check for vDC charging current. Touching D- and V+ does not move the meter, & I scraped the solder in case they coated it.
LED red wire # 1 to Pad alpha marked D+
Pad D+ to
1) a tiny diode, not the "striped side" (so INPUT, right?)
2) R10
R10 to Red wire #2 to "C" terminal of on/off switch
Switch "NO" terminal to red wire #3 to Pad beta
Pad beta has
1) to striped side of a diode
2) red wire #4 going to battery pack, thru hole marked V+
The black wires from the battery pack and the LED are joined together on a pad linking them to 2 resistors "E" & "B" -- which are part of a row of resistors labeled Gnd, E, B, C, C1.
And bunch of other components.
Have a very old (15+ years) Husky 3W spotlight that is not working.
Wall Wart puts out 7.5v 300mA
3 x AA NiMh battery pack, 400 mAh 3.6v
Substituting good batteries, it lights up. Don't have a "pack" or I'd just run it & see if it recharges.
Sticking my voltmeter probe in the wall wart output makes the needle deflect just a little, so I suppose its sending vDC.
So is the battery pack dead, or is the circuit board gone bad, or the wall wart?
How do I test ?
Pack reads 2.6 v and ought to be fully charged.
The board has a rats nest of red wires. Dunno where to put probe to check for vDC charging current. Touching D- and V+ does not move the meter, & I scraped the solder in case they coated it.
LED red wire # 1 to Pad alpha marked D+
Pad D+ to
1) a tiny diode, not the "striped side" (so INPUT, right?)
2) R10
R10 to Red wire #2 to "C" terminal of on/off switch
Switch "NO" terminal to red wire #3 to Pad beta
Pad beta has
1) to striped side of a diode
2) red wire #4 going to battery pack, thru hole marked V+
The black wires from the battery pack and the LED are joined together on a pad linking them to 2 resistors "E" & "B" -- which are part of a row of resistors labeled Gnd, E, B, C, C1.
And bunch of other components.