On Tuesday, February 10, 2015 01:29:22 PM Dave Cole wrote:
> What would be burning up those diodes?
>
> Incorrect wiring to the drive?
> Leaking electrolytics?
>
> In my limited experience, diodes usually don't fail for no reason.
>
> Dave
Bad capacitors are usually the culprit. A capacitor wit
On 02/10/2015 11:15 PM, John Kasunich wrote:
> The ON Semi website says that ON Semiconductor was spun off from
> Motorola in 1999. So Jon is right, those parts would not have been
> labeled as "ON Semi" in 1997.
>
>
Of course, the board was LABELED 1997, but might have been
populated sometime
la
The ON Semi website says that ON Semiconductor was spun off from
Motorola in 1999. So Jon is right, those parts would not have been
labeled as "ON Semi" in 1997.
On Tue, Feb 10, 2015, at 11:37 PM, Jon Elson wrote:
> On 02/10/2015 12:29 PM, andy pugh wrote:
> > On 10 February 2015 at 17:53, Jon
On 02/10/2015 12:29 PM, andy pugh wrote:
> On 10 February 2015 at 17:53, Jon Elson wrote:
>> The markings appear to be CU02 then on next line MON.
>> The CU02M shows up as a CMR1U-02M, available from Digi-Key.
>> 200V 1A, 35ns reverse recovery time.
> I guess you have more experience than me
On 02/10/2015 12:32 PM, Dave Cole wrote:
> Mouser has them for 42 cents each.I forget which one Digikey or
> Mouser, but one will ship first class mail which makes buying small lots
> really cheap.
>
> Dave
I have bought quite a lot of parts from Mouser, and they have
economy shipping as
On 02/10/2015 11:07 AM, Gene Heskett wrote:
> On Tuesday, February 10, 2015 12:53:03 PM Jon Elson wrote:
... snip
>> The markings appear to be CU02 then on next line MON.
>> The CU02M shows up as a CMR1U-02M, available from Digi-Key.
>> 200V 1A, 35ns reverse recovery time.
>>
>>
>> Jon
>
> Onl
On Tuesday, February 10, 2015 12:53:03 PM Jon Elson wrote:
> On 02/09/2015 10:43 PM, Dean Posekany wrote:
> > After the comments/recommendations to think about attempting a repair
> > to the Parker drives, I popped several open and took a good look
> > around. On the top surface I could find no obv
What would be burning up those diodes?
Incorrect wiring to the drive?
Leaking electrolytics?
In my limited experience, diodes usually don't fail for no reason.
Dave
On 2/10/2015 12:53 PM, Jon Elson wrote:
> On 02/09/2015 10:43 PM, Dean Posekany wrote:
>> After the comments/recommendations to t
On 10 February 2015 at 17:53, Jon Elson wrote:
> The markings appear to be CU02 then on next line MON.
> The CU02M shows up as a CMR1U-02M, available from Digi-Key.
> 200V 1A, 35ns reverse recovery time.
I guess you have more experience than me at this, and a plain diode
seems more likely th
On 2/10/2015 1:05 PM, Jon Elson wrote:
> On 02/10/2015 09:39 AM, andy pugh wrote:
>> On 10 February 2015 at 15:15, John Kasunich wrote:
>>> Not neccessarily. You are testing them in-circuit, and the 1.47V might be
>>> a completely different path through some other part(s) on the circuit board.
>>
OK guys, I popped one end up on one of the "bad" diodes and read OL on
the reverse bias, not the 1.47V that I saw when it was in circuit. Good
call.
So, as Clint Eastwood once said "A man's just got to know his
limitations." And I know enough about electronics to be really, really
dangerous.
On 02/10/2015 09:39 AM, andy pugh wrote:
> On 10 February 2015 at 15:15, John Kasunich wrote:
>> Not neccessarily. You are testing them in-circuit, and the 1.47V might be
>> a completely different path through some other part(s) on the circuit board.
> If they are 5v zeners like I thik they are t
On 02/10/2015 09:01 AM, Dean Posekany wrote:
> Is there any way to check the FET's. These are going to be
> a PIA to do a wholesale replacement due to the way they're
> mounted to the heatsink. It looks easy, but with the
> spring clamps and the age on the heatsink compound,
> they're locked in
On 02/09/2015 10:43 PM, Dean Posekany wrote:
> After the comments/recommendations to think about attempting a repair to
> the Parker drives, I popped several open and took a good look around. On
> the top surface I could find no obvious problems. Not popped caps, no
> burn marks, nothing. On the bo
On Tuesday, February 10, 2015 10:15:22 AM John Kasunich wrote:
> On Tue, Feb 10, 2015, at 10:01 AM, Dean Posekany wrote:
> > On 2/10/2015 3:00 AM, Gene Heskett wrote:
> >
> > snip
> >
> > > The diode checker of the modern meter reads the voltage drop, fwd
> > > direction on this type of diode s/b
On Tuesday, February 10, 2015 10:01:13 AM Dean Posekany wrote:
> On 2/10/2015 3:00 AM, Gene Heskett wrote:
>
> snip
>
> > The diode checker of the modern meter reads the voltage drop, fwd
> > direction on this type of diode s/b under .15 volts, while the
> > reverse of the probes should show a mu
On 10 February 2015 at 15:15, John Kasunich wrote:
> Not neccessarily. You are testing them in-circuit, and the 1.47V might be
> a completely different path through some other part(s) on the circuit board.
If they are 5v zeners like I thik they are then a multimeter probably
won't be able to tes
On Tuesday, February 10, 2015 10:01:13 AM Dean Posekany wrote:
> On 2/10/2015 3:00 AM, Gene Heskett wrote:
>
> snip
>
> > The diode checker of the modern meter reads the voltage drop, fwd
> > direction on this type of diode s/b under .15 volts, while the
> > reverse of the probes should show a mu
On Tue, Feb 10, 2015, at 10:01 AM, Dean Posekany wrote:
>
> On 2/10/2015 3:00 AM, Gene Heskett wrote:
>
> snip
> > The diode checker of the modern meter reads the voltage drop, fwd
> > direction on this type of diode s/b under .15 volts, while the reverse
> > of the probes should show a much
On 2/10/2015 3:00 AM, Gene Heskett wrote:
snip
> The diode checker of the modern meter reads the voltage drop, fwd
> direction on this type of diode s/b under .15 volts, while the reverse
> of the probes should show a much higher voltage, maybe even off-scale
> for reverse. Right where they si
On 10 February 2015 at 04:43, Dean Posekany wrote:
> https://www.dropbox.com/sc/fzugl3ebp7hlbbj/AABZSMn6f70FORZS3FpRhRc-a
Possibly:
http://docs-europe.electrocomponents.com/webdocs/0dad/0900766b80dad746.pdf
ON = On Semiconductor, date code 2002, part code CU ?
(I used http://www.marsport.org.
On Tuesday, February 10, 2015 01:49:53 AM Dave Cole wrote:
> Yep, I think they are diodes...
>
> And your diodes don't look very good. It looks like they may have
> overheated.
>
> There are several of those diodes on the other side of the board.
> Under the electrolytics and between some of th
Yep, I think they are diodes...
And your diodes don't look very good. It looks like they may have
overheated.
There are several of those diodes on the other side of the board.
Under the electrolytics and between some of the larger chips near the
power fets.
They all have the same designati
After the comments/recommendations to think about attempting a repair to
the Parker drives, I popped several open and took a good look around. On
the top surface I could find no obvious problems. Not popped caps, no
burn marks, nothing. On the bottom, I found what looks to be a problem
on two o
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