Philips GA212 turntable problem

[bigdogdude]

I've got a Philips 212 in my restoration stack, which has a problem I have
not run into with them before... I hope someone else has seen this.

When the motor is under a load, such as during startup, the unit wants to
switch to "stop". I can hold my finger across the touch pad surfaces long
enough for it to come up to speed (both 33 and 45), but the slightest drag
on the platter causes it to stop (and the stop pad illuminates). Clearly the
extra current demand is the root of the problem, but I don't recall this
version having a very advanced servo system (IOW placing the arm on an LP
will drag a 212's speed down a bit). Here, it's as though instead of
dragging down a bit - it shuts down.

This example is in minty looking condition - I hate to junk/part it out...
ditto for fixing it vs. selling it as a fixer. Input please???

[Barry Mann]

In >, on 07/09/03
at 04:39 PM, "bigdogdude" > said:

>I've got a Philips 212 in my restoration stack, which has a problem I
>have not run into with them before... I hope someone else has seen
>this.

>When the motor is under a load, such as during startup, the unit wants
>to switch to "stop". I can hold my finger across the touch pad
>surfaces long enough for it to come up to speed (both 33 and 45), but
>the slightest drag on the platter causes it to stop (and the stop pad
>illuminates). Clearly the extra current demand is the root of the
>problem, but I don't recall this version having a very advanced servo
>system (IOW placing the arm on an LP will drag a 212's speed down a
>bit). Here, it's as though instead of dragging down a bit - it shuts
>down.

>This example is in minty looking condition - I hate to junk/part it
>out... ditto for fixing it vs. selling it as a fixer. Input please???

Make sure *ALL* the lamps are working. If not, the unit will behave
badly. Each unit has it's own quirky behavior when a lamp or two is
out, it's hard to predict exactly what will happen.

-----------------------------------------------------------
SPAM:
wordgame:123(abc):<14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15
13> (Barry Mann)
[sorry about the puzzle, SPAMers are ruining my mailbox]
-----------------------------------------------------------

[Tim Schwartz]

Hello,
I agree with Barry Mann about the lights but will add the the correct
current (40 ma?) lamps are critical. Also make sure the capacitance
switches are clean. If crud builds up in the space between the center
dot and the outer ring, the switches may trigger for no reason at
random, and it gets worse with humidity. A dry q-tip or one with a bit
of windex on it seems to work ok for cleaning. I would avoid any
solvents that might attack the plastic, and you don't want any residue.

Regards,
Tim Schwartz
Bristol Electronics

bigdogdude wrote:
>
> I've got a Philips 212 in my restoration stack, which has a problem I have
> not run into with them before... I hope someone else has seen this.
>
> When the motor is under a load, such as during startup, the unit wants to
> switch to "stop". I can hold my finger across the touch pad surfaces long
> enough for it to come up to speed (both 33 and 45), but the slightest drag
> on the platter causes it to stop (and the stop pad illuminates). Clearly the
> extra current demand is the root of the problem, but I don't recall this
> version having a very advanced servo system (IOW placing the arm on an LP
> will drag a 212's speed down a bit). Here, it's as though instead of
> dragging down a bit - it shuts down.
>
> This example is in minty looking condition - I hate to junk/part it out...
> ditto for fixing it vs. selling it as a fixer. Input please???

[bigdogdude]

Thanks guys! Here's where I am at now...

The lamps are fine (and correct factory - 6.3v ,44ma), however I strongly
suspect either the motor is drawing excessive current, or there is an issue
with the power supply. Without the platter in place (but with the belt on,
turning the sub-platter), the speed pad lamp as well as the end of record
optical sensor lamp dim as the motor corrects speed. Slow the motor only
slightly, and they dim a great deal. Also torque is extremely low for this
model.

I appreciate the input - but I think this one is going to go on eBay as a
clean fixer. I have a soft spot for these old 212's, and I am sure someone
else will too.

Alan


"Tim Schwartz" > wrote in message
...
> Hello,
> I agree with Barry Mann about the lights but will add the the correct
> current (40 ma?) lamps are critical. Also make sure the capacitance
> switches are clean. If crud builds up in the space between the center
> dot and the outer ring, the switches may trigger for no reason at
> random, and it gets worse with humidity. A dry q-tip or one with a bit
> of windex on it seems to work ok for cleaning. I would avoid any
> solvents that might attack the plastic, and you don't want any residue.
>
> Regards,
> Tim Schwartz
> Bristol Electronics
>
> bigdogdude wrote:
> >
> > I've got a Philips 212 in my restoration stack, which has a problem I
have
> > not run into with them before... I hope someone else has seen this.
> >
> > When the motor is under a load, such as during startup, the unit wants
to
> > switch to "stop". I can hold my finger across the touch pad surfaces
long
> > enough for it to come up to speed (both 33 and 45), but the slightest
drag
> > on the platter causes it to stop (and the stop pad illuminates). Clearly
the
> > extra current demand is the root of the problem, but I don't recall this
> > version having a very advanced servo system (IOW placing the arm on an
LP
> > will drag a 212's speed down a bit). Here, it's as though instead of
> > dragging down a bit - it shuts down.
> >
> > This example is in minty looking condition - I hate to junk/part it
out...
> > ditto for fixing it vs. selling it as a fixer. Input please???

[vernvan]

I've got a Philips 212 in my restoration stack, which has a problem I have
not run into with them before... I hope someone else has seen this.

When the motor is under a load, such as during startup, the unit wants to
switch to "stop". I can hold my finger across the touch pad surfaces long
enough for it to come up to speed (both 33 and 45), but the slightest drag
on the platter causes it to stop (and the stop pad illuminates). Clearly the
extra current demand is the root of the problem, but I don't recall this
version having a very advanced servo system (IOW placing the arm on an LP
will drag a 212's speed down a bit). Here, it's as though instead of
dragging down a bit - it shuts down.

This example is in minty looking condition - I hate to junk/part it out...
ditto for fixing it vs. selling it as a fixer. Input please???

I know that this answer is a couple years late, but I was searching for an on/off switch for my GA212 and ran across this. I have had this problem a couple times and know the fix. You have a bad transistor. If you lift the platter off, you will see a round silver transister about the size of a nickel. It needs to be replaced and your 212 will work again.

Vern