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#1
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Philips GA212 turntable problem
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??? |
#2
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Philips GA212 turntable problem
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] ----------------------------------------------------------- |
#3
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Philips GA212 turntable problem
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??? |
#4
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Philips GA212 turntable problem
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??? |
#5
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