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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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philips CD player won't open drawer
Hi,
I have a philips AK601 CD player which will not open its drawer. Before this the drawer would close immediately after opening, don't know if this is part of the problem. I found out that the motor which opens the door gets +5 volts initially to close the door. After that it keeps getting +5 volts. When I push the open/close button on the frontpanel the voltage drops to about +2 volts. I think it should be a negative voltage to let the motor run the other way to open the drawer. What could be wrong? Eelco. |
#2
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philips CD player won't open drawer
I have a philips AK601 CD player which will not open its drawer.
Before this the drawer would close immediately after opening, don't know if this is part of the problem. Did you check the belt which drives the mechanism? Also check the condition of the limit switches which tell the CD player's syscon whenever the drawer is open or closed. - Reinhart |
#3
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philips CD player won't open drawer
I have a philips AK601 CD player which will not open its drawer.
Before this the drawer would close immediately after opening, don't know if this is part of the problem. Did you check the belt which drives the mechanism? Also check the condition of the limit switches which tell the CD player's syscon whenever the drawer is open or closed. - Reinhart |
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philips CD player won't open drawer
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philips CD player won't open drawer
Are you sure the limit switch is good or that it has an uninterrupted
connection to the player electronics? Did you try measuring continuity of both sides of the switch to determine it's condition? The continuity for each side of the switch when closed must read infinity with no resistance. Also, are you sure there's only one limit switch? Another thing you could do is to trace the motor wiring and the open/close control to specific traces on the player circuits. This might help you to find parts that could be suspect on the circuit path that the parts are connected to. Also I checked the voltage on another Philips (different model) CD player. It gets -5V immediately after pressing the OPEN switch on the front. This causes the motor to run in the other direction to open the drawer. If this CD player uses the same chassis and possibly even similar electronics despite being a different model, it is still possible that the functional player might provide clues as to what is going on with the broken player. Although schematics would still be most helpful, you can use parts from the good player to compare the values of suspected parts on the bad player. - Reinhart |
#7
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philips CD player won't open drawer
I have seen one Philips 5-disc model which gets 1 or 2 bad drive
transistors, mounted on the front panel pc board. Don't remember the model number. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. EvT wrote in message ... On 14 Apr 2004 03:39:41 GMT, (LASERandDVDfan) wrote: I have a philips AK601 CD player which will not open its drawer. Before this the drawer would close immediately after opening, don't know if this is part of the problem. Did you check the belt which drives the mechanism? Also check the condition of the limit switches which tell the CD player's syscon whenever the drawer is open or closed. - Reinhart belt is ok (can keep motor still even with +5V over it) Switch is ok too (one switch for open and closed detection) It's the second part of my posting that is interesting... I found out that the motor which opens the door gets +5 volts initially to close the door. After that it keeps getting +5 volts. When I push the open/close button on the frontpanel the voltage drops to about +2 volts. I think it should be a negative voltage to let the motor run the other way to open the drawer. What could be wrong? I found that the voltage drop is only for a second or so. Since I'm using an analogue multi-meter for voltage testing, it is just not fast enough to show the complete voltage drop. during that second I can see the motor trying to run in the other direction (the direction to open the drawer, or perhaps only loosen tension on the belt after the +5V drops to a lower voltage, which causes the axle of the motor to move a little) When I manually push the drawer (partly) open immediately after the voltagedrop, it seems the voltage is between 0 and +1 volts for about 4 seconds. After that the voltage becomes +5V again, which causes the drawer to close. When it is closed, the voltage stays +5V. (should be 0 I think?) Also I checked the voltage on another Philips (different model) CD player. It gets -5V immediately after pressing the OPEN switch on the front. This causes the motor to run in the other direction to open the drawer. The defective one just doesn't get the negative voltage. Any ideas? Eelco. |
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philips CD player won't open drawer
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