50v

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1. Home Manicure Kit
The electric home manicure kit is only one of several types that are on the market today. The unit consists of a power-pack assembly in the case which incorporates a transformer to step down the house line current to a safe level and a diode to rectify the ac (change the ac to dc). The 15V dc output of the power pack is fed through the terminal board to the cord set and into the power handle assembly. A small dc motor in the power handle assembly is used to power the numerous manicuring attachments. Troubleshooting Two systems are involved: the motor and the power handle. Motor will not run. Check to see that the switch on the manicure set is placed in the on position. Check the plug on the retractable cord to confirm that it is fully seated on the connector pins, and that the "key" on the plug mates with the slot in the case. If these items check okay localize the trouble as follows: 1.  Connect line cord to 120V ac outlet and pull out the retractable cord plug. 2. With a VOM on the 50V dc range, read the voltage at the connector pins. If the switch, cord, and power supply are okay, the voltage should read approximately 15V. 3.  If very low or no voltage is read, disassemble the case as detailed below. 4.  If proper voltage is read, the trouble is in the power handle, which should be tested as shown below. The power handle is subject to two modes of failure. Perhaps the most common is that the handle runs at full speed while the attachments run slow. Clean the attachments in alcohol and relubricate them with petroleum jelly using a toothpick as an applicator. Use very little jelly. Loss of attachments can be remedied by replacing or rebending the bow spring in the slot of the nose piece. Disassembly and Repair The case containing the power supply unit may be disassembled by withdrawing three screws in the deck and one screw in the bottom and lifting the deck. The latch and latch spring may be replaced by simply slipping the spring out of the grooves. If a voltage test with a VOM shows little or no voltage at the connector pins, disconnect the line cord from the outlet and pull out the retractable cord plug from the deck connector. With the blade of a screwdriver, piy and snap "off the shield and insulator fastened to the switch. This will expose the switch terminals. Now with the VOM set on R X 10 ohms range, trace the continuity of the primary circuit from one male prong of the cord set through the switch, through the transformer (95 ohms), the wire-nut connector, and out through the other male prong of cord set. An open-circuit reading will localize the defective part. Snap the metal shield and f ishpaper shroud back onto switch. Next set the VOM on R x 10 ohms range and read the resistance across the deck connector pins. Reverse the ohmmeter leads and read again. This will check the diode in the power pack. One direction should read continuity; reverse direction should read open. If not, the transformer pack is defective and must be replaced. Observe the original color code of all leads. Note: the exact resistance read in the forward direction will depend on the meter used and is not a comparative indication of quality. Caution: continuity and resistance checks must be made with a VOM. Do not use a 110V series light continuity tester or damage to low-voltage components will occur. If the switch or deck is defective, the entire deck and switch assembly may be easily replaced by loosening two screws holding the transformer and two screws holding the connector-pin board. The two leads to the switch terminals should be unsoldered and resoldered to the new switch terminals using care not to drop excess solder into the switch wafer. In reinstalling the connector-pin board, be certain the negative (black lead) pin is oriented nearest to the front edge of the deck. If the voltage test shows full 15V output from the power supply, or if the power supply transformer has been replaced, the following test must be performed. Pull the retractable cord plug out of the socket in the case. With a VOM on- R X 1 range, insert the probes into plug opening. Install the callus-smoother attachment onto nose piece and slowly turn the drum with fingers while watching ohmmeter. Do not spin it fast or developed counter voltage from the motor will give erratic readings. The reading should be approximately 12.5 ohms and at no point in a revolution should it be less than 10 ohms nor more than 20 ohms. If reading is uniformly about 12.5 ohms, the motor is okay. If on the other hand, the reading dips to less than 10 ohms, the motor is shorted. Replace the motor. A reading of more than 20 ohms means a motor segment is open. Replace the motor. If an open circuit is indicated, the cord is defective. Replace cord. As a final check, connect to the appliance 120V ac supply. Insert the cuticle pusher attachment and test for a handle speed of 2000 to 3000 rpm with a vibrating-reed tachometer held lightly against the tip of the cuticle pusher.
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