I will try searching for Collaro pin-outs. The tone arm movements are mechanically driven by the platter via gearing, as seems to be common with idler drive tables. The cartridge is not an issue, it has a separate 3 pin socket. I agree, not an earth ground, but still a ground. I'm fairly certain the green wire connecting the motor housing to the chassis steel is a ground. I'm not sure what the purpose of the capacitor is in this case, as it seems to only be there to short 2 of 3 power leads from the cabinet. There is also a green wire that goes from one of the bolts holding the motor together, to one of the bolts that holds the platter gear bracket to the metal top chassis. There is a capacitor outside the red box that connects the yellow wire from pin 2 to the black wire on pin 3. The third pin is a black wire that goes to the red box on the side away from the motor. Connected to the yellow wire inside the red box is a black wire that goes to the motor. The second pin is a yellow wire that goes to the red box next to the motor. There is a 3 pin jack, the first pin is the red wire which goes strait to the motor. For some reason one of the previous people to work on it decided to tape the black wire to the yellow wire, they were not electrically connected there. The black wire leading from the plug to the red box, which is diffrent from the black wire going from the box to the motor, had part of the insulation stripped. Maybe a pic of the top will jog a few memories. I see the yellow wire seems to be either repaired or had another conductor bridged off of it. Otherwise, Take the two wires off the motor and marrette the AC to see if they still work. A serach for Collaro wiring scemes may be of help. As to what wires do what in your turntable, Micromatic is a changer made by Collaro of England. Grounding for the cartridge is moot as it is a ceramic. Also, in the 60's, many houses still had 2 wire outlets, or even knob and tube wiring that never had standardised hot and common sides. Grounding to earth is not necessary for that kind of audio gear, therefor was never implemented. The others are either for the switch to the amplifier or a step down transformer built into the motor winding to give a smaller voltage to early transistor electronics. I mistitled this, what I need is the pin-out, not the wire diagram, voltage and purpose.įirst things first, nothing in your record changer is a "ground" Two wires will be direct to AC. I suspect the wiring for this type of player follows one of a few patterns. It is a basic 4-speed idler drive record changer. The switch on the top has no wires, just a bar, so I think the red box is a mechanical switch, although it never seems to visibly make contact. I never understood why it is legal for electronics with metal enclosures to not have a safety ground with a 3 prong cord. With live voltage being fed into the chassis, I'm suprised it didn't electrocute me, or whoever mangled it while it was in the cabinet. These tests were done with the power switch in the off position. The yellow wire on the jack has no connection to the ground bolt. The portion of the motors black wire not connected to the motor, but leaving the red box has a connection to the ground bolt that fluctuates randomly between 8-36 mega ohm. The black wire leaving the motor has a random connection no connection to the ground bout. The red wire never has a connection to the motor's green grounding lead. I'm not sure what a baseball sized AC motor would normally read. I know there is a lot of copper but that seems high. I cut the two wires to measure the motor separately. Can you disconnect the motor and see what the continuity is like? I do not like that it is tripping a breaker though. I suspect that the three wires are for wiring in the amplifier switch. There are just 3 input wires, If I knew what they were supposed to have, I could rig something to test this. Is there another possibility? I'm used to working on things with DC brush motors. I suspect this means the motor windings have failed. Only then did I remember, it was an off day, that I should do my tests before plugging stuff in. Being told this and knowing it is wall current, I rigged a 3 prong cord and instantly tripped the circuit breaker. There is a 3 wire plug red, yellow, black. One of the people there who is a repairman, said that meant that I shorted the meter to ground. I connected the lead to the center and my meter threw sparks and melted the tip of the probe. I tried to get the voltages with a multimeter. the service manual just says oil it regularly. If powered on the record player makes no sound what so ever, and attempting to start it by hand has no effect. The alignment was so bad on the auto drop as to dislocate the gear and lock up. The record player cabinet used to run fine, then somebody mangled the turntable during a rental. I was asked to fix a magnavox micromatic model W801-01 00 REF NO6912.
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