VERAULT
Veteran Member
So In a recent pickup I got a TRS-80 15 meg hard drive with ribbon cables. IT was disgusting inside and out.. like a black soot or industrial grime. Seller said he didnt know anything about it or what it goes to but the unit has no power. First thing I did was scrub everything inside and out and clean the internal psu pcbs etc.
I put the unit back together for testing with a junky ide hard drive for a load and nothing. I am getting no voltages. I started probing for AC voltage and wasnt getting any. The units AC power comes in and goes directly to a relay before going out to the AC fan and a junction block to the psu. The unit had 3 indicator lamps: ACTIVE, PROTECT, and POWER. Only PROTECT seems to be a button you can push, the other two appear to be lamps.. which is strange because that means this unit has no power button. Unless I am missing something and the computer turns this thing on.
Anyway I opened up the relay and tested the winding, I thought I had a break but I am getting 169 Ohms across the coil. Here is a photo of the relay. If this thing doesnt engage it wont give ac power to the system. So what am I missing? Anyone have experience with these drives? ITs built like a tank, I am impressed with its construction.
I put the unit back together for testing with a junky ide hard drive for a load and nothing. I am getting no voltages. I started probing for AC voltage and wasnt getting any. The units AC power comes in and goes directly to a relay before going out to the AC fan and a junction block to the psu. The unit had 3 indicator lamps: ACTIVE, PROTECT, and POWER. Only PROTECT seems to be a button you can push, the other two appear to be lamps.. which is strange because that means this unit has no power button. Unless I am missing something and the computer turns this thing on.
Anyway I opened up the relay and tested the winding, I thought I had a break but I am getting 169 Ohms across the coil. Here is a photo of the relay. If this thing doesnt engage it wont give ac power to the system. So what am I missing? Anyone have experience with these drives? ITs built like a tank, I am impressed with its construction.
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