Bench test of usage meter power supply, control circuitry and meter; began reinstallation of PS into 1132

USAGE METER BOX TESTING

I applied 230V to the meter supply to verify it produced 41VAC which drives the usage meter on the printer. The usage meter control box js inside the printer frame, with the wires that would normally be connected to TB1 terminals 3 and 4 available for connection. Inside the meter box I can check for 41VAC across terminals 3 and 4 of the terminal strip inside. 

At one time IBM charged customers by the hour on rental contracts, thus the usage meter was very important to generate revenue for the company. After the anti-trust lawsuits by the US government, IBM no longer rented products nor charged by the hour of usage, but the meters remained on the equipment for some time after. 

I tested that a small logic signal applied to the usage meter supply/control box would switch the 41VAC to the meter when pulled to ground and remove it when the logic signal rose to 6V or was disconnected.

To test this, I hooked 6VDC to terminal 6 of the strip and then connected terminal 9 to ground to test activation of the relays. With a voltmeter across 3 and 5 of the terminal block, I should see 41VAC when I ground terminal 9 and no voltage when the terminal is not grounded. 

Everything worked perfectly - the box is ready for reinstallation.

BEGAN WIRING UP POWER SUPPLY BOX

I bolted down the power supply box and then the usage meter power/control box, now that everything has been checked out. I then began the rewiring process, starting with terminal block 2. I am about half done with TB2 but have to stop working because I have a condo association meeting tonight.