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6:43 PM
POWER-SUPPLY TESTS
POWER-SUPPLY TESTS Mod. 33, 35/40, 56/57, 76/77, 85, 90 and 95 |
The Problem: You have a Mod. 33, 56/57, 76/77, 90 or 85 / 95 and want to test the power-supply. Bad luck: these power-supplies are switched electronically over the systemboard and have no AC-switch. What if the board is dead or the tiny little switch in the front-panel is broken ? Isn't there a way to test the power-supply without the system around ?The Solution: Yes - it is possible to test these units. Look in this page. | |
Mod. 95 Power Connector
Then short-circuit the pins 1 and 2 on the power supply.The power-supply cooling fan must come up almost immediately - if you hear just a tiny clicking noise from the unit and have the short checked again for a good connection the power-supply is defective and has to be replaced. If the built-in fan comes up, check the 3 testing points for their appropriate voltages. If they are within the given range the power-supply appears to be functional. | |
Mod. 90 Power Connector
Then short-circuit the pins 7 and 8 on the power-supply connector P2.The power-supply cooling fan must come up almost immediately - if you hear just a tiny clicking noise from the unit and have the short checked again for a good connection the power-supply is defective and has to be replaced. If the built-in fan comes up, check the 4 testing points on P1 and P2 for their appropriate voltages. If they are within the given range the power-supply appears to be functional. | |
Mod. 33, 35/40, 56/57, 76/77 Power Connector
Then short-circuit the pins 6 and 4 on the power-supply connector P2.The power-supply cooling fan must come up almost immediately - if you hear just a tiny clicking noise from the unit and have the short checked again for a good connection the power-supply is defective and has to be replaced. If the built-in fan comes up, check the 4 testing points on P1 and P2 for their appropriate voltages. If they are within the given range the power-supply appears to be functional. |