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Reply to "Z4000"

@Jon G posted:

If the serial number is 0398, it is the first run of transformers.  Some, but not all, had voltage leakage problems (voltmeter will display about 1-2 volts when levers are down).  Not a major problem, but some people shy away from them.  It can be corrected, but you have to add 4 surface mount capacitors to one leg of 4 ICs on the power board (not easy).  Also, the first run uses a sleeve bearing fan (noisy when they fail) and unique boards that may/may not still be available and are not compatible with later runs.

Great info.   I bought mine used, will have to check the serial number.

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

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