A B757-200 FLT CREW EXPERIENCED EQPT OVHT EICAS MSG ALONG WITH SMOKY SMELL. THEY DECLARED AN EMERGENCY AND DIVERTED TO NEAREST SUITABLE AIRPORT.

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NORMAL CRUISE AT FL400. L PACK IN OFF POS FOR NOISE. RECEIVED THE FLT DECK EQUIP SMOKE EICAS MESSAGE. QRH PROC REVIEWED. IMMEDIATELY SELECTED L PACK BACK TO OPERATING POS. RECEIVED EQUIP OVERHEAT EICAS MESSAGE ACCOMPANIED BY ACRID SMELL OF SMOKE OR ELECTRICAL FIRE. ALL OCCUPANTS ON OXYGEN FOR REMAINDER OF FLT. QRH PROC FOR EQUIP OVERHEAT ACCOMPLISHED TO ALTERNATE FAN. NEITHER LIGHT WENT OUT AND CHKLIST WAS DELAYED ACCORDING TO INSTRUCTIONS. DECLARED EMER AND PROCEEDED TO NEAREST SUITABLE ARPT ZZZ. WX DISPLAY MESSAGE ON HSI FOLLOWED ALMOST IMMEDIATELY BY THE LOSS OF BACKGND COLORING IN EADI. ATTEMPTED CONTACT WITH COMPANY AND UNABLE. ACARS WAS DEFERRED. ASKED CTR TO ADVISE COMPANY OF DIVERT AND EMER THAT HAD BEEN DECLARED. ASSIGNED 1 JUMPSEATER CTL OF HAZMAT ENVELOPE IN CASE OF GND EVAC. CONTINUED HIGH SPD DSCNT WITH ADDITIONAL MESSAGE L RECIRCULATION FAN EICAS MESSAGE. MADE VISUAL APCH TO RWY 17. COMPLIED WITH STABLE APCH CRITERIA AT 1000 FT AGL. LANDED AND EXITED RWY TO R ON TXWY AFTER QUERY FROM TWR REGARDING HAZMAT ON BOARD. STOPPED ACFT JUST CLR OF RWY AND SHUT DOWN ENGS AND ALL ELECTRICAL PWR. CFR IMMEDIATELY USED THERMAL IMAGING CAMERA TO DETERMINE STATUS. I WAS IN CONTACT WITH CHIEF AND ELECTED TO NOT PERFORM EMER EVAC. STAIRS WERE BROUGHT FROM FBO IN SHORT ORDER AND WE DEPLANED. ATTEMPTED CONTACT BY CELL PHONE WITH SYS OPS. LEFT MESSAGE THAT WAS RETURNED QUICKLY. I RECEIVED EXCELLENT SUPPORT FROM MY IMMEDIATE CONTACT PARTIES AT MY COMPANY.