EG&G Princeton прикладные исследования 5209 синхронный усилитель

EG&G Princeton applied research 5209 lock-in amplifier. Unit powers on. Unit intermittently has no response to front panel buttons and function LED’s all illuminate. No further testing performed. Parts/repair. Condition : Good. Protective plastic film still over front panel. ***MPN 5209 ***OEM EG&G ***SKU*** 61853