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The 54003 is discontinued. The recommended replacement is: 54091
Balboa - Circuit Board, Duplex Digital - 54003
This Printed Circuit Board Assembly Requires a 120V Power Supply and Can Work with Any Duplex Digital.
Replacement Option For: MFG #1900DR1A, #1900DR1D, #2500ESR1C, #410ER1C, #50084-01R. #50911, #51405, #51421, #51542, #51569, #51586, #54003, #611311, #9710-09, #ALP50R1C, #BH50D, #C11JDR1A, #C11JDR1B, #DAK50R1B, #DIGDUPR1A, #DS50R1A, #DS50R1C, #DYN100R1E, #DYN100R1C, #MAS125R1A, #MOR100R1B, #P295R1A, #RET50R1A, #SS23DR1B, #SS23DR1C, #VIK100R1A, #VIK100R1B, #ZX500DR1A, 50884-01R , 1900DR1A , 1900DR1D , 2500ESR1(x) , 2500ESR1C , 2500ESR2A , 410ER1C , 50884-01 , 50884-01R , 50911 , 51405 , 51421 , 51542 , 51569 , 51569-02 , 51586 , 51859 , 53210 , 54003-REMAN , 611311 , 6300DR1(x) , 6300DR1A , 9710-09 , 9710-58 , ALP50R1(x) , ALP50R1C , BAL54003 , BH50D , C11JDR1A , C11JDR1B , DAK50R1B , DIGDUPR1(x) , DIGDUPR1A , DS50R1A , DS50R1C , DYN100R!E , DYN100R1C , MAS125R1A , MIL75R1B , MOR100R1B , NOR124R1 , NOR124R1(x) , P295R1A , RET50R1A , SS23DR1B , SS23DR1C , VIK100R1A , VIK100R1B , ZX500DR1A, 3-60-0049