GFP-750 Voltage Conversion
Converting from 120V to 240V operation 1. Disconnect the AC cord and remove the top cover 2. Move the blue secondary wire from P7 to P14 and move the white secondary wire from P6 to P13 see figure 1 below. 3. Change fuse F2 to 1A/250V SLB. 4. Change fuse F11 to 250mA/250V SLB. 5. Remove fuse F12. 6. Remove the rear panel mounted "switched AC-outlet" jack (J8 on schematic) and the black and red connecting leads from the jack to P15 and P8 on the circuit board. Cover the chassis hole with rubber blocking plate (ADCOM part #:25001002).
F12 = no fuse P15 BLU 234V P14 WHT
Optional: Connect Black to neutral P15 F12 = 1A F11 = 500MA P13 P6 P14 P7

BLK P5 P7

F11 = 250MA

F2 = 1A

Figure 1: Main transformer connections and fuse values for 240V operation. Converting from 240V to 120V operation 1. Disconnect the AC cord and remove the top cover 2. Move the blue secondary wire from P14 to P7 and move the white secondary wire from P13 to P6 see figure 2 below. 3. Change fuse F2 to 2A/250V SLB. 4. Change fuse F11 to 500mA/250V SLB. 5. Change fuse F12 to 1A/250V SLB. 6. (Optional) The GFP-750 240V version does not have a rear panel mounted "switched AC-outlet" jack. The position for this jack, at the top right hand side of the rear panel, has been blocked with a rubber plate on 240V versions. To add the "switched AC-outlet" you will need the female AC jack (ADCOM part # :25000750) and connecting wire set (ADCOM part #:48000075). Remove the rubber block and mount the AC-jack to the rear panel. Connect the black wire from P15 on the circuit board to the neutral (larger slot) connection of the new switched AC jack. Connect the red wire from P8 on the circuit board to the live (smaller slot) connection on the new switched AC jack.
Optional: Connect Red to live P8

BLK P5

117V F2 = 2A

BLU P4

Figure 2: Main transformer connections and fuse values for 120V operation 12