2 Service82 Keysight 53147A/148A/149A Assembly Level Service GuideTable 2-3 lists A4 Power Supply's input and output voltages, the correspondingwire color for each input and output, and the tolerances specified for thesevoltages.Adjusting the +5 VDC OutputThe +5 VDC output of the power supply is adjustable. If this voltage is found to beoutside of the tolerance range listed in Table 2-3, it can be adjusted using R23,which is visible on the top surface of the power supply’s circuit board. Whenadjusting the +5 VDC output, use a nonmetallic or insulated adjustment tool.Table 2-3 A4 Power Supply Inputs and OutputsInput/Output Voltage Connector and Pin Designation Wire Color ToleranceAC-input (neutral) 0 VAC [a][a] AC-input values are referenced to chassis ground.TB1, pin N blue —AC-input (line in)85 - 264 VAC [a] TB1, pin L brown —–15.0 VDC @ 0.7 A max. TB2, pin 1 lavender ±3%0.0 VDC (ground for –15 VDC) TB2, pin 2 brown —N/A (unused) TB2, pin position 3 (no pin) N/A —N/A (unused) TB2, pin 4+15.0 VDC @ 2 A max. TB2, pin 5 blue ±5%0.0 VDC (ground for +15 VDC) TB2, pin 6 brown —+5.0 VDC @ 5A max. TP 13 (bottom of motherboard) red ±1%0.0 VDC (ground for +5 VDC) TB2, pin 8 black —
