Agilent Technologies 53150A, Service Manual

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Chapter 2 Service
Troubleshooting the Counter
2-14 Assembly Level Service Guide
2
Table 2-2 lists A4 Power Supply’s input and output voltages, the
corresponding wire color for each input and output, and the tolerances
specified for these voltages.
Adjusting the +5 VDC Output
The +5 VDC output of the power supply is adjustable. If this voltage is
found to be outside of the tolerance range listed in Table 2-2, it can be
adjusted using R23, which is visible on the top surface of the power
supply’s circuit board. When adjusting the +5 VDC output, use a
non-metallic or insulated adjustment tool.
Table 2-2. A4 Power Supply Inputs and Outputs
Input/Output Voltage Connector and Pin Designation Wire Color Tolerance
AC-input (neutral) 0 VAC* TB1, pin N blue —
AC-input (line in)
85 - 264 VAC*
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 10 (bottom of motherboard) red ±1%
0.0 VDC (ground for +5 VDC) TB2, pin 8 black —
* AC-input values are referenced to chassis ground.