2
Installing the Probe
28
Keysight W2630 Series DDR2 DRAM BGA Probes Installation Guide
Equipment required for rework:
• W2639A oscilloscope probe board adapter (1 of 2).
• Soldering iron.
To remove the VREF termination on the W2639A DDR2 oscilloscope probe board adapter for use
with the W2631A DDR2 x16 BGA probe:
1 The VREF signal is connected to the W2639A oscilloscope probe board adapter via the left flex
wing of the W2631A DDR2 BGA probe on TP11 as shown in Table 1.
2 Remove the 37.4 ohm resistor located near TP11 with a soldering iron as shown in the following
figure to disconnect the signal from GND. This will open the path to VREF.
Figure 16 W2639A oscilloscope probe adapter board
Figure 17 Location of the 37.4 ohm resistor for TP11 on the W2639A oscilloscope probe board adapter