Agilent Technologies 35670A Service Manual download pdf (Page 49)

Service Guide 4

Agilent 35670A Supplement 49

A9 NVRAM

The NVRAM is in now incorporated into the A17 CPU board and

the following information should be transferred to the A17

signal descriptions:

Everything else in the section should be disregarded.

A99 Motherboard

Disregard the sections on HSYNC, VDATA, and VSYNC

Page in original guide 9-12, 13

PROTCTn Protect–A low on this line disables the battery-backed static RAM. This line is low during

power-up and power-down, when the CPU assembly’s microprocessor is externally reset, and

when +5 volts is too low.

VBATT Battery Voltage–This line provides the power to the battery-backed static RAM and real time

clock. When the analyzer is on, the +5 volts provides the power for this line. When the

analyzer is off, the battery on the A17 board provides the power for this line. Since power is

applied to the static RAM even when the analyzer is off, the static RAM is non-volatile.

Page in original guide 9-31,33

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Agilent Technologies 35670A Service Manual Page 49