
Service Related Menus 8712ET/ES and 8714ET/ES
Analog Bus Menu RF Network Analyzers
5-18 Service Guide
22 −15 V Supply Normal values are −16.5 to −13.5 DC volts
23 +12 V Supply Normal values are +13.5 to +10.5 DC volts.
A2 CPU Assembly Nodes
24 +5 V on CPU +5 V power supply on the CPU board. Normal
values are +4.5 to +5.5 volts.
25 +12 V Flash Prog Voltage +12 V Vpp supply for writing to the flash EPROM
on the CPU board. This voltage is normally OFF, so
the value should be less than +2.5 V. The “on”
voltage level is checked during the power-up tests,
and an error message is displayed if the level is
incorrect.
26 CPU Temp Temperature sensor on CPU board (CPU_TEMP on
the schematic). Typical values are 30 to 60° Celsius;
this will depend partly on the ambient temperature.
27 +15 V on CPU Normal values are +14.57 V to +16.43 V.
28 −12 V on CPU (−12.6 V Probe power node) The range is
−12.1V to −13.1 V.
29 5 V on DIN Keyboard 5 V applied to the external PC compatible keyboard.
The range is +4.99 V to +5.40 V.
30 −15 V Normal values are −16.43 V to −14.57 V.
Number Name Description
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