Service 2
Keysight 53210A/53220A/53230A Assembly Level Service Guide 161
3 Reconnect the counter to the power source.
– The fan should begin to operate as soon as power is applied. The fan is
temperature-controlled and the fan speed (low-medium-high) will vary with
the internal temperature of the counter. If the internal battery (Option 300) is
installed and charging, the fan will be on high speed.
– If the fan does not operate at all, check the power supply voltages as
described below. If all the voltages are good, replace the fan (part number
33250-68501).If the +15V is missing, replace the AC Power Supply Assembly
(part number 0950-5175). If one or more of the other voltages are bad, replace
the motherboard.
– If the fan is operative, connect the negative lead of a voltmeter to the chassis
and verify that the voltages in Table 2-6 below match the voltages measured
at the test points on the Motherboard Assembly. See Figure 2-11 below for the
test point locations, as viewed from the top of the counter.
If unsure whether the fan is running, look at the fan blades on the back of the
counter to determine if the fan is running. On the low speed, the fan is very quiet.
Refer to Chapter 3, "Replacing Assemblies" in this service guide if you need to
remove or replace an assembly. If either the AC power supply assembly or the
motherboard is replaced, perform the appropriate calibration procedures in this
chapter.
BE CAREFUL to NOT short the positive lead of the voltmeter to the chassis
when probing at the testpoints on the Motherboard.
If the internal battery (Option 300) is installed, it will be necessary to remove it to
access the test points. See Chapter 3, "Replacing Assemblies" for information on
removing the battery.
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