Specifications

Chapter 2 Service
Troubleshooting the Counter
Assembly-Level Service Guide 151
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.
NOTE 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.
• 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.
NOTE 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.
• 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.
CAUTION BE CAREFUL to NOT short the positive lead of the voltmeter to
the chassis when probing at the testpoints on the Motherboard.
NOTE 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.