Chapter 5 Service/Technical Assistance; Maintenance; Troubleshooting Guide; Troubleshooting Hints - Welch Allyn Scanteam 3700PDF Technical Manual

SERVICE/TECHNICAL ASSISTANCE
5.1

Maintenance

The Welch Allyn SCANTEAM 3700PDF Machine Mount CCD Bar Code Scanner and
Decoder is designed to provide reliable and efficient operation, requiring no routine
maintenance. The SCANTEAM 3700PDF has no moving physical parts. Convection air
flow serves to cool the unit. Maintenance, therefore is related to troubleshooting and
replacement of the SCANTEAM 3700PDF Machine Mount CCD.
Troubleshooting procedures are described in the following section. Section 5.4 provides
procedures for removing and replacing a SCANTEAM 3700PDF Machine Mount CCD.
5.2

Troubleshooting Guide

This section describes procedures for identifying problems that prevent the SCANTEAM
3700PDF from operating normally. Field repair procedures include the following:
Power supply troubleshooting
SCANTEAM 3700PDF Machine Mount CCD troubleshooting
5.2.1

Troubleshooting Hints

If there is no power to the SCANTEAM 3700PDF Machine Mount CCD, check the
following:
Host power supply output to the SCANTEAM 3700PDF. Check that the output
voltage from the host is +5 VDC. If the voltage isn't present or is out of range, there
may be a problem with power distribution from the host system. Appendix B
provides the specific voltage range.
If there is no output voltage, check to be sure the host instrument power switch is set
to "ON"; if this switch is on and there is no output voltage, there may be a problem
with the host power supply.
Check all cables for secure connections and continuity (with an ohm/volt/meter).
Warning: Only a qualified person should attempt to replace a power supply.
Service/Technical Assistance
5
5–1