OHAUS STARTER 5000, Service Manual

Page: 16 / 40

CHAPTER 2 DIAGNOSIS
ST5000 Bench Top pH Meter
Service Manual 2-1 Ohaus Corporation www.ohaus.com
2. DIAGNOSIS
This section contains information needed to properly evaluate the reported problem and
diagnose its cause.
2.1 EQUIPMENT SETUP AND EXAMINATION
Set up the equipment according to the Instruction manual. And examine the equipment for any
physical damage.
2.2 PRELIMINARY CHECKS
Power-up the equipment using the
equipment’s original AC adapter. In the case where the
equipment will not power up, check the AC adapter.
2.3 TROUBLESHOOTING TABLES
Troubleshooting tables 2-1 through 2-2 identifies actual types of problems that could be
encountered with the equipment.
TABLE 2-1. EQUIPMENT WILL NOT TURN ON WITH AC ADAPTER
SYMPTOM PROBABLE CAUSE REMEDY
Unit will not turn on
with AC adapter
supplied. Adapter defective
Bad connection from
Adapter to equipment power
input.
Defective main PCBA
Check the AC adapter voltage output
(Table 1.1 Specification). If voltage is
low or nonexistent, replace the AC
adapter.
If OK, proceed.
Make sure appropriate AC Adapter is
used.
Check power input connection.
Replace main PCBA