User guide

I-E67-84-1B February,2002 16-1
SECTION 16 - REPLACEMENT PROCEDURES
INTRODUCTION
Due to the modular design of the TB84PH
Advantage Series analyzer, the replacement of
an assembly can be easily completed.
Replacements are available for each major
assembly. These include the pH/ORP/pION input
PCB, microprocessor PCB, power supply PCB,
front bezel, shell, and rear cover assemblies.
This section provides removal and installation
procedures for these assemblies. Use Figure
16-1 as a reference during removal and
installation procedures.
NOTE: Refer to Section 3 for special handling
procedures when removal of electronic assemblies
is required.
WARNING Substitution of any components other than
those assemblies listed in this section will
compromise the certification listed on the
analyzer nameplate. Invalidating the
certifications can lead to unsafe conditions
that can injure personnel and damage
equipment.
WARNING Do not disconnect equipment unless power has
been switched off at the source or the area
is known to be nonhazardous. Disconnecting
equipment in a hazardous location with source
power on can produce an ignition-capable arc
that can injure personnel and damage
equipment.
ELECTRONIC ASSEMBLY REMOVAL/REPLACEMENT
1. Turn off power to the analyzer. Allow at
least 1 minute for the analyzer to discharge.
2. Remove the Front Bezel Assembly by
unscrewing the four captive screws and lightly
pulling the bezel from the shell.