Page 3.2
SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue d May 2002
Chapter 3
Fault Diagnosis
Introduction
The AT-2plus is designed to be simple to use and simple to service: the service philosophy of the
AT-2plus is module replacement and not board repair. The purpose of this chapter is to provide
fault-finding procedures that will quickly and efficiently identify a fault to a specific module.
Fault-finding procedures are designed so that test equipment is kept to a minimum.
The AT-2plus contains the following modules:
•
MK 14-10 Main Board including main and LCD power supplies
•
RS-232 Interface board ( or Modem Interface board)
•
LCD screen assembly
•
Alphanumerical keyboard (integral part of the top assembly)
•
Printer assembly
An initial fault-finding table is provided detailing general fault indications. Use the procedures
on the following pages to indicate a faulty area or module. In most cases the fault finding tables
should indicate the most likely faulty area. When more than one module is stated, the first module
given is the one most likely to contain the fault. Other modules given should be checked in the
order given. When a module has been replaced specific test parameters and setting-up of the
module may be applicable. The removal and replacement instructions for all replaceable modules,
along with any setup or check procedures required, are given in Chapters 4 and 5.
If the initial fault-finding table does not indicate the area where the fault exists, re-check all the
settings and parameters that have been entered. If these are correct, check the software.
