General; Troubleshooting - Epson MX-80 Technical Manual

6.1 General
This chapter covers the simple, quick troubleshooting procedures of the MX-80 to be
followed by the operators who have only the fundamental knowledge of the construction and
operating principle of the printer or by those who do not have sufficient tools and measuring
instruments.
In a strict sense, it is considered advisable to conduct the troubleshooting of the MX-80 with
some tools and measuring instruments prepared as the minimum requirements, by first
locating causes of trouble and then replacing the defective components. Since the MX-80
can be simply disassembled into the electrical circuit block and the M-321 0 printer mechan-
ism block, a certain degree of trouble in the MX-80 can be solved by cut-and-try methods,
namely, by presuming the troubled part and replacing it with a new component.
6.2 Troubleshooting
For troubleshooting the MX-80, it is first necessary to presume in which block of the printer
the cause of trouble lies, the electric circuit block or M-3210 printer mechanism block. In
troubleshooting without measuring instruments. this presumption must be made from the
abnormal symptom presently existing in the Printer. The troubleshooting methods described
in this chapter require no special measuring instruments but require the tools listed as class
"A" in Table 3.1. Chapter 3 as the minimum requirements for repair. In addition. the trouble-
shooting methods are described on the basis of replacing only the components listed in
Table 6.1. Replacement of other components cannot be made. as they require the adjust-
ments of the MX-80 as described in Section 4.3. Chapter 4, or troubleshooting with measur-
ing instruments such as oscilloscope, etc.
To replace any defective components listed in Table 6.1. be sure to observe the disassembly
and assembly procedures described in Section 3.3, Chapter 3.
Table 6.1 Replaceable Components in Simple Troubleshooting
Block Name of component
Electric circuit • Driver circuit board
• Control circuit board
• Power trasformer
Printer mechanism
• M-321 0 mechanism
• Print head unit
NOTE: Avoid touching other components. circuit elements or mechanical parts without use of required measur-
ing instruments and tools, or the MX-80 may be damaged crucially.
6-1
REV. A