Section Ill. TROUBLESHOOTING

TM 11-7025-217-30

Section Ill. TROUBLESHOOTING

2-6. TROUBLESHOOTING INFORMATION

This section contains troubleshooting information for locating and correcting malfunctions in the printer

at the direct support level of maintenance. Included are checkout procedures, troubleshooting procedures,

and procedures for running the diagnostic tests.

NOTE

The procedures contained in this section are in addition to the

troubleshooting procedures found in Chapter 8 of

TM 11-7021-201-12.

2-7. GENERAL INSTRUCTIONS

a. The first step in servicing a defective printer is to trace the fault to a major component. This is

called SECTIONALIZATION, which is a series of checks and operational tests, These tests will help

determine the exact nature of the fault. Operational tests can be made by following the preventive

maintenance checks and services contained in TM 11-7021-201-12.

b. The second step is to trace the fault to a particular module or assembly. This is called

LOCALIZATION.

c. The final step is to trace the fault to a defective part or assembly. This is called' ISOLATION,

d. Localization and isolation of a fault are determined by visual inspection, voltage and resistance

measurements, and use of the troubleshooting flowcharts. Visual inspection will locate many faults

without testing the circuits. All visual signs should be observed and an attempt made to localize the fault.

NOTE

In all tests, the possibility of intermittent troubles should be

investigated. Jarring, or tapping the equipment, or jiggling a

wire may expose this type of problem.

2-8. PRINTER TROUBLESHOOTING

The objective of direct support troubleshooting is the localization of a fault to a defective assembly or

cable. Use the troubleshooting flowcharts and Preventive Maintenance Checks and Services (PMCS) in

TM 11-7021-201-12 as an aid in localizing the fault.

2-9. USE OF TROUBLESHOOTING FLOWCHARTS

a. The troubleshooting flowcharts contained in this manual supplement the operational procedures

and troubleshooting information contained in TM 11-7021-201-12.

b. The troubleshooting flowcharts are indexed by malfunction/symptom. At the beginning of each

procedure, all probable causes for that symptom are listed.

c. Operational checks or organizational maintenance may have designated a problem or defect. Locate

that malfunction in the symptom index.

d. How to use the flowchart (para 2-10) will familiarize users of this manual with the proper use of

troubleshooting flowcharts.

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