Field Maintenance; Objective; Required Equipment - Omron 8025G Maintenance Manual

MAINTENANCE AND REPAIR
SECI'ION 6
tarnish.
ABRASIVE.
NOTE: DO NOT remove any circuit card unless removal is required by
other maintenance requirements.
CAUTION: MOS ELEMENTS USED ON CIRCUIT CARDS ARE EASILY DAMAGED
BY STATIC DISCHARGE. ALWAYS HANDLE CARDS SO THAT NO
DISCHARGE FLOWS THROUGH THE CARD.
BEFORE TOUCHING A CARD, PLACE ONE HAND ON THE TERMINAL
CHASSIS. KEEPING THAT HAND ON THE CHASSIS, USE YOUR
OTHE R HAND FOR THE CARD.
If a card must be removed, check the gold-plated edge contacts for
Clean with a soft cloth and some contact cleaner. NEVER CLEAN WITH AN
Check the mating connector on the mother board for distorted contacts, es-
pecially if the card does not seat smoothly and fully. DO NOT attempt to clean the
contacts except with a spray contact cleaner.
8025 CRT Display. If cabinet removal is required, make certain that the
circuit card edge connector and the CRT connectors are properly seated. Check for
corona discharge (high voltage arcing). If present, remove dust from all high volt-
lage leads and apply anti-corona lacquer/dope.
Confirm that all display parameters (e.g., centering, linearity, and width)
are set for a normal presentation. (See Figure 7-3 in Section 7.) Make the requir-
ed adjustments for normal presentation (refer to paragraph 7.4 in Section 7).
Clean the CRT face with a nonabrasive glass cleaner.
6.2 FIELD MAINTENANCE
This paragraph tells how to isolate malfunctions in the 8025 CRT Terminal
to field-replaceable parts. Included are a troubleshooting procedure and a guide.
Information also includes removal and replacement procedures normally used in field
maintenance.
6.2.1 Objective
Field maintenance is intended to make the terminal operational in the least
time, with minimum equipment. This objective is best met by isolating the problem
to one of the recommended field replaceable parts and
installin~
an operational part.
Field replaceable parts are listed in paragraph 6.2.4.
6.2.2 Required Equipment
The following equipment is used in field maintenance.
Triplett 310 Multimeter or equivalent
One set of circuit cards (see paragraph 6.2.4)
6-3