TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
circuit board assemblies are shown in figures FO-3 through FO-19.
Complete wiring interconnection diagrams are
presented in tables 6-5 through 6-21 (Section VI).
6-6.
malfunctions of the test pattern generator. Check the adjustment procedure in Section V to establish that a particular
failure has definitely occurred. Often a symptom of difficulty can be traced to improper adjustment.
WARNING
Even low voltages commonly present in transistorized circuits are potentially
dangerous. Additionally, full line voltage is present on fuse terminals, power
switch terminals and other exposed points within the interior of the unit, and are
accessible when the cover of the equipment is removed. Refer to (FO-20 and FO-
22) to learn the areas containing high voltage in the equipment. Be careful not to
contact high voltage connections when troubleshooting this equipment.
SECTION IV. REPAIR
6-7.
Introduction. This section describes the repair instructions for the test pattern generator and consists of removal
and replacement procedures for the printed circuit cards, front panel, rear panel and power supply components. Visual
aids for the procedures are provided with schematics, parts location diagrams and interconnection wiring lists.
6-8.
Removal and Replacement Procedures. See figures FO-20 through FO-23 for component locations and refer
to table 6-2 for the wiring interconnection lists during the following removal and replacement procedures.
6-9.
Printed Circuit Cards. The printed circuit cards are located in the card file behind the front panel shown in figure
FO-20. The cards are positioned in the unit from right to left as shown in figure FO-21. For convenience, table 6-2
references the part number of the card, card location and functional name of each card. The circuit cards may be
removed and replaced by performing the following procedure:
a.
Removal.
(1) Remove the eight screws securing the top panel to cabinet to gain access to the circuit card file.
(2) Remove the circuit card by grasping the top corners of the card and gently wiggle the card to release
from connector. Pull card straight out.
6-2
