Operating instructions

C. Check the following connectors to be sure they are firmly mated.
❑ The many connectors located on the back of the upper card
cage mother board.
❑ On the top panel there are three motor drive transistor
assemblies. Each assembly has two large connectors and three
small connectors. Check these connectors.
D. The SMPTE-CUE slide switch on the left side of the upper card cage
mother board should be set to the "OFF" position. This switch is only
used when externally linking the MTR-90III to a suitable SMPTE
(Society of Motion Picture and Television Engineers) time code
synchronizer. Refer to §4.2.11.
E. Check for any obviously loose or damaged components and any cut
or broken wires. Then close the middle and top panels and reinstall
the phillips screws, dress washers and nylon washers removed in
Step 4A.
CAUTION: When closing this back panel, use care to ensure that no wires are
pinched between the panel and MTR-90III chassis.
5. From the rear of the machine, check the connectors and components
behind the lower card cage.
A. Remove the 4 phillips head screws, dress washers and nylon
washers that secure the edges of the bottom panel on the back of
the machine (the one with the AC power and logic connectors). Lift
the bottom of the panel away from the machine, slide it down an
inch so its upper flange clears the hinge screws of the panel above,
then set the bottom panel aside. (The electrical connectors are
mounted to sub-plates that remain attached to the MTR-90III
chassis.)
CAUTION: Be sure the AC power cable is not connected to the MTR-90III
at this time.
B. Check the following connectors and components to be sure they are
firmly seated.
❑ The many connectors located on the back of the lower card
cage mother board.
❑ The 2 relays on the back of the lower card cage mother board
(they should be plugged in and secured with metal retaining
clips).
C. Check for any obviously loose or damaged components and any cut
or broken wires. Then replace the panel, inserting the upper flange
first so it clears the hinge screws of the panel above, and secure it
with the 4 screws, dress washers and nylon washers removed in
Step 5A.
D. Remove the 5 phillips head screws, dress washers and nylon
washes that secure the cover panel on the left side of the chassis.
check the several connectors mounted on the DS-1Z Power Supply
Assembly for proper engagement.
6. If minor faults or discrepancies are noted during the foregoing
inspection procedures, make the necessary corrections and/or
adjustments and proceed with the installation.
MTR-90III Operation and Maintenance Manual
October 1990
Section 2 Installation
2 - 5