Operating instructions

Table 2-4
Cue Level Attenuation Selector: BIAS CONTROL PCA
SWITCH POSITION TAPE SPEED AUDIO EFFECT AT WIND SPEEDS
SW4 ON 15/30 ips Not Changed
SW4 OFF 15/30 ips Attenuated
F. All cards should be firmly seated in their mating connectors and in
the correct locations.
G. Close the doors to the card cages.
3. From the front of the machine, check the connectors and components
beneath the MTR-90III transport.
A. Remove the 3 allen head cap screws along the slot in the front of
the unit just above the VU meter panel. The meter panel is hinged
along its lower edge and is held closed by friction from rubber
gaskets.
B. Grasp the rail just below the screw holes and gently pull while
pivoting the meter panel open until the safety latches hold it in a
horizontal position. Do not to drop the panel when pulling it.
C. Check the following connectors to be sure they are firmly mated.
❑ The connector on the bracket for each Take-Up reel motor
assembly.
❑ The 3 connectors located on the head shield retraction
mechanism (beneath the head assembly).
❑ The connector on the black sensor beneath each swing arm
assembly.
❑ The connector on the tachometer (beneath the tachometer
roller on the Supply side of the transport).
❑ The 3 connectors near the tape lifter solenoid (below the head
assembly on the Supply reel side).
❑ The connectors on the CAPSTAN MOTOR PCB Assembly and
the connector which is located below the head assembly near
the capstan motor.
❑ The 3 connectors on the VU METER PCB Assembly and all the
small connectors for the READY-REC LED PCB Assemblies
mounted with the VU meters.
D. Check for any obviously loose or damaged components and any cut
or broken wires. Then close the meter panel and reinstall the 3
screws removed in Step 3A.
4. From the rear of the machine, check the connectors and components
behind the upper card cage.
A. Remove the 6 phillips head screws, dress washers, and nylon
washers that secure the edges of the middle panel on the back of
the machine (the one with the XLR connectors). The panel is hinged
along its lower edge and by gently pulling the top, it will pivot open
until its safety latches hold it in a horizontal position.
B. Remove the 4 phillips head screws, dress washers and nylon
washers that secure the edges of the top panel on the back of the
machine (the one with the fan). This panel is also hinged along its
lower edge.
Section 2 Installation
2 - 4
October 1990
MTR-90III Operation and Maintenance Manual