Operating instructions

6.1 Transport Alignment
To make these adjustments, the following items are necessary:
❑ A suitable test tape, preferably 320 nanoWebers per meter (nWb/m)
reference level. The tape should be compatible with the head format
(i.e., 8, 16 or 24 track).
❑ A test oscillator capable of generating the following frequencies: 125 Hz,
700 Hz or 1 kHz, 10 kHz, and 15 kHz at +4 dBu or the standard operating
level for the studio. In addition, the 10 kHz output should be available at
-30 dBu.
❑ A reel of 1" or 2" recording tape of the type normally used for sessions
(i.e., Scotch #226 or its equivalent).
❑ A non-metallic alignment screwdriver whose blade is small enough to be
inserted in the trimmers of the multi-turn potentiometers on the AUDIO
PCB Assemblies.
❑ EXTENDER PCB Assembly
6.1.1 Transport Deck Plate
The alignment/servicing procedures described in the following sub-sections
of this manual may require removal of the transport cover plate for access to
various components.
6.1.1.1 Opening and Closing the Transport Panel
The transport deck plate of the MTR-90III can be tilted up about 25° for very
easy access to the inside of the transport.
❑ Opening the Transport Panel
1. Remove the two screws under the upper lip of the VU Meter Panel.
2. Open the VU Meter Panel. Take care not to drop it.
3. Remove the three screws which are located underneath on each side of
the Transport Panel.
4. Lift the Transport Panel until it is fully locked into position. It is
dangerous to stop lifting on the way because the deck will drop to its
original position.
❑ Closing the Transport Panel
1. Make sure the VU Meter Panel is open.
2. Lower the Transport Panel down to the horizontal position.
3. Close the VU Meter Panel and secure with the three screws removed
when opening the Transport.
CAUTION! Do not close the Transport while the VU Meter Panel is closed.
Closing the Transport while the VU Meter Panel is closed will cause damage
to the shield motor.
Section 6 Alignment
6 - 2
October 1990
MTR-90III Operation and Maintenance Manual