Operating instructions

October 1990
A - 1
Appendix A
An external clock (reference oscillator) can be used to control the speed of
the MTR-90III capstan motor. When the SPEED MODE switch is set to the
EXT position (see § 3.2), a suitable input signal must be applied to P/N18 of
the EXT CLOCK input connector (25 pin Honda connector on the MTR-90III
rear panel) or P/N20 of the PARALLEL I/O connector. The reference
frequency is 9,600 Hz, and should be at TTL level (0 V low, +5V high),
approximately a 50% duty cycle; a sine wave source may be used at a level of
about 10 Vp-p.
When the external reference is in use, the HIGH/LOW SPEED SELECT switch
still operates although tape speeds (15/30 ips or 7.5/15 ips) vary
proportional to the deviations of the clock input from the reference frequency.
When using SMPTE time code synchronizers, the SMPTE-CUE slide switch
(on the back of the upper card cage mother board near the #24 card
connector) should be turned on to activate Lifter Defeat. If the MTR-90III is
being used for 16 track operation, a jumper cable will have to be installed to
join the 3-pin Molex connector adjacent to this switch to a similar connector
on the same circuit board located between the #16 and #17 card connectors
(#8 and #9 for 8 track operation).
Detailed information on using time code synchronizers with the MTR-90III is
available from the manufacturer of the equipment or by contacting OTARI.
CAUTION! Do not feed two 9.6 kHz signals from both the EXT CLOCK and
PARALLEL I/O connectors at the same time. If two different signals are
recieved from the EXT CLOCK and the Parallel I/O at the same time, the MTR-
90III may malfunction.
SMPTE Location Control and Synchronization ...................... A-2
Adams-Smith 2600 SMPTE Synchronizers .......................... A-4
BTX Shadow Synchronizer ............................................ A-6
Audio Kinetic Q-Lock Mod. 2.10 Synchronizer ..................... A-7
EECO MQS 100 Synchronizer ......................................... A-8