Teac MT-20D-IO Maintenance Manual page 114

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4-2-6 Initialization of SOB
The SOB (Simulator OB) is a simulator to test the overall ~ITU including the
PCBA Interface Control.
This simulator permits the error rate, etc. to be checked with MTU set to
online status.
The PCBA Interface Control can also be adjusted and tested by connecting
SOB.
Prior to the use of SOB, perform the following initialization.
(1) Preset the output voltages of the DC power supply to +12 V and +5 V.
(2) Turn off the DC power supply, and connect the power cable to the DC
PWR connector of SOB.
(3)
Connect the power cable to the POWER connector J2 of MTU.
(4) Connect the interface cable between the MT-2ST INTERFACE connector of
SOB and JI of MTU, so that the triangular mark of the connector is
set to the terminals 1 and 2 side.
(5) Turn on the DC power supply.
(6) Check if the power voltage supplied to MTU is within the range of -5%
to +5% of the rated voltage, using a digital voltmeter (DCV).
Between TPI5 and TPI8 of PCBA Drive Control: +12 V power voltage
(11.4 to 12.6 V)
Between TP16 and TPl8 of PCBA Drive Control: +5 V power voltage
(4.75 to 5.25 V)
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