7.3 Processor Unit: RPU-013
7-66
3. Block description of AC power board (03P9339)
Power supply interface
- POWER FAIL
This feature monitors the TP11 (+12 V) power supply line. POWER FAIL signal is
outputted when voltage is lowered on this line, and the switching power supply
become out of control.
When this signal is detected, this circuit generates an interrupt of MAIN CPU of
the SPU board, but this circuit is not used at present.
- MON MOTOR VLT
The voltage value can be monitored if the antenna motor is of a DC type. To monitor
the voltage value, execute [Menu] -> 9 -> 8 -> 2: SELF TEST and check the value
on “SCANNER MOTOR”.
- BP
BP signals from the antenna are inputted from the SPU board and control the
revolutions of the DC antenna motor.
- ANT SPEED
This signal controls the antenna revolving speed when the antenna motor is of the
type of DC/42 rpm (RSB-097). This setting is made in [Menu] -> 0 -> 3 -> 4: ANT
REVOLUTION. In AUTO setting, the number of revolutions can be automatically
set according to pulse length (S1, S2 / M, L).
- ANT ON
This signal controls ON/OFF of the antenna power supply when the antenna motor
is of DC type.
This setting can be made in [Menu] -> 0 -> 3 -> 5: ANT SW.
Power-ON
1. Generating control voltage for power supply circuit
AC power supply inputs are rectified at CR1 and C5 and generates power supply of
+12 VDC, +6.5 VDC and +5 VDC for the power supply control circuits on the
power supply circuit of a self-excited oscillation type comprised of Q1, Q2 T1 and
CR2 to 4.
2. Detecting input low voltage and over voltage
Input low voltage and over voltage is detected for input power supply at U11.
Detection signals control U12 via Q13 and 14. If the input voltage is out of the
specified range, U12 is not turned on.
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