Kongsberg Simrad RA83, Service Manual

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(+40V-+40V-R)
J3-1 (HC)
Heading contact 5 to 0 V Width 61 ms 1 pulse/round on 25 rpm
J4-1 (V) Photo coupler diode voltage 1.15 Vdc
J4-2 (AZI) Photo coupler out 0.78 to 5 V Duty: 11.11 ms Width: 6.6 ms on 25 rpm
J4-5 (MOTOR+) Motor drive voltage 10.5 Vdc
-4 (MOTOR-)
TB1 (HV) High voltage 257 Vdc
CR5 anode side MAG. heater voltage line 8.0 Vdc on ST’BY
6.5 Vdc on L pulse
6.7 Vdc on M2 pulse
6.9 Vdc on M1 pulse
7.5 Vdc on S pulse
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When the Modulator Board (E48-100*) is replaced, you need to set up specific functional
parameters using the presets provided on the board. See the Table-2.4 for the relevant presets and
rated setting value.
Table-2.4 Presets and rated ranges on the Modulator Board
Modulator Board (E48-100A)
Adjustment Conditions Measuring point Setting range
Magnetron heater voltage
(WARNING: Never attempt to transmit while the measurement!)
R69 (HT LP) ST’BY
T101 pin 4 and pin 6 4.8+/-0.1Vdc
(Connect TP8 to ground)
R86 (HT STB) ST’BY T101 pin 4 and pin 6 6.3+/-0.1Vdc
(Set TP8 open)
High voltage
R65 (HV ADJ)
TX ON TB1 and ground 257+/-1Vdc
TX pulse width
R66 (PULSE W)
TX ON/S pulse, TP2 and ground 55+/-5ns
5V to 0V (negative pulse)
Motor speed (Standard: 25rpm)
R58 (SPEED S) TX ON
J4-5 and J4-4 10.5+/-1Vdc
Motor current limiter
R70 (CLIMIT)
Standard speed, TX ON
R70-2 and TP5 (40V-R) 0.14+/-0.01Vdc
IF AMP Board (E41-200A)
Adjustment
Conditions Measuring point Setting range
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Video level
R1 (VIDEO) L pulse, TX ON Modulator Board TP11 -3.5+/-0.1Vp-p*
*Main bang echo
93842105-00
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