Difference between revisions of "Display data receiver adjustment procedure for TouchLine stations"
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This procedure describes the adjustmet of the receiver in the TouchLine display stations based on the Motorola 68HC05 microcontroller. The relevant boards are | This procedure describes the adjustmet of the receiver in the TouchLine display stations based on the Motorola 68HC05 microcontroller. The relevant boards are |
Revision as of 09:42, 10 August 2007
== TochLine station display data receiver adjustment procedure ==
This procedure describes the adjustmet of the receiver in the TouchLine display stations based on the Motorola 68HC05 microcontroller. The relevant boards are <br\> 1. A100C01340, used in the TouchLine 70013, 703x3 and the interguard 707x stations <br\> 2. A100C01425, used in the TouchLine 7042, 7043 and many custom design flush mounted stations
Necessary equipment to preform the adjustment:
Oscilloscope with 10M ohm probe with insulating transformer on the power supply<br\>An AlphaCom or a TouchLine with display capabilities.<br\>A screwdriver suitable for the potmeter's RP1 and PR2. <br\><br\> Connect the oscilloscope probe to pin 11 on U5 (this is the PLL, the 74HCT4046), and the oscilloscope ground to the B-wire close to the station (not more than 3 meters). Set scope to 1Volt/line vertical division and 2 usec/line horisontal division. Adjust RP1 and RP2 until the waveform it is as shown on the figure, be accurate! Disconnect the board and reconnect after 2-3 seconds. Dial 789 (on a TouchLine, the AlphaCom will initialise automatically after a while but the 789 will work here as well). The display should now reset. <br\> <br\> This waveforms are very probe dependent. You have to experience the centre of the tolerance area yourself. Pay special attention to the slopes and the second peek on the curve.