View source for Display data receiver adjustment procedure for TouchLine stations

== TouchLine station display data receiver adjustment procedure == 
[[Image: 1425.jpg|right|200px|thumb|Component location A100C01425]]
[[Image: 1340.jpg|right|200px|thumb|Component location A100C01340]]
[[Image: 7007 DisplayAdjust.PNG|right|200px|thumb|Component location A100C07844]]
This procedure describes the adjustment of the receiver in the TouchLine display stations based on the Motorola 68HC05 microcontroller. The relevant boards are:
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# A100C01340, used in the TouchLine 10070013xx, 100703x3xx and the interguard 100707xxxx stations
# A100C01425, used in the TouchLine 1007042000, 1007043000 and many custom design flush mounted stations
# A100C07844, used in the DualDisplay station 1007007000
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=== Necessary equipment to preform the adjustment: ===
[[Image: Display data receiver adjustment procedure for CRM-IV2.jpg|left|200px|thumb|Oscilloscope wave form]]
- Oscilloscope with 10M ohm probe with insulating transformer on the power supply 
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- An AlphaCom exchange. 
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- A screwdriver suitable for the potmeter's RP1 and PR2.
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* - Adjust RP1 and RP2 to approx. 75 kohm
* - Connect the oscilloscope probe to pin 11 on the PLL 74HCT4046, This is IC U5 on the A100C01340 and A100C01425, and IC U3 on A100C07844. 
* - Connect 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. The display should now reset.
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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.

[[Image:Picture3 Good adj of RP2.jpg|thumb|350px|left|Good adjustment]]
[[Image:Picture2 Not good adj of RP2.jpg|thumb|350px|left|Bad adjustment]]

[[Category: Station Troubleshooting]]
[[Category: Analogue Station - Technical articles]]