Field Adjustment; Circuit Board Replacement - jotron WP 900 Manual Del Usuario

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Installation Guide
H/U952T Terminal Transmitter
5.1
6

Circuit Board Replacement

2002-11-13/ Rev. A
3 Energize all units in the 900-system. Function indicator LED100 on the transmitter
should light red for about 1 second and then change to a flashing green.
If it continues to indicate steady red, check that supply voltage is 12.5 Vdc ± 10%.
Flashing red indicates a program fault, parameter fault, or a faulty 125 MHz
oscillator.
4 If H/U952T is connected to another unit, the indicator should show a steady green
indication within 90 seconds.
If the indicator continues to blink green, check:
• Polarity of data bus(es)
• Connections on H/U952T
• That H/U952T is properly addressed
• That all sections of SW200 is set to OFF
If everything seems to be OK but the function indicator still blinks, the fault is
probably located outside H/U952T:
Check the other 900-units according to the System Installation document, or
contact your dealer.
5 If T952SM/FL module is used:
• Check that T938RM is connected as a reference module if the transmitter is
included in a frequency locked system.
• When frequency locking is used it should be locked to a reference frequency
within 20 seconds, the indicator on the T952SM/FL module is lit red.
• Perform a speech test.
6 Initiate a paging from a unit. The LEDs TX ON and DATA ON lights momentarily,
about 2.5 sec. If not, contact your dealer.
7 Replace the cover.
When all other units are installed, perform the system check described in the System
Installation document.

Field Adjustment

Reference frequency, VCO frequency and output power are all factory-set. If adjustments
are to be done, see Repair Manual H/U952T Transmitter, TD 92023GB, in chapter
Alignment and Adjustment.
1 Disconnect the power supply.
2 Remove the antenna coax.
3 Release the cover, see figure 4 on page 4.
TD 92022GB
9