User's Manual Part 2
Table Of Contents
- Maintenance
- Introduction
- Scheduled Maintenance
- Unscheduled Maintenance
- Introduction
- Tools, Materials and Test Equipment Required
- T6T VHF Amplifier Procedures
- Top and Bottom Covers
- Removing and Refitting the Interface Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Power Supply Modules
- Removing and Refitting the Combiner BIT Module
- Removing and Refitting the PA Modules
- Removing and Refitting the Front Panel PCB
- Removing and Refitting the Cooling Fans
- T6T VHF Drive Assembly Procedures
- Removing the Top Cover
- Removing and Refitting the Processor Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Drive Module
- Removing the Bottom Cover
- Removing and Refitting the PA Control Module
- Removing and Refitting the Power Supply
- Removing and Refitting the Front Panel PCB
- Virtual Front Panel (VFP)
T6T 300 Watt VHF Transmitter Page 100 Maintenance
Scheduled Maintenance
Park Air recommends that scheduled maintenance is carried out at twelve-monthly intervals. Scheduled
maintenance comprises the following checks:
Cleaning and Checking Security of Connectors
Remove all dust and dirt from the equipment exterior using a lint-free cloth and camel hair brush. Check
all external connections are secure and free from damage.
Setting the Transmitter Internal Reference Frequency
To set the transmitter internal reference frequency, use the following procedure. Note that references to
the switch in the procedure mean the Scroll/Select switch.
(6) Turn the switch clockwise until Exit is highlighted, then press the switch. You are returned to the
Main screen.
(7) Disconnect the frequency counter.
(8) If 5-offset carrier operation is required, complete the procedure Setting a 5-Offset Carrier
Frequency on page 101.
Number Check Tools/Test Equipment Required
1 Ensure the equipment is clean and that external
connectors are securely fitted.
Camel hair brush/clean lint-free
cloths.
2 Check and reset (if required) the transmitter’s
internal frequency reference.
VHF frequency counter.
3 Perform a BIT interruptive test.
4 Perform an ac and dc change-over check (if both
supplies are connected).
Control Screen
Settings Screen
F r e q u e n c y
C h a n n e l
S e t t i n g s
E x i t
B a n d E d g e s
R e f F r e q 5 0 . 0 %
B a c k l i g h t 0 3 0 s
E x i t < < > >
(1) If the transmitter operates with 5-offset
carrier (that is, set with a 4 kHz or 8 kHz
offset) reset the offset to zero.
(2) Connect a frequency counter to the front
panel Reference connector.
(3) From the Main screen, press the switch to
display the Control screen. Turn the
switch until Settings is highlighted. Press
the switch.
(4) Ensure the Settings screen is displayed.
Turn the switch until Ref Freq is
highlighted, then press the switch.
(5) With Ref Freq selected turn the switch
clockwise or anti-clockwise until the
frequency counter reads 20.950000 MHz
±10 Hz, then press the switch.