User Manual

PINEAPPLE TECHNOLOGY, INC. IX--PROBLEM SOLVING AND TROUBLESHOOTING
DTXPRO-1.2KU OPERATING AND SERVICE MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
IX - 2
IX - PROBLEM SOLVING AND TROUBLE SHOOTING
The DTXPRO-1.2KU is a "MODULAR ASSEMBLY" where most of the sub-assemblies can be
removed and or replaced as necessary to maintain full service. To service this transmitter, it is
best to become familiar with the various sub-assemblies by reviewing the transmitter block
diagram and its associated subs shown in the introduction. Any work performed on a transmitter
licensed by the FCC must be performed by qualified personnel.
FAILURE ANALYSIS STARTS WITH THE FOLLOWING ASSUMPTIONS:
1. The transmitter is connected to an AC source which is within the specified voltage range
and has ample power to run the transmitter.
2. The antenna has been checked out and a proper match has been verified.
3. The room temperature is < +35 degrees Celsius (+95 degrees Fahrenheit)
4. There are no restrictions in the air flow in or out of the building.
5. The video and aural signals to the modulator comply with stated specifications.
CHECKING THE WARNING LIGHTS
There are several warning signals visible on the front of the transmitter that will alert the
technician of possible problems. When viewed from the front, all the lights should be GREEN
indicating normal operation. An alert signal is indicated by a RED light. We will focus on RED
alert signals in this section.
MFA2PA ASSEMBLY
FAN FAULT RED indicates that the fuse supplying AC to the fan has failed. The fuses
located just inside the front panel near the top.
CHECK: FUSE AND/OR FAN
DC SUPPLY RED indicates a loss of +50 VDC to PA
CHECK: DC supply voltage to the rear of the PA1K-50
CHECK: DC supply fuse located on the Fuse panel located at the bottom of the
rack in the rear.
CHECK: AUX panel location in the bottom half of the rack being checked for
proper voltage and current readings
NOTE: If all the ALERT lights are on in a given rack, this could indicate that a
breaker has tripped.
CHECK: Circuit breakers located on the front of the ACDIS2 or the sub-panel
breaker located at the MAIN AC supply.