User's Manual

PINEAPPLE TECHNOLOGY, INC.
DTC25U Operating and Service Manual
IX -- PROBLEM SOLVING/TROUBLE SHOOTING
IX - PROBLEM SOLVING & TROUBLE SHOOTING
(
Pa
g
e 1of 2
)
The DTC25U is a "MODULAR ASSEMBLY" where most of the sub-assemblies can be
removed and or re
p
laced as necessar
y
as necessar
y
to maintain full service. To service this transmitter,
it is best to become familiar with the various sub-assemblies b
y
reviewin
g
the transmitter block dia
g
ram
and it's associated subs shown in the introduction. An
y
work
p
erformed on a transmitter licensed b
y
the FCC must be
p
erformed b
y
q
ualified
p
ersonnel.
FAILURE ANALYSIS STARTS WITH THE FOLLOWING ASSUMPTIONS:
1. The transmitter is connected to an AC source which is within the s
p
ecified volta
g
e ran
g
e
and has am
p
le
p
ower to run the transmitter.
2. The antenna has been checked out and a
p
ro
p
er match has been verified.
3. The room tem
p
erature is < +35 de
g
rees Celsius
(
+95 de
g
rees Fahrenheit
)
4. There are no restrictions in the air flow in or out of the buildin
g
.
5. The video and aural si
g
nals to the modulator com
p
l
y
with stated s
p
ecifications.
CHECKING THE WARNING LIGHTS
There are several warnin
g
si
g
nals visible on the front of the transmitter that will alert the technician
of
p
ossible
p
roblems. When viewed from the front, all the li
g
hts should be GREEN indicatin
g
normal
o
p
eration. An alert si
g
nal is indicated b
y
a RED li
g
ht. We will focus on RED alert si
g
nals in this section
.
LTX Mainframe Assembl
y
FAN FAULT RED indicates that the fuse su
pp
l
y
in
g
AC to the fan has failed. The fus
e
is located
j
ust inside the front
p
anel near the to
p
. See Fi
g
. 1 for location.
CHECK: FUSE AND/OR FAN
Fi
g
. 1
Page 18