Top Fault Finding - Tait TOP Operation And Service Manual

3.7

.TOP Fault Finding

Diagnosis TIP
If unsure whether a radio with simple inversion encryption is in encrypt or clear mode: while in standby
(without any incoming signal), hit a keypad or function key to produce an audible beep. If the radio is in
encrypt mode, the beep will be a much higher frequency than normal.
Symptom
Radio transmits regularly -goes
into emergency mode
Audio not operating
Radio stopped working after it
was dropped.
Receives okay, but no transmit
audio.
External mic PTT does not
operate.
Encryption on/off button only
changes encryption state every
second press
Module does not decrypt audio.
Radio will not power up
properly, shows database error,
continuous Red LED.
Radio will not power up
properly, display blank.
Radio set to one code can hear
another radio no matter what
code it is set to.
Audio sounds very muffled
Audio sounds very "thin".
Audio sounds unusually high
pitched or low pitched.
Receiving radio intermittently
fails to decode sync pulse.
Audio unintelligible for several
seconds then comes right.
Radio confidence and alert tones
are different, rapidly varying
tones.
Radio makes unusual, distorted
beeps at turn on.
Encryption indicator triangle
turns on and off randomly.
34 Tait Orca Portable (TOP) Encryption
Cause
Module not squarely in connector
Module may not be receiving PTT
Incorrect links on flex
Module may be programmed for level-sensitive
instead of edge-sensitive.
Module may have been programmed differently
to the rest of the fleet.
Radio has been downloaded with incorrect
firmware and/or programmed with
incompatible software.
Flex-edge connectors may not be correctly
plugged.
Module faulty.
Module may have same code strings set in all
code registers.
IC1 on flex may not be working, or not getting
address information from micro.
Inversion module may have very low inversion
frequency.
Inversion module may have very high inversion
frequency.
Transmit and receive inversion frequencies may
be different.
System delay may be set too short
Normal when the transmitting or receiving radio
creates an alert tone or confidence tone during
an encrypted conversation.
Radio confidence tones may be set to high. (Not
all radios exhibit this)
Both LK-3 links on TOP flex may be connected,
not just one.
Action
Re-plug connector to
module (radio will need to
be opened)
Check PTT links.
Check PTT links.
Reprogram encryption
module.
Reprogram correct settings.
Contact Customer support.
Replug connectors checking
that the flex is square to
connector.
Replace module.
Reprogram module with
different codes.
Replug loom connectors,
check circuit.
Program module to a higher
frequency.
Program module to a lower
frequency.
Ensure both radios are using
same frequency. If problem
still exists, reprogram
module
Reprogram module, or
consider if CTCSS can be
removed from some parts
of radio system.
No action - not a fault
Reprogram radio to set
confidence tones to low.
Remove one LK-3 link. (See
Fitting Instructions)
Midian Encryption Programming and Service Manual
June 2006 © Tait Electronics Limited