PT6808 Service Manual
but the radio displays NULL
NUMBER.
10
The radio frequently
switches from trunking mode
to conventional mode.
A. Please check if the radio has set the function of “entering to
conventional mode if cannot find the control channel” and
“searching control channel automatically under conventional
mode”.
B. Please prolong the delay time or cancel this function.
11 The keypad is unable to use.
A. Please check if the radio enables Keypad Lock function.
12
No power-on alert tone or
message alert tone.
A. Please check if the radio enables Mute function or the volume
adjusts to 0.
13 No signal strength indication.
A. Please check if signal strength indication is disabled.
2. Hardware problems
No.
Problem
Causes and Solutions
1
No display when powering
on.
A. LCD is broken. Please change a new one.
B. IC19CPU is broken. Please rejoint it.
2
There is no voltage input. A. C249 is not jointed well. Please rejoint it.
B. Buffer amplifier Q33 is broken. Please change it.
3
There is black spot on the
LCD.
A. LCD is broken. Please change it.
4
The backlight is not on.
The backlight is broken. Please change it.