Service Manual Part 1

  +8
  
+8/8" 7%&
When manual or automated test mode is engaged after logon, the radio will be in the
following state, where applicable to particular radio models. The numbers in brackets
refers to the test facility, as described in Table 5.1, “T2000 Test Facilities”.
• Synthesiser programmed to the last selected channel.
• Modem transmit off (13).
• Force receive audio muted if in transmit mode (20).
• Force receive audio unmuted if in receive mode (21).
• Microphone audio muted if in receive mode (22).
• Microphone audio unmuted if in transmit mode (23).
• Radio power amplifier enabled (31).
• Radio set to receive if PTT released on power-up (32).
• Radio set to transmit if PTT pressed at power-up (33).
• 13.8V switched supply on / ECN off (43).
• Radio not in state for current measurement test (45).
• Microprocessor clock rate set as programmed for the channel if in receive mode.
• Microprocessor clock rate ‘normal’ if in transmit mode (70).
• Radio transmit power set as programmed for the channel.
The behaviour of the front panel or control head digital display and/or LEDs is
described in Table 5.2, “Radio Mode/Status Display”.
+8/8+ 3#!
+8/8+8 
The radio may be reset at any time in any of the following ways:
• Switch the radio off then on again.
• Momentarily connect the microprocessor ‘reset’ pin to ground (pads are provided on
the enhanced control PCB).
• Send a reset command character (^) over the serial communications port (refer to
Table 5.1).
 The radio will not respond to the reset character after an EPROM or RAM test
failure.