E.F. Johnson Company 7780 Series, Preliminary Service Manual

Page: 18 / 116

TRANSCEIVER OPERATION
2-4
November 1999
Part No. 001-7780-500
BUSY
- A busy system or transmit channel is being
detected by the Busy Channel Lockout feature (see
Section 2.4.5).
- The battery needs recharging (see Section
2.3.6).
- The keypad has been locked by pressing the
Keypad Lock option switch (see Section 2.3.5).
2.3 GENERAL OPERATION
2.3.1 INTRODUCTION
This section (2.3) describes features available
with both trunked and conventional operation. For
information on features unique to conventional chan-
nels, refer to Section 2.4, and for information on
features unique to SMARTNET/SmartZone channels,
refer to Section 2.5.
2.3.2 TURNING POWER ON AND SETTING
VOLUME
Power is turned on and off by the On-Off/Volume
switch on the top panel. When power is initially turned
on, an alert tone sounds and the radio software version
is momentarily displayed. If a SMARTNET/Smart-
Zone channel is selected, the zone alias is then
displayed followed by the unit ID (see page 13). The
selected channel is then indicated.
To turn power off, turn the On-Off/Volume knob
counterclockwise until a click occurs. The display may
remain on for a few seconds after power is turned off.
It is recommended that power not be turned back on
again until the display is blank.
The relative volume level can be determined by
noting the position of the index on the On-Off/Volume
knob. To enable a reference tone for setting the
volume, proceed as follows:
•
If key press tones are enabled (see Section 2.3.10),
a short tone sounds when front panel keys are
pressed.
•
If a conventional channel is selected and the
Monitor option switch is programmed (see Section
2.4.4), pressing that switch unsquelches/squelches
the receiver and either voice or background noise is
heard. If a SMARTNET/SmartZone channel is
selected, the receiver cannot be manually
unsquelched.
2.3.3 BACKLIGHT
The backlight for the display and keypad can be
manually turned on by pressing the Backlight option
switch if it is available. It can also be dealer
programmed to automatically turn on when any key is
pressed. It then automatically turns off after the
programmed delay so that battery drain is minimized.
2.3.4 OPTION SWITCHES
The programmable option switches are as
follows, and the programmable functions are shown in
Table 2-1.
•
F1, F2, F3
•
, # (full keypad 15-key models only)
•
AUX, FCN (on side)
If the radio is programmed with both conven-
tional and SMARTNET/SmartZone channels (see
Section 2.3.12), these option switches can control a
different set of functions for each channel type. For
example, the F1 switch could select Hi/Lo Power
when a conventional channel is selected and Private
Calls when a SMARTNET/SmartZone channel is
selected. If no option switch has been programmed to
control a particular function, that function may not be
available or may be in a fixed mode.
2.3.5 KEYPAD LOCK
If the Keypad Lock option switch has been
programmed, the keypad can be locked (disabled) to
prevent keys from being accidentally pressed. To lock
the keypad, press this switch and a locked keypad is
indicated by the
icon in the display. To unlock the
keypad again, press and hold the Keypad Lock switch
until a tone sounds (approximately 1 second). The
keypad can also be disabled by programming. It is
then permanently disabled and cannot be re-enabled
by the user.
*