EFJohnson 764X, 761X service manual Direct Selection The F1-F4

OPERATION

then ready to be used. To turn power off, press and hold the POWER switch until power turns off.

3.3.2 ENTERING A PASSWORD

The transceiver may be programmed so that a password must be entered before the transceiver can be used. When power is then turned on, “PWORD” is displayed and the four-digit passcode must be entered. This code is entered using the F1-F4 and channel

down ( ) keys. The number entered by each key is as follows. The numbers in a block are detected as the

Key	F1	F2	F3	F4
Number	0	1	2	3	4
Entered	5	6	7	8	9

same. For example, “1234” is the same as “6789”. If the “PWORD” indication does not turn off after enter- ing four digits, you may have entered an incorrect number. Cycle transceiver power and try again.

3.3.3 VOLUME LEVEL ADJUSTMENT

The volume can be adjusted in up to 32 steps by

pressing the volume up/down keys ( ). A graph in the alphanumeric display indicates the current volume level. If equipped with a MONI option switch,

you may be able to press (or press and hold) that switch to enable audio for use as a reference level.

The minimum selectable volume level can be set by the power-on menu described in Section 3.3.4. Select this mode and then press F1 to display “AFMIN”. Then press the volume up/down keys to select the desired minimum level. The current level is indicated by the bar graph, or receiver noise can be enabled as described in Section 3.3.6.

3.3.4 POWER-ON MENU

The power-on menu is a special menu that can be selected at power on to control various functions. Proceed as follows:

1.Select the power-on menu by turning power on with

the up and down keys pressed.

2.The F1-F4 keys now control the following func- tions. Press the switch once to select the function

and then again to return to the normal channel display.

F1 - Minimum volume level (see Section 3.3.3)

F2 - Key beep on-off (see Section 3.5.4)

F3 - Backlight on-off (see Section 3.5.2

F4 - Squelch adjust (see description which follows)

3.To return the F1-F4 keys to the programmed func- tions, turn transceiver power off and on again with-

out pressed.

3.3.5 CHANNEL SELECTION

Channel Scrolling - If the keys are pro- grammed as CH UP or CH DN keys, they can be pressed to scroll up or down through the programmed channels.

Direct Selection - The F1-F4 and keys can

be programmed to directly select a specific channel. These keys are then labeled CH 1 to CH 4 .

3.3.6 ADJUSTING SQUELCH LEVEL

The squelch level is adjusted by programming or selecting the power-on menu just described. Proceed as follows to use the power-on menu:

1.Select a non-busy channel. Then select the power-

on menu by turning power on with the up and down

keys pressed.

2.Press the F4 option key to select the squelch adjust mode indicated by “SQ xx”.

3.Press the down key until noise is heard from the speaker (adjust the volume if necessary). Then

press the up key until the noise just mutes (the “SQ xx” number indicates the relative squelch level).

4.Reselect normal operation by turning power off and on without the up and down keys pressed.

NOTE: If weak messages are not heard or unsquelch- ing occurs when no messages are present, slight read- justment up or down may be required.

	November 1998
3-3	Part No. 001-7600-001