Ericsson LBI-38953 Maintenance Manual page 14

LBI-38953
Relay Switch (FCN 1 8)
The FCN 1 8 function displays [RELYTOGL] and is
used to toggle the relay (ext. alarm) line at a 1000 Hz rate for
board level testing.
Any key causes reset to default conditions.
Port Pin Check (FCN 1 9)
The FCN 1 9 function displays [PORTTOGL] and is
used to do a board level test operation of the microprocessor
port pins. The port pins will toggle at the rates indicated in
Table 2.
Table 2 - Port/Pin Identification
U701
2
3
4
5
6
7
8
9
14
15
Software Revision (FCN 2 0)
The FCN 2 0 test displays the microprocessor software
revision. [MDR GRxx] where xx is the revision number in
decimal format (i.e. 31 = 3.1)
Band Switch (Direct Mode) (FCN 2 1)
The FCN 2 1 test displays [BSWCH-0] then pulls the
bandswitch line of the VCO low. A talk around channel
(3610-4808) must be loaded using the channel load function
(CLR). RCL must be pressed to reset the Bandswitch Line.
Normal channels must then be loaded before the synthesizer
will lock on channel.
14
NOTE
RATE
20 Hz
10 kHz
5 Hz
2.5 kHz
1250 Hz
625 Hz
312 Hz
156 Hz
78 Hz
39 Hz
CAUTION
The radio must be equipped with the Talk-Around
option for proper direct mode function. Performing
direct mode tests on a radio that is not equipped with
the Talk-Around transmit option may damage the
radio.
Checksum Test (FCN 2 2)
The FCN 2 2 test performs a checksum test on the
program memory. [PROM BAD] is displayed if the check
sum fails. [PROM OK] is displayed if the test is successful.
TCXO Low Frequency Modulation Test
(FCN 2 3)
The FCN 2 3 function checks the lock detect line of the
synthesizer and displays [UNLOCK] if the synthesizer is out
of lock. Otherwise the radio displays [DCG ENC], keys the
transmitter (even if an "unlock" condition exists) and con-
tinuously transmits a 10 Hz square wave useful in setting the
low frequency compensation level to the TXCO (R250). Mic
audio is also present. Preswsing any key unkeys the trans-
mitter.
Handset Self-Test (FCN 2 4)
The FCN 2 4 test sends a command to the handset to
cause it to go into the self-test mode. The handset will display
[SELFTEST] then [RAM PASS] or [RAM FAIL] and then
begin a pixel test of the multiplexed display. A test of the
backlight [LITE ON] then [LITE OFF] will be performed.
The call timer will begin running i.e. [000 00 0]. At this time
the handset will display the name of any key (execpt END)
that is pushed, eg. [KEY 4] indicates key 4 is pushed, [KEY
STO] indicates the STO key is pressed, etc. Pushing the END
key will terminate the self test. At this time [FSxx #01] will
be displayed and the handset will return to test mode opera-
tion.
Tone Channel Guard Encode (FCN 2 5)
The FCN 2 5 function checks the lock detect line of the
synthesizer and displays [UNLOCK] if the synthesizer is out
of lock. Otherwise the radio displays [CG ENC], keys the
transmitter (even if an "unlock" condition exists) and con-
tinuously transmits 150 Hz Channel Guard combined with
mic audio. Pressing any key unkeys the transmitter.