Service manual

SECTION IV. PERFORMANCE CHECKS
7
A. Introduction to This Section
This section covers performance checks used to
verify the radio meets published specifications. The
recommended test equipment listed in the previous
section approaches the accuracy of the manufactur-
ing equipment, with a few exceptions. Accuracy of the
equipment must be maintained in compliance with the
manufacturer’s recommended calibration schedule.
B. Setup
Supply voltage can be connected from the battery
eliminator. The equipment required for alignment pro-
cedures is connected as shown in the “Radio
Alignment Test Setup” diagram.
Initial equipment control settings should be as
indicated in the following table, and should hold for all
alignment procedures except as noted in Table 5.
Table 5. Initial Equipment Control Settings
C. Test Mode
1. RF Test Mode
When the ASTRO Digital SABER radio is operat-
ing in its normal environment, the radio's
microcomputer controls the RF channel selection,
transmitter key-up, and receiver muting. Howev-
er, when the unit is on the bench for testing,
alignment, or repair, it is removed from its normal
environment. It cannot receive commands from
its system and, therefore, the internal microcom-
puter will not key the transmitter nor unmute the
receiver. This prevents the use of normal tune-up
procedures. To solve this problem a special rou-
tine, called TEST MODE or “air test,” has been
incorporated in the radio.
To enter the test mode:
a. Turn the radio on and adjust the volume for a
comfortable llistening level. The volume level
remains constant once in the test mode.
b. Within 10 seconds after the “Self Test” is
complete, press side button 3 five times in
succession.
c. After “RF TEST” appears, press the top pro-
grammable button (normally programmed as
the emergency button) once. “1 CSQ”
appears, indicating: test frequency 1, carrier
squelch mode.
d. Each additional press of side button 3 will
advance to the next test channel. (Refer to
Table 7.)
e. Pressing side button 2 will scroll through
and access test environments as shown in
Table 6.
NOTE
Transmit into a load when keying a radio
under test.
Table 6. Test Environments
2. Control Top and Keypad Test Mode
To check the display, the buttons, and the switch-
es, perform the following tests:
a. Turn the radio on and adjust the volume for a
comfortable llistening level. The volume level
remains constant once in the test mode.
b. Within 10 seconds after the “Self Test” is
complete, press side button 3 five times in
succession.
c. After “RF TEST” appears on the display,
press side button 1 once, “CH TEST”
(14-character radio) appears on the display.
d. Next, press and hold the top programmable
button; all segments on the display will light,
and the LED on the control top will illuminate
a red color.
e. Release the top programmable button; “3/0”
appears, which indicates that the top pro-
grammable button is in the open condition.
Monitor Mode: Pwr Mon Spkr set: A Voltage: 7.5Vdc
RF Attn: –70dB Spkr/load: DC on/standby:
Speaker Standby
AM, CW, FM: FM PTT: OFF Volt Range: 10Vdc
(center)
O'scope Source: Mod Current: 2.5Amps
O'scope Horiz: 10mSec/Div
O'scope Vert: 2.5kHz/Div
O'scope Trig: Auto
Monitor Image: Hi
Monitor BW: Nar
Monitor Squelch: mid CW
Monitor Vol: 1/4 CW
CSQ Carrier Squelch RX:unsquelch if carrier detected
TX:mic audio
TPL Tone RX:unsquelch if carrier and tone
Private-Line (192.8 Hz) detected
TX:mic audio + tone (192.8 Hz)
AST ASTRO RX:none
TX:1200Hz tone
*
System Analyzer Test Set Power Supply
Display Description Function
*
All deviation values are based on deviation tuning of this mode.