Glenayre Document Number: 9110.00148
RL-903 Receiver
Issue 1, Rev.
C:
12/10/96
CHECKOUT AND TROUBLESHOOTING
Refer to the system manual to isolate a fault to a piece of equipment. Use this section to
isolate a fault to an assembly. If the receiver does not function correctly, perform the proce-
dures listed in this section to determine the problem. Keeping records of performance of
this receiver is helpful. Use Table 2-1, Specifications, to determine the expected sensitivity
of the receiver. Refer to Figure 3-3, Top View of Internal Assemblies, to locate the
assemblies.
8.1
Power Supply (PS/A board unless noted)
Check power supply output and delivery to pc assemblies in this procedure.
Figure 7-6, PS/A Board Controls and Indicators, provides a view of the pc board.
Dc Power Checks
1.
Check that input power (28 Vdc or within range of specifications) is supplied to rear-
mounted TB 1.
2.
Turn on front-panel power switch. Front-panel POWER LED IF board D21 should
light.
3.
Check that fuse is okay.
4.
Check voltage at TP2. Voltage should be 14.5 to 15.5 Vdc.
5.
Check voltage at TP1. Voltage should be 11.5 to 12.5 Vdc.
6.
Refer to Figure 7-5. Check voltage at IF-board P7-1 and -2. Level should be same as
in previous step.
7.
Refer to Figure 7-1. Check voltage at VCO-board U10-output (U10 is next to refer-
ence assembly U11; output is at leg toward corner). Level should be 4.75 to 5.25 Vdc.
8.2
Audio (IF board unless noted)
This procedure verifies that the audio section is functioning properly. Refer to Figure 7-5,
IF Board Controls and Indicators.
Audio Checks
Verify that the audio section is working in order to more easily troubleshoot RF and IF
problems.
1.
Set SQUELCH switch S2 to TEST. Be sure that SQUELCH LED D14 is lit, indicat-
ing open squelch.
2.
Apply standard test signal to receiver. Note that RSSI voltage at J1-12 (TB3-5) can
indicate status of RF and IF stage even if audio section is not functioning.
3.
Verify that installation of jumpers is correct. Refer to Table 7-7, IF Board Controls
and Indicators. Be sure that R51 is not turned completely down.
4.
If receiver uses tone board, temporarily disable tone board path by setting JR7/JR8 to
JR8.
Print Date: 12/05/96
Copyright © 1996 Glenayre
Page: 8-1