Transceiver Fault Isolation Chart; Basic Voltage Test Procedure - Honeywell XK516D1 Maintenance Manual

ment voltages are checked and branched to the fault isolation procedures for the Power Sup-
ply and/or Controller D and Interface D modules.
STEP PROCEDURE
1.0 INITIAL CONDITIONS
Connect Transceiver per test setup procedure (Fig. 101).
Conduct each of the following tests with power supply switch
set to both UNSWITCHED and SWITCHED positions.
2.0

BASIC VOLTAGE TEST PROCEDURE

2.1 +5V voltage; measure with DMM at test
point TP-4G
2.2 +15V voltage; measure with DMM at test
point TP-4D
2.3 –15V voltage; measure with DMM at test
point TP-4F
2.4 +28V voltage; measure with DMM at test
point TP-4C
2.5 +50V voltage; measure with DMM at V50
(Amplifier Board, A31).
Receive mode:
Transmit mode:
3.0 TEST RESULT
In the event of a fault, continue according
to Transceiver troubleshooting chart (Fig.
131)
G . Transceiver Fault Isolation Chart
A typical fault isolation sequence is shown in the Transceiver Fault Isolation Chart of Fig. 118.
The chart details the various possible test and analysis stages up to the fault isolation proc-
dure of the defective assembly. In addition, a list is provided of the applicable schematic dia-
grams and functional descriptions.
In the fault isolation chart, it is assumed that the Transceiver is on the test bench. The anal-
ysis of the BITE results is the primary objective of the isolation procedure. In the event of a
BITE evaluation being impossible due to a major fault (Processor, Power Supply, ARINC bus
failure), options are to perform the manual test initiation with front panel LED display, or to
perform the full Transceiver Return-to-Service ATP (Ref. paragraph H).
The BITE system permits the display of faults that have occurred, also during previous flight
legs, on the basis of data stored in in the fault memory. These faults are stored together with
supplementary information in the memory and can be displayed with the aid of the various
BITE menus as described in paragraph D.
I.B.1516A
Honeywell
COMPONENT MAINTENANCE MANUAL
PART NUMBER 964-0452
Basic Voltage Test
Figure 117
23-12-01
RESULTS COMMENTS
+5.3V + -0.3V Failure: step 3.0
+15V + -1.0V Failure: step 3.0
-15V + -1.0V Failure: step 3.0
+28V + -3V Failure: step 3.0
+58V + 4V Failure: fault isolation procedure
+50V ± 4V Power Amplifier, A3
Failure: check ON/OFF Board,
A15, fault isolation procedure
Power Supply, A4.
No Failure: fault isolation proce-
dure Controller D, A8, and Inter-
face D, A9
Page 122.6
Oct 25/02