Ericsson Base Station F800, Field Service Manual

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3 (5)
Uppgjord (även faktaansvarig om annan) -
Prepared (also subject responsible if other)
Nr -
No.
SES/KTR Mats Andersson KTR97:2486
Dokansv/Godk -
Doc respons/Approved
Kontr -
Checked
Datum -
Date
Rev File
KTR M. Andersson 1997-12-07 A
97-2486-FAULT TRACING F800.doc
3.3 NO MODULATION OR LOW MODULATION
Step Check Likely fault(s)
1 Connect the test handset to
the transceiver unit and
connect the RF test set to
the station’s antenna
output. Set up the test set
for transmitter testing. Set
the switches on the test
handset for internal audio
sources. Key the unit and
talk into the microphone. No or low modulation:
1. Transceiver unit
Normal modulation:
1. Line panel
2. Interconnection board
2 Check audio level on the
incoming line. Refer to
service manual for line
panel used. No or low line level:
1. Line problem
Normal line level:
1. Line panel
2. Interconnection board
3.4 NO OR LOW AUDIO SIGNAL FROM STATION
Step Check Likely fault(s)
1 Connect the test handset to
the transceiver unit and
connect the RF test set to
the station’s antenna
output. Set up the test set
for receiver testing. Set the
switches on the test
handset for internal audio
sources. Apply an on-
frequency signal to the
station and listen in the test
handset.. No or low audio level:
1. Transceiver unit
2. Line panel
3. Interconnection board
Normal audio level:
1. Line panel
2. Interconnection board
2 Check audio level on the
incoming line. Refer to
service manual for line
panel used. No or low line level:
1. Line panel
2. Interconnection board
Normal line level:
1. Line problem