Service manual

June 21,2004 2-9
NP88 FLEX DECODER
Troubleshooting
No Audible Alert
Ensure the following before initiating this troubleshooting procedure:
a. Verify the pager is in the audio mode and not in the silent alert mode
(check for the speaker icon).
b. Check the options set with the Pager Programming Software to ensure
the “Completely Silent” pager option is not set.
c. Verify the transducer contacts a re okay.
Figure 2-9. No Audible Alert Troubleshooting Flowchart,
FLEX Decoder
FAIL
FAIL
FAIL
NO AUDIBLE ALERT
CHECK WAVEFORM AT
U1 PIN 58
FAIL
REPLACE SUPPORT MODULE
CHECK SIGNAL AT BU1
OK
OK
= 1.3V P-P AT 2731Hz
REPLACE BU1
REPLACE DECODER
BOARD
FAIL
AND RE-TEST
REPLACE Q2, R11
AND RE-TEST