Pub. 42004-658L2H
701-902 SmartSeries
®
Handset/Speaker Amplifier
Page 12 of 15
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-658L2H.docx
08/19
Fuses
There are three replaceable fuses (
F1
,
F2
, and
F3
) mounted on the speaker amplifier/power supply PCBA
•
Fuse
F1
protects the low voltage power supply circuits. Replace with GAI-Tronics part number
51801-027.
•
Fuse
F2
protects the current to the speaker amplifier. Replace with GAI-Tronics part number
51801-003.
•
Fuse
F3
limits the amount of current to any external device connected to
J2
. Replace with
GAI-Tronics part number 51801-024.
Troubleshooting
The following table lists some hints to aid technicians in troubleshooting.
Problem
Possible Solution
Any problem with station
performance
Remove the assembly from the enclosure and examine it carefully for
obvious faults such as unconnected plugs, loose connections where the
wires from the handset and hookswitch connect to the Handset/FSK/
P
PCBA, and so on. Determine whether the fault is in the assembly, or in
the system, by plugging in a known good spare assembly (set to the same
address as the assembly removed). If the fault is in the assembly, remove
it for repair.
N
OTE
:
When replacing the assembly, perform the following steps:
1.
Set the address on the new assembly to 0, 3.
2.
Plug the assembly into the enclosure.
3.
After about 10 seconds, remove the assembly. The station is now set
up to request a download of configuration variables from the MCU.
4.
Set the unit to the correct address. Set the address to 0, 4 for
conventional Page/Party operation or consult the ADVANCE system
manual for address assignment information.
5.
Plug the assembly back into the enclosure. The station initiates a
configuration download request (ADVANCE systems only). The time
required to complete the download depends upon system configuration
and system activity, but several seconds is typical.
Speaker volume needs
adjustment
Use the
USER
ADJ
control to adjust the minimum level, offset level, or
VLC level (as appropriate) (see the External Adjustments section).
Incoming handset speech
level needs adjustment
Use the
R
CVR
V
OL
control to adjust the handset receiver volume (see the
External Adjustments section).
Acoustic feedback or
speech distortion during
page or party operation
or
users hear themselves
when speaking
•
If the problem affects all stations, the line may not be terminated
correctly, may have loose connections, or a short to ground. Line
balance connections are critical.
•
If the problem affects only this assembly, the problem may be with its
sidetone setting. Contact GAI-Tronics’ Field Service Department.
