EST EST3X - 3-Zaxx Zoned Amplifier Modules Troubleshooting

Chapter 7: Service and troubleshooting
178 EST3X Technical Reference Manual
Problem
Possible cause
The
LEDs respond incorrectly • The control-display is not defined in the 3-SDU
• The control-display LED is not identified in the 3-SDU
• A rule governing LED operation is not correctly written
A b
utton does not perform the
expected function
• The control-display is not defined in the 3-SDU
• The button is not identified correctly in the 3-SDU
• A rule governing button operation is not correctly written
3-ZAxx zoned amplifier modules troubleshooting
Table 44: 3-ZAxx Zoned Audio Amplifier module troubleshooting
Problem
Possible cause
The a
udio output level is too
low
• A jumper is set for 25 VRMS but connection is to
a 70 VRMS
circuit
• The gain is set too low
• The auxiliary input level to the 3X-PMI is too low
There is n
o audio output or is
extremely low
• An open fuse needs replaced (not field replaceable)
• The gain is set too low
• The prerecorded message/tone is too low
• There is an incorrect channel activation
The a
udio output level is too
high
• A jumper is set for 70 VRMS but connection is to a
25 VRMS
circuit
• The gain is set too high
• The input level to the 3X-PMI is too high
The a
mplifier current is limiting • The audio circuit overloaded
• The input level to the 3X-PMI is too high
An i
ncorrect amplifier version
is
reported by the CPU
• The jumpers are installed incorrectly
• An incorrect model amplifier installed