If a timing error or variation persists after all the suspected causes of error have
been eliminated, then it is possible that the Binary Input circuit is malfunctioning.
Contact factory for return instructions.
6.3.1.5 Voltage/Current Amplifier Module
It is usually recommended that the complete Voltage/Current Amplifier Module assembly
be returned for factory repair if found to be defective. Then any improvements that have
been made can be incorporated into it during repair and servicing. Due to the extensive
use of Surface Mount Technology in the amplifier module, there is very little that can be
repaired without special tools and training. Some basic troubleshooting can pinpoint
problems to the approximate cause.
Basic troubleshooting is as follows:
1.
Voltage Module, no output when the MPRT is energized:
Voltage Amplifier Module power supply failure or loose interface connections.
CAUTION: Turn off main power and unplug line cord before attempting to
reseat any module.
Check for proper input voltage. Check VI-Gen Amplifier Module; make sure it is
properly seated into the back plane connector. See instruction under section
6.2.1.3 Input Power and Control
for reseating the VI-Gen module. After
reseating the output module, and reinstalling the cooling fan assembly, reconnect
the power cord and power up the unit. Manually turn outputs on and check for
proper output. If output does not change, peer through the air intake slots on the
top to observe the VI-Gen LED’s. Each module has some LED’s that stay on
continuously and some that blink. If there are no blinking LED’s on one or more
modules, then the module is not communicating with the operating system.
Replace the VI-Gen Module.
2.
DC voltage output with amplifier turned off:
It is normal to have a few millivolts of dc voltage with the output switched off,
since the amplifier is dc coupled. However, if the power supply starts to fail, the
operator may measure 10's of volts dc across the output binding post. This is an
indication that the power supply has a problem and needs to be replaced.
Contact factory for return instructions.
4.
Removal of Voltage / Current (VI Gen) Amplifier Module
Note: Before removing the VI-Gen module, with the unit powered up, use the TVI
and press the System Config button, then press the About button. Write down the
Software Version numbers, and Serial Numbers of the associated V/I Gen #’s
(you will need this information later). To remove the module from the chassis,
A.
Disconnect the power cord from the unit.
B.
Carefully remove the cooling fan assembly located in the back of the
unit. Note two captive screws at the lower bottom are flat head screws,
the other four screws located across the top are Phillip head screws.
C.
Remove the two retaining screws located on the back of the VI Gen.
D.
Grasp the back the Module with one hand and gently, yet firmly, pull the
module from the unit.
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