SERVICING THE AT10.1
49
3.4. TROUBLESHOOTING CHART
SYMPTOM
PROBABLE
CAUSE
RECOMMENDED ACTION
Front panel
meter
displays all
segments
on
or all
segments
off
AT10.1 may
have no
output
1. An external
surge has
interrupted
operation of the
microprocessor
or the display
controller.
1A. Soft Reset of control board by pressing S7 reset switch.
S7 is located inside the AT10.1, on the control board’s right
edge (as viewed from the rear of the front panel). This will
restart the control board without modifying any settings.
1B. Hard Reset of control board by pressing and holding the
UP
button on the front instrument panel, and simultaneously
pressing S7 reset switch. This will restart the control board and
restore all settings to factory default. Reset parameters per
Section 2.3 of this manual.
1C. Remove all power from the AT10.1 to allow the control
board to discharge internal voltages. Open the ac input circuit
breaker (CB1) and disconnect all plugs on the Main Control
PC Board (A1). Keep power removed for approximately 5
minutes to allow voltages to discharge. Reconnect & restart.
AC breaker
(CB1) trips
(or fuses F1x
clear)
immediately
1. Shorted
rectifier diode
or SCR in
module
2. Defective
wiring to
transformer or
rectifier
3. Defective
transformer
1. Disconnect wire #
6
from the right-side SCR module (Q2),
or at the main power transformer (T1-X1). Measure the
resistance between the ac (bottom) terminals of the SCR
modules (Q1/Q2), checking both polarities. It should be at
least 100,000
Ω
. If resistance is low in either direction, replace
the rectifier module (Q1/Q2) as needed.
2. Check spacing of terminals. Check wiring for signs of
insulation damage, burns, etc. Repair as necessary.
3. Test by disconnecting wires from X1, X5, Y1 and Y2. If ac
breaker still trips, replace the transformer (T1).
AC breaker
(CB1) trips
(or fuses F1x
clear) after a
few minutes
1. Loose
connection to
breaker/fuse
2. Wrong ac
voltage, or T1
taps mis-wired
3. Open SCR
4. SCR not
controllable
1. Check and tighten connections as required.
2. Confirm the transformer primary taps (T1-H#) are wired
correctly for your ac input voltage supply. See Section 1.6 for
details.
3. Use a clamp-on ammeter to measure the current in wires
#
5
and #
6
(between the transformer and rectifier). If it less
than 50% of the dc output current, one of the SCRs or diodes
is defective. Replace rectifier modules (Q1/Q2) as needed.
4. Disconnect wires #
51/52
and #
53/54
from the SCR gate
lead terminals. These are the small gauge twisted pairs. Note
the original polarity so they can be replaced with the same
orientation. Restart the AT10.1. If you are able to measure
output current, one of the SCRs is defective. Test and replace
rectifier modules (Q1/Q2) as needed.
Summary of Contents for AT10.1 SERIES
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