Tegam R1M-A - Table 2: Fault Symptoms and Repair Actions

Revised August, 2004
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5-5
MAINTENANCE
SYMPTOM
FAULTY
COMPONENT
REPAIR
No Display
Line Power
Line Fuse
TEST pushbutton
U5/U6
T1, D9 & 12, or
U7
T1, D10 & 11, or
U8
U4 or U5
Check power cord & power.
Check fuse.
Depress the TEST
pushbutton and see if the
LED comes on.
If so, check for a square
wave at pin 40 of U4 and/or
replace U5/U6.
If not, check for proper
power supply voltages and
check or replace fuse.
Check for +6 V. If not, trace
& replace bad part.
Check for -6 V. If not trace &
replace bad part.
Replace U4 or U5.
No Test Voltage
T1
D7, 8
C23, 24
R37
Check for 360 VAC pins 7-8.
Replace D7, 8.
Replace C23, 24.
Replace R37.
1 MΩ Range not
Accurate
R21
Replace R21.
10 MΩ Range not
Accurate
R20
Replace R20.
100 MΩ Range
not Accurate
R19
Replace R19.
1 GΩ Range not
Accurate
R18
Replace R18.
10 GΩ Range not
Accurate
R17
Replace R17.
100 GΩ Range
not Accurate
R16
Replace R16.
Error with some
test voltages
U1, S1, R22-25
Replace bad part.
All Ohm readings
too high or too
low
R14 Adjustment
Adjust R14.
Table 2: Fault Symptoms and Repair Actions
After trouble-shooting and repair, the instrument must be
recalibrated in accordance with 5.5 above.