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TM 55-4920-412-13&P
f: Turbine Gas Temp NO 1 and NO 2.
(1)
Connect Digital multimeter to connector NO 1
pin L (Hl) and M (LOW), using two leads.
(2)
Set TURBINE GAS TEMP NO 1 CAL/NOR
switch to CAL, HI/LO switch to HI and variable control
fully CW.
(3)
Set ON-OFF-SIM ONLY switch to SIM ONLY.
Digital multimeter will indicate between +33.69 and
+33.89 mvdc. If not, perform Troubleshooting Table 4-9.
(4)
Set TURBINE GAS TEMP NO 1 HILO switch to
LO. Digital multimeter will indicate between -0.1 and
+0.1 mvdc. If not, perform Troubleshooting Table 4-9.
(5)
TURBINE GAS TEMP NO 1 CAL/NOR switch to
1 NOR and adjust variable control fully CCW. Digital
multimeter
will indicate between -0.5 and +0.5 mvdc. If not, perform
Troubleshooting Table 4-9.
(6)
Adjust variable control fully CW. Digital
multimeter will indicate between +41.30 and +51.30
mvdc. If not, perform Troubleshooting Table 4-9.
(7)
Set ON-OFF-SIM ONLY switch to OFF.
(8)
Disconnect leads from connector NO 1 pins L
(HI) and M (LOW) and connect to connector NO 2 pins L
(HI) and M (LOW).
(9)
Repeat (2) through (7) above, except use
TURBINE GAS TEMP NO 2 controls.
Table 4-9. Troubleshooting Turbine Gas Temp NO 1 or NO 2 (AVIM)
NOTE
Before performing troubleshooting, remove DC simulator A4 board and reconnect
using extender board.
Trouble
Probable Cause
Remedy
No HI-CAL voltage
NO 1 - (CR2),T3,(U2)
First check loops 56(+) and 58(-)
NO 2 - (CR3),T3,(U3) associated
NO 1 for input 15 vac ±.5 vac and loops
resistors and capacitors
27(+) and 30(-) NO 2 for 15 vac .5
NO 1 - TGT-U1
vac. Check T3 if no voltage. Replace
NO 2 - TGT-U2
defective components, Figure 4-6, 4-7,
FO-2, FO-5, or replace A4 board.
HI-CAL VOLTAGE
NO 1 - (R13)
Use decade resistor box, and check or
Indication out of tolerance
NO 2 - (R20)
replace malfunctioning components,
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
HI-CAL VOLTAGE
NO 1 - (R54) or (R10)(U1)
If trim resistors do not bring reading
Indication out of tolerance
NO 2 - (R53)(R17) or (U3)
in tolerance replace malfunctioning
after trim resistors checked or
components, Figures 4-6, 4-7, FO-2,
replaced (R13) or (R20)
FO-5 or replace A4 board.
LO-CAL VOLTAGE
NO 1 - (S30)
Replace malfunctioning components,
Indication out of tolerance
NO 2 - (S32)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
Indication out of tolerance
NO 1 - (R20)
Replace malfunctioning components,
In NOR-FULLY CCW
NO 2 - (R21)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
IN-NOR-FULLY
NO 1 (R14)(R20)
Replace malfunctioning components,
CW
NO 2 (R1114)(R21)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
4-14 Change 2
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