TM 11-5805-424-15/NAVELEX 0967-220-9010/TO 31W2-2G-41
c. Troubleshooting Chart-Continued
Item
Symptom
Probable trouble
Corrective measure
No.
4
No transmit data supplied by
d. Shorted LINE MONITOR SEND
d. Check jack; replace, if defective (fig.
MD-674(P)/G-Con.
jack J3.
8-28).
e. Defective OUTPUT LEVEL ADJ
e. Check control resistance (fig. 6-29);
control R6.
replace control, if defective (fig.
8-28).
5
No receive data supplied by
a. Defective input transformer T3 (fig.
a. Check transformer voltage and re-
MD-674(P)/G.
6-28).
sistance (fig. 6-42); replace trans-
former, if defective.
b. Shorted ORDER WIRE RECEIVE
b. Check jack; replace, if defective (fig.
jack J2 (fig. 3-1).
8-28).
c. Shorted LINE MONITOR RE-
c. Check jack; replace, if defective (fig.
CEIVE jack J4.
8-28).
6
Send transition alarm cannot
Defective TRANSMIT TRANSI-
Check resistor; replace, if defective (fig.
be activated or is always
TION ALARM TIME resistor R7
8-28).
activated.
7
Send carrier alarm cannot be
Defective XMIT CARRIER ALARM
Check resistors; replace defective com-
activated or is always
THRESHOLD R14 or TIME R15
ponent (fig. 8-28).
activated.
resistor.
8
Receive transition alarm can-
Defective RECEIVE TRANSITION
Check resistor; replace, if defective
not be activated or is always
ALARM TIME resistor R8.
(fig. 8-28).
activated.
9
Receive carrier alarm cannot
Defective REC CARRIER ALARM'
Check resistors; replace defective
be activated or is always
THRESHOLD R11 or TIME R12
components (fig. 8-28).
activated.
resistor.
10
Loss-of-transmit-carrier alarm
activated when INPUT
80034210 (fig. 6-21).
3 of PC 80034210 (fig. 6-19). If
SELECT switch is set to
not present, check capacitors C1
MARK only.
through C5, inductor L1, resistors
R1, R2, and R3, and transistors
Q1 and Q2 (fig. 8-21); replace
defective components.
b. Defective crystal Y1
b. Replace crystal Y1.
c. Defective amplifier AM-1 on PC
80034220.
and fig. 8-21); replace defective
components.
d. Defective AND gate GAI-1 on
PC 80034220.
components.
11
Loss of-transmit-carrier alarm
activated when INPUT
80034210 (fig. 6-21).
4 of PC 80034210 (fig. 6-19). If
SELECT switch is set to
not present, check capacitors C6
SPACE only.
through C10, inductor L2, resis-
tors R5, R6, and R7, and tran-
sistors Q3 and Q4 (fig. 8-21);
replace defective components.
b. Defective crystal Y2
b. Replace crystal Y2.
c. Defective amplifier AM-2 on PC
c. Check amplifier stage (para 67b
80034220 (fig: 6-21).
and fig. 8-21); replace defective
component.
d. Defective AND gate GAI-2 on
PC 80034220.
components.
6-44
