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MODEM BENCH TEST SETUP AND TEST CONDITIONS
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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TROUBLESHOOTING CHART (Cont)
TM 11-5805-387-34-2
3-6. TROUBLESHOOTING CHART
Use the troubleshooting chart to localize and isolate trouble.  The chart supplements the direct support
troubleshooting chart of paragraph 2-6 and the foldouts at the back of this manual.
The troubleshooting chart is Indexed by MALFUNCTION/SYMPTOM for which PROBABLE CAUSES are listed.
Follow the TEST PROCEDURES for which in turn an INDICATION and YES or NO instructions are given.
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(1) ON-OFF SWITCH (CB1) CONTINUES TO
Defective: Power source. Circuit breaker CB1.
TRIP
Circuit board A9.
CAUTION
Do not hold ON-OFF switch at ON.
1. Check polarity and voltage to PRIMARY
Proper polarity
Go to 2.
Replace
POWER connector J8.
and +27 vdc
defective
power source
(TM 11-5805-
387-10-2).
Do all continuity and resistance checks with all power removed.
2. On the inside of the front panel remove the
Replace
Replace
L-shaped compartment housing (refer to
defective
defective
para 2-9), check CB1 continuity with power
board A9
CB1 (para
source removed.
(2) NO TEST METER OR SCOPE READINGS
Defective: Circuit board A9. Series regulator
FOR ANY POSITION OF METER
Transistors Q1, Q2, Q3. Connector J8.
FUNCTION SWITCH.
1. Connect ME-26B/U across terminal 5 on
+22 vdc
Go to 2.
Replace
board A9 (or E-37 on panel); measure
0.5
defective
voltage. Refer to figure on next page.
board A9
3-3

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