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Page Title:
Table 2-1. Troubleshooting- CONT |
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 TM 10-3930-609-35
Malfunction
Probable cause
Corrective action
(2) Check for grounds in wires 29
and 29A or short ed accelerating
potentiometer, connecting ohm-
meter at thermal protector TP.
b.
Relays IF and IR close with full
(1) Check for welded contacts on
speed immediately but no audible
relay 1A. Replace if unservice-
hum.
able and inspect relay for other
possible defects (para 3-122
through 3-128).
(2) Check timer section of Card 1
c.
Relays IF and IR close with full
c.
Make the following checks in se-
speed immediately, no audible hum,
quence as required:
and capacitor 1C not charged. (Check
(1) Check 5REC for open gate and
voltage across 1C to determine con-
shorted condition (para 2-7). If
dition-wire 63 negative.)
shorted, also check transformer
filter (para 2-9c).
(2) Check for open gate circuit to
5 REC (para 2-9a).
(3) Check continuity of wiring from
1C to 5REC and from 5REC
through TS, T4 to T1 and wire
to 1 REC anode.
(4) Disconnect battery discharge ca-
pacitor 1C and check resistance
with an ohmmeter, using the RX
10,000 scale. Meter should read
zero at first, then swing to above
100,000 ohms. Replace
capacitor if final reading is not at
least 100,000 ohms.
(5) Check 1REC for short (para 2-7).
d.
Relays IF and 1R close with full
d.
In order, check 2REC for open, open
speed immediately, no audible hum,
gate, and open gate circuit
and capacitor 1C charged. (Check
voltage across 1C to determine con-
4. Control circuit remains in SCR
dition-wire 63 negative.)
With drive wheels of truck off the
range with accelerating control
Relay 1A fails to operate.
floor, make the tests as required
fully depressed.
(1) With switches closed for opera-
tion, connect jumper from bat-
tery negative to wire 41 at SCR
terminal board. Relay 1A should
pick up immediately unless coil
is open. Replace coil if open
(2) Move jumper to connect wire 41
to wire 45 at SCR terminal
board. Relay 1A should pick up
when the directional control
switch is closed and the acceler-
ating control is fully depressed
to close switch ASA2. This test
checks switch ASA2 and wiring.
(3) If the two preceding tests check
good, check timer section of Card
5. Plugging action of truck too severe
a.
Plugging trim-pot on Card 1 requires
a. Turn PLUGGING trimpot counter-
or too soft.
adjustments.
clockwise to lengthen stopping
2-6
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