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AIR DEMAND REGULATOR TROUBLESHOOTING INSTRUCTIONS		Up
TB-5-4220-200-12-1 Open Circuit Scuba System Manual		Next
DIVER'S TANK BLOCK TROUBLESHOOTING INSTRUCTIONS (P/N 2800-00)



TB 5-4220-200-12-1
Table 4-3. TROUBLESHOOTING - ORGANIZATIONAL (CONT)
6. DIVER'S TANK BLOCK TROUBLESHOOTING INSTRUCTIONS (P/N 0638)
ITEM
NO.
MALFUNCTION
PROBABLE CAUSE
CORRECTIVE ACTION
1
Air leak from center
a. Replace nipple and disc
a. Nipple and disc (fig. 4-3)(10).
(10). (Section VI. para 4-16b).
yoke output connector
(fig. 4-3) (7).
b. Replace main stem (11),
b. Main stem (fig. 4-3)(11) damaged.
(Section VI, para 4-16b).
2
Air leak from center
a. Connector (fig. 4-3)(6) loose.
a. Tighten connector (6).
yoke connector (fig.
4-3(6) and (8).
b. Connector (fig. 4-3)(8) loose.
b. Tighten connector (8).
c. Insert washer (fig. 4-3)(22)
c. Replace insert washer (22)
damaged.
(Section VI, para 4-16b).
d. Reserve elbow insert (fig. 4-3)(21)
d. Replace reserve elbow in-
damaged.
sert (21) (Section VI,
para 4-16b).
3
Air leak from the
a. Main stem gasket (fig. 4-3)(12)
a. Replace main stem gasket
ON/OFF handle.
damaged.
(12). (Section VI, para 4-16b).
b. Main stem O-Ring (fig. 4-3)(13)
b. Replace main stem O-Ring
damaged.
(13). (Section VI, para 4-16b).
c. Bonnet back-up ring (fig. 4-3)(14)
c. Replace bonnet back-up
damaged.
ring (14), (Section VI.
para 4-16b).
d. Bonnet O-Ring (fig. 4-3)(15)
d. Replace bonnet O-Ring (15),
damaged.
(Section VI, para 4-16b).
e. Bonnet (fig. 4-3)(16) damaged.
e. Replace bonnet (16),
(Section VI, para 4-16b)
4
Air leak from tanks.
a. Elbows (fig. 4-3)(5) or (30) loose.
a. Tighten elbows (5) or (30)
as appropriate.
b. O-Ring (fig. 4-3)(4) or (26)
b. Replace O-Ring (4) or (26)
damaged.
as appropriate. (Section III,
para 4-8 and Section VI,
para 4-16b).
5
No reserve air supply.
a. Reserve disc and retainer (fig.
a. Replace reserve disc and
4-3)(25) worn or damaged.
retainer (25), (Section VI,
para 4-16b).
b. Insert spring (fig. 4-3)(23)
b. Replace insert spring (23).
damaged.
(Section VI, para 4-16b).
c. Pin and plunger spring (fig. 4-3)
c. Replace pin and plunger
(31) damaged.
spring (31). (Section VI,
para 4-16b).
4-6



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