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frÂINTENANi:E rirther thun rt'pa"iretl. See note at end of paragraph 2, c (1) (ru) ..;t this section. In the Primarl PotR'er Distribution System a short circuit will blow the iine fuses. Corrective measures consist of location and correction of the fault and refusing of the t ircurt before operation is resumed. i':) ft: l'l\ CIRCUITS'-[n open circuit exists lvlrr-rn r:ontir liv through a conductor is broken. Most opc r r i:i i,- i !r ir; a;'e caused by the conductor acfually br-'ekiu;I ilrnl n .'re!.-ry interrupting the electrical path. Oper\ t";';r',rt\. | ) detected by use of an ohmmeter a.p;ihed [;-r ilir: c;lylosite ends of the same conductor in a cable. An open circuit will show up as infinite resistance through the conductor. Open circuits are evidenced by loss of output power in a connected circuit. (f) IMPROPERLY GROUNDED SHIELD IN AF SECTION.-If the metal braid shielding is not tied to the common ground, interaction between receiviers may occur. This condition is usually the cause .f "cross-talk" between adjacent circuits. Locate un- S"ounded shields with an ohmmeter and correct by proper groundirrg. (g) IMPROPERLY GROUNDED SHIELD I N RF SECTION.-If the shields in the RF section are rrot properly grounded, the effects are not as noticeai,ie as in the AF section. Voltages may be set up in the shields, however, which may effect the attenuation characteristics of the line and cause high noise level. , ,Jreck frequently and reground as necess ary. (2) ANTENNA SELECTOR SWTTCH, TROUBLE SHOOTINC.-The Antenna Selector Sw'itch is the most complicated component of the Sigri,i'l'i Distribution Unit and consequently is the most :rusceptible to trouble. It should be tested monthly ii''r mechanical action, continuity, and grounds. (a) ONE POSITION FAULTY.-This indicates that one of the station ary contacts is faulty. (b) EVERY SECOND POSTTTON FAULTY. This will occur only on the 40 and 60 position sizes. This l rually indicates that the contact on one end of the niti;r' rrm is defective. ti,' c) ALL POSITIONS FAULTY.-C e n t e r (comnirn) contact is usually defective. Since the 20 position switch has only one rotor contact, it may also cause the whole switch to be inoperative. (d) oNE wrrolE SEGMENT TNOPERA- 'T'IVE.-If several adjacent contact positions are faulty, suspei:t that the axis of the rotor is not perpendiculi,.r to the plane of the contact ring. (e) OPERATION INTERMITTENT ON ALL POS{'f ir;i{S."- This indicates that the detent mechani:;jfi) is irot- hotiilng the lotcr in the contact position. )RlG!F*,4[ NAVSHTPS 9rO47 Section 3 (d) RESTRICTED Porogroph 2 c (l) Rotate the knob to see that the detent action is positive and that the shaft is not sticky, thus preventing it from returning to its proper position. See if continuity can be restored by moving the knob. (T) HIGTI NOISE LEVEL IN A PARTICU- LAR CIRCUIT.-This usually indicates that the ground contacts are faulty. (3) ANTENNA SELECTOR SWTTCH, COR- RECTIVE ACTION. ( a) If only one contact position is defective, it may usually be repaired without removing the switch from the Signal Distribution Unit. The most Iikely cause is insufficient interference between the station ary contact and the spring loaded contact on the Rotor. Loosen the locking nut (see figure 3-3) and tighten the Connector Navy Typ" -49f91 until it is handtight. DO NOT USE A WRENCH OR THE INSULATING WASHER WILL BE DAN{ACED. Tighten the Lockitrg Nut with a wrench and check the continuity. If this does not correct the trouble, remove the Connector from the equipment. The Contact and Insulating Washer should come out with it. Inspect for corrosion and damage. Clean with chamois and replace parts as necess ary. Insure that there is good contact between contact E-202A and the contact sleeve of the Connector. Replace the Insulator E-202C if it is cracked or deformed. Screw Connector securelv into the rear of the Contact Ring and re-check. This should correct the trouble. (b) If all contact positions are inoperative, suspect the center contacts. Loosen the Locking Nut on the center Connector J-201 and screw the Connector in until it is handtight. Tighten the Locking Nut. If this does not correct the discontinuity, remove the Connector and inspect contact. Clean with chamois or replace as necess ary. Insert a pair of long-nose pliers through the hole left by the removal of the center Connector and carefully pull out the contact F.202A. Clean or replace as necess ary. If spring 0-202 has become weak, remove it in the same manner and replace. Replace the contact E-202A and press it in with the index finger to see that the spring C,-202 is loading it sufficiently to insure positive contact. Reassemble and test again. If this does not correct the trouble, the whole switch must be removed and disassembled for repairs. ( c) Alt other troubles require that the switch be removed from the equipment. Proceed as follows: 7. T"g all cables and disconnect them. 2. Remove the Control Knob. 3. Remove the eight screws on the rear Connector Plate which hold the switch in the Switch Cover
3 Section Porcgrqph 2 c (3) (c) NAVSHIPS 91047 MAINTfiNAT-.ICE CENTERING SLEEVE E-2s3 INSULATOR E-260 CONTACT SLEEVE L-252 2O2 SPRING swtTcH coNTAc;- c-263 BEARI.iG C -2f! E-?l.?A CONTACT LOCKING NUT CONNECTOR J-2OI NAVY TYPE-49I9I (neceerncle) MOUNTING BRACKET DETENT ARM SHAFT SPRING 0-206 O BEARING O-2O7 SPRING WASHER H-2O2 SPROCKET O-2O5 DETENT MOUNTING FRAME ADJUSTER E-202C INSULATOR @ @ a a O g.-sEr scREw E.2O2A CONTACT E-253 CENTERING SLEEVE LOCKING NUT CONNECTQR J-2OI r.tRvv tvfN - 49t91 ( cre) .i. E-AsO CONTACT SLEEVE 5 INSULATOR E-2C2A C( Figure 3-2. Anlennq Selector Switch AN Type SA-l4O/U, Cutowoy Box and pull out the whclle switch. The front panel may be left in place if desired. Do not rernove Switch Cover Box from panel. ( d) If every second switch position is faulty, spect the Insulator for darnage or dirt which rnight cause arl RF ground. Insure that the grounding contact is applying a positiver pressure agairrst the Contact Ring. (e) If the rotor contact or insulator require re- placernent, the Detent Mounting Frame must be removed to allow rernoval of the cap nut. Remove th.' three screws on each end of the Detent N{ounti;r.i one of the end rotor contacts is defective. llotate the switch slowly noting whether both contacts are making with the stationerry contacts. There should be at least 0.010" interference between the stationery rotor and the contacts to insure positive contact. Check Frame and lift ofi the Detent Mounting Frarne. Tl:r,- with a feeler gauge to see that the rotor contacts have a clearance of at least 0.020" from the Contact Ring when they are between the stationary contacts or they will ground the circuit. Adjust by loosening the Lock- ing Nut on the Rotor Contact Arm (see figure 3-4) and rotate the Cap Nut to give the proper clearance. In- Rotor is now free ancl rnav be also lifted ourr. Tht: end rotor contacts are now acccessible. Iieassen'blt: in tI,r; same manrler, making strre that the center cor-ttact does not drop out of the cor-rtrrct sleeve during re ser,rbii'. Adjust the position of the Detert Moulting ri{rne as described in paraglaph 2, c (3) (i; ,;irl'r',". 3-6 REsrRtcrED ot(i(irNAl
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NAYSHIPS 9T.O47 s {t INSTRUCTTON BS
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Effective Poges NAVSHTPS 9rO47 FRON
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Correction Poge NAVSHTPS 9rO47 FRON
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Contents NAVSHIPS 91047 FRONT MATTE
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lllustrotions qnd Tobles NAVSHTPS 9
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Miscellqneous Dotq NAVSHTPS 9rO47 R
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1 Section NAVSHIPS 91047 t GENERAL
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1 Section Porogroph I d NAVSHTPS 9r
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1 Seclion Porogroph 3 q (l) compone
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1 Section Porogroph 3 q (5) NAVSHTP
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3q(7) NAVSHIPS 91047 GE \'ERAL DESC
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1 Section Porogroph 3 q (lI) NAVSHI
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1 Section Porogrcph 3 s (14) NAVSHI
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1 Section Porogroph 3 q (18) Figure
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1 Section Porogroph 4 NAVSHTPS 9rO4
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1 Section Toble l-2 NAVSHIPS 9rO47
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1 Section Tqble l-4 TABTE I.4. NAVS
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1 Section Tqble l -6 TABTE I.6. NAV
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1 Section Tqble l-7 NAVSHIPS 9rO47
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INSTAI:.A,"lOtt An\t" NAVSHIPS 9104
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lN$T'ALt ATION AND CPERA; 'N | , ,i
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:..:,., : iNSTALIAiION AND OPE:iA]
Page 47 and 48: iNSTAILATION AND NAVSHTPS 9rO47 Sec
Page 49 and 50: aNSTALId{TION AND c)FElr:r\1'1i1N N
Page 51 and 52: INSTAÎI,,f\TION AND OIIEfr ATI'.}N
Page 53 and 54: '{\t ';TJ\LI. ATION AND t )i'Eh, 'i
Page 55 and 56: I'{STALII=TIT}N AND {)PEItA'i':*)\!
Page 57 and 58: lf$5TAl I ,*r li'lf,iFtl AND ,Jii[R
Page 59 and 60: !NSTA[!.A[IONI At"lD C}PERATiEF,I N
Page 61 and 62: INs TAI,i.ATIt'f.I AND CIPERATIC.f
Page 63 and 64: INSTAIIAI I'-,$ti jti{D OPERATIGT.'
Page 65 and 66: INSTAIuATIC,N Ah{t, OPERA.IQII{ iE,
Page 67 and 68: irugrA[[A?'.]l-l A r-fD OFtftATION
Page 69 and 70: { AND NAVSHTPS 9rO47 Section 2 Figu
Page 71 and 72: LAFI'iNr{ AND noN NAVSHIPS 91047 Se
Page 73 and 74: 'iit ''fr 1 ATION AND toN NAVSHIPS
Page 75 and 76: I sTAI.I,AYICN F ND )ERAI *rf*l NAV
Page 77 and 78: INSTATTATION AND OPERATION NAVSHIPS
Page 79 and 80: D NAVSHIPS 9rO47 Section 2 Figure 2
Page 81 and 82: NAVSHIPS 91047 Section 2 Figure 2-3
Page 83 and 84: .LATION AND ,TloN' NAVSHIPS 9rO47 S
Page 85 and 86: )N AND NAVSHIPS 9rO47 Section 2 Fig
Page 87 and 88: -l -l NAVSHTPS 91047 Section 2 Figu
Page 89 and 90: dl I LLATION AND \TION NAVSHIPS 9rO
Page 91: G J AIIATION AND TATION NAVSHIPS 9r
Page 94 and 95: Me TNTENANCE NAVSHIPS 9rO47 Section
Page 96 and 97: MAINTET'IAI-ICE NAVSHIPS 9rO47 Sect
Page 100 and 101: MAINTEN"qf*tCE ( f ; If several adj
Page 103 and 104: I I I F{ F{ F{ F{ 4 Section Spore P
Page 105 and 106: ar l9 ra \v - F F 4 Section A-l ol
Page 107 and 108: 1 4 Section A-l4f _ E-241C NAVSHIPS
Page 109 and 110: F{ vvvv vvv v F{ Fl F{ F{ r-{ F{ v
Page 111 and 112: Aal FF Fts .F .- FF FH la \v lv !v
Page 113 and 114: l.\ a\ '-\ .F'F F4LvLv dd- ts A\ vv
Page 115 and 116: -\ F{ F{ -.{ F{ F{ P{ 4 Section H-l
Page 117 and 118: vv F{ Fi aa ^l l-) ^l 6\ 6\ F- Hts
Page 119 and 120: vv vvvv vvvv HH 4 Section N-l 06 N-
Page 121 and 122: I 4 Section N-l301 N-l503 NAVSHTPS
Page 123 and 124: --^ww vvvv vvvv 1 \J \I vv +, +J 4
Page 125 and 126: \Jv!/vv a 4 Section P-401B S-20I NA
Page 127 and 128: I aÂAA v \-/ \-/ v zh vvvv 4 Secli
Page 129: I '! H F{ FL 4 Section NAVSHIPS 910
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