TM 11-5820-357-20D E P A R T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L

ORGANIZATIONAL MAINTENANCE MANUAL

RADIO RECEIVER R-390/URR

H E A D Q U A R T E R S D E P A R T M E N T O F T H E A R M Y 23 MARCH 1961

*TM 11-5820-357-20

Technical Manual

No. 11-5820-357-20

C HAPTER

C HAPTER

C HAPTERSection

C HAPTER

INTRODUCTIONScope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Forms and records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .INSTALLATIONUnpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking unpacked equipment . . . . . . . . . . . . . . . . . . . . . . .Installation requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .External connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Remote control receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAINTENANCE INSTRUCTIONSGeneralScope of second echelon maintenance . . . . . . . . . . . . . . . . . . . . .Tools, materials, and test equipment required . . . . . . . . . . . . . . . .Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Lubrication of mechanical tuning system . . . . . . . . . . . . . . . . . . .TroubleshootingVisual inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Equipment performance checklist . . . . . . . . . . . . . . . . . . . . . . . .Troubleshooting techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tube replacement techniques . . . . . . . . . . . . . . . . . . . . . . . . . . .Removal and replacement of Power Supply PP-621/URR . . . . . . . . .Removal and replacement of pilot lamps . . . . . . . . . . . . . . . . . . . .SHIPMENT AND LIMITED STORAGEDisassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Repacking for shipment or limited storage. . . . . . . . . . . . . . . . . . .

A PPENDIX REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON 25, D. C., 23 March 1961

RADIO RECEIVER R-39O/URR

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*This manual supercedes so much of TM 11-856, 11 January 1955, as pertains to organizational maintenance.

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CHAPTER 1

INTRODUCTION

1. Scope

This manual covers the installation andsecond echelon maintenance of Radio Re-ceiver R-390/URR. The operating instruc-tions for this equipment are contained inTM 11-5820-357-10.

2. Forms and Records

Forward comments concerning thistmanual to the Commanding Officer, U. S.Army Signal Materiel Support Agency,ATTN: SIGMS-PA2d,, Fort Monmouth, N. J.Note. For applicable forms and records, see TM11-6820-357-10.

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CHAPTER 2

INSTALLATION

3. Unpackinga. Packaging Data (fig. 1). When packed

for shipment, the components of Radio Re-ceiver R-390/URR are placed in a cartonwhich is packed in a wooden shipping crate(fig. 1). The wooden shipping crate is 21inches high, 32 inches wide, and 32 inchesdeep. Its volume is approximately 12.4cubic feet and the total packed weight isapproximately 8 3 pounds.

b. Removing Contents. Perform all thesteps outlined be low when unpackingthe equipment.

Caution: Be careful when uncrating, un-packing, and handling the equipment be-cause it is easily damaged.

(1) Place the crate as near the operat-ing position as is convenient.

(2) Cut and fold back the metal straps.(3) Remove nails from the top of the

crate. Do not attempt to pry it offbecause the equipment may becomedamaged.

(4) Remove the technical manuals andthe paperboard carton containingthe spare parts.

(5) Slit open the fiberboard carton andfold the flaps back.

(6) Remove the protective plywoodpanel.

(7) Grasp the carrying handles of thereceiver and carefully withdrawthe receiver from the fiberboardpadding which is between the re-ceiver and the fiberboard carton.Place the receiver on a bench ornear its final location.

4. Checking Unpacked Equipment

a. Check the contents of the cartonsagainst the master packing slip.

b. Check the front panel of the receiverfor damage to the knobs or to the glass win-dows of the meters and frequency indicatordial.

c. Operate the control knobs; examinethem for looseness.

(1)

(2)

Operate the MEGACYCLECHANGE and KILOCYCLECHANGE knobs throughout theirranges. Rough operations or bind-ing may indicate a damaged tun-ing system.Do not operate the KILOCYCLECHANGE knob past the point wherea red+ or - sign appears on the fre-quency indicator.

d. Remove the top and bottom dustcovers by removing the 16 screws (TM ll-5820-357-10) and lockwashers that securethe covers to the main frame. Replace thescrews and lockwashers that hold the dustcovers in their positions so that they areavailable when the dust covers are rein-stalled.

e. Inspect the subchassis on the upperand lower decks of the receiver for loosetube shields and broken tubes.

f. If the receiver is to be used in a fixedinstallation, remove the shields from alltubes (fig. 8 and 9), except V201 throughV206, V505, and V701.

g. Unless extremely dusty conditionsare expected, do not replace the dustcovers.

h. Do not replace the dust covers if thereceiver is to be installed in Cabinet, Elec-trical Equipment CY-979/URR or CY-917/URR. Securely wrap the tube shields andthe dust covers. Mark the nomenclatureand the serial number of the receiver fromwhich they were removed on the cover ofthe package. Store them for future use. Re-install the tube shields and dust coverswhen the receivers are stored or shipped.

i. See that all conectors are seatedfirmly and are in their respective sockets.Loose or improperly seated connectorsare a common cause of faulty operationofradio equipment..

j. Remove the three fuses from the rearpanel (TM 11-5820-357-10). Check to seethat they are of the proper rating. Makesure that the fuses are firmly seated afterreplacing them.

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F I B E R B O A R DPADDING

the special tools are place in theirholders (TM 11-5820-357-10).l. Remove the small cover (TM ll-5820-357-10) at the lower right-hand cor-ner of the rear panel. See that the sparefuses are of the proper ratings and are inplace.m. Check the contents of the box thatcontains the running spares for damagedparts.n. Perform the installation and connec-tion procedures given in paragraphs 5 and6.

Caution: To avoid serious damage tothe receiver, do not use any fuse otherthan the value specified,

5. Installation Requirements

If the receiver is used as a part of a sys-tem, refer to the technical manual for thatsystem. Instructions for installing the re-ceiver for fixed and mobile use are listedin a through d below.

Note. The receiver is frequently used with rhombic, doublet, or double-doublet receiving-type antennas.For information on the rhombic and doublet antennas, refer to TM 11-666. For informationon the double-doublet antenna, refer to TM 1 l-2629.

FIBERBOARDC A R T O N

WOODENSHIPPING CRATE

a. Fixed tablefop Installation. Whenhoused in cabinet CY-917/URR or a simi-lar well-ventilated case for fixed opera-tion, the receiver can be placed on anysturdy bench, table, or desk.b. Fixed Cabinet Installation.To installthe receiver in a standard cabinet, such asCabinet, Electrical Equipment CY-1119/U, remove the top and bottom dust coversto increase ventilation.Remove one of theblank panels from the cabinet and installthe receiver. Secure the front panel to thecabinet with the bolts removed from thethe blank panel. Insert them in the elon-gated holes along the vertical edges of thereceiver front panel.c. Mobile, Tabletop Installation. When

TM5820-357-20-1I the receiver is housed in Cabinet, Elec-trical Equipment CY-979/URR for mobile

Figure 1. Unpacking. operation, the cabinet must be securelybolted to a table or bench. Allow enough

k. Inspect for bent or broken connectors room for ventilation, access to the connec-and terminals on the rear panel. See that tions on the back panel, and withdrawal of

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the receiver from the cabinet for servic-ing. Adequate lighting facilities must beprovided to permit reading the controlnames and positions during day and nightoperation.

d. Mobile, Cabinet, or Rack Installation.When the receiver is installed in Cabinet,Electrical Equipment CY-1216/U for mo-bile operation, the cabinet must besecurely bolted to the vehicle body, Allowenough room for access to back panel con-nections and for the withdrawal of the re-ceiver for servicing. Provision for light-ing must be made to permit reading con-trol names and positions during day andnight operation.

Caution: When the receiver is installedin any cabinet other than described above,adequate ventilation must be provided. For

mobile applications of the receiver in cabi-nets other than Cabinets, Electrical Equip-ment CY-979/URR and CY-1216/U, sup-port must be provided at the rear of thereceiver, so that the front panel does notcarry the entire weight of the receiver.

6. External Connections

Use the step-by-step procedure shownin figure 2 to make the external connec-tions to the rear panel (TM 11-5820-357-10) of the receiver.

7. Remote Control Receptacle

Several terminals on terminal boardsTBlOl and TB102 are connected inparallelwith REMOTE CONTROL 5105 recep-tacle. This receptacle is not ordinarilyused.

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1 Connect GND terminal 16 to the someground used with associated equipment.

1 .,,l .,Y”“;

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2 Determine whether the power source is115 vac or 230 vac then check to see that115/230 volt switch S801 on Power SupplyPP-621 /URR is in the proper position for op-eration of the receiver from the availablepower source.

Caution: If the receiver is to be operatedfrom a 230 volt ac source, change the fusemarked AC3A from a 3 ampere, 125 volttype MS F02D3RB to o a11/2 ompere, 250 volttype MS F02G3ROOA.

3 Connect Power Cable Assembly CX-1358/U between the power source and thePOWER receptacle J104.

4 To connect the receiver to o 50 to 200ohm balanced antenna, such as a balanceddoublet, to the BALANCED ANTENNA Con-nector, use Radio Frequency Cable RG-22/Uwith Connector Plug UG-421/U or use RadioFrequency Cable RG-B6/U with ConnectorPlug UG-969/U.

Figure (1). Connecting procedures (part 1 of 4).

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5 TO adopt unbalanced coaxial lead-incable to the BALANCED ANTENNA CON-NECTOR use Adopter Connector UG-971/Uwhen lead-in is terminated in Connector PlugUG-573/U.

Note: Use Connector Plug UG-970/U whencoaxial cable is terminated in Connector PlugPL-259.

6 use connector Plug UG-573/U to con-nect the unbalanced ANTENNA CONNEC-TOR to a whip antenna or to a random-lengthsingle-wire antenna. The whip lead-in shouldbe as short a length as possible of RadioFrequency Cable RG-8/U or RG-11 /U.

7 Plug the 600 ohm headset into thePHONES Jack if the headset is to be con-nected to the rear panel terminal board per-form step 8.

8 Connect the headset to the PHNS termi-nal 8 and terminal 7 (ground).

Figure 2(1) Connecting procedure (part 1 of 4)

9 Connect the loudspeaker (if used) toLOCAL AUDIO terminals 6 and 7.

10 For balanced line audio output opera-tion, connect the balanced line to LINEAUDIO terminals 10 and 13. If a balancingbridge is to be used for remote applicationsperform steps 11 and 12.

11 Remove the jumper from terminals 11and 12.

1 2 Connect the balancing bridge betweenterminals 11 and 12, (see step 11).

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13 If a transmitter is being used with thereceiver in break-in operation, connect thecontrol lines from the transmitter to BRK-INterminal 9 and GND terminal 16.

14 For external rf gain control, removethe jumper between RF GAIN terminals 1 and2 and perform step 15.

15 Connect an external 5,000-ohm poten-tiometer to RF GAIN terminal 1 and to termi-nal 7 ground, (see step 14).

Figure 2(4). Connecting procedures (part 3 of 4).

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16 To use an external diode load, removejumper from DIODE LOAD terminals 14 and15 and perform step 17.

17 Connect the lines from the externaldiode load to terminals 14 and 15. (see step16).

20 Connect coaxial transmission cableterminated in Radio Frequency Plug UG-88/U to IF OUTPUT receptacle J106 when itis necessary to use the IF output of thereceiver.

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21 If wide variations in temperature arelikely to be encountered, turn the OVENSheater switch to ON.

18 For external agc,, remove the jumperfrom AGC NOR terminals3 and 4 and per-form step 19.

19 Connect the negative terminal of theexternal age source to terminal 4 and thepositive terminal of the age source to termi-nal 7 (ground) (see step 18).

Figure 2(4).. Connecting procedures (part 4 of 4).

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