TM 11-5820-765
TM 11-5820-765-12
DEPARTMENT OF THE ARMY TECHNICAL MANUAL
OPERATOR AND ORGANIZATIONAL MAINTENANCE MANUAL
POWER SUPPLIES
PP-4763/GRC
AND PP-4763A/GRC
This copy is a reprint which includes current
pages from Changes 3 and 4.
HEADQUARTERS,
DEPARTMENT
28 OCTOBER 1968
TAGO 6195A
OF
THE ARMY
WARNING
DANGEROUS VOLTAGES EXIST IN THE EQUIPMENT
DON’T TAKE CHANCES!
Low-voltage, high-amperage current is present at output connections
and at connections inside the equipment. Do not touch connections or remove the cabinet cover until equipment is removed from power source.
Reenergize the power supply before connecting or disconnecting the equipment to be powered and before performing any maintenance.
Be careful when working on the 115- or 230-volt ac line connections.
Serious injury or DEATH may result from contact with these terminals.
Changes in force: C3 and C4
TM 11-5820-765-12
*C4
Change
HEADQUARTERS
DEPARTMENT OF THE ARMY
No. 4
Washington, DC, 26 November 1983
OPERATOR’S AND ORGANIZATIONAL
MAINTENANCE MANUAL
POWER SUPPLIES PP-4763/GRC (NSN 5820-00-937-7690)
AND PP-4763A/GRC (NSN 5820-00-113-9768)
TM 11-5820-765-12, 28 October 1968, is changed
as follows:
The title of the manual is changed as shown above.
Page 1-1. Paragraph 1-1 is superseded as follows:
1-1. Scope
a. This
manual
describes Power Supplies
PP-4763/GRC and PP-4763A/GRC (fig. l-l) and
provides instructions for their installation, operation, and maintenance. It includes instructions for
cleaning and inspection of the equipment, and
touchup painting instructions.
b. The Components of End Items List is contained in appendix B.
c. The Maintenance Allocation Chart (MAC)
appears in appendix C.
d. Appendix C is current as of 15 October 1968.
Page 1-1. Paragraph 1-2 is superseded as follows:
1-2. Consolidated Index of Army Publications and
Blank Forms
Refer to the latest issue of DA Pam 310-1 to determine whether there are new editions, changes or
additional publications pertaining to the equipment.
Page 1-1. Paragraphs 1-3, 1-3.1 and 1-3.2 are
superseded as follows:
1-3. Maintenance Forms, Records, and Reports
a. Reports of Maintenance and Unsatisfactory
Equipment. Department of the Army forms and
procedures used for equipment maintenance will
be those prescribed by TM 38-750, The Army
Maintenance Management System.
b. Report of Packaging and Handling Deficiencies. Fill out and forward SF 364 (Report of
Discrepancy (ROD)) as prescribed in AR 73511-2/DLAR
4140.55/NAVMATINST
4355.73A/
AFR 400-54/MCO 4430.3F.
c. Discrepancy in Shipment Report (DISREP)
Fill out and forward Discrepancy
(SF 361).
in Shipment Report (DISREP) (SF 361) as prescribed
in
AR
55-38/NAVSUPINST
4610.33C/
AFR 75-18/MCO P4610.19D/DLAR 4500.15.
Errors and
Recommending
1-3.1. Reporting
Improvements
You can help improve this manual. If you find any
mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter or
DA Form 2028 (Recommended Changes to PubComlications and Blank Forms), direct to:
mander, US Army Communications-Electronics
Command and Fort Monmouth, ATTN: DRSELME-MP, Fort Monmouth, New Jersey 07703.
In either case, a reply will be furnished direct
to you.
Equipment
1-3.2. Reporting
Improvement
Recommendations (ElR)
If your Power Supply needs improvement, let us
know. Send us an EIR. You, the user, are the
only one who can tell us what you don’t like about
your equipment. Let us know why you don’t like
the design. Put it on an SF 368 (Quality Deficiency Report). Mail it to Commander, US Army
Communications-Electronics Command and Fort
Monmouth, ATTN: DRSEL-ME-MP, Fort Monmouth, New Jersey 07703. We’ll send you a reply.
Page 1-1. Paragraphs 1-3.3 and 1-3.4 are added
as follows:
1-3.3. Administrative Storage
Administrative Storage of equipment issued to and
used by Army activities will have preventive maintenance performed in accordance with the PMCS
charts before storing. When removing the equipment from administrative storage the PMCS should
be performed to assure operational readiness. Disassembly and repacking of equipment for shipment
or limited storage are covered in Chapter 5.
*This change supersedes change 2, 13 Sept 1978.
1
C4, TM 11-5820-765-12
1-3.4. Destruction of Army Electronics Materiel
Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM
750-244-2.
Page 1-2. Add paragraph 1-7 after paragraph 1-6.
1-7. Items Comprising an Operable Equipment
Power Supply PP-4763/GRC (NSN 5820-00-9377690) or Power Supply PP-4763A/GRC (NSN
5820-00-113-9768) is an operable equipment.
Page 2-1. Add the following CAUTION after
subparagraph 2-lb(2):
CAUTION
Due to the weight of Power Supplies
PP-4763/GRC and PP-4763A/GRC, two
people are required for ease of handling,
and to avoid possible injury to personnel,
or damage to equipment.
Subparagraph 2-2b. The second and third sentences are superseded as follows: If a packing slip
is not available, check the equipment against
paragraph 1-7. Report all discrepancies in accordance with AR 735-11-2.
Page 3-1. Chapter 3 is superseded as follows:
CHAPTER 3
OPERATOR’S MAINTENANCE
3-1. Scope of Operator’s Maintenance
The maintenance duties assigned to the operator
of the power supply are listed below together with
a reference to the table or paragraph covering the
specific maintenance function.
a. Operator’s preventive maintenance checks and
services (table 3-1).
b. Cleaning (para 3-3b).
Paragraph 3-2 is deleted.
3-3. Operator’s Preventive Maintenance
NOTE
Refer to TM 750-244-2 for proper procedures for destruction of this equipment
to prevent enemy use.
a. Operator/crew preventive maintenance is the
systematic care, servicing and inspection of equipment to prevent the occurrence of trouble, to reduce downtime, and to maintain equipment in
serviceable condition. To be sure that your equipment is always ready for your mission, you must
do scheduled preventive maintenance checks and
services (PMCS).
(1) BEFORE OPERATION, perform your B
PMCS to be sure that your equipment is ready to
go.
(2) DURING OPERATION, perform your D
PMCS. This should help you to spot small troubles
before they become big problems.
(3) When an item of equipment is reinstalled
after removal, for any reason, perform the necessary B PMCS to be sure the item meets the readi2
ness reporting criteria.
(4) Use the ITEM NO. column in the PMCS
table to get the number to be used in the TM
ITEM NO. column on DA Form 2404 (Equipment
Inspection and Maintenance Worksheet) when
you fill out the form.
b. Routine checks like CLEANING, PRESERVATION, DUSTING, WASHING, CHECKING
FOR FRAYED CABLES, STOWING ITEMS NOT
IN USE, COVERING UNUSED RECEPTACLES,
CHECKING FOR LOOSE NUTS AND BOLTS
AND CHECKING FOR COMPLETENESS are not
listed as PMCS checks. They are things that you
should do any time you see they must be done. If
you find a routine check like one of those listed in
your PMCS, it is because other operators reported
problems with this item.
NOTE
When you are doing any PMCS or routine
checks, keep in mind the warnings and
cautions.
WARNINGS
Be careful when working on the 115- or
230-volt ac line connections. Serious injury or DEATH may result from contact
with these terminals.
Low-voltage, high amperage current is
present at output connections and at connections inside equipment. Do not touch
connections or remove cabinet cover until
equipment is removed from power source.
Reenergize power supply before performing any maintenance.
Adequate ventilation should be provided
C4, TM 11-5820-765-12
while using TRICHLOROTRIFLUOROETHANE. Prolonged breathing of vapor
should be avoided. The solvent should not
be used near heat or open flame; the products of decomposition are toxic and
TRICHLOROTRIirritating.
Since
FLUOROETHANE dissolves natural oils,
prolonged contact with skin should be
avoided. When necessary, use gloves which
the solvent cannot penetrate. If the solvent
is taken internally, consult a physician
immediately.
Compressed air is dangerous and can cause
serious bodily harm if protective means or
methods are not observed to prevent a chip
or particle (of whatever size) from being
blown into the eyes or unbroken skin of
the operator or other personnel. Goggles
must be worn at all times while cleaning
with compressed air. Compressed air shall
not be used for cleaning purposes except
where reduced to less than 29 pounds per
square inch gage (psig) and then only with
effective chip guarding and personnel protective equipment. Do not use compressed
air to dry parts when trichlorotrifluoroethane has been used.
NOTES
The PROCEDURES column in your PMCS
B — Before
charts instruct how to perform the required
checks and services. Carefully follow these
instructions and, if tools are needed or the
chart so instructs, get organizational maintenance to do the necessary work.
If your equipment must be in operation all
the time, check those items that can be
checked and serviced without disturbing
operation. Make the complete checks and
services when the equipment can be shut
down.
c. Deficiencies that cannot be corrected must be
reported to higher category maintenance personnel. Records and reports of preventive maintenance must be made in accordance with procedures given in TM 38-750.
3-4. Operator/Crew
Preventive
Maintenance
Checks and Services (Table 3-1).
NOTES
The checks in the interval column are to
be performed in the order listed.
The terms “ready/available” and “mission
capable” refer to the same status — Equipment is on hand and is able to perform its
combat mission (see TM 38-750).
Table 3-1. Operator/Crew Preventive Maintenance
Checks and Services Chart
D — During
*Do this check before each deployment to a mission location. This will permit any existing problems to be
corrected before the mission starts. The check does not need to be done again until redeployment.
3
C4, TM 11-5820-765-12
Page 4-1.
Chapter 4 is superseded as follows:
CHAPTER 4
ORGANIZATIONAL MAINTENANCE
4-1. Scope of Organizational Maintenance
a. This chapter contains instructions covering
organizational maintenance for the power supply.
It includes instructions for performing preventive
and periodic maintenance services and repair
functions to be accomplished by the organizational
repair personnel.
b. Organizational maintenance of the power
supply includes:
(1) Preventive maintenance checks and services (table 4-1).
(2) Touchup painting (para 4-4).
4-2. Test Equipment, Tools, and Materials
Required
The test equipment, tools, and materials required
for organizational maintenance of the power
supply are listed below:
a. Test Equipment. Multimeter AN/URM-105.
b. Tools. Tool Kit, Electronic Equipment
TK-101/G.
c. Materials.
(1) Trichlorotrifluoroethane. (NSN 6850-00105-3084).
(2) Cleaning cloth.
(3) Fine sandpaper (supplied with Tool Kit,
Electronic Equipment TK-101/G).
(4) Cotton swab sticks.
(5) Silicone (NSN 6850-00-880-7616).
4-3. Organizational Preventive Maintenance
Organizational preventive maintenance procedures
are designed to help maintain equipment in serThey include items to be
viceable condition.
checked and how to check them. These checks
and services, described in table 4-1, outline inspections that are to be made at specific monthly
(M) intervals. Accomplish routine checks as described in paragraph 3-3b including WARNINGS
and NOTES.
Table 4-1. Organizational Preventive Maintenance
Checks and Services Chart
M – Monthly
Item
No.
1
Interval
M
●
. Item to be
Inspected
output
Voltage
Procedures
Check output voltage.
Adjust to read between 27 to 29 volts,
if required.
4-4. Touchup Painting
Remove rust and corrosion from metal surfaces by
lightly sanding them with fine sandpaper. Brush
two thin coats of paint (Enamel, Semigloss, Olive
Drab NSN 8010-00-844-8088) on the bare metal
to protect it from further corrosion. Refer to the
applicable cleaning and refinishing practices specified in TB 43-0118 and the painting supplies
available for field use in SB 11-573.
Page 5-1. Section II, paragraphs 5-3 and 5-4 are
superseded as follows:
5-3. Authority for Demolition
Refer to paragraph 1-3.4. Destruction of Army
Electronics Materiel.
5-4. Paragraph 5-4 deleted.
Page A-1. Appendix A is superseded as follows:
APPENDIX A
REFERENCES
The following is a list of applicable references that are available to the operator and organizational repairman of the power supply.
AR 55-38
Reporting of Transportation Discrepancies in Shipments
(Reports Control Symbol (MTMTS-54)).
AR 735-11-2
Reporting of Item and Packaging Discrepancies.
4
C4, TM 11-5820-765-12
APPENDIX A
REFERENCES
(CONT’D)
DA Pam 310-1
SB 11-573
SB 38-100
SC 5180-91-CL-R13
TB 43-0118
TM 11-6625-203-12
TM 38-750
TM 750-244-2
Page B-1.
Consolidated Index of Army Publications and Blank Forms.
Painting and Preservation of Supplies Available for Field Use
for Electronics Command Equipment.
Preservation, Packaging, Packing and Marking Materials,
Supplies, and Equipment Used by the Army.
Tool Kit, Electronic Equipment TK-101/G (NSN 5180-00064-5178).
Field Instructions for Painting and Preserving Electronics
Command Equipment Including Camouflage pattern Painting
of Electrical Equipment Shelter.
Operator’s and Organizational Maintenance Manual: Multimeter AN/URM-105 and AN/URM-105C (Including Multimeter ME-77/U and ME-77C/U).
The Army Maintenance Management System (TAMMS).
Procedures for Destruction of Electronics Materiel to Prevent
Enemy Use.
Appendix B is superseded as follows:
APPENDIX B
COMPONENTS OF END ITEM LIST
Section I. INTRODUCTION
B-1. Scope
This appendix lists integral components of and
basic issue items for the PP-4763/GRC to help you
inventory items required for safe and efficient
operation.
B-2. General
This Components of End Item List is divided into
the following sections:
a. Section II. Intergral Components of the End
Item. These items, when assembled, comprise the
PP-4763/GRC and must accompany it whenever it
is transferred or turned in. The illustrations will
help you identify these items.
b. Section II. Basic Issue Items. These are the
minimum essential items required to place the PP4763/GRC in operation, to operate it, and to perform emergency repairs. Although shipped separately packed they must accompany the PP-4763/
GRC during operation and whenever it is transferred between accountable officers. The illustrations will assist you with hard-to-identify items.
This manual is your authority to requisition
replacement BII, based on TOE/MTOE authorization of the end item.
B-3. Explanation of Columns
a. Illustration. This column is divided as follows:
(1) Figure number. Indicates the figure number of the illustration on which the item is shown.
(2) Item number. The number used to identify
item called out in the illustration.
b. National Stock Number. Indicates the National stock number assigned to the item and
which will be used for requisitioning.
c. Description. Indicates the Federal item name
and, if required, a minimum description to identify
the item. The part number indicates the primary
number used by the manufacturer, which controls
the design and characteristics of the item by means
of its engineering drawings, specifications, standards, and inspection requirements to identify an
item or range of items. Following the part num5
C4, TM 11-5820-765-12
her, the Federal Supply Code for Manufacturers
(FSCM) is shown in parentheses.
d. Location. The physical location of each item
listed is given in this column. The lists are designed
to inventory all items in one area of the major
item before moving on to an adjacent area.
e. Usable on Code. Not applicable.
f. Quantity Required (Qty Reqd). This column
lists the quantity of each item required for a com
plete major item.
g. Quantity. This column is left blank for use
during an inventory. Under the Rcvd column, list
the quantity you actually receive on your major
item. The Date columns are for your use when
you inventory the major item.
SECTION II INTEGRAL COMPONENTS OF END ITEM
1-1
1-1
SECTION Ill BASIC ISSUE ITEMS
6
C4, TM 11-5820-765-12
By Order of the Secretary of the Army:
Official:
ROBERT M. JOYCE
Major General, United States Army
The Adjutant General
JOHN A. WICKHAM JR.
General, United States Army
Chief of Staff
DISTRIBUTION:
To be distributed in accordance with DA Form 12-51, Operator’s Maintenance requirements for
PP-4763/GRC.
Changes In force: C2 and C3
TM 11-5820-765-12
*C3
CHANGE
HEADQUARTERS
DEPARTMENT OF THE ARMY
WASHINGTON , DC, 18 September 1980
No. 3
OPERATOR’S AND ORGANIZATIONAL MAINTENANCE MANUAL
POWER SUPPLIES PP-4763/GRC (NSN 5820-00-937-7690)
AND
PP-4763A/GRC (NSN 5820-00-113-9768)
This Change current as of 15 April 1980.
TM 11-5820-765-12, 28 October 1968, is changed
as follows:
Page C-1. Appendix C is superseded as follows:
APPENDIX C
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
C-1. General
This appendix provides a summary of the
maintenance operations for PP-4763/GRC and
PP-4763A/GRC. It authorizes categories of
maintenance for specific maintenance functions
on repairable items and components and the
tools and equipment required to perform each
function. This appendix may be used as an aid in
planning maintenance operations.
C-2. Maintenance Function
Maintenance functions will be limited to and
defined as follows:
a. Inspect To determine the serviceability of
an item by comparing its physical, mechanical,
and/or electrical characteristics with established standards through examination.
b. Test. To verify serviceability and to detect
incipient failure by measuring the mechanical
or electrical characteristics of an item and
comparing those characteristics of an item and
comparing those characteristics with prescribed
standards.
c. Service. Operations required periodically to
keep an item in proper operating condition, i.e.,
to clean (decontaminate), to preserve, to drain,
to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.
d. Adjust To maintain, within prescribed
limits, by bringing into proper or exact position,
or by setting the operating characteristics to the
specified parameters.
e. Align. To adjust specified variable elements
of an item to bring about optimum or desired
performance.
f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring and diagnostic
equipments used in precision measurement.
Consists of comparisons of two instruments, one
of which is a certified standard of known
accuracy, to detect and adjust any discrepancy
in the accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or
fixing into position an item, part, module
(component or assembly) in a manner to allow
the proper functioning of the equipment or
system.
h. Replace. The act of substituting a serviceable like type part, subassembly, or module
(component or assembly) for an unserviceable
counterpart.
i. Repair. The application of maintenance
services (inspect, test, service, adjust, align,
calibrate, replace) or other maintenance actions
(welding, grinding, riveting, straightening,
facing, remachining, or resurfacing) to restore
serviceability to an item by correcting specific
damage, fault, malfunction, or failure in a part,
1
subassembly, module (component or assembly),
end item, or system.
j. Overhaul. T h a t m a i n t e n a n c e e f f o r t
(service/action) necessary to restore an item to a
completely serviceable/operational condition as
prescribed by maintenance standards (i.e.,
DMWR) in appropriate technical publications.
Overhaul is normally the highest degree of
maintenance performed by the Army. Overhaul
does not normally return an item to like new
condition.
k. Rebuild. Consists of those services/actions
necessary for the restoration of unserviceable
equipment to a like new condition in accordance
with original manufacturing standards. Rebuild is the highest degree of materiel maintenance applied to Army equipment. The rebuild
operation includes the act of returning to zero
those age measurements (hours, miles, etc.)
considered in classifying Army equipments/
components.
C-3. Column Entries
a. Column 1, Group Number. Column 1 lists
group numbers, the purpose of which is to
identify components, assemblies, subassemblies, and modules with the next higher
assembly.
b. Column 2, Maintenance Category. Column 2
contains the noun names of components, assemblies, subassemblies, and modules for which
maintenance is authorized.
c. Column 3, Maintenance Functions. Column
3 lists the functions to be performed on the item
listed in column 2. When items are listed without
maintenance functions, it is solely for purpose of
having the group numbers in the MAC and
RPSTL coincide.
d. Column 4, Maintenance Category Column 4
specifies, by the listing of a “work time” figure in
the appropriate subcolumn(s), the lowest level of
maintenance authorized to perform the function listed in column 3. This figure represents
the active time required to perform that maintenance function at the indicated category of
maintenance. If the number or complexity of the
tasks within the listed maintenance function
vary at different maintenance categories, appropriate “work time” figures will be shown for
each category. The number of task-hours
specified by the “work time” figure represents
the average time required to restore an item
(assembly, subassembly, component, module,
2
end item or system) to a serviceable condition
under typical field operating conditions. This
time includes preparation time, troubleshooting
time, and quality assurance/quality control time
in addition to the time required to perform the
specific tasks identified for the maintenance
functions authorized in the maintenance allocation chart. Subcolumns of column 4 are as
follows:
C - Operator/Crew
O - Organizational
F - Direct Support
H - General Support
D - Depot
e. Column 5, Tools and Equipment. Column 5
specifies by code, those common tool sets (not
individual tools) and special tools, test, and
support equipment required to perform the
designated function.
f. Column 6, Remarks. Column 6 contains an
alphabetic code which leads to the remarks in
section IV, Remarks, which is pertinent to the
item opposite the particular code.
C-4. Tool and Test Equipment Requkements (Sec. Ill)
a. Tool or Test Equipment Reference Code. The
numbers in this column coincide with the
numbers used in the tools and equipment
column of the MAC. The numbers indicate the
applicable tool or test equipment for the maintenance functions.
b. Maintenace Category, The codes in this
column indicate the maintenance category
allocated the tool or test equipment.
c. Nomenclature. This column lists the noun
name and nomenclature of the tools and test
equipment required to perform the maintenance functions.
d. National/NATO Stock Number. This column
lists the National/NATO stock number of the
specific tool or test equipment.
e. Tool Number. This column lists the manufacturer’s part number of the tool followed by
the Federal Supply Code for manufacturers
(5-digit) in parentheses.
C-5. Remarks (Sec. IV)
a. Reference Code. This code refers to the
appropriate item in section II, column 6.
b. Remarks. This column provides the required explanatory information necessary to
clarify items appearing in section II.
TM 11-5820-765-12
SECTION II MAINTENANCE ALLOCATION CHART
FOR
POWER SUPPLIES PP-4763/GRC AND PP-4763A/GRC
00
01
3
TM 11-5820-765-12
SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS
FOR
POWER SUPPLlES PP-4763/GRC AND PP-4763A/GRC
4
TM 11-5820-765-12
SECTION IV.
REMARKS
5
By Order of the Secretary of the Army:
Official:
E. C. MEYER
General, United States Army
Chief of Staff
J. C. PENNINGTON
Major General, United States Army
The Adjutant General
DISTRIBUTION:
To be distributed in accordance with DA Form 12-51, Operator maintenance requirements
for PP-4763/GRC.
6
TM 11-5820-765-12
TECHNICAL MANUAL
NO. 11-5820-765-12
HEADQUARTERS
DEPARTMENT OF THE ARMY
W A S H I N G T O N, D.C., 28 October 1968
Operator and Organizational Maintenance Manual
POWER SUPPLIES PP-4763/GRC AND PP-4763/GRC
Paragraph
CHAPTER 1.
Section I.
II.
CHAPTER 2.
Section I.
II.
III.
CHAPTER
3.
CHAPTER 4.
CHAPTER 5.
Section I.
II.
APPENDIX A.
B.
C.
AGO 6196A
INTRODUCTION
General
Scope-----------------------------------------------------------------------------------1-1
Indexes of publications-------------------------------------------------------------------l-2
Forms and records -------------------------------------------------------------- 1-3
Description and data
Purpose and use----------------------------------------------------------------------------1-4
Technical characteristics -----------------------------------------------------------------1-5
Description of Power Supplies
PP-4763/GRC and
PP-4768A/GRC--------------------------------------------------------------1-6
INSTALLATION AND OPERATING INSTRUCTIONS
Service upon receipt of equipment
Unpacking------------------------------------------------------------------------2-1
Checking unpacked equipment--------------------------------------------------------2-2
Installation instructions
Suitable location------------------------------------------------------------------------2-3
Connections----------------------------------------------------------------------2-4
Operation
Operating control and indicators-----------------------------------------------------2-5
Preliminary operating procedure-----------------------------------------------------2-6
Operating procedure--------------------------------------------------------------------2-7
Stopping procedure ----------------------------- ------------------------------- 2-8
OPERATOR’S MAINTENANCE
Scope of operator's maintenance-------------------------------------------------- 3-1
Materials
required--------------------------------------------------------------------------3-2
Operator’s preventive maintenance---------------------------------------------------3-3
Operator’s preventive maintenance checks and services periods------3-4
Operator’s daily preventive maintenance checks and services chart-----3-5
Operator’s weekly preventive maintenance checks and services chart.-3-6
Cleaning--------------------------------------------------------------------3-7
ORGANIZATIONAL MAINTENANCE
Scope of Organizational maintenance-----------------------------------------------4-1
Test equipment tools and materials required------------------------------------ 4-2
Organizational monthly maintenance-----------------------------------------------4-3
Organizational monthly preventive maintenance checks and services
chart------------------------------------------------------------------------------------4-4
Touchup
painting--------------------------------------------------------------------------4-5
SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO
PREVENT ENEMY USE
Shipment and limited storage
Disassembly and repacking of equipment---------------------------------------- 5-1
Repackaging-------------------------------------------------------------------------------5-2
Demolition of materiel to prevent enemy use
Authority for demolition-----------------------------------------------------------------5-3
Methods of destruction-------------------------------------------------------------------5-4
REFERENCES-----------------------------------------------------------------------BASIC ISSUE ITEMS------------------------------------------------------------------------MAINTENANCE
ALLOCATION------------------------------------------------------------------------------
Page
1-1
1-1
1-1
1-1
1-1
1-2
2-1
2-1
2-3
2-3
2-5
2-5
2-5
2-5
3-1
3-1
3-1
3-1
3-1
3-2
3-2
4-1
4-1
4-1
4-1
4-2
5-1
5-1
5-1
5-1
A-1
B-1
C-l
i
Figure 1-1. Power Supplies PP-4763/GRC and PP-4763A/GRC.
CHAPTER 1
INTRODUCTION
Section I.
1-1. Scope
a. This manual describes Power Supplies
PP-4763/GRC and PP-4763A/GRC (fig. l-l)
and provides instructions for their installation,
operation, and maintenance. It includes instructions for cleaning and inspection of the
equipment, and touchup painting instructions.
b. The basic items issue list (BIIL) appears
in appendix B.
c. The maintenance allocation chart (MAC)
appears in appendix C.
d. Appendixes B and C are current as of 15
October 1968.
e. Throughout this manual, Power Supplies
PP-4763/GRC and PP-4763A/GRC are referred to as power supp1y, except when a specific model is cited.
1-2. Indexes of Publications
a. DA Pam 310-4. Refer to the latest issue of
DA Pam 310-4 to determine whether there are
new editions, changes, or additional publications pertaining to the equipment.
b. DA Pam 310-7. Refer to the latest issue of
DA Pam 310-7 to determine whether there are
modification work orders (MWO’S) pertaining
to the equipment.
GENERAL
1-3. Forms and Records
a. Reports of Maintenance and Unsatisfactory Equipment. Use equipment forms and records in accordance with instructions given in
TM 38-750.
b. Report of Packing and Handling Deficiencies. Fill out and forward DD Form 6 (Report of Packaging and Handling Deficiencies)
as prescribed in AR 700-58 (Army), NAVSUP
Pub 378 (Navy), AFR 71-4 (Air Force), and
MCO 4030.29 (Marine Corps).
c. Discrepancy in Shipment Report (DISREP) (SF 861). Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361)
as prescribed in AR 55-38 (Army), NAVSUP
Pub 459 (Navy), AFM 75-34 (Air Force), and
MCO P4610.19 (Marine Corps).
d. Report of Equipment Manual Improvements. Report of errors, omissions, and recommendations for improving this publication by
the individual user is encouraged. Reports
should be submitted on DA Form 2028 (Recommended Changes to DA Publications) and
forwarded direct to Commanding General, U.S.
Army Electronics Command, ATTN: AMSEL
-ME-NMP-AD, Fort Monmouth, N.J. 07703.
Section II. DESCRIPTION AND DATA
1-4. Purpose and Use
Power Supply PP-4763/GRC converts 115
volts alternating current (at) to direct current
(dc) at a selected regulated voltage. Power
Supply PP-4763A/GRC converts either 115 or
230 volts ac to direct current at a selected regulated voltage. The power supplies function
in a similar way; both provide a dc power
AGO 6196A
source for communication equipment or any
type of load with requirements within their
voltage and current ratings.
1-5. Technical Characteristics
Power input:
Voltage --------------- 115 volts ±10% at 47 to
63 cps.(PP-476S/GRC).
115 volts ±10% at 47 to
1-1
63 cps, or 230 volts
±10% at 47 to 68 cps
(PP-4763A/GRW).
Phase ----------------- Single.
Current (full load) ---- 23 amperes (PP-4763/
GRC).
23 amperes (PP-4763A/
GRC at 116 volt input).
11.5 amperes (PP-4763A/
GRC at 280 volt input).
Power output:
Voltage---------------
Variable from 27 to 20
volts dc (28-volt operation).
Current (full load)---------- 60 amperes, continuous
Ripple voltage------------- 1.0% (root mean square).
Voltage regulation-------- ±0.5%
Surrounding operating
temperature -------------- -4°F o(-20°C) to 131°F
(55 C).
Meters:
0 to 80 amperes
Output current meter,
type MR36W080DCAAR
0 to 60 volts
Output voltage meter,
type MR36W050DCVVR
Solid-state devices
Semiconductor device,
diode:
PP-4763/GRC------- 16 ea.
PP-4763A/GRC------ 24 ea.
Transistor------------4 ea.
Semiconductor device,
controlled rectifier --- 3 ea.
Rectifier, semiconductor
device:
PP-4763/GRC------- 2 ea.
PP-4763A/GRC--------- None.
1-6. Description of Power Supplies
PP4763/GRC and PP4763A/GRC
(fig. l-l)
a. Phyiscal Description. The power supply is
a self-contained unit in a metal cabinet
PP-4763/GRC is 13½ inches high, 19½
inches wide, and 14¾ inches deep and weighs
120 pounds. PP-4763A/GRC is 13½ inches
1-2
high, 19½ inches wide, and 15¼ inches deep
and weighs 125 pounds. A hinged front panel
and a removable cover provide access to the
electrical components. The PP-4763A/GRC is
provided with an interlock switch which open
the ac input power circuit when the cover is removed. An input circuit breaker and indicator
are mounted on the front panel. A carrying
handle is mounted on each side of the metal
cabinet. An output voltage adjustment is
mounted behind the front panel and can be
reached by removing a plate on the outside of
the front panel. The PP-4763A/GRC is provided with movable links for converting the
equipment for use from a 116-volt ac power
source to a 230-volt ac power source. The links
can be reached by removing the cover. The
sides of the cabinet are flanged on the bottom
and at the back for mounting purposes. Venting is provided by air louvers on the bottom
and on the top cover of the cabinet An ac
power cable (fig. 2-2) is connected through the
rear panel of the power supply. The
PP-4763A/GRC is supplied with an ac plug ab
tached to the cable, and the PP4763/GRC is
supplied with a cable that has three terminal
lugs on each end. Output terminals (dc) with
polarity plainly marked are located behind an
access plate at the rear panel for connecting
the output of the power supply to the equipment being powered (cable not supplied). Also,
the PP-4763A/GRC is provided with a dc out
put receptacle at the rear panel which may be
used instead of the output terminals for connecting to equipment being powered.
b. Solid-State Devices. The power supplies
are solid-state controlled devices. Automatic
and continuous regulation of voltage within
the limits specified under technical characteriatics (para 1-5) is accomplished by a control
circuit built into printed card PC101.
CHAPTER 2
INSTALLATION AND OPERATING INSTRUCTIONS
Section I. SERVICE UPON RECEIPT OF EQUIPMENT
2-1. Unpacking
a. Packaging Data. When packed for shipment, Power Supply PP-4763/GRC is packed
in a 24¾ by 21¾ -by 17¼ -inch wooden box.
The volume is 5.4 cubic feet, and the total
shipping weight is 193 pounds. The PP-4763A/
GRC is packed in a 24¾ -by 22¼ -by 17¼-inch
box. The volume is 5.5 cubic feet, and the total
shipping weight is 200 pounds. A typical
wooden box and its contents are shown in
figure 2-1.
b. Removing Contents. Follow the procedure
outlined below when unpacking the equipment.
(1) Remove the nails that secure the plywood box to the wooden base. Lift the box free
of the unit and the base.
(2) Remove the bolts that fasten the
power supply to the base.
(3) Lift the power supply clear of the
base.
(4) Remove the fitted corrugated wrapping paper from the power supply.
2-2. Checking Unpacked Equipment
a. Inspect the equipment for damage that
may have incurred during shipment. If the
equipment has been damaged, refer to paragraph 1-3 for applicable forms and records.
b. Check to see that the equipment is complete as listed on the packing slip. If a packing
slip is not available, check the equipment
against the basic issue items list (appx B). Report all discrepancies in accordance with TM
33-750. The equipment should be placed in service even though a minor assembly or part that
does not affect proper functioning is missing.
c. Check to see whether the equipment has
been modified. If the equipment has been modified, the MWO number will appear on the front
panel, near the nomenclature plate. Also, check
to see whether all MWO’S current at the time
the equipment is placed in use have been applied.
Note. Current MWO’s applicable to the equipment
are listed in DA PAM 810-7.
d. Check the latest issue of DA PAM 310-4
to see whether you have the latest editions of
all applicable maintenance literature.
2-1
Figure 2-1. Typical packaging.
2-2
Section II. INSTALLATION INSTRUCTIONS
2-3. Suitable location
Caution: Do not operate the equipment if
there is evidence of water inside the cabinet.
The power supply is designed to operate within
a sheltered location protected from the elements. It is not designed to operate in rain,
snow, or ice, or where surrounding temperature exceeds 55° CH.
2-4. Connections
(fig. 2-2)
Warnings:
1. The metal cabinet must be grounded at
all times when it is connected to an ac source.
The PP-4763A/GRC is grounded by the ac
power cable when the ac power cable is plugged
into an ac outlet. The ac power cable supplied
with the PP-4763/GRC includes a ground
(GRD) wire for this push The AC ON-OFF
switch must be set to OFF before the power
supply is connected.
2. Be careful when working on the 115-or
230-volt ac line connections Serious injury or
DEATH may result from contact with them
terminals,
3. Low-voltage, high-amperage current is
present at output connections and at connections inside the equipment. Do not touch connections or remove the cabinet cover until the
equipment is removed from power source. Reenergize the power supply before connecting
or disconnecting the equipment to be powered.
a. Turn the AC ON-OFF switch (fig. l-l)
to OFF.
Caution: Measure the available ac supply
voltage, to determine whether it is 115-or 230volts ac.
b. Connect the three-wire, ac power cable to
a single-phase, 115-volt, 50- to 60-cps source
when using the PP-4763/GRC. Connect the
power cable to either a single-phase 115-volt,
50- to 60-cps source, or a single-phase, 230volt, 50- to 60-cps source when using the
PP4763A/GRC. After determining which
power source will be used, secure the ac input
links in the correct position for the selected
input power as illustrated in figure 2-2. For
115-volt power, secure the links as shown in
figure 2-2; for 230-volt power, secure the links
as shown in figure 2-2. Note that in the 230volt position, both links are fastened (in parallel) across the two center terminals and secured. A connector is mounted on the power
cable to connect the PP-4763A/GRC to the ac
power supply; the power cable for the
PP4768/GRC maybe connected directly to the
ac power supply as follows:
(1) Connect the white wire to the
grounded ac terminal.
(2) Connect the black wire to the ungrounded ac terminal.
(3) Connect the GRD wire to a good earth
ground.
c. Remove the rear panel access plate to expose the dc output terminals (fig. 2-2).
Caution: Be sure to observe correct
polarity; for example (+) output terminal to
(+) load terminal; (-) output terminal to
(-) load terminal.
d. Connect two dc leads with ¼-inch lugs
capable of carrying 50-ampere current (or the
current requirements of the load connected) to
the power supply output terminals. The
PP-4763A/GRC is provided with dc output receptacle J1 at the rear panel (fig. 2-2), and either the output terminals or output receptacle
J1 may be used.
e. Replace the access panel and tighten the
cable clamps.
2-3
Figure 2-2. Installation connections.
2-4
Section Ill. OPERATION
2-5. Operating Controls and Indicators
(fig. 2-3)
Control or Indicator
AC ON-OFF switch
(two-position toggle).
Output current meter
M2.
Output voltage meter
Ml.
Dc voltage adjust
control.
Function
Serves dual function: ONOFF switch for normal
operation, and protective circuit breaker if
operating current load
exceeds safe current
load.
Indicates power supply
output current.
Indicates power supply dc
output voltage.
Permits varying output voltage of power supply
from 27 to 29 volts.
2-6. Preliminary Operating Procedure
Caution: A continuous flow of air through
the power supply is necessary during operation
to prevent damage because of overheating. Do
not obstruct the flow of air through the louvers
on the underside or the top of the equipment.
If the fan fails to operate, do not continue
operation of the equipment.
After performing the procedures given in paragraph 2-4, proceed as follows:
a. Place the AC ON-OFF switch to ON and
read the output voltage as indicated on output
voltage meter Ml (para 2-5).
b. Remove the ADJUST access plate on the
front panel (fig. 2-3).
c. With a screwdriver, turn the shaft of the
dc voltage adjust control until the output voltage meter Ml indicates the desired output voltage.
d. Check output current meter M2 indication. Output current should not exceed 50 amperes.
e. Place the AC ON-OFF switch at OFF and
replace the ADJUST access plate on the front
panel.
2-7. Operating Procedure
a. To operate the power supply, place the AC
ON-OFF switch at ON.
b. Check the output voltage at intervals during operation of the power supply. When necessary, adjust the dc voltage adjust control to
maintain the desired output voltage.
2-8. Stopping Procedure
Place the AC ON-OFF switch at OFF.
2-5
Figure 2–3. Front panel controls and indicators.
2-6
CHAPTER 3
OPERATOR’S MAINTENANCE
3-1. Scope of Operator’s Maintenance
The maintenance duties assigned to the operator of the power supply are listed below together with a reference to paragraphs covering the specific maintenance function.
a. Operator’s daily preventive maintenance
checks and services chart (para 3-5).
b. Operator’s weekly preventive maintenance
checks and services chart (para 3-6).
c. Cleaning (para 3-7).
3-2. Materials Required
a. Cleaning compound
9542) .
b. Cleaning cloth.
(FSN 7930-395-
3-3. Operator’s Preventive Maintenance
Preventive maintenance is the systematic care,
servicing, and inspection of equipment to prevent the occurrence of trouble, reduce downtime, and assure that the equipment is serviceable.
a. Systematic Care. The procedures given in
paragraphs 3-5, 3-6, and 3-7 cover routine
systematic care and cleaning essential to the
proper upkeep of the power supply.
b. Preventive Maintenance Check and Services. The preventive maintenance checks and
services charts (para 3-5 and 3-6) outline
functions to be performed at specific intervals.
These checks and services are to maintain
Army electronic equipment in a combat-serviceable condition; that is, in good general
(physical) condition and in good operating
condition. To assist operators in maintaining
combat serviceability, the chart indicates what
to check, how to check, and the normal indications; the References column lists the illustrations, paragraphs, or manuals that contain
detailed repair or replacement procedures. If
the defect cannot be remedied by the operator,
a higher category of maintenance or repair is
required. Records and reports of these checks
and services must be made in accordance with
the requirements set forth in TM 38-750.
3-4. Operator’s Preventive Maintenance
Checks and Services Periods
Paragraph 3-5 specifies checks and services
that must be accomplished daily, or under the
conditions listed below.
a. Before the power supply is put into operation.
b. When the power supply initially is inStalled.
c. When the power supply is reinstalled
after removal for any reason.
d. At least once each week if the power supply is maintained in a standby condition.
3-5. Operator’s Daily Preventive Maintenance Checks and Services Chart
Warnings:
1. Be careful when working on the 115- or 230-volt ac line connections Serious injury or DEATH
may result from contact with these terminals.
2. Low-voltage, high-amperage current is present at output connations and at connections inside equipment. Do not touch connections or remove cabinet cover until equipment is removed
from power source. Reenergize power supply before performing any maintenance.
3-1
1
2
3
Completeness --------------------
Check to see that equipment is complete.
Exterior surfaces ---------------Clean exterior surfaces, including panel
and meter glasses. Check both meter
glasses for cracks.
O p e r a t i o n - - - - - - - - - - - - - - - - - - - - - - - - Operate equipment. Output voltage and
output current meters should indicate output voltage and output current, respectively.
Appx B.
Para 3-7.
Para 2-6 and 2-7.
3-6. Operator's Weekly Preventive Maintenance Checks and Service Chart
Warnings:
1. Be careful when working on the 115-or 230-volt ac line connections Serious injury or DEATH
may result from contact with these terminals.
2. Low-voltage high-amperage current is prestmt at output connections and at connections inside equipment. Do not touch connections or remove cabinet cover until equipment is removed from
power eourah Reenergize power supply before performing any maintenance.
1
Cable
---------------------------
2
Metal
surfaces
-------------------
Inspect cable for frayed, chafed, or
cracked insulation. Replace any connector that is broken, arced, or worn
excessively.
Inspect exposed metal surface for rust
or corrosion. Clean and touchup paint
as
required.
3-7. Cleaning
The exterior surfaces of the power supply
should be free of dust, dirt, grease, and fungus.
a. Remove dust and loose dirt with a clean,
soft cloth.
Warning: Prolonged breathing of cleaning
compound is dangerous; make sure adequate
ventilation is provided. Cleaning compound is
flammable; do not use near a flame. Avoid
contact with the skin; wash off any that spills
on the hands.
b. Remove grease, fungus, and ground-in dirt
3-2
Refer to higher category
of maintenance.
Refer to higher category
of maintenance.
from the case; use a cloth dampened (not wet)
with the cleaning compound.
c. Remove dust or dirt from the plug and
jack with a cotton swab stick lightly dampened
with the cleaning compound.
Caution: Do not press on the meter face
(glass) when cleaning; the meter may become
damaged.
d. Clean the front panel, meters, and knob;
use a soft, clean cloth. If dirt is difficult to remove, dampen the cloth with water; mild soap
may be used for more effective cleaning.
CHAPTER 4
ORGANIZATIONAL MAINTENANCE
4-1. Scope of Organizational Maintenance
a. This chapter contains instructions covering organizational maintenance for the power
supply. It includes instructions for performing
preventive and periodic maintenance services
and repair functions to be accomplished by the
organizational repairman.
b. Organizational maintenance of the power
supply includes:
(1) Preventive maintenance checks and
services (para 4-4).
(2) Touchup painting (para 4-5).
4-2. Test Equipment, Tools, and Materials
Required
The test equipment, tools, and materials required for organizational maintenance of the
power supply are listed below.
a. Test Equipment. Multimeter AN/URM106 (TM 11-6625-208-12) .
b. Tool. Tool kit Electronic Equipment
TK-101/G (SM 11-4-5180-R13).
c. Materia1s.
(1) Cleaning compound (Federal stock
No. 7930-395-9542) .
(2) Cleaning cloth.
(3) Fine sandpaper (supplied with Tool
Kit, Electronic Equipment TK-101/G).
(4) Cotton swab sticks.
4-3. Organization Monthly Maintenance
Perform the maintenance functions indicated
in the organizational monthly preventive maintenance checks and services chart (para 4-4)
once each month. A month is defined as approximately 30 calendar days of 8 hour-perday operation. If the equipment is operation 16
hours a day, the monthly preventive maintenance checks and services should be performed
at 15-day intervals. Adjustment of the maintenance interval must be made to compensate for
any unusual operating conditions. Equipment
maintained in a standby (ready for immediate
operation) condition must have monthly preventive maintenance checks and services performed on it. Equipment in limited storage
(requires service before operation) does not require monthly preventive maintenance. The
daily and weekly periodic services constitute a
part of the monthly preventive maintenance
checks and services and must be performed
concurrently. All deficiencies or shortcomings
should be recorded in accordance with the requirements of TM 38-750. Perform all the
checks and services listed in the monthly preventive maintenance checks and services chart
(para 4-4) in the sequence listed.
4-4. Organizational Monthly Preventive Maintenance Checks and Service Chart
Warning:
1. Be careful when working on the 115- or 230-volt ac line connections. Serious injury or DEATH
may result from contact with these terminals.
2. Low-voltage, high-amperage current iS present at output connections and at connections inside the equipment. DO not touch connetions or remove cabinet cover until equipment is removed
from power source. Deenergize the power supply before performing any maintenance
4-1
1.
2
3
4
5
6
7
8
Installation--------------------------------
Check to see that equipment is cornAppx B.
plete.
Preservation------------------------------Check all surfaces for evidence of funPara 4-6.
gus. Remove rust and corrosion and
spot-paint bare spots.
DA Pam 310-4.
P u b l i c a t i o n s - - - - - - - - - - - - - - - - - - - - - - - - - Check to see that all publications are
complete, serviceable and current
Check DA Pam 310-7 to determine if
DA Pam 310-7.
Modidcations--------------------------new applicable MWO’S have been
published. AU URGENT MWO’S
must be applied immediately. All
NORMAL MWO’S must be scheduled.
Connections and cables--------------------- Check to be sure that connectors are
intact, clean, and tight-fitting, and
cable is in good condition, free from
cracks or deteriorated insulation.
Check cables for continuity.
ACON-OFF switch--------------------------- Check that mechanical operation of AC
ON-OFF switch is smooth and free
from internal and external binding.
Check to see that no parts or hardHardware------------------------------------ware, such as bolts, nuts, and screws
are missing.
Check to see that fan and interior of
Fan-------------------------------------------power supply is clean.
4-5. Touchup Painting
Remove rust and corrosion from metal surfaces by lightly sanding them with fine sandpaper. Brush two thin coats of paint (Enamel,
Semigloss, olive Drab FSN 8010-844-8088) on
4-2
the bare metal to protect it from further corrosion. Refer to the applicable cleaning and refinishing practices specified in TB SIG 364 and
the painting supplies available for field use in
SB 11-573.
CHAPTER 5
SHIPMENT AND LIMITED STORAGE AND DEMOLITION
TO PREVENT ENEMY USE
Section I. SHIPMENT AND LIMITED STORAGE
5-1. Dissassembly and Repacking of
Equipment
Prepare the power supply for repacking for
shipment and limited storage as follows:
a. Place the AC ON-OFF switch at OFF.
b. Remove the two dc leads that connect the
power supply output to other equipment.
c. Disconnect the ac cable.
d. Wrap the technical manual in wrapping
paper and secure it with pressure-sensitive
tape.
e. Fasten the packages that contain the cable
assembly and the technical manuals to the
power supply (fig. 2-1).
5-2. Repacking
Normally, repackaging the power supply for
shipment or limited storage will be performed
at a packaging facility or by a repackaging
team. If emergency packaging is required, select the materials from those listed in SB
38-100. Package the equipment in accordance
with the original packaging (para 2-1) sofar
as possible with the available materials.
Section II. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE
5-3. Authority for Demolition
Demolition of the equipment will be accomplished only upon order of the commander. Use
the destruction procedures outlined in paragraph 5-4 to prevent further use of the equip
ment
5-4. Methods of Destruction
The tactical situation and time available will
determine the method to be used when destruction of equipment is ordered. In most cases, it
is preferable to completely demolish some portions of the equipment rather than partially
destroy all the equipment components. Spare
parts should be destroyed with the same thoroughness as the basic equipment.
a. Smash. Smash the electronic parts, meters
and controls, and cabinet.
b. Cut. Cut the wiring and cabling of the
power supply.
c. Burn. Burn the spare parts and the technical manuals covering the equipment.
Warning: Be extremely careful with explosives and incendiary devices. Use these items
only when the need is urgent.
d. Explode. If explosives are necessary, use
grenades, TNT, or firearms.
e. Dispose. Bury or scatter destroyed parts,
including spare parts.
5-1
APPENDIX A
REFERENCES
The following is a list of applicable references that are available to the operator and organisational
repairman of the power supply.
AR 55-38 ------------- Report of Transportation Discrepancies in Shipments (Reports Control
Symbol MTMTS-54).
AR 700-58 -------- -- Report of Packaging and Handling Deficienies (Reports Control Symbol
AMC-137) .
DA Pam 310-4 ---------- Index of Technical Manuals, Technical Bulletins, Supply Manuals (types
7, 8, and 9), Supply Bulletins, and Lubrication Orders.
DA Pam 310-7 ---------- U.S. Army Equipment Index of Modification Work Orders.
SB 11-578---------------- Painting and Preservation Supplies Available for Field Use for Electronics Command Equipment.
SB 38-100 ---------------- Preservation, Packaging, and Packing Materials, Supplies, and Equipment
Used by the Army.
SM 11-4-5180-R13 -- Tool Kit, Electronics Equipment TK-101/G.
TB SIG 364--------------- Field Instructions for Painting and Preserving Electronics Command
Equipment.
TM 11-6625-203-12 ----- Operator and Organizational Maintenance Manual; Multimeter AN/URM106, Including Multimeter ME-77/U.
TM 38-750 -------Army Equipment Record Procedures.
A-1
APPENDIX B
BASIC ISSUE ITEMS
Section I. INTRODUCTION
B-1. Scope
This appendix lists items comprising an operable equipment and those required for installation, operation, or operator’s maintenance for
Power
PP-4763/GRC
and
supply
PP-4763A/GRC.
B-2. Explanation of Columns
The following is a list of explanations of columns in section II.
a. Source, Maintenance, and Recoverability
Code (SMR) Column. Not used.
b. Federal Stock Number Column. This column indicates the Federal stock number for
the item.
c. Description Column. This column includes
the Federal item name and any additional description of the item which may be required.
d. Unit of Measure Column. The unit used as
a basis of measure (e.g., ea, pr, ft, yd, etc.) is
given in this column.
e. Quantity Incorporated in Unit Column.
The quantity of the item used in the equipment
is given in this column.
f. Quantity Furnished unit Equipment Column. This column lists the quantity of the item
supplied for initial operation of the equipment
and/or the quantities authorized to be kept on
hand by the operator for maintenance of the
equipment.
g. Illustrations Column.
(1) Figure number (a). The number of
the illustration on which the item is shown is
indicated in this column.
(2) Item No. or reference designation (b).
Not used.
B-1
SECTION
II
BASIC ISSUE ITEMS
1-1
I-1
1-1
B-2
APPENDIX C
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
C-1. General
This appendix provides a summary of the
maintenance operations covered in the equipfor
Power
supply
literature
ment
PP-4763/GRC and PP-4763A/GRC. It authorizes categories of maintenance for specific
maintenance functions on repairable items and
components and the tools and equipment required to perform each function. This appendix
may be used as an aid in planning maintenance
operations.
C-2. Explanation of Format for Maintenance Allocation Chart
a. Group Number. Not used.
b. Component Assembly Nomenclature. This
column lists the item names of component
units, assemblies, subassemblies, and modules
on which maintenance is authorized.
c. Maintenance Function. This column indicates the maintenance category at which performance of the specific maintenance function
is authorized. Authorization to perform a
function at higher categories. The codes used
represent the various maintenance categories
as follows:
d. Tools and Equipment. The numbers appearing in this column refer to specific tools
and equipment which are identied by these
numbers in section III.
e. Remarks. Self explainatory.
C-3. Explanation of Format for Tool and
Test Equipment Requirements
The columns in the tool and test equipment requirements chart are as follows:
a. Tools and Equipment. The numbers in
this column coincide with the numbers used in
the tools and equipment column of the MAC.
The numbers indicate the applicable tool for
the maintenance function.
b. Maintenance Category. The codes in this
column indicate the maintenance category normally allocated the facility.
c. Nomenclature. This column lists tools,
test and maintenance equipment required to
perform the maintenance functions
d. Federal Stock Number. This column lists
the Federal stock number.
e. Tool Number. Not used
C
O
F
H
D
Operator/Crew
Organizational Maintenance
Direct Support Maintanance
General Support Maintenance
Depot Maintenance
C-1
SECTON II.
C-2
SECTION III.
C-3
By Order of the Secretary of the Army:
Official:
KENNETH G. WICKHAM,
Major General, United States Army,
The Adjutant General
WILLIAM C. WESTMORELAND,
General, United States Army,
Chief of Staff.
Distribution:
To be distributed in accordance with DA Form 12-61 Organization maintenance literature
requirements for AN/GRC-106, AN/GRC-122, AN/GRC-142 and AN/VSC-2 radio sets.
U. S. GOVERNMENT PRINTING OFFICE : 1 9 8 7 - 201-421 (70877)
PIN : 030807-004
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