TM 11-6625-2980-14
TM 503 SYSTEM MAINTENANCE
Section III. GENERAL
Introduction
This section of the manual is meant to support the
entire TM 500 Series family of modules with a general
coverage of the most commonly-needed service
information pertinent to preventive maintenance,
troubleshooting, ordering parts, and replacing
components and sub-assemblies.
Cabinet Removal
Dangerous potentials exist at several points
throughout the system. When the system must
be operated with the cabinet removed, do not
touch exposed connections or components.
Some transistors have voltages present on
their cases. Disconnect power before cleaning
the system or replacing parts.
Two screws on the top secure the cabinet to the TM
503 frame. Remove them and lift the cabinet straight
up. Do not operate the system with the cabinet
removed any longer than necessary for troubleshooting
and calibration. Re-install the cabinet to protect the
interior from dust and to remove personnel shock
hazards.
Cleaning
Adequate ventilation should be provided while
using TRICHL ORO TRIFL UO ROE THA NE.
Prolonged breathing of vapor should be
avoided. The solvent should not be used near
heat or open flames; the products of
decomposition are toxic and irritating. Since
TRICHLORO TRIFLUOROETHANE 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.
Exterior. Loose dust may be removed with a soft
cloth or a dry brush. Water and a mild detergent may be
used; however, abrasive cleaners should not be used.
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. Compressed air shall not
be used for cleaning purposes except where
reduced to less than 30 p.s.i.f. and then only
with effective chip guarding and personnel
protective equipment. Do not use compressed
air to dry parts when trichlorotrifluoroethane
has been used.
Interior. Cleaning the interior of a unit should
precede calibration since the cleaning processes could
alter the settings of calibration adjustments. Use low-
velocity compressed air to blow off accumulated dust.
Hardened dirt can be removed with a soft, dry brush,
cotton-tipped swab, or a cloth dampened in a solution of
water and mild detergent.
Preventive Maintenance
Preventive maintenance steps performed on a
regular basis will enhance the reliability of the
instrumentation system. However, periodic checks of the
semiconductors in the absence of a malfunction are not
recommended as preventive maintenance measures.
See the semiconductor checking information under
Troubleshooting Techniques which follow. A convenient
time to perform preventive maintenance is just before
instrument calibration.
Calibration
To insure accurate signal generation and
measurement, the performance of individual units
comprising the system should be checked periodically.
Refer to TB 11-6625-2980-35 for complete calibration
procedures.
A-7
Summary of Contents for PG 508
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Page 51: ... BACKSIDE TRANSITION TIMING BOARD Α3 ...
Page 53: ...HIGH LOW LEVEL LEVEL Trigger Generator PG 508 ...
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Page 93: ...M30603 Change Reference DESCRIP riON LEVEL CONTROL MULTIPLIER Partial ...
Page 100: ...TM 11 6625 2980 14 Figure 1 0 Pulse generator AN USM 359A vi ...
Page 145: ...TM 11 6625 2980 14 POWER MODULE INTERFACE PIN ASSIGNMENTS FRONT VIEW A 15 ...
Page 146: ...TM 11 6625 298014 DETAILED BLOCK DIAGRAM A 16 ...
Page 165: ...TM 11 6625 2980 14 FO 2 Block Diagram 4 3 4 4 blank ...
Page 166: ...TM 11 6625 2980 14 FO 3 Input circuit schematic diagram 4 5 4 6 blank ...
Page 167: ...TM 11 6625 2980 14 FO 4 Period generator schematic diagram 4 7 4 8 blank ...
Page 168: ...TM 11 6625 2980 14 FO 5 Delay generator schematic diagram 4 9 4 10 blank ...
Page 170: ...TM 11 6625 2980 14 FO 7 Transition time generator schematic diagram 4 13 4 14 blank ...
Page 171: ...TM 11 6625 2980 14 FO 8 Level control multiplier schematic diagram 4 15 4 16 blank ...
Page 172: ...TM 11 6625 2980 14 FO 9 Output amplifier schematic diagram 4 17 4 18 blank ...
Page 173: ...TM 11 6625 2980 14 FO 10 Tracking voltage supply schematic diagram 4 19 4 20 blank ...
Page 174: ...TM 11 6625 2980 14 FO 11 PG 508 power supply schematic diagram 4 21 4 22 blank ...
Page 175: ...TM 11 6625 2980 14 FO 12 TM 503 power supply schematic diagram 4 23 4 24 blank ...
Page 176: ...TM 11 6625 2980 14 FO 13 A2 board component locations 5 3 5 4 blank ...
Page 177: ...TM 11 6625 2980 14 FO 14 A3 board component locations 5 5 5 6 blank ...
Page 178: ...TM 11 6625 2980 14 FO 15 A4 board component locations 5 7 5 8 blank ...
Page 179: ...TM 11 6625 2980 14 FO 16 PG 508 exploded view 5 9 5 10 blank ...
Page 180: ...TM 11 6625 2980 14 A 17 A 18 blank ...
Page 181: ...TM 11 6625 2980 14 TM 503 POWER MODULE A 23 A 24 blank ...
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