MTD 464 Betriebsanleitung PDF herunterladen (Seite 217)

ARMY TM 9-6115-464-34

AIR FORCE TO 35C2-3-445-2

NAVY NAVFAC P-8-624-34

(9)

(10)

(11)

Repair wiring harness as follows: If the wiring harness has sustained damage and requires repair or

rebuild, refer to figures 3-69 (50/60 Hz) or 3–70 (400 Hz) as required for layout identification and

material requirements and Appendix A for detailed soldering and replacement procedures.

Test and replace printed circuit board components using figures 3-71, 3–72, 3-73,3-74, and 3-75

as appropriate.

If any soldered component on the printed circuit board must be replaced, refer to Appendix A for

detailed soldering and replacement procedures.

f. Assembly.

(1) Assemble governor control unit in reverse order of removal procedures using figure 3-68 as a guide.

NOTE

Prior to installing assembled governor control unit in housing and pouring potting

compound, perform tests (subparagraph g.) below.

(2) After completing assembly, repeat tests g.(2), (3), (4) (checks only) (5) and (6).

(3) After final assembly, use an ohmmeter to check for open circuit between each pin on all connectors

and each test point and the governor control unit housing. There shall be no sign of continuity.

g. Testing.

CAUTION

Unpotted governor control unit printed circuit board must be positioned as specified in

step (1) below. Failure to observe this caution could result in damage to the

equipment.

(1) Position governor control unit printed circuit board as shown in figure 3-76.

(2) Perform resistance test as follows:

(a) Turn potentiometers (R11, R12, R14, R15, R16 and R18, figure 3-68) to the full clockwise position.

(b) Preset adjustable resistors (R2 and R10, figure 3-71) to mid-range.

test values are given in table 3-6).

NOTE

Observe polarity of connections specified in the table. Return potentiometer to

clockwise position after each check.

(3) Perform magnetic amplifier bias test as follows:

(a)

(b)

(c)

(d)

Install governor control unit in test circuit illustrated

NOTE

in figure 3-77.

Frequency of power source (G1) must conform to frequency of governor control unit

being tested (50/60 Hz or 400 Hz).

Turn potentiometers R11, R12, R14, R15, R16, and R18 to full clockwise position.

Adjust R11 and R12 to obtain a balanced reading of 450 milliamperes on M2 and M3.

Turn R12 to full clockwise. Reading of M2 and M3 shall be O to 300 milliamperes and shall be

balanced within 50 milliamperes.

3-163

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