DATA MODE Switch Si Wiring Check.

TM 9-4931-378-l3&P

i. DATA MODE Switch Si Wiring Check. Check

Read continuity to the following points.

(2)

switch SI and associated wiring by performing the

Pin patterns of J3, J4 and J5 are shown in

following procedure:

figure 5-6. (See table 5-4, 20.)

TP2 (19)

J3-3

J4-34

J4-55

Ensure DV negative lead connected to

(1)

J4-66

J3-6

J4-35

TP6 (15)

TP4 (17, figure 2-1).

J4-36

TP12 (43)

J3-8

J5-2 (34)

(2)

Connect DVM positive lead to XA2-47

J3-10

J4-43

J5-7

J1-B (44)

(figure 5-8).

J4-5 (36)

J3-1 (38)

Set DATA MODE Switch S1 (4, figure

(3)

2-1) to CONT.

Connect jumper between J4-27 (36) and

(3)

Read continuity on DVM (See table 5-4,

(4)

J4 36.

17.)

(4)

Set OUTPUT SEL 2 Switch S10 (12) to

5V.

Set DATA MODE Switch S1 (4) to

(5)

Read continuity between TP4 (17) and

(5)

HOLD.

TP8 (13).

Read open circuit on DVM (See table 5-4,

(6)

Using DVM, read continuity between the

18.)

following pairs of pins. Pin patterns of J3,

Connect DV M positive lead to XA2-48

(7)

J4 and J5 are shown in figure 5-6. (See

(figure 5-8.)

table 5-4, 21.)

Set DATA MODE Switch S1 (4, figure

(8)

(6A) Remove jumper connected in step (3).

2-1) to RPT.

Read continuity on DVM (See table 5-4,

(9)

From (figure 5-8)

To (figure 2-1)

17. )

XA3-90

J4-1 (36)

Set DATA MOD E

Switch S1 (4) to

(10)

XA3-23

J5-1 (34)

HOLD.

XA1-48

J3-12 (38)

Read open circuit on DVM (See table 5-4,

(11)

XA1-97

J4-51 (36)

18.)

XA1-38

J4-64 (36)

XA1-88

J4-64 (36)

(7) Using DVM, read between 9.8 kilohms

DATA WD SEL Switch S8 Wiring Check. Check

and 10.2 kilohms between the following

switch S8 and associated wiring by performing the

pairs of connector J4 (36) pins: (See

following procedure:

table 5-4, 21).

(1] Ensure DVM negative lead connected to

TP4 (17).

From

( 2 ) Set DATA WD SEL Switch S8 (22) to

each of the following positions and read

continuity to the designated Connector

XA2 (figure 5-8) pin. (See table 5-4, 19.)

Turn panel/chassis front panel up with

(8)

bottom toward test personnel.

XA2 Pin

S8 Position

Read continuity from TP4 (17) to W1

(9)

TAIR

(18, figure 5-9).

VDW

(lo)

Return chassis/panel to the upright posi-

STAT 1

tion.

PABS

STAT 2

Reinstall CCA's 1A1 through 1A3 in ac-

(11)

cordance with Chapter 6.

k. Chassis Wiring Check. Check the remaining chas-

5-12. Active Checkout. The following procedures func-

sis wiring by performing the following procedure:

tionally check the portions of the test set which can be

(1) Connect DVM negative lead to TP4 (17,

operated without the airborne equipment. These proce-

figure 2-1.)

dures will require an oscilloscope in addition to the DVM.

5-15