Standard Day

TB 9-4920-454-35

R71 TP6

R67 R63 R64 TP4 R59

R26 TP1

TP3

R41

R44

R45

Figure 6. Tachometer circuit board.

(3) Adjust R41 (fig. 6) for .0 on % RPM indicator (R).

(4) Adjust R44 and R45 (fig. 6) for 100 on % RPM indicator (R).

(5) Repeat a (l) through (11) above until no further adjustments are required.

11. Standard Day

a. Performance Check

(1) Set STD DAY switch to ON and TEMPERATURE switch to OPERATE.

(2) Connect equipment as shown in figure 7.

(3) Adjust oscillator for a 1.0 V, 70 Hz (14.286 ms) output. (Note: Set up 1.0 V

output with multimeter.)

(4) Adjust AMB TEMP (oF) control to 49. If % RPM indicator does not indicate

between 100.4 and 101.3, perform b (l) and (2) below.

(5) Adjust AMB TEMP (oF) control to -41. If % RPM indicator does not indicate

between 110.7 and 111.7, perform b (3) below.

(6) Adjust AMB TEMP (oF) control to 139. If % RPM indicator does not indicate

between 92.6 and 93.6, perform b (4) below.