TM-9-6920-430-14
COOLANT RECHARGING UNIT, TRAINING GUIDED MISSILE SYSTEM M80 AND CHARGER, BATTERY PP-7309/T
TECHNICAL MANUAL; OPERATOR’S AND ORGANIZATIONAL DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL
AUGUST 1980
TM-9-6920-430-14 - Page 25 of 180
TM 94920-430-14
1-14. BATTERY TEST CIRCUIT (Figure 1-8).
This circuit is provided to check the
charge/discharge condition of the trainer batteries. Each battery is individually tested by placing the
appropriate CHARGE/OFF/TEST switch in the test position and holding in position momentarily.
The green lamp will illuminate if the battery under test is maintaining a proper charge (42±2 VDC).
Test connections for the five CHARGE/OFF/TEST switches S2-S6 are similar; thus only switch S2
for battery 1 will be discussed. Placing the CHARGE/OFF/TEST switch in the TEST position
connects load resistors A1R21-29 across the negative side of the battery under test and the input
terminal of voltage amplifier A1U1A. If the differential voltage sensed by resistor network A1R20-
21-29 is correct, AIU1A amplifies the input signal to drive A1Q4 causing A1Q4 to conduct and
illuminate TEST lamp A1DS7. A discharged battery will not provide the required bias voltage to
drive voltage amplifier A1U1A.
Figure 1-8. Battery Test Circuit, Partial Schematic Diagram
Change 2
1-17/ (1-18 blank)
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