Figure 2-1. Control panel test board and components assembly A4, simplified schematic diagram.

TM 11-6760-238-34

diode CR1. Zener diode CR1 functions to regulate the

CR3 produce + 13-volt dc and + 6.8-volt dc regulated

input + 28-volt dc power to a + 2(0volt dc level which is

outputs respectively. Regulated + 6.8-volt dc output

applied to the base of series regulator transistor Q1

power is applied through variable resistor R6 to voltage

Resistor R1 serves as a zener diode current limiting

divider networks consisting of resistors R7, R8, R10 and

resistor while capacitor C1 functions as a filter capacitor.

R11. Adjustment of variable resistor R6 determines the

Series regulator transistor Q1 produces regulated + 20-

magnitude of positive voltage applied to the voltage

volt dc output which is applied to filter capacitor C2 and

divider networks.

(2) -6.2 V dc power supply. The -6.2-volt dc

zener diode networks comprised of resistors R2, R3 and

diodes CR2, CR3 Resistors R2 and R3 serve as diode

power supply circuitry consists of rectifiers CR4 and

current limiting resistors while zener diodes CR2 and

CR5, capacitors C3 and C4, resistors R4 and R5, and

2-3