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Chapter 1. FUNCTIONING OF MAINTENANCE KIT, ELECTRONIC EQUIPMENT MK-722/URC
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TM-11-6625-623-45 Maintenance Kit Electronic Equipment MK-722/URC Manual
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Chapter 2. TROUBLESHOOTING - TM-11-6625-623-450011
C2, TM 11-6625-623-45
e. Input Jacks.  I n p u t j a c k s J 1 - K C S T A B ,
isolating transformer T1 to the rectifier circuit
consisting of diode CR1 capacitor Cl, and in-
J3-KC STAB, J4-KC STAB, J2-IF TRANS,
and J2­FREQ DIVIDER are used to bring test
ductor L1.
b. Rectifier Circuit.  The rectifier circuit
signals from the receiver-transmitter to FUNC-
TION SELECTOR switch S1B.
t a k e s the 115-volt, 400-cps input power, and
rectifies and filters it to provide a direct cur-
f. FUNCTION SELECTOR Switch S1B.
r e n t (de) input to the calibrated dc regulator
F U N C T I O N SELECTOR Switch SIB connects
c i r c u i t consisting of Zener diodes CR3 and
t h e proper input jack to FUNCTION METER
CR4.
Ml.
c. Dc Regulator circuit. The filtered dc put-
FUNC-
FUNCTION  METER  M1.
put of the rectifier circuit is applied to the dc
g.
regulator circuit which provides a constant lev-
TION
METER M1 gives indications of differ-
e l dc reference voltage to FUNCTION ME-
ences
between the reference voltage and the
TER Ml.
signal
being checked.
d. FUNCTION SELECTOR Switch S1A.
h. Dummy Microphone Circuit. T h e d u m -
FUNCTION SELECTOR Switch S1A con-
my microphone circuit is used to connect audio
n e c t s the proper reference voltage to FUNC-
tone inputs to the receiver-transmitter.
TION METER Ml.
Figure 1-1. Function test set, block diagram.
Section Ill. CIRCUIT ANALYSIS
power switch S3A, and 1/4-ampere fuse F1 to
1-6. Input Power Circuit
the primary of isolating transformer T1. One
pin of the secondary of transformer T1 is
The 115-volt, 400-cps voltage is applied
g r o u n d e d . The other pin provides alternating
t h r o u g h the power cable and connector J12,
c u r r e n t ( a c ) v o l t a g e t o t w o b r a n c h e s .  One
4

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