Heathkit IG-4505 - Page 41

Geguratryuxir®
Page 41
TEST #1 START HERE
Is the unit completely dead (no
TIME OUT or VOLTS OUT
signals)?
Proceed
to
either
Test
#2
or
Test
#3.
YES
Does the pilot lamp light?
V7
Is
the
voltage
at
the
emitter
(E)
of
Q101
5
volts?
>
Di
the
fuse,
power
switch
(SW101)
and
pilot
lamp
PL101.
De
No
+Y/
7
Is the voltage at the collector (C) of
Q101 ~ 7 volts?
Is
there
a
4
MHz
signal
at
pin
3
of
Check
Q1,
Y1,
and
the
associated
circuitry.
IC1?
VS7
Is
there
a
2
MHz
signal
at
pin
5
of
Check
IC1
and
the
associated
circu
itry.
(C1?
Y
Is there a 1 MHz signal at pin 12 of
IC2
and
a
400
kHz
signal
at
pin
11
of IC2?
V7
for a short. circuit in
transformer wiring.
Check D7, D8, D9, and D10. Check
C103 for proper installation. Check
Is
the
voltage
at
the
base
(B)
of
Check IC2 and the associated
circuitry. Interchange IC2 with
another identical IC that works
(IC3, 4, 5, 6, or 7).
Does the signal at pin 11 of IC1
change from 2 MHz to 1 MHz to
400 kHz when the MULTIPLIER
switch (SW102) is changed from X1
to X2 to X5?
NO
NO
0
0
ie>
®>
>
>
Check the MULTIPLIER switch
(SW102) and its wiring.
VE?
Place the MULTIPLIER switch in
the X1 position. Is there a 1 MHz
Q101 5.6 volts?
Ww
4
Check
ZD102,
R103,
and
C104.
Check
Q101
and
the
shielded
cable
from
the
emitter
of
Q101
to
circuit
board
hole
LL.
signal at pin 9 of IC1?
>
Check IC1
circuitry.
and the associated
V7
Continued on Page 42