Heathkit IM-16 - Replacement Parts Price List

@
P"su31
Troubleshooting
Ghart
DIFFICULTY
POSSIBLE
CAUSE
Completely
inoperative in either
Line
or
Batt
position
of
the
Power
switch.
NOTE: Possible
causes I,2,3,
and4would
only
cause trouble
in
the
LINE
position
of
the
Power
switch.
1.
Power
transformer.
2.
Diode
D4.
3.
Capacitor
C4.
4, Resistor
R31,
5.
Zener
diode
Db
shorted.
6.
Meter
coil open.
7.
Transistors
Q5
and
Q6.
B.
Dead
batteries
(Batt
position
of
Power
switch
only).
Zero
control
has
no effect.
1.
FET Transistor
Q1.
2. Zero
control R19.
3. Bias
control R18
and R20
misadjusted.
4. Resistor
on
voltage divider
string, R4
through
R14.
Inaccurate
DC
readings.
1. DC
Calibration
eontrol
R26 misadjusted"
2.
Probe
switch
in wrong
position.
3.
Wrong
value
or
defective
resistor
in
the
voltage
divider
string,
R4
through R14.
AC
inoperative.
Resistor R15.
Diode Dl.
Capacitors
CL
or
C2.
Resistor
in
AC
input voltage divider R2, R3.
Resistors
in voltage divider
string
R4
through
R14.
6.
Transistors
Q2
or
Q3.
I.
2,
3.
4,
5.
AC
inoperative
(500-1500
ranges
only).
1. Diodes
D2,
D3.
2. Resistors
R2,
R3.
Inaccurate AC
readings.
1.
Probe
switch in wrong
position.
2.
AC
Calibration
control
R25 misadjusted.
Ohmmeter inoperative
or
inaccurate readings.
1.
Probe
switch in wrong
position"
2,
Transistor
Q?.
3.
Battery E2
weak.
4, Resistors in
voltage divider
string
R4
through R14.
Zero
shift when turning
Range
switch.
1.
FET
Transistor
Q1.