 |
|||
|
|
|||
|
Page Title:
Main unit, with tuning unit 1 interconnected by test harness (fig. 46). (cont) |
|
||
| ||||||||||
|
|  Correction
Probable
trouble
Step
Symptom
Check coils with ohmmeter; replace
Open coil or dirty contacts of
if open or short circuited.
relays K701 and K702 (fig. 52).
Check with ohmmeter for continuity;
Defective attenuators AT701 or
replace if open circuit is indica-
AT702 (fig. 52).
ted.
C h e c k resistors with ohmmeter;
Open resistor in impulse gener-
r e p l a c e if necessary.
ator output control networks
S707 and S708 (fig. 53).
R e p l a c e impulse generator.
Impulse generator G701 inoper-
ative (fig. 51).
Check continuity of all conductors
Defective test harness (fig. 39).
i n test harness, with ohmmeter;
(Disconnect test harness for
r e p a i r or replace, if necessary.
this test. )
Check potentiometer R701 and
Defective VOLUME control R701
replace if defective.
Defective resistor or capacitor in
Use voltohmmeter to make voltage
first audio amplifier stage
a n d resistance measurements to
V701A. Defective V701.
locate defective part (fig. 41).
Check V701 (fig. 52).
Defective coupling capacitor C703
Check capacitor for short or open
and replace if defective.
Defective voltage regulators
Check regulators V706, V707,
V706, V707, and V709 (fig. 51
and V709.
and 52) .
Defective resistor R707 or capac-
Use voltohmmeter to make voltage
itor C704 in second audio am-
a n d resistance measurements to
plifier stage V701B (fig. 41).
locate defective part, and
replace.
Open primary or secondary of
Use ohmmeter to check windings,
audio output transformer T701
and replace if defective.
Defective component in filter
Check components in filter FL701
FL701.
4
Audio heard in headset, but no indi
Defective meter cathode follower
Use ohmmeter to check resistors,
cation on meter with function
resistors R712 through R719,
a n d replace defective resistor.
switch at any position.
o r meter multiplier resistors
Check V702 (fig. 52).
R723 and R724 (fig. 53), and
R725 (fig. 10). Defective V702.
Defective switch S702 (fig. 53) --
Clean and repair or replace switch.
Defective component in filter
Check components in filter FL702
FL702.
Defective jack J704 ------------
Use ohmmeter to check continuity.
If defective, replace filter
FL702 (fig. 55).
Defective meter M701 (fig. 53) --
Check by plugging in remote meter
to RECORDER EXT METER
jack J704. if remote meter
o p e r a t e s , replace main unit
meter M701.
5
Meter indications are present with
Open rf choke L711 in fiIter box
Remove filter box cover (fig. 51),
function switch at CW PEAK,
assembly (fig. 45).
disconnect power, and check
PULSE PEAK, and METERED
L711 for continuity. Replace if
SLIDEBACK, but not at CW
open circuited.
AVERAGE.
Shorted feedthru capacitpr C751
Check for infinite resistance from
protruding terminal of C751 to
p o w e r to electrometer relays
chassis ground. Remove cause of
K1 and K2.
grounding center conductor of
f e e d t h r u capacitor.
Defective section Z of function
Clean and repair S702, section Z,
(front) or replace defective
switch.
Meter indications are present with
6
Shorted section Z of function
Clean and repair S702 section Z
function switch at CW AVERAGE,
(front), or replace defective
PULSE PEAK, and METERED
improperly applying 6.3-volt ac
switch.
SLIDEBACK, but not at CW
p o w e r to electrometer relays
PEAK.
K1 and K2 (fig. 59). (In this
switch position (fig. 8), K1 and
K2 must be deenergized.)
109
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals