Huntron HTR 1005B-1 User manual

MAINTENANCE MANUAL
HUNTRON TRACKER
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Huntron Instruments, Inc. 15123 Pac f c H ghway North Lynnwood, WA 98036 [phone]
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TABLE OF CONTENTS
WARRANTY
3
I
SPECIFICATIONS
5
GENERAL DESCRIPTION
6
!
THEORY OF OPERATION
CIRCUIT DESCRIPTION
INTERNAL SET-UP AND ADJUSTMENTS 16
CHARTS AND DIAGRAMS
© COPYRIGHT 1980 — HUNTRON INSTRUMENTS INC.
I
Schematc D agram .......................
Waveforms ......................................
P.C. Board Voltages .......................
Component Parts L st ...................
Assembl es L st .............................
Schematc Rev s ons .....................
Exploded V ew of Case .................
P.C. Board Voltages .......................
Photograph of Instrument Inter or
Tr mpot Locat on Chart .................
Exter or and Interor Drawngs . . .
S gnal Secton ...................
Inverter Power Supply . . . .
Cathode Ray Tube C rcu ts
Power Supply .....................
General Informaton .................
The Test S gnal .........................
Test ng React ve Components
6
7
10
12
14
15
15
20
25
25
28
30
33
34
35
36
37
38
18
19
19
23
24
TROUBLESHOOTING
General Informat on ........
Power Supply ...................
S gnal Secton .................
Cathode Ray Tube Secton
Inverter ............................. .

3
LIMITED WARRANTY
For a perod of one year from the date of ts purchase new and undamaged from Huntron
Sales, Inc., HUNTRON INSTRUMENTS, INC. wll, wthout charge, repa r or replace, at ts
opton, ths product f found by t to be defectve n materals or workmanshp, and f returned
to HUNTRON INSTRUMENTS, INC. at ts factory, transportaton prepa d. Th s lmted
warranty s expressly cond t oned upon the product hav ng been used only n normal usage
and servce n accordance w th nstructons of HUNTRON INSTRUMENTS, INC. and not
hav ng been altered n any way or subject to msuse, neglgence or damage, and not hav ng
been repared or attempted to be repa red by anyone other than HUNTRON INSTRUMENTS,
INC. or ts author zed agent. EXCEPT FOR THE FOREGOING EXPRESS WARRANTY OF
REPAIR OR REPLACEMENT HUNTRON INSTRUMENTS, INC. MAKES NO WARRANTY OF
ANY KIND, INCLUDING BUT NOT LIMITED TO. ANY EXPRESS OR IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE, AND HUNTRON
INSTRUMENTS, INC. SHALL NOT BE LIABLE FOR ANY DAMAGES, WHETHER DIRECT OR
INDIRECT, CONSEQUENTIAL OR INCIDENTAL. FORESEEABLE OR NOT. OR OTHERWISE,
BEYOND REPAIR OR REPLACING THIS PRODUCT.
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HTR 1005B-1
SPECIFICATIONS
A.C. Power Input
Physical Dimensions
5 pounds
Weight
Signal Information
Range
5
Low Range (Open test po nts) ....
Low Range (Shorted test po nts)
H gh
Med
Low
.8% nch
,.3 1 /2 nch
11 1 Z? nch
17 Watts
20 Watts
W dth..
Heght.
Length
Current
R.M.S.
M.A.
.25
.25
92
Current
Peak
M.A.
.7
.7
250
Voltage
P-P open
circuit
120
40
18
Power
R.M.S.
M.W.
.18
.18
65
Power
Peak
M.W.
.5
.5
250
All ratngs, except P-P voltages, are cond t ons ex st ng
across a s ngle s l con d ode n the test term nals of the
Tracker.

<
GENERAL DESCRIPTION
e
The RANGE SWITCH determ nes the voltage and mpedance level of the test s gnal source.
THEORY OF OPERATION
6
The current flow s processed n such a way as to cause a vertcal deflect on of the scope
trace, wh le the voltage drop across the test component causes a hor zontal deflecton of the
scope trace.
The HUNTRON TRACKER appl es a test s gnal across two term nals of the dev ce be ng
tested. Th s test s gnal causes a current to flow through the dev ce and a voltage drop across
ts termnals.
Included as standard equ pment w th each TRACKER s a set of spec al purpose probes. The
probe leads plug nto the front panel test jacks, are f ve feet long and because of spec al t ps
can be used to contact very small component termnals, as well as small P.C. etchngs
w thout the danger of shortng adjacent termnals and leads.
The TRACKER s used to test components n the “ power off ’ ’ cond t on and can be used to
test components mounted on pr nted c rcu t boards or other “ n-c rcu t ” cond t ons, and w th
components br dged by var ous types of res st ve values.
The HUNTRON TRACKER s a “ Specal Use Type ” of osc lloscope and s gnal process ng n 
strument that, through v sual d splay, determ nes the qual ty of certan types of electronc
components.
Access to the component be ng tested s through a two termnal system of test leads that are
placed across the component under test. The test leads are nserted nto the TRACKER front
panel.
Dev ces that are normally tested by the TRACKER nclude the followng:
Sem-conductor d odes and b -polar transstors; f eld effect transstors; ntegrated c rcu t
ch ps of the b -polar and M.O.S. type, nclud ng both d g tal and analog; certan types of
capac tors and nductors.
Front panel controls nclude HORIZONTAL and VERTICAL adjustment of the scope trace,
TRACE INTENSITY POWER SWITCH and three RANGE SWITCHES. An INDICATING l ght
determ nes when the power s “ on ” . The SCOPE tube has a 2Vz " x 2" face protected by a l ght 
ly smoked glass plate.

THE TEST SIGNAL
]
7
Th s s gnal s an 80 HZ modfed s ne wave that apples alternately, pos t ve and negatve,
voltages across the component be ng tested. In an open c rcu t cond t on the pos t ve half
cycle generates the left s de trace on the scope tube; the r ght s de trace would be the
negat ve half cycle. The 80 HZ test s gnal s or g nated n a self contaned osc llator and
presented at the front panel test termnals through a s gnal transformer. The transformer has
the dual purpose of adjustng the test voltage level for the var ous ranges, as well as selectng
the mpedance level of the var ous ranges.
The test s gnal as presented at the front panel, electrcally appears as though t s be ng
or g nated by a mod f ed current generator. A true current generator has nf n te nternal m 
pedance and therefore ts current output s not effected by the load across the generator. The
TRACKER test s gnal generator mpedance s f n te and s d fferent for all three ranges.
Figure 2 shows an electr cal equvalent of the generator secton and how the voltage across
the term nals affect the hor zontal and vertcal deflect on plates of the scope. Shown s the
symbolc representaton of a current generator, GEN, w th a ser es nternal mpedance, Zgen,
and a current sens ng po nt, I. Across these network elements are two test po nts, A and B.
Z gen
—
■e)
B
■'♦20
\
\
\
-20 \.
The f gure shows that a test component has not been placed across the test po nts and
therefore only the hor zontal voltage vector would appear at the scope. Zero current would be
flowng, as sensed, po nt I and the resultant equ valent voltage at the vertcal scope plate
would be zero.
FIGURE 2

c
o o o
G-
□ □□□
8
! JUNCTION
RANGE
A non-lnear component such as a sem -conductor juncton would allow a large current to
flow dur ng the half cycle when t s forward b ased and very l ttle current to flow durng the
reverse b as half cycle. Also the voltage drop across the juncton durng forward b ased cond 
t on would be small; .e., .7 volt; th s would appear as a near short durng the forward b ased
mode and would cause a vertcal trace to appear durng that porton of the cycle. The reverse
b ased cond t on would cause very l ttle current to flow w th a large voltage drop and would
look l ke a hor zontal trace on the scope.
S nce a pure res stance s always a “ lnear ” electr cal element, the resultng trace w ll always
be a stra ght l ne. “ Non-lnear ” electr cal elements, those that are not reactve (contan n 
ductance or capac tance), never g ve a straght l ne over the entre trace length. React ve
elements present a spec al case and w ll be covered later.
A pure res stance across the test leads would create both current flow and voltage drop to the
test leads and would therefore show up on the scope as a deflected stra ght trace. The HIGH
and MEDIUM ranges would have the trace deflected clockwse around the center of the scope
tube from the hor zontal, open c rcu t, pos t on whle the LOW range deflecton would be
clockwse from the d agonal pos t on. On all ranges the length of the trace s reduced
because voltage caused by the res stor load and the trace s rotated toward a more vert cal
pos t on because of the ncreased current through the load. The amount of trace reducton
and rotat on depends upon the test res stance value and the range chosen for the test.
The test leads “ shorted ” cause maxmum current to flow n the leads and zero voltage across
the leads and would therefore be nd cated by a vertcal trace from top to bottom of the scope.
Th s s true n all ranges.
An “ open c rcu t ” cond t on would have zero current flowng through the test leads and would
show max mum voltage across the test leads. On the HIGH and MEDIUM ranges ths s
represented by a straght hor zontal trace from the max mum left to the max mum r ght of the
scope face. The LOW range “ open c rcu t ” cond t on s a d agonal trace from the upper r ght
to the lower left corner of the scope.
u
SEMICONDUCTOR
n LOW I
Figure 1 shows a sem -conductor juncton beng observed wh le the TRACKER range sw tch s
n the LOW pos t on.
FIGURE I

FIGURE
3
T
<*)
&
L
Z gen
9
Figure 3 shows the deflect on pattern that would result from nsert ng a 33,000 ohm res stor
across the test termnals. The res stor causes the horzontal deflecton voltage to be reduced
and because of a current vector now be ng generated due to the current through the res stor,
there s a vertcal deflect on voltage that s equ valent to the current ntens ty and therefore
vertcal deflecton. The resultant pattern s a clockwse rotated trace and s shorter than the
or g nal. The peak current through the res stor s 300 m croamps. The actual short c rcu t peak
current s 700 m croamps. S nce the open c rcu t current flow would be zero, there w ll be a
total peak current range from zero to 700 m croamps depend ng upon the test component.
The generator mpedance on the med um range s approx mately 28,000 ohms. The generator
mpedance on the h gher range s 60,000 ohms and on the low range s 32 ohms.
4';
B
A
' -20
8
10
--- + ---
33K<
FIGURE 4
MEDIUM RANGE

F j GURE
5
I
-2
TESTING REACTIVE COMPONENTS
*1 o
I
Figure 6 shows the resultant wave shape from testng a react ve component. The capac t ve
reactance of the capactor s approx mately 2000 ohms at 80 HZ. Th s s apprec ably less than
the Generator mpedance of 28,000 ohms and thus causes a relatvely h gh current flow w th a
somewhat low voltage drop. Also, s nce the generator s res st ve and the test component
reactve, there s a current-voltage phase sh ft resultng n a splt trace on the scope face.
In the reverse d rect on the d ode s, for all practcal purposes, out of the c rcu t and all of the
useful current passes through the res stor. Th s causes the fourth quadrant trace.
Figure 5 shows a sem -conductor juncton shunted by ten ohms res stance wth the range
sw tch n the Low pos t on. Dur ng the f rst half of the cycle the juncton s forward b ased and
n parallel w th the ten ohm res stor. The comb ned currents of the two dev ces n parallel s
very h gh and causes a near vertcal deflecton trace on the scope. The dotted vert cal lne
represents a zero voltage (short c rcu t) cond t on and s nce the juncton does not have ap 
precable conducton unt l a forward voltage of approx mately .7 volts s generated the ver 
t cal trace s d splaced n the horzontal d rect on by th s amount. As the current ncreases up
to ts max mum allowable amount of 250 m ll amps the voltage across the junct on ncreases
sl ghtly and causes a sl ghtly ncreas ng hor zontal d splacement along the vertcal trace.
J ig
"OHM
Figure 4 shows the 33,000 ohm res stor be ng shunted by a sem -conductor junct on w th the
anode toward the act ve test termnal, A. Durng the f rst half of the test s gnal the juncton s
forward b ased and appears as a near short c rcu t to the test s gnal and therefore creatng
v rutally zero voltage drop and near max mum current flow. Dur ng the last half cycle the test
s gnal reverses polarty and the test juncton s reverse b ased. The reverse b ased resstance
of the d ode s many tmes greater than that of the 33,000 ohm res stance and therefore most
of the current flows through the resstor creatng a scope pattern s m lar to the trace shown
at the fourth quadrant of f gure 3.
+ 8
1 ----------
i
Z gen
r-
' b
A
LOW R^NGE

FIGURE
6
6
Z gen
r
J
i
"T O MfD
= >8
6%
IGO%
and a test capactor of 1.0 ufd causes
FIGURE 7
Z gen
07 MFD —
I
RANGE
MEDIUM
A .07 ufd capactor would cause a phase sh ft of 45 degrees and ths would cause a scope
trace of a mod f ed c rcle as shown n figure 7. The flat part on the top and bottom are caused
by the flattened peaks of the 80 HZ s gnal source.
A
' b
-1/
The current-voltage phase angle equals TAN |Xc
a phase sh ft of 4 degrees.
7 gen
MLu '.-M rx^NGE

c
4
E
33K
B
I
HTR 1005B-1
CIRCUIT DESCRIPTION
*1 2
Signal Section
Figure 9 s a bas c c rcu t representaton of the S gnal Secton of the Tracker. The c rcu t s
shown w th a test d ode n place.
Refer to HUNTRON PROBING Applcaton notes for the HUNTRON TRACKER for further n 
formaton on the scope d splay patterns and a more detaled theoretcal and ph losoph cal ap 
proach to TRACKER sc ence.
F gure 8 scope d splay also represents the pattern that would result from an nductor of the
r ght s ze be ng placed across the test termnals; the t lt be ng caused by the D.C. res stance
of the transformer w re.
Figure 8 results from shuntng the .07 ufd capac tor w th a 33,000 ohm res stor. The res stor
across the capac tor alters the current-voltage phase angle n such a way that there s a
counter-clockw se t lt to the f gure. Also the phase angle s reduced so that there s a narrow 
ng of the c rcle.
.07 i
Dur ng the half cycle porton when the hor zontal s de of the secondary s negat ve the test
d ode s back b ased so very l ttle current flows through the transformer secondary and
res stor R8. The vert cal end of the secondary s very close to ground potental because of R8
and a very small voltage appears on the vert al lead. S nce the mpedance across the
hor zontal s de of the secondary s very h gh relat ve to that appear ng on the vertcal s de
most of the secondary voltage w ll appear on the horzontal s de.
Z Q«n
F GuRE 8
MED UM RANGE

FIGURE 9
T 1
> VERT
R 8
PR I
S E C
>HORIZ
*340
FIGURE 10
R 19
CRT-
T1
<X
Q 1
ic 1
R 22
R 18
R28
rfl
(2)
C30
E
R 20
IC 2
R 11
-2.5
n a
F gure 10 s a more detaled c rcu t descr pt on w th the range sw tch n the HIGH pos t on. R3
prov des for a phase angle correcton when the test po nts are shorted and compensate for
C.R.T. d storton.
8 o
H z
o s c
80
HZ
osc
TEST
DIODE
R 3
4 —
5 K
VERT
PHASE
TEST
DIODE
VERT
GAIN
HORIZ
Q 2 AMP
R 21
180 K
VERT AMP
R 25
2.2 K
HORIZ
POSN
Dur ng the next half cycle the hor zontal s de w ll go pos t ve and the test d ode w ll clamp at
approxmately .7 volt. Also current w ll flow through R8 creatng a large voltage at the vertcal
s de of the secondary. The voltage that appears across R8 s a d rect representaton of the
current that flows through the test d ode.
R 14
^H^IZ t
PHASE
R 16 <
C2 9
---- II — I
(1)
< R 8
> 9 2K
-2 5
*340
R 24 5
HORIZ 180 K 5
GAIN I
VERT
^ POSN
R 27

€
f
€
The h gh secondary w nd ng has a square wave output of approxmately 700 volts peak to
peak whch s converted to m nus 1350 volts D.C. by a voltage quadrupler consstng of C17,
C18, C19, C20, C21, D6, D7, D8, D9, R42 and a ferrte bead. Th s c rcu t provdes up to 600
m croamps for C.R.T. beam current.
The bas c c rcu t conssts of IC5 as a square wave generator dr v ng chopper trans stor Q3 at
20 KHZ rate. The waveform on the collector of Q3 s an amplfed and nverted vers on of the
n t al dr ve voltage. Th s Q3 collector voltage s used to dr ve the base of Q4 provdng for a
180 degree phase d fference between the two ends of the pr mary w nd ng of T3.
M nus 5 volts D.C. s prov ded for the C.R.T. flament. Th s sl ghtly reduced f lament voltage
ensures a longer tube l fe w thout sacr f c ng trace performance.
Also prov ded s plus 340 volts for the vert cal and horzontal deflecton ampl f ers and the ver 
t cal and hor zontal pos t on controls.
Inverter
Th s sect on prov des m nus 1350 volts for C.R.T. acceleraton, cathode, focus and
ast gmat sm controls.
The 80 HZ osc llator s epoxy encapsulated n a steel can and prov des the necessary s gnal
level output and dr v ng mpedance w thout the need for external adjustments.
S gnal transformer T1 s des gned to close tolerances so as to provde the proper secondary
voltage and mpedance levels. Care n des gn el m nates s gnal saturat on and s gnal d stor 
ton.
Vertcal and horzontal pos t on are controlled by a var able D.C. voltage on the nact ve C.R.T.
plates.
A pos t ve go ng s gnal at vertcal locat on po nt (1) w ll be amplfed, phase corrected and
placed at the top vertcal deflect on plate of the C.R.T. The negat ve s gnals at po nt (1) w ll ap 
pear as ampl f ed and phase corrected negat ve s gnals at the vertcal deflect on plate.
Pos t ve and negat ve s gnals at hor zontal po nt (2) w ll be ampl f ed, phase corrected and
placed on the left s de, lookng from the front, horzontal deflecton plate.
The D.C. collector voltage w ll be at plus 170 volts and w ll rema n very constant because the
m nus 2.5 volts s generated n a h ghly stable voltage regulator, IC6.
R16 s the hor zontal phase correct on and compensates for the mpedance of R1 1 gong nto
the hor zontal ampl f er as well as C.R.T. d stort on.
R19 and R20 are the vertcal and hor zontal ga n adjustments. C29 and C30 reduce h gh fre 
quency no se from the ampl f er outputs w thout caus ng a phase sh ft at the output
ampl f ers. Q1 and Q2 are the vert cal and hor zontal ampl f ers. IC1 and IC2 are d fferental n 
put operat onal ampl f ers wh ch are referenced to ground. Th s g ves a qu escent voltage
level of zero volts at the bases of Q1 and Q2 prov d ng for a constant current through the em t 
ter res stors of approx mately .833 m ll amps and a collector voltage drop of 150 volts.
Referr ng back to F gure 9, t was shown that max mum voltage appears at the horzontal end
of the secondary only when there s nf n te mpedance on that l ne. In a practcal c rcu t th s
cannot ex st due to the mpedance as presented by R11 and IC1. R16 corrects for ths d f 
ference.

The vertcal and hor zontal deflecton plates have been prev ously covered.
D5 s a red L.E.D. that nd cates a front panel power “ ON ” cond t on.
15
Transformer T2 has a secondary open c rcu t voltage of 26 volts R.M.S. w th 120 volts R.M.S.
on the pr mary. D1 and D2 form a full wave rect f er for a pos t ve D.C. voltage of approx 
mately 12 volts. D3 and D4 from a negatve D.C. voltage of 12 volts. C6 and C7 are the plus and
m nus 21 volt f lters. IC3 s a pos t ve 6 volt regulator w th a .1 ufd capac tor on the output for
regulator stab l zaton. C10 prov des a very low mpedance path for no se along the plus 6 volt
bus. IC4 s the m nus 6 volt regulator w th the accompany ng f lters on the output. The
regulators are temperature and current protected and w ll automat cally shut down under
adverse condtons.
Power Supply
C3, C4, C5 and R4 form an nput f lter to el m nate transent and h gh frequency s gnals from
the A.C. powerl ne. R43 s a metal Ox de Var stor that looks l ke a very low mpedance when
the A.C. voltage peaks reach a certan level. Excess ve l ne voltage w ll cause h gh current to
flow n the pr mary c rcu t and protecton fuse F1 w ll open.
The ferr te bead plus C20, R42 and C21 form a low pass f lter that removes trans ent sp kes
from the output.
The secondary voltage of 700 volts s rect f ed by D10, f ltered by a ferrte bead, C11 and C23
and prov des the plus 340 volts needed on the deflect on c rcu ts.
The Cathode Ray Tube Circuit
The cathode voltage can be adjusted from approxmately m nus 1335 volts to m nus 1223
volts. S nce the accelerator s at m nus 1350 volts the total var able b as s from m nus 15 to
m nus 130 volts wh ch nsures an adequate range for cuttng off the tube. R33 s the cathode
voltage control and has a front panel access b lty for C.R.T. trace ntens ty.
R32 s the focus control and has a range of approx mately m nus 1220 to m nus 1000 volts.
R31 s a f xed h gh voltage res stor w th a total drop of approx mately 1000 volts. R30 has a
voltage range of plus 125 to plus 340 volts and adjusts for C.R.T. astgmatsm.
The small secondary w nd ng has an output of approxmately 11 volts peak to peak. Th s s
rect f ed by d ode, f ltered by capactor (part of T3) and provdes a m nus 5 volts to the C.R.T.
f lament.
C32 el m nates trans ent no se from modulat ng the C.R.T. beam. R35 ma nta ns the cathode
and f lament at approxmately the same potental.
C26 and C25 f lter the no se sp kes that appear as a result of the floatng mpedance level of
R35.

c
1.
Adjust front panel vert cal and hor zontal controls to the center of the r range.
2.
Turn front panel ntens ty control fully counterclockw se.
3.
Turn power on.
4.
Put front panel sw th on HIGH range pos t on.
5.
Adjust ntens ty unt l spot appears on screen.
6.
Adjust master vertcal ga n (R19) for vert cal deflect on of approx mately .5 nch.
7.
8.
Adjust master hor zontal phase (R16) to the center of ts range. 9.
Adjust master hor zontal ga n (R20) unt l trace f lls out screen. 10.
Short output termnals. 11.
f
Adjust master vertcal ga n (R19) untl vertcal trace s 1 3/8" long. 12.
Adjust vertcal phase — h range (R3) unt l no vertcal t lt. 13.
14.
Readjust R19.
15. Remove output termnal short.
Adjust master hor zontal phase (R16) untl hor zontal trace has no t lt. 16.
17.
Sw tch to MED range pos t on
18. Short output.
Adjust MED range vertcal phase (R2) untl trace has no vertcal t lt.
19.
Remove short. 20.
Adjust MED hor zontal phase (R7) untl trace has no t lt.
21.
22.
23.
IB
Short output and sw tch back and forth between HIGH and MED range. Both vertcal
traces should be w th n 5% of each other n length and approx mately 1 3/8" n length.
Sw tch back and forth between HIGH and MED range and observe trace. It should have
no hor zontal t lt on e ther range and ends of trace should be very close to tube mask but
not out of v ew. Both traces should be w th n 5% of each other n length.
Adjust all Tr m Pots (R1, R2, R3, R7, R9, R16, R19, R20, R30, R32). To ther fully counter 
clockwse pos t on.
HTR 1005B-1 INTERNAL SET-UP AND ADJUSTMENTS
(REFER TO PAGE 37)
Adjust focus (R32) and ast g (R30) for sharpest trace (check ntens ty for correct
br ghtness).

24.
Install d ode at output term nals you should see trace as d splayed n figure 11.
F gure 11
25.
26. Sw th to LOW range.
Short output and adjust LOW range vertcal phase (R1) for no vertcal t lt. 27.
Open output and adjust LOW range horzontal ga n (R9) so that trace looks l ke figure 12.
28.
29.
Insert d ode at output termnals.
Trace should look l ke figure 13. 30.
31.
1/8"
F nal focus and ast g adjustment can be made w th d ode n test term nals and range
sw tch n HIGH or MED pos t on.
F nal adjustments can be made on hor zontal and vertcal ga n and horzontal and ver 
t cal phase for correct trace. The trace length d fference should be less than 5%. Vert cal
and hor zontal trace should have no t lt. Edge of trace should not go off screen.
Vertical
Center L ne
Hor zontal
Center L ne
Horzontal
Center L ne
• i
< i i
► 4 I
I I
I I
F gure 12
Trace should not have full hor zontal length.

■
TROUBLESHOOTING
18
The followng SYMPTOMATIC analys s w ll help solate defectve c rcu try and locate spec f c
defect ve components.
After a c rcu t correcton has been made, refer to the secton on INTERNAL SET-UP AND AD 
JUSTMENTS for the proper C.R.T. trace presentat on.
If the voltages as outlned above are all correct, then proceed w th a complete check of the re 
ma n ng voltages as shown on F gure 17.
A f nal check can be made w th an osc lloscope to check the waveforms as shown by the
tr angular numbers on the CIRCUIT SCHEMATIC. These numbers refer to spec f c wave-forms
on pages 25, 26, 27, and 28.
Burned components or darkened areas on the pr nted c rcu t boards nd cate that excessve
heat has been generated and ths s usually a pretty good clue that a component n the ef 
fected area s defectve.
Plus 12 volts
M nus 12 volts
Plus 6 volts
M nus 6 volts
Plus 340 volts
M nus 1350 volts
F lament voltage 4.8 volts or better
F gure 13
Low range — d ode n test term nals
Vertcal
Center L ne
Hor zontal
Center L ne
a.
b.
c.
d.
e.
f.
g.
Any one of the above voltages should be w th n the tolerances as shown on F gure 17 draw 
ng. The source of a defect ve voltage should be located and corrected.
If a v sual nspecton on both s des of the pr nted c rcu t board fa ls to nd cate an obv ous
problem then proceed by “ Power On ’ ’ test ng for the follow ng voltages. Refer to Figure 17,
apply power to the un t and adjust the power l ne voltage to proper level as outlned n the
SPECIFICATION sect on.
General Information
A defectve TRACKER should always rece ve a very careful v sual nspect on pr or to any ex 
tens ve symptomat c troubleshoot ng.