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A.
24: TROUBLE SH0OTING HINTS
There are four basic steps to trouble_:lrpS{rrg
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a. Analyze the symptom
b. Localize the trouble to a functional system
or module
c. Replace or repair t}lat system or module
a. lsolate the trouble within the module
b. Locate and repair the specific trouble
Checking Semiconductors Wirh A VOfi4:
a- Set the ohms scale to R x 10
b. The forward resistance should be low
c- The reyerse resistance shoutd be high
TRAFISISTOR ilPN TYPE (2$C.2SD,
FIs. #I9
Fb. #eo
Typical Amplificr Test Set-Up
EIIIS ITSFUT
DIOD€S
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B .
C.
D.
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NOTE: Farutard and reversr resistance LOW &
HIGH is only a suggested quick and easy check
of components out of circuit. This test is only
firr shcrted and open junction t€st. A VOM will
not test the quality of a :erni-conductor accu-
rately.
lC's are best checked by checking the signat
input and output conditisn. This can be done
by inserting a low level audio tone inta the
MIC jack and the signal path from the input
of 1C-1 through lC-2 and to lC-3.
Amplifier test cables can be easily made from
locally available parts. A nine pin miniature
tube socket and mate plug can be wfred as an
extensicn power cable, allowing the amplifier
to be operated away from the projector. The
solar cell and exciter lamp connestion can also
be extended if so desired.
re. #ze
o8clLL0SC0PE
SPEAK€R
- 2 4 -
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