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VOLTAGE AND RESISTANCE CHART
"'"
"H'
DC VOlTS
DCVOUS
ACVOLTS
(1
kc)
"''''.-:I
NO SIGNAL
l.4WAm
1.DVOLTS INPUT
UNIT
OFf
-,-
I
".
'112
,.
...,
V,
2
•
•
I."
510KD
,
...
...
1.13
' . OKlI
.U
fJI-m
(6.
aVN:
til
pin 9)
,
232
".
•.s
,_
7
112
105
"
...,
8
105
1112
•••
""'''
•
f11_nt
....
1
•
•
•••
......
...va
2
•
0
•••
-..
,
,~.
"
.,
'"''
.U
f l l - ' (6.3VAC b.twee)
•
7
'"
" .
,
I......"
8
•
•
'.S
......
•
,.,
'"
' "
•
..
118'
,
'"
.."
V'
2
a
,.,
'"
,-
.U
f11_t (6.3VAC be'--)
•
7
'"
..
"
8
•
All
~
CIIIcl_btane:_ _ ........
ntd to
d-II. Vo","- _ - - '
.... CI
hIth
InpIt 1....0- vrvM. All ...1,__
F
. . .
_
. . . . .
w,1ta
pill 3 of !hi EZ81 graunOM -.pt,
of - ,
wMn tM
~
to
_ _ .. pint
2 . . 8
of the
EZ81 II bel",
checW,
0,-.....
11.. vol,.
....... ".1. . .
" "
Is
117yoltlN::,'CI. . HOl'EIALL
YQl.TAOI!
&
RESISTANCE VAWI!S MAY VAW NOIMALLY
rv
.1,..
SYMPTOM
House power line fuse blows;
fuse,
F1,
remains IntQct.
Fuse, Fl, blows.
Any
or all
tube
ftlc:zments
not lit.
DC voltage at V4 cathode (pin 3)
is incorrect os specified below.
a) No voltage
b) High voltage
c)
Low
'10
Itage
TROUBLE.SHOOTING CHART
CAUSE
Short in line cord, J2, J3 or associated
equipment plugged Into J2 or J3.
If the amplifier causes a replacement fuse to
blow with rectifier tube
VJ,
removed, primary
or high voltage secondary windings of 12 are
Incorrectly wired or shorted.
If Fl
does
not blow after replacement (with
V4 removed), check for short in 11+ circuih,
defective V4 and
ca.
Open lead from 6.3 V winding of 12.
6. 3 V winding of 12 open
Defectiye VA
C8 shorted internally or externally.
Connection to C8 broken.
Connection
to
center tap of h.
v,
sec. winding
of T2 open.
Output tubes V2 and V3 over-biased
or not drawing current.
Excessive current drain in amplifier.
Defective V4.
REMEDY
Ropcolr
Check
and
repair or replace.
Repair
Rapl... T2.
Replace
Replace or repair.
Repair
Repair
See trouble-shootlng typieal
stage.
See trouble-shooting typical
stoge.
Replace
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