Philips PM2517E - Attenuator; Display Cannot be Adjusted to Zero

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6.4. V: ATTENUATOR
6.4.1.
Display
cannot be adjusted
lo zero
No.
From
Measurement
l\4easuring
points
Measuring data Correct
tncorrecl
Check
I
lhe
p.c
board Open
npu
i
Check
Cl08 Open
nput
C108
=
5p5
lr
mrner Reler lo C
Replace
C108
c
Dispiay Display
Open
nput
Range
999
9mV:
lnsuiate se ectors witch
pa(
V: 1/2 wrth a
prece
of rnsulalrng
malerial.
shilted undef
lhe
slrd
ng
conlacl
(Refer
ro Fig.
)
Display i 000.0mV Deiect V201
rei€r to O
D c
Djspiay Disp ay
Cut
lrack from R204
ro A102i 1
(000064)
The track
is
situaled al
the
conductorside
Fange 999 9mV:::
Open
Inpu t
DLsp ay :000.0mV Oelect O00064
0elecl
V102.
rep
ace
V10l
6.4.2. Range 1V
:-==
cannot be adjusted
(adj.
no.
3, 4, 5.)
No. From Measurement Me 3su
ring
points
l/easu ring data Correct
tncorrecl
Disp ay Fefer to Adt
no
3.4.5 Check;
R204
=
47k
pot
meler
Trackinterruptrons
C201
=10nF
I
shorl
C202
=
33nF
t
clrcu I
R201
=
4M2
|
lnle'.
R202=4M2
f
ruption
a Instrument
slays
on
tl
Drsplay
reler to Adt. no.3,4.5 Ch€cki
R2O1
-
4M2
R2A2
=
4M2
F108=1M
R109=lM
6.4.3. Range
lov
-_--
and l00V
===
cannol be adjusted
(adj.
no.
6,
7)
No. From
l\4easurement l'/easuring
points
Measuring data Correct
tnco
rrecl
Rang€ deviatos
with a laclor ol 100
R205. R206, R207
and
R208
R205
=
9k09
R206
=
1M
R207
=
100apol. meter
R208
=
820k
Refer to B
Check: R205, R206
R207
and
R208
a
Checki
Track nterruptions
Se ector switch
(cl€anl)
Refer to C
Repa r
c B
R on v201
Range 10V
-:
Hi
=
V201 drain
Lo
=
V201 source
9-meter
<60Q Track interruPtron
Eeler lo
D
D
c
Gale voilage V201
Range
10V:
Hi
= gate
V201 OV Defecl
V201
Reler to
E
E
o s the decimal
pornl
in Check rangrng
counler
OO0059