Tektronix 2213 - Page 70

NOTE
T
h
e
followi n g a dju stme n t is only applicable to
i n st r uments havi n g t he Cur r ent
L imit boar d ( Α 19) .
d . AD JU ST- H ead R oom V oltage
A dju st ( R 952) fo r
+4 .3
V if your instrume n t co n tains t
h
e
Curre n t L imit b oard .
A dju st for 43 V if you r i n strume
n t contains t he
P reregulator boa r d .
e . Disconn ect t he voltmeter leads
.
f . Co n nect
t h
e
d igital voltmete r low lead to c h assis
grou nd (
ΤΡ
501)
an d con n ect t h e volts lead to t he -8 .6
V
supply (
ΤΡ
500) .
g . C HE CK - R eadi ng is -8 .64 V to -8 .56
V . If t he
r eading is wit h in t hese limits, sk i p to p
art i .
h . AD JU ST-T he -8 .6 V Ad j (
R 946) for -8 .6 V .
i . R e-i n stall t h e H ig h - V oltage s
h ield
(see
t he " H ig h -
V oltage S h iel d " r einstallatio
n p r oced ur e i n Sectio n 6) o r t he
pr otective sh ield , dependi
ng
on
you r inst ru me n t .
j . C HE C K - V oltage levels
of t he remain i ng power
su p plies listed in Tab le 5-2
are wit h in t h eir specifie d limits .
Ta b le
5-2
P O WER S
UPPL Y L I M ITS A N D R I PPLE
k . Co nn ect t he test oscilloscope,
usi ng α 1 χ pr obe, to
t h e first test p oi n t in d icated
in Ta b le 5-2 and conn ect t he
probe grou nd lea d to
ΤΡ
501
.
Ι . C HE CK - R ipple am p lit u de of
t he do supp ly is wit h i n
t he typical value give n i n Ta b le 5-2 .
m . Repeat parts
k
and
Ι for eac h test poi n t i n Tab le 5-2
.
REV
N O V 1982
η . Discon n ect t he test setu p .
2 . C h ec k H ig h - V oltage
Su pp ly
A dj ustme n t Pr oce dur
e-2213 Service
α . Set t he P O WER switc
h
to
O FF (butto n out) .
b . Set t h e do voltmeter to α ra
n ge of at least -2500 V
do and con n ect t
h
e
volts lead to c h assis g r o und . R emove
t he crt base-soc
k
et
cover a nd con n ect t h ecommon lead of
t he do voltmeter to
pin 2
on
t he soc k et .
c . Set t he P O
WER switc h to ON (button in) .
d . C HE C K-H ig h V oltage Su p ply do level is -1900 V to
-2100 V .
e . Set t h e P O WER switc h to O FF (butto n out) .
f . Disconnect t
h
e voltmeter leads a
n
d re-i
n stall t h
e
crt
base-sock et cover .
g . Set
t h e P O WER switc h to ON ( b utto n in) .
3 . Adj u st CRT G r id Bias ( R 860)
α . Set t he Α S E C/DI V switc h to Χ - Υ .
b .
R otate t he AU TO I NT EN SITY co n tr ol fully
co u ntercloc kwise .
c . Connect α 50 Ω termination to t h e ΕΧΤ Ζ AXIS I NPU T
connector locate d on t h e rear p a n el .
d . AD JU ST- B ot h t he G r id B ias ad j ustme n t ( R 860) and
t he A U TO F OC U S cont r ol for α visible dot . T hen b ack off
t he G r id B ias pote n tiomete r un til t h e d ot ju st d isa p pea rs .
e . Discon nect t he test set up .
4 . A dju st Astigmatism a
n
d
A u
to
F oc us T r ac k ing
( R 887 a n d R 875)
α . Set
:
C h annel 1 AC-G N D-DC

DC
Α S E C/DI V
20 μ s
ΑTR IGG ER M OD E

A U TO
5-5
P owe r
S upp
ly
Test
P oi n t
R ea d i
ng
( V olts)
Ρ - Ρ R i pp le
(m
V )
-8 .6
V ΤΡ 500 -8 .56 to -8 .64
<10
+5V
W 985 4 .75 to 5 .25 <10
+8
.6 V
W 975 8 .34 to 8 .86 <10
+30 V
W
965
28 .5 to 31 .5 <50
+100 V
W
966
95 to 105 <200