Tektronix 7704A User Manual

7 . Connect t h e multi-pi n con n ectors to t h e board .
Matc h t
h
e arrows on t
h
e co
n
nectors to t
h
e arrows on t h e
board .
8 .
Re
p lace t
h
e power u nit
in
t
h
e instrument .
G . A31-RECTIFIER A ND FI L T ER B OA R D .
To
remove t he Rectifier and F ilter board, use t he
following procedure . An ex p loded-view drawi ng of t
he
power unit is s h ow n in t h e Mec h anical
Parts L ist . Also,
several
critical parts are i
d
en tified in Fig . 3-8, anex ploded-
view drawing of α portion of the power unit .
1 . Slide t h e power unit out of t he i n strume n t as
descri b ed previously .
2 . Remove t he protective cove r from t
he power unit as
desc r i b ed u nder Access to Com p onents
in Power Un it .
3 .
Disconnect t
h e multi- p i n connectors from Α 32,
Regulator boar d , a nd
Α
31,
Rectifier
and
Filter board .
4 . R emove t he two plastic screws w
h ic h secure t h e
circuit- b oard s h ield in place on Α 30,
Powe r Supply Inve r ter
board .
5 .
Un
solder t
h e four power-transformer lea d s from Α 30,
Power S upp ly Inve r ter boar d . T h ese leads, w h ic h pass
t h roug h h oles in t he boar d , are identified on t h e circuit-
board illustratio n in t he Diagrams sectio n . Remove t h e
excess solder from t h e boar d with α vacuum-type de-
soldering tool .
6 . R emove
t
he
fo
u r screws secu ring Α 31, R ectifier and
F ilter board to t he power unit .
7 .
R
emove t h e circuit board
along with t h e power
transformer .
8 . To re p lace
Α
31,
Rectifier
a
nd Filter board, reverse
t
h
e
r
emoval
proce dure .
Η . A30-POWER S UPPL Y I NVER T ER B OA RD .
To remove t h e Power
S
u p p
ly Inverter board, use t h e
following proce du r e . An
ex p
lo
d ed-view drawi ng of t h e
power u
n
it is s
h
ow
n in
t
h e Mec h anical Parts L ist . Several
critical parts are i d entified in Fig . 3-8, an explo d ed-view
drawing of α portion of t h e power unit .
Ο
i
W A RN I N G
Maintenance-7704A Service
F ig .
3-8
. E xp lo d e d -view dr awi n g of α portio n of t he p owe r un it
i den tifyi n g seve ral c r itical parts .
T h e powe r - un it assembly h as bee n teste d at t he
factor y to assure safe ope ration . Impro p er re p air of
t h is un it can result i n h aza r dou s voltages on the
ch assis of t h is inst ru me n t . Do n ot
r emove t hep late
i n sulator , bloc
k
insulato
r ,
o
r tra n sisto r s h ield f r om
t h e
rear
heat sin k (see F ig . 3-8) .
1 .
R
emove
Α
31,
R ectifier
a
nd F ilte r board usi n g t he
previous proced
u
re .
2 . Remove t h e screws w
h
ic
h
attac
h Α
30,
Power Su pply
I n verter board, to t
h
e rest of t
h
e power
unit .
3 . Unsolder t
he li n e-i npu t leads from the ci r cu it board .
T h ese lea d s
a
r e identified on t h e ci r cuit-board illust r ation in
t
he Diagrams sectio n . Remove t h e excess solder from t h e
board with α vacuum-ty p e desoldering tool
.
4 .
Remove
t
h
e two
metal-cased p owe r t r ansistors by
removing
t
he securi ng nu ts
an
d pu lling t he tra n sistors fr om
t
h eir soc k ets .
3- 1 5

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English