Controller Electronics And Power Supply Assembly - HP 9122D Service Manual

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Controller Electronics and Power Supply Assembly
Figure 4-1 represents the powet supply and controller electronics (SIN Prefix 251 8A and below) of the
printed circuit assembly (peA). Figure 4- 2 represents the supply and controller electronics (SIN Prefix
2614-A, 2615A and above) of the peA.
The following information applies to both controller peAs shown in Figure 4-1 and 4- 2. Jumper J6 is used
to configure the controller peA for either a single disc drive or for two disc drives (9122S or 9122D respec-
tively). J7 is used to start the service tests. Jumper J6 is shown in the 91220 position, and J7 is shown in
the normal operating position.
4-2
SW1
TP1
o TP 2
o
L, __
-,D
J5
pu.)~
R11
CJ CJ
JJ J4
09122-69501
TPt +5VOC
TP2 +12VOC
TPJ -IZVOC
TP4 GNO
TP5 INDEX
TP6 TRKO
TP7 READ DATA
TP8 WRITE DATA
TP9 eNO
TPl0 +5VOC
TP 1 1 Re;..o eLK
'------.., 0
TP J ()
LED 1
-~
SELFrEST LED
HP-18
SELECT CODE
1
f
L
o ••••
--'tt -
ip--r
" .. ,-. ........r---_ _ _
-J
TP9
o
o TP 10
TP7
TP
50 0
o
TP8
0
TP6
Jt
J 1 TO FlEXIBLE OISC ORI\IES
J2 HP-IB
JJ,J4
~R
TO OISC ORIVES
J5 TO F"AN
J6 SINGLE OR DOUBLE
J7 SEFMCE TEST
Fuse F2 is fo" +5V and -11Y supplies
Fuse F3 is for the
+
12V
siupply
and the Fan
Fi~~ure
4-1. Controller and Power Supply PCA(09122-6951l)