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SECTION 4
service
lnfornlation
Cd 1 Gd
0
,;
24
0
Col2Gd
0
Col3Gd
"&
',;
N/C
Cd 1 HI
Co1 2
HI
Cal 3
HI
Cal 4
HI
Co15 HI
Cal 6 HI
Cal 7
HI
Co16 HI
Cal 9 HI
Col 10 HI
Co111 HI
Col 12 HI
A) COLUMNS Receptacle
(1 of 2)
Columnr
(A-D)
ROWS
Columns
(E W
-
Ii
il
I
II -
View of receptacles
looking at Rear Panel
HI = High
Gd = Guard
N/C = No connection
Fimre 4-10.
D-sub Receatacle Contact Assimments
Row AGd
240
y,
RowEHI
23
0
0
RowCGd
22
6
0
g
RowCGd
2'o
:
RowDHI
*'o
y
RowEGd
"0
;
RowfGd
180
2
Row F HI
Row G Gd
Row G Gd
Row H HI
N/C
Row A HI
Row B Gd
Row B Gd
Row C HI
Row D Gd
Row D Gd
Row E HI
Row F Gd
Row F Gd
Row G HI
Row H Gd
Row H Gd
B) ROWS Receptacle
;tep
-
1
2
3
4
5
6
7
8
9
10
Table 4-5.
Troubleshooting
Summary*
Items/Component**
Comment
Required Condition
W152
+6V supply
+6V dc
w155
w150
+5v supply
+5V dc
CLR ADDR line***
High logic pulse at beginning
of each card identification
w151
byte transfer sequence (upon power up).
NEXT ADDR line I**
w149
Low logic pulse before each byte transfer.
Clk line
1.79MHz clock
w154
ID Data line***
W156
w157
Power up safeguard
Card identification
logic pulse train (on power up).
Remains low during power up.
RELAY DATA line
W158
Logic pulse train to load relay configuration
registers.
STROBE line
UlOO through U113
High logic pulse to strobe relay configuration
registers.
pins 10 through 16
Relay drivers
+6V for open crosspoints = OV for closed crosspoints. Note
that pin 10 on UlOO and U107 is not connected.
'All measurements referenced to digital c~n,m~n (w153)
'*W149 through WI58 are jumpers lacated on the pc-bard. See Component Location drawing (at end of Section 5) for jumper locations
'*'See Figure 48.
4-14
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