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Service Information
Table 4-5
Troubleshooting summary*
Step
Items/component**
1
W152
2
W155
3
W150
4
W151
5
W149
6
W154
7
W156
8
W157
9
W158
10
U100 through U113
*All measurements referenced to digital common (W153)
**W149 through W158 are jumpers located on the pc-board. See component location drawing (at end of Section 5) for jumper locations.
***See Figure 4-8.
4-14
Comment
Required condition
+6V supply
+6V dc
+5V supply
+5V dc
CLR ADDR line***
High logic pulse at the beginning of each card identification byte
transfer sequence (upon power up).
NEXT ADDR line
Low logic pulse before each byte transfer.
Clk line
1.79MHz clock
ID Data line***
Card identification logic pulse train (on power up).
Power up safeguard
Remains low during power up.
RELAY DATA line
Logic pulse train to load relay configuration registers.
STROBE line
High logic pulse to strobe relay configuration registers.
Relay drivers
+6V for open crosspoints 0V for closed crosspoints. Note that pins 10
through 16, pin 10 on U100 and U107 is not connected.
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Table of Contents
Troubleshooting
