VOLTAGE AND RESISTANCE MEASUREMENTS
Table 5-4 provides a voltage and resistance chart to aid in troubleshooting
the Express Orderwire Multidirection Unit.
1. All voltage readings are made with the POWER switch on and
with all printed wiring boards, except the amplifier board on
which measurement is being made, in their connectors. The
amplifier board on which voltage is being measured should be
placed in the board extender, and the board extender inserted
in the proper amplifier board connector. Voltage measure-
ments are then made at terminals provided on the board ex-
2. Resistance measurements are made at connector points on the
printed wiring boards with the boards removed from the unit.