Instruction manual

Chapter 2 Service
Troubleshooting the Counter
Assembly-Level Service Guide 2-47
2
Table 2-4 lists A4 power supply voltages, the corresponding wire color, and the
tolerances.
5 After verifying the correct voltage and that all calibrations passed, proceed to
the following section.
Overview of the Self-Test Routines
The Utility menu includes the following three self-test menu items:
• TEST LOOP:
• TST PRINT:
•TEST:
The Counter includes several self-tests. Some self tests are performed at the power-up
of the Counter. Some of these self tests can also be invoked from the Utility menu.
Other tests can also be invoked from the Utility menu, but a slightly different test is
performed. For example, a power-up self test might work regardless of connections to
the inputs while a Utility menu self test may require a specific signal to be connected.
Some self tests can only be invoked from the Utility menu, for example, the keypad
test.
You can specify that the tests should loop forever (TEST LOOP: ON or OFF) or
until any key is pressed.
Table 2-4. A4 AC Power Supply Voltages
Wire Color Voltage Tolerance
Red +5.0 V ±0.250 V
Red +5.0 V ±0.250 V
Black 0.0 V ______
Black 0.0 V ______
Yellow +12.0 V ±0.6 V
Black 0.0 V ______
Blue -12.0 V ±1.2 V