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M68ICS08ABUM/D
APPENDIX A – TECHNICAL REFERENCE & TROUBLESHOOTING
d. Check the MCU PWR at test point TP3 (MCU-VDD). Using the side
pin on P1 (DC INPUT jack) as the ground reference, check for
5.0Vdc at TP3.
e. Check the ICS08AB board's V
nected. With the ICS08AB board powered, and no host connection
to the ICS08AB, install jumper on W9 to activate on-board regula-
tor, check for the following voltages on the ICS08AB board, using
the side pin on P1 (DC INPUT jack) as the ground reference:
Approximately 8.0 Vdc at TP1 (VTST_IRQ)
Approximately 8.0 Vdc at TP2 (VTST_RST)
If this voltage is not present when the MCU PWR LED is lit, there
may be a problem with the ICS08AB's internal step-up power sup-
ply. Remove jumper on W9 to activate on-board regulator by DTR.
f. Check the ICS08AB board's V
First, exit any ICS08ABZ software that may be running on the host
PC. Then disconnect power from the ICS08AB. Ensure that the
ICS08AB board is configured for the factory default settings.
Ensure that there is an MCU in XU1 and that it is inserted correctly.
Connect the serial cable between the host PC and the ICS08AB.
Apply power to the ICS08AB. At this point, the ICS PWR LED
(Green) should be lit, and the MCU PWR LED (Yellow) should be
off. If the MCU PWR LED is on, there may be a problem with the
host PC's serial port or the serial cable. See step 5 for communica-
tions problems. If the MCU PWR LED is off, start the ICS08ABZ
simulator software as described in Section 1.6 HARDWARE
QUICK START INSTRUCTIONS while watching the MCU PWR
LED.
If the MCU PWR LED does not light at all, there may be a problem
with the host PC communicating with the board. Refer to step 5.
If the MCU PWR LED flickers a few times and then goes out, the
host PC is able to control the power to the ICS08AB board but
communications may still not be established with the MCU. As the
flickering of the MCU PWR LED indicates, the host PC is applying
and removing power to the ICS08AB board during this period. Use
an oscilloscope to view the voltages on TP1, TP2 and TP3 as the
software tries to establish communication with the MCU. Restart or
retry the ICS08ABZ software while looking at the signals. Using
the side pin on P1 (DC INPUT jack) as the ground reference, check
for a signal that varies between 0 and +5 Vdc at TP3 (MCU-VDD)
and between 0 and +8.0 Vdc at TP1 (VTST_IRQ) and TP2
power with the host discon-
TST
power with the host connected.
TST
A-5
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