M68ICS05C Datasheet, PDF (226/250 Pages) –

SUPPORT INFORMATION
activity on these pins when you enter the POD command. If there is no activity on
these pins, check for the following faults:
a. Bad C8 part at location U4
b. Bad socket at location U4
c. Bad connector at location J2
d. Broken trace on pod
e. Cold solder joint on pod
9. If the problem persists, check LED at DS1: remove the C8 device, then short socket
U5 pin 4 to ground. If the LED does not light, it may be defective or installed
backwards.
10. If during the quick-start, the LED at DS1 still does not flash, consult a field
application engineer from your Motorola distributor or sales office.
11. If during the quick-start, the LED at DS1 continues to flash, check that U5 pin 12
goes low when you push switch S4. If it does not go low, ohm out resistor R18 and
switch S4. Consult Motorola Board Repair if needed.
B.4 TROUBLESHOOTING THE PROGRAMMER
If you should experience difficulties when programming a 705C part with which you can perform
other simulator functions, follow these steps:
1. Test the sockets XU6, XU7, and XU8:
a. Verify that no part is in socket XU6, XU7, or XU8.
b. Verify that the voltage on pin 40 of socket XU6 is 5 volts. If not, the socket
may be bad or there may be a bad pod trace.
2. Calibrate V_PP: If pin 3 has 5 volts, calibrate the V_PP using these steps:
a. Turn switch S2 ON.
b. Measure the signal on pin 2 of socket XU6.
c. Adjust potentiometer VR1 until your meter reads 12.5 ± 0.5 volts.
d. Turn switch S2 to OFF and disconnect VDD power
3. Retest programmer:
a. In the ICS, enter the PROGRAM command and follow the programming
instructions that appear on the screen.
b. Before reinserting the 705C device in socket XU6, XU7, or XU8, make sure
that its erase window is covered.
B-4
M68ICS05COM/D