Diagnostic Mode
5-13
Look up the DSD, DZ, ULM(LU), DLM(LD) and DLK signals in the computer memory (see
“Troubleshooting Using the Computer's Internal Memory ” on page 5-9). When the car is at the
bottom floor with the doors locked, the correct values for these signals in the computer memory
are as follows:
DSD= 0 (OFF)
DZ= 1 (ON)
ULM(LU) = 0 (OFF)
DLM(LD) = 0 (OFF)
DLK = 1 (ON)
If there is a different value for any of the 3 signals, check the wiring associated with that partic-
ular signal.
For example, if the DSD signal is equal to 1 (ON) in the computer memory, inspect the DSD
input wiring, including the Down Slow Down limit switch. The Down Slow Down switch con-
tacts should be open when the car is at the bottom.
What to do for Scenario B: In this situation, the USD input is usually the problem.
Look at the USD signal in the computer memory (Address 2E, Position 2). USD should be ON
except when the car is at the top; then it should be OFF. If the signal is not following this rule,
then inspect the wiring associated with the USD input, including the Up Slow Down limit
switch. The Up Slow Down switch contacts should be open when the car is at the top.
What to do for Scenario C: In this situation, the DSD input is usually the problem.
Look at the DSD signal in the computer memory (Address 2E, Position 6). DSD should be ON
except when the car is at the bottom; then it should be OFF. If the signal is not following this
rule, then inspect the wiring associated with the DSD input, including the Down Slow Down
limit switch. The Down Slow Down switch contacts should be open when the car is at the bot-
tom.
Setting Parameters (Options) to Default Values
There are occasions when it is necessary to set the parameters (options) to their default values.
Setting the parameters to their default values is usually required when:
• The MC-MPU software is changed.
• RAM memory becomes corrupted. This sometimes happens due to lightening.
To set the MC-MPU parameters to their default values:
1. Place the car on Machine Room Inspection.
2. Place function switches F1, F3, F5 and F7 in the On (up) position.
3. Press all four push buttons (N, S, +, -) at the same time.
4. Using the settings shown in Appendix A, Original Programmed Values and the Record
of Changes, reprogram the values that are different from the default values.
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