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Service Manual
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2. Check TP487 for +3V (supplied by D471).
7.5.12 RAM Test
You can use the Microsoft TERMINAL program to test the RAM. Proceed as follows:
1. Connect the Test Tool to a PC via the Optical Interface Cable PM9080.
2. Start the Terminal program, and select the following Settings:
Terminal Emulation TTY (Generic)
Terminal Preferences Terminal Modes CR -> CR/LF
Line Wrap Inbound
Local Echo Outbound
Sound
Communications Baud Rate 9600
Data Bits 8
Stop Bits 1
Parity None
Flow Control Xon/Xoff
Connector COMn
3. Turn the test tool off. Keep the keys
pressed, and turn the test tool on again.
This will start up the mask software. You will hear a very weak beep now.
4. In the terminal program type capital characters
X (no ENTER!). After a number of
characters the test tool mask software will respond with an acknowledge 0 (zero).
This indicates that the communication between the Terminal program and the test
tool is accomplished.
5. Type ID
and press [Enter]
The test tool will return an acknowledge 0 (zero), and the string
Universal Host Mask software; UHM V2.1
If it does not, check the Terminal program settings, the interface connection, and the
test tool Optical Port (Section 7.5.5).
6. Type EX10,#H400000,#H20000
and press [Enter]
The test tool will return one of the following acknowledges:
0 the RAM is OK.
1 syntax error in the typed command
6 the RAM does not properly function.
Notice that the acknowledge overwites the first character of the message sent to the
test tool.
7.5.13 Power ON/OFF
1. Check TP528 for +3V at power on, and 0V at power off (supplied by D471).
If not correct, do the Section 7.4.1. tests first!
2. Check MS444 (ONKEY, D471) for +3V; when pressing the ON key the signal must
below for 100...150 ms.
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