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TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
RS-232 data also passes through U40 and U41. This serial data is sampled at sixteen times the clock of the baud rate.
This clock is supplied by U5 (baud rate generator). U45 latches the baud rate select data and its output defines the clock
rate.
An I/O loop mode is available for TSTRM2. This mode is used to check the I/O address selection circuit. When the
diagnostic program is running in the I/O loop mode, TSTRM2 executes the following program function continuously.
Table 7-25
338 RS-232C I/O ADDRESSES
Selected I/O Address
Program Function
80
Read content of address 80.
88
1. Write data 10 to address 88.
2.
“
20
“
3.
“
40
“
4.
“
80
“
Repeat in rotation 1 through
92
Write data 55 to SIO Port-B data
register.
93
1. Write data 18 (reset command) to
SIO Port-B register #0.
2. Read SIO Port-B register #0.
Repeat 1 and 2.
17.
SERIAL TEST
Program: TSTSR1 (power on), TSTSR2 (Troubleshooting)
Setup: - Loop back test data of TSTSR2 is supplied from the RS-232 port, so the P6107 serial in- put probe must be
connected to pin #2 of the RS-232 connector. (Refer to Figure 2.)
Function:
Power on - TSTSR1 initializes the SIO Port-A and reads the initial status. If the initial status is good, it loads dummy data
into the SIO and checks for any status change.
Troubleshooting - The TSTSR2 diagnostic program has the following three functions;
1.
checks the SIO Port-A status
2.
checks external trigger circuit
3.
checks data passing through the circuit
Function 1 includes six test programs. These programs read the initial status of the SIO Port-A.
7-124
Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Page 555: ...PIN 058584 ...