System Troubleshooting and Diagnostics
5.7 Using Loopback Tests to Isolate Failures
Figure 5–10 H3604 Console Module Fuses
F2
F1
F4
F3
J5
W4
W2
J6
J1
J1 = TOY Clock Battery
J5 = H3604 Power
J6 = CPU Interface
W2 = Remote Boot Enable
W4 = FEPROM Write Enable
F1 = ThinWire Ethernet Power, 0.5 A
PN = 12-09159-00
F2 = -12V Power, 0.062 A
PN = 90-09122-00
F3 = DSSI Terminator Power, 2.0 A
PN = 12-10929-06
F4 = Standard Ethernet Power, 1.5 A
PN = 12-10929-08
Battery Backup Unit
MLO-006351
5.7.1 Testing the Console Port
To test the console port at power-up, set the Power-Up Mode switch on the
H3604 console module to the Loop Back Test Mode position (bottom) and
install an H3103 loopback connector into the MMJ of the H3604. The H3103
connects the console port transmit and receive lines. At power-up, the SLU_
EXT_LOOPBACK test then runs a continuous loopback test.
While the test is running, the LED display on the H3604 console module
should alternate between 6 and 3. A value of 6 latched in the display indicates
a test failure. If the test fails, one of the following parts is faulty: the KA681
/KA691/KA692/KA694, the H3604, or the cabling.
To test out to the end of the console terminal cable:
1. Plug the MMJ end of the console terminal cable into the H3604.
2. Disconnect the other end of the cable from the terminal.
3. Place an H8572 adapter into the disconnected end of the cable.
4. Connect the H3103 to the H8572.
5. Cycle power and observe the LED.
5–72 System Troubleshooting and Diagnostics