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4. MAINTENANCE & TROUBLESHOOTING
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment
unless totally familiar with
electrical circuits and
service manual.
Only qualified personnel
should work inside the
equipment.
4.1 Maintenance
4.1.1 Cleaning
Dust or dirt on the equipment may be removed with a soft, dry cloth. Do not use commer-
cial or chemical cleaners to clean the unit; they can remove paint and markings.
4.1.2 Resetting the circuit breaker
The BREAKER button on the rear panel pops out when the voltage input to the equipment
exceeds the voltage rating. In this case, reset the power and press the button to restore
normal operation.
4.2 Self Test at Terminal Unit
1. At the standby display, press [F4], [6], [5] and [Enter] to display program nos. of de-
vices. If the IB-681 is powered off or is not connected, *CONNECT ERROR* appears
in the HSD MODEM field.
[Self test]
<<Program No.>>
CPU1 (Tx) 165-0104-1** (Rx) 165-0103-1**
CPU2 (SYS CPU) 165-0105-1** (I/O) 165-0108-1**
ANTENNA 165-0102-1**
VOICE CODEC 165-0096-x**
HSD MODEM (CPU) 165-0133-1** (DEMOD) 165-0134-1**
(DECODE) 165-0135-1**
Start Selftest OK? (Y/N) Y
** Program No.
Figure 11 Program no. display
2. Press [Y] and [Enter] to test.