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6. USER MAINTENANCE/SERVICE
6.1 Fuse Replacement
If the fuse is suspected of being defective, it should be inspected and, if necessary, replaced. To
inspect or replace the fuse, please perform the following steps:
(1) Disconnect the AC line cord from the unit to reduce electrical shock hazard.
(2) Remove the fuse by sliding out the fuse holder. The fuseholder is beneath the AC Receptacle.
Test the fuse for electrical continuity with an ohmmeter.
(3) If the fuse is found to be defective, replace it with a replacement fuse as specified in the label
on the rear panel.
(4) Replace the fuse in the fuseholder and re-install.
(5) Reconnect the AC power cord.
NOTE: USE OF ANY FUSE OTHER THAN THE ONE SPECIFIED MAY CAUSE DAMAGE TO THE
UNIT, POSE A SEVERE FIRE HAZARD, AND WILL VOID THE WARRANTY.
6.2 In Case of Difficulties
This programmable power supply has been designed to be accurate, reliable, and easy-to-use. If you
experience any difficulties during the use of the unit, please perform the following steps.
(1) Re-read the operation instructions, It is very easy to inadvertently make mistakes in operation
procedures.
(2) Remove and test the fuse. The power supply will not function with an open fuse.
If the preceding two steps fail to resolve the problem.
NOTE: ATTEMPTED REPAIR, MODIFICATIONS, OR TAMPERING BY UNAUTHORIZED
PERSONNEL WILL VOID THE WARRANTY.
6.3 If the ERROR#2 shows on LCD
If the ERROR#2 shows on LCD, the calibration data in the EEPROM has been erased. The power
supply needs to be recalibrated. Please process the EEPROM reset procedure below and follow the
calibration procedures in the manual and enter the correct calibration value, the ERROR#2 will
disappear as well as the beep sound.
EEPROM Reset Procedure for LPS 305:
Press the -Iset(5) key and the +▼ key simultaneously.
6.4 Using the RS-232-C Serial Interface
This section describes hoe to set up the RS-232-C interface for remote control.
The interface of TPT-3025 are designed in accordance with EIA (Electronic Industries Association)
standard RS-232-C. Through its interface be TPT-3025 be remotely controlled and transmit its internal
data to a hose computer.
(46 pages)
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