Digital Assembly Problems; Analog Assembly Problems - Ectron 1140A Instruction Manual

Fault: Turning or pressing the ENCODER has no effect
Solution: Make sure that the cable to the ENCODER is connected. If it still does
not function, replace the ENCODER.
Refer to the procedure for
Fault: Pressing one or more front-panel keys has no effect
Solution: In the DIAGNOSTICS MENU, select KEYPAD TEST. Watch the display
while pressing front-panel keys to determine if the key presses are detected. If
only one or two keys do not function, remove the rubberized KEYPAD, and clean
any contamination from the nonworking key. Additionally, clean the surface of the
keypad assembly that has the gold-plated patterns for the keys. If the KEYPAD still
does not work, replace the keypad assembly.
Refer to the procedure for
Fault: Pixels are missing from the display
Solution: Replace the display. Refer to the procedure for
Removal.

Digital Assembly Problems

Fault: At power-on, a diagnostic message such as NVRAM CHECKSUM ERROR is
displayed
Solution: Replace the digital assembly. Refer to the procedure for
Assembly
Fault: Internal clock not running
(This will be apparent when setting the time and when logging data.)
Solution: Replace the battery BT1 on the digital assembly. Refer to Figure 9-2.

Analog Assembly Problems

Fault: At power-on, a diagnostic message such as A/D ERRORS is displayed
Solution: Ensure that the ribbon cable from the power supply to the analog
assembly is plugged in. If it is, replace the digital assembly.
Refer to the procedure for
Fault: Unit operates in neither meter nor source mode
Solution: Check the dc voltage at the charging supply terminals as described
above. If no problem is found, the power supply or the analog assembly may
require repair. Contact Ectron for further instructions.
Encoder
Keypad
Removal.
Digital Assembly
Removal.
Removal.
Removal.
8-3
Troubleshooting
Front-panel Display
Digital