OHAUS FD SERIES Service Manual

Also see for FD Series: Instruction manual User guide Quick start guide

Contents

OHAUS FD SERIES Service Manual Manual pdf 11 page image

2-1CHAPTER 2 DIAGNOSIS2. DIAGNOSISThis section contains information needed to properly evaluate the reported problem and diagnose itscause.2.1 SCALE SETUP AND EXAMINATIONSet up the scale according to the Instruction manual. Allow the scale to stabilize to room temperature.Examine the scale for signs of corrosion or physical damage.2.2 PRELIMINARY CHECKSPower up the scale using the customer’s ac adapter. In the case where the scale will not power up,check the ac adapter. Observe and record the error codes and software revision. Record all menu settingsas received.2.3 TROUBLESHOOTING TABLESTroubleshooting tables 2-1 through 2-7 identify actual types of problems that could be encountered withthe scale.The troubleshooting tables refer to interconnection and wiring diagrams in this section to assist in locatingthe problem.2-1 SCALE WILL NOT TURN ON WITH AC ADAPTER.SYMPTOMScale will not turn on with ACadapter supplied.PROBABLE CAUSEAdapter defective.DC input connector at thebottom of scale is defective.Membrane Switch defective.Main PC Board is defective.REMEDYRefer to Section 3.1 and check the acadapter voltage output. If voltage islow or nonexistent, replace the acadapter. If OK, proceed.Refer to Section 4.1 and open the scale.Reconnect the ac adapter to the scale.Check dc voltage on the Main PC Boardor test points as shown in Figure 3-2.Voltage should read between 9 and 14Volts (power off), and above 9 Volts dc(power on). If voltage is not present,check and replace the Harness. If OK,proceed.Refer to Section 3.2 and test the Mem-brane Switch. Replace if necessary.See Repair Procedure 4.2If the scale fails to turn on with a newMembrane Switch, the Main PC Boardshould be tested in accordance withsection 3.4. The Main PC Board ifdefective should be replaced. See Re-pair Procedures 4.3. After repair, per-form Operational Tests in Section 3.6.