Service manual

Correct Use of ON/OFF Switch . . . . . . . . . . . .6-3
7 Service
What To Do If “Nothing” Works . . . . . . . . . . . . . . . . . .7-1
Trouble Shooting—Audio . . . . . . . . . . . . . . . . . . . . . . .7-2
Trouble Shooting—Digits . . . . . . . . . . . . . . . . . . . . . . .7-4
Segment Repair and Maintenance . . . . . . . . . .7-6
Testing Digit Coils . . . . . . . . . . . . . . . . . . . . . .7-6
How to Remove a Digit . . . . . . . . . . . . . . . . . . .7-7
Trouble Shooting—Operator’s Console . . . . . . . . . . . .7-7
Trouble Shooting—Electrical Power . . . . . . . . . . . . . .7-9
Electrical Power—#2860 Control Board . . . .7-10
Electrical Power—#4290 Control Board . . . .7-10
Trouble Shooting—Data Cable . . . . . . . . . . . . . . . . . . .7-10
Trouble Shooting—Speaker . . . . . . . . . . . . . . . . . . . . .7-12
Trouble Shooting—Optional Battery . . . . . . . . . . . . . .7-12
To Charge the Battery . . . . . . . . . . . . . . . . . . .7-13
To Replace the Battery . . . . . . . . . . . . . . . . . . .7-13
Long-Term Battery Storage . . . . . . . . . . . . . . .7-14
How to Remove the Control Board . . . . . . . . . . . . . . . .7-14
8 Scoreboards Two-Year Limited Warranty . . . . . .8-1