WFM 90 and WFM 91 Service Manual 6–31
Troubleshooting Procedures
This section contains the following information starting on the listed pages:
HList of equipment required to perform the procedures, this page
HBattery-fault analysis, page 6–32
HLow-voltage power supply, page 6–34
HFault symptom table, page 6–35
HTroubleshooting flowcharts, page 6–36
HConnector pin locator diagram, page 6–50
Equipment Required
The following equipment and accessory items are required to perform the
Troubleshooting Procedures. Minimum requirement specifications are followed
by an example of equipment that meet these specifications.
Table 6–3: Equipment required for troubleshooting
Equipment Description Minimum Requirements Equipment Example
Television test signal generator 75% color bar and 100% flat field test signals for
the television standard of the monitor to be
tested
NTSC: Tektronix TSG100;
PAL: Tektronix TSG111
Audio generator Amplitude Range: –10 dBu to 8 dBu;
Frequency: 1 kHz to 50 kHz Tektronix ASG100 Audio Signal Generator
Oscilloscope 100 MHz Tektronix 1465B
Picture monitor Composite video for the television standard of
the monitor to be tested
75 Wcoaxial cable Two cables required, male-to-male BNC
connectors Tektronix part number 012-0159-00 (42-inch)
Circuit board vise
Test resistor Two 30 W, 3 W Tektronix part number 308-0142-00
Test resistor 10 kW, 2 W Tektronix part number 305-0103-00
Jumper wires Three, 8 inch 20 AWG
12 V power supply Tektronix PS282