Tektronix CSA7404B Service Manual

Troubleshooting
6-70
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
Measure the power supply voltages with the voltmeter and compare each reading
to the values listed in the tables. If the voltages are within about 5% of the
nominal voltages, your power supply is functional.
Table 6- 5: Power supply voltages
Front power distribution board
(P2) and Power supply (J2)
Voltage
Rear power distribution board
(P1) and Power supply (J1)
Voltage
PinsA/B/C1,3,5,7,9,11 +3.3 V Pins A/B/C5, 6 +12 V
Pins A/B/C13 -- 1 5 V Pins A/B/C8, 9, 11, 12, 14, 15, 17 +5 V
Pins A/B/C15 +15 V Pins A/B/C19, 21, 23, 25, 27, 29, 31 +3.3 V
Pins A/B/C17, 18, 20, 21, 22 -- 5 V Pi ns B/C3 (fan voltage) +9.8 V
Pins A/B/C24, 25, 27, 28, 30, 31 +5 V
Rear power
distribution
circuit board
Front power
distribution
circuit board
PA bus
circuit board
J2 and P2
J1 and P1
Figure 6- 45: Connectors J1 and J2
If there is a display on the VGA port, but not on the LCD, replace the display
assembly (LCD, lamps, and cable).
If the Instrument Will Not
Boot

Tektronix CSA7404B Specifications

General

Brand	Tektronix
Model	CSA7404B
Category	Measuring Instruments
Language	English