Tektronix WFM6120 Service Manual

General Maintenance
Next, check if a
ny of the three Red LEDs (DS231, DS321, or DS761) are on.
These indicate failures on the General 5 V, processor c ore 1.3 V, and general
3.3 V supplies respectively. If these are lit the most likely causes are the fuses
near J14, but if those are all OK replace the main board.
Next, check the secondary supplies as shown in Table 4-5. Each supply has a test
point in the front left corner of the Main board. (See Figure 4-1 on page 4-24.) If
any supplies are out o f range, replace the main board.
Table 4-5: Main board secondary supplies
Nominal (+V) Allowed range (+V) Measure at
1.8 1.7 to 1.9 TP29
Fan 5 to 13.5 TP24
+5
4.75 to 5.25 TP27
3.3 3.2 to 3.4 TP31
2.5 2.4 to 2.6 TP33
1.5 1.4 to 1.6 TP35
+5A 4.75 to 5.25 TP36
-5A -4.75 to -5.25 TP39
1.3 Core
1.2 to 1.4 TP30
Check the Audio supplies on the Audio board (if an Audio board is installed).
(See Table 4-6 on page 4-15.). The test points are available, with the board
inst
alled. (See Figure 4-2 on page 4-25.).
Table 4-6: Audio main board secondary supplies
Supply name Range Measured at
+1.5 V 1.425 to 1.575 TP6
+3.3 V 3.1 to 3.6 TP8
-5 V -4.5 to -5.5 TP9
+5V 4.75to5.2 TP10
+1.26 V 1.20 to 1.32 TP11
+1.8 V 1.71 to 1.89 TP95
Check the secondary supplies on the Analog audio board, if installed. This is
the smaller audio card to which the 62 pin DSUB connector is mounted. The
test points are available, with the board installed, along the top front edge of the
board. (See Figure 4-3 on page 4-26.).
WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual 4–15

Tektronix WFM6120 Specifications

General

Brand	Tektronix
Model	WFM6120
Category	Monitor
Language	English