Power Supplies Resistance Checks; Dc Voltages Check - HP 5334B Service Manual

8-301. Signal level troubleshooting for each functional part of the HP 5334B is described i n the following
paragraphs.
8-302. POWER SUPPLY TROUBLESHOOTlNG
8-303. Use basic methods to troubleshoot the power supply. Make voltage and resistance checks with a Digital
Multimeter (DMM) and oscilloscope. Measure
all
regulator and rectifier dc outputs for the correct voltages and
check for shorts to ground. Figure &24 shows the Power Supply circuits.
8-304. The HP 5334B contains four dc supplies, shown in Tables 8-8 and 8-9.
Table 8-8. Power Supplies Resistance Checks
Table 8 9 . DC Voltages Check
RESISTANCE TO GROUND AT REGULATOR OUTPUTS* (POWER OFF)
HP 5334B
-
Service Manual
8-41
RESISTANCE
350 Ohms
228 Ohms
85 Ohms
589 Ohms
229 Ohms
489 Ohms
VOLTAGE
-5.2V
+5.OV
DIG.
+
3.0V
+
5.OV LIN.
+
12.0V
+S.OV MATE
*
Note that the resistance values listed above are nominal values only and may differ slightly from instrument to instrument.
These values should be used
only
as a possible indication of
a
problem.
TEST POINT
AlTP3
A1 TP4
A1TP5
AlTP6
AlTP7
AlTPX
i
RESISTANCE
NONE
NONE
A1 R202
NONE
NONE
NONE
VOLTAGE
-5.20V
2
0.26V
+
5.00V DIG.
2
0.20V
+
3.00V
2
0.02V
+
5.00V LIN.
+
0.20V
+
12.00V a 1.00V
+
5.00V MATE
2
0.20V
TEST POINT
AlTP3
AlTP4
AlTP5
AlTP6
AlTP7
AlTPX