76
Keysight U3042AM20 User’s and Service Guide
U3042AM20
Troubleshooting the Test Set
-
Figure 52
Test Set Diagram
5. Front Panel R and S indicator LED Check.
a. Verify the test set Controller board Controller Status LEDs, shown in
b. If none are on remove the Switch Driver board and recheck, if still no
indication, replace the Controller board.
c. If the Controller Status LEDs are on and the front panel Active LED is
on, suspect the front panel LED boards or the ribbon cables. Replace
as needed.
6. Control Lines are not working.
a. Verify that the control voltage pin connections to the DUT control
lines are connected properly. Refer to
b. Verify that the rear panel DC voltage control adjustment can be set
to 5 Vdc. Refer to
DC Power Supply
Test Set Control Bd.
PCB 1
12 / 15vdc
S10
-12 / -15vdc
+24vdc
3 / 5vdc
Switch Interface Bd.
PCB2
Test Set
Interface
Pass Thru
Interface
J1
J4
J2
J3
J9
Ext. DUT
Control
J11
J12
J14
J13
AC Line
Filter Assy
FS2
–
FS3
AC
IN
P10
S11
S20
J101
J100
P1
Active ON
LED (Frt.Pnl)
J16
J5
FAN
J15
Std.By
FS1
AC IN
*
**
J6
J7
J8
S21
S30
S31
S41
P11
P20
P21
P30
P31
P41
Front Panel
Active
9 / -10vdc
N.C.
Signal Path Name
Test Set Port Group
Ext Control Bd.
PCB3
(5, 15, -15vdc)
(3, 5, -12, 15, -15 Vdc)
-12 Vdc
(5 Vdc)
(3, 5, 15, -15, 24 Vdc)
NOTES:
*
The dc voltages shown, are functionally used by this part.
**
On board programmed Device.
*
**
*
*
*
S40
P40
Source ---- Receiver
5 - 9
–
13
–
17 - 21
Source ---- Receiver
6
–
10
–
14
–
18 - 22
Source ---- Receiver
7
–
11
–
15
–
19 - 23
Source ---- Receiver
8
–
12
–
16
–
20 - 24
RF Switch (24Vdc)
JTAG
J102
Keysight U3042AM20
20-Port Test Set
10 MHz
–
26.5 GHz
*
PCB7
Ports 8,12,16, 20, 24
LED (Frt.Pnl)
*
(5 Vdc)
PCB6
Ports 7, 11, 15, 19, 23
LED (Frt.Pnl)
*
(5 Vdc)
PCB5
Ports 6, 10, 14, 18, 22
LED (Frt.Pnl)
*
(5 Vdc)
PCB4
Ports 5, 9, 13, 17, 21
LED (Frt.Pnl)
*
(5 Vdc)
Содержание U3042AM20
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