SIGLENT TECHNOLOGIES SNA5000A Series User manual

SIGLENT TECHNOLOGIES CO.,
LTD
Service Manual SM09050-E01B
SNA5000A Series
Vector Network Analyzer

1SNA5000A Vector Network Analyzer Service Manual
Copyright
SIGLENT TECHNOLOGIES CO., LTD All Rights Reserved.
SIGLENT is the registered trademark of SIGLENT TECHNOLOGIES CO., LTD.
Information in this publication replaces all previously corresponding material.
SIGLENT reserves the right to modify or change parts of or all the specifications
or pricing policies at the company’s sole decision.
Any method of copying, extracting, or translating the contents of this manual
is not allowed without the permission of SIGLENT.

SNA5000A Vector Network Analyzer Service Manual 2
Copyright................................................................................................................................ 1
1. Safety Summary........................................................................................................... 8
Safety Symbols................................................................................................................. 8
General Safety Considerations .................................................................................... 9
Safety Earth Ground.................................................................................................... 9
Servicing....................................................................................................................... 10
Electrostatic Discharge Protection............................................................................ 10
2. General Information.................................................................................................. 11
Maintenance.................................................................................................................... 11
Applicable Model and Options .................................................................................. 11
Recommended Test Equipment................................................................................. 12
Alternative Test Equipment ........................................................................................ 15
Support, Services, and Assistance............................................................................ 16
Information on the Following Topics is Included in this Section................. 16
Service and Support Options.................................................................................. 16
Contacting SIGLENT ................................................................................................... 17
Shipping Your Analyzer to SIGLENT for Service or Repair............................. 18
3. Service Guide............................................................................................................... 20

3SNA5000A Vector Network Analyzer Service Manual
Before You Begin ........................................................................................................... 20
Operating Environment ........................................................................................... 20
Protect Against Electrostatic Discharge (ESD)................................................... 22
Allow the Analyzer to Warm Up............................................................................ 22
Preliminary Self Test..................................................................................................... 22
PV.................................................................................................................................... 22
Adjustment .................................................................................................................. 24
Service Process............................................................................................................... 25
4. Performance Tests..................................................................................................... 36
About Performance Tests ............................................................................................ 36
Instrument Specifications........................................................................................ 36
Certificate of Calibration.......................................................................................... 36
Performance Tests......................................................................................................... 37
Performance Test of the Test Environment........................................................ 39
PV Test........................................................................................................................... 47
Test Log......................................................................................................................... 49
5. Adjustments ................................................................................................................ 51
Adjustments .................................................................................................................... 51
Adjustments of the Test Environment ................................................................. 52

SNA5000A Vector Network Analyzer Service Manual 4
Adjustments Procedure............................................................................................ 60
Test Log......................................................................................................................... 63
6. Troubleshooting......................................................................................................... 65
Power Up Troubleshooting......................................................................................... 65
Power Supply Check.................................................................................................. 67
If the Fans Are Not Operating ................................................................................ 75
Troubleshooting LCD Display Problems.............................................................. 77
Front Panel Troubleshooting...................................................................................... 78
Front Panel Keypad and RPG Test ........................................................................ 79
Display assembly Test.............................................................................................. 82
Checking the USB Board .......................................................................................... 86
Rear Panel Troubleshooting....................................................................................... 87
About QC Automatic detection .............................................................................. 87
Checking the USB Device Ports Troubleshooting ............................................. 89
LAN Troubleshooting................................................................................................ 89
Optional Bias-Tees x4 Troubleshooting.............................................................. 92
10MHz Ref Signal Output Troubleshooting........................................................ 93
Trigger OUT Troubleshooting................................................................................. 94
10MHz Ref Signal Input Troubleshooting........................................................... 95

5SNA5000A Vector Network Analyzer Service Manual
Trigger In Troubleshooting ..................................................................................... 96
OCXO Troubleshooting............................................................................................. 97
Instrument Block Diagram ........................................................................................ 100
7. Replaceable parts.................................................................................................... 101
Assembly Replacement Sequence ......................................................................... 101
Replaceable Parts Listings........................................................................................ 102
Front Panel Assembly, Front Side....................................................................... 103
Front Panel Assembly, Back Side........................................................................ 104
Top Assemblies, Front Side, 2 port..................................................................... 106
Top Assemblies, Front Side, 4 port..................................................................... 107
Top cables, Back Side，2 port.............................................................................. 110
Top Assemblies, Back Side，4 port .................................................................... 113
Top cables, Back Side，4 port.............................................................................. 114
Rear Assemblies....................................................................................................... 117
8. Replacement procedure ........................................................................................ 120
Personal Safety Warnings......................................................................................... 120
Electrostatic Discharge (ESD) Protection .............................................................. 121
Assembly Replacement Sequence ......................................................................... 121
Replacement Procedures .......................................................................................... 122

SNA5000A Vector Network Analyzer Service Manual 6
Removing the Covers.............................................................................................. 123
Removing and Replacing the Front Panel Assembly.................................... 124
Removing and Replacing the A2–A5 and Other Front Panel
Subassemblies.......................................................................................................... 126
Removing the Display Assembly ........................................................................ 126
Removing the Keypad Assembly A4.................................................................. 127
Removing and Replacing the Rear Panel Assembly..................................... 127
Removing and Replacing the A6–A12 and Other Rear Panel
Subassemblies.......................................................................................................... 129
Removing and Replacing the A9 AC-DC POWER SUPPLY ............................ 131
Removing and Replacing the A8 Power filter board .................................... 131
Removing and Replacing the Fan A7 ................................................................ 132
Removing and Replacing the OCXO Adapter panel A11 ............................. 132
Removing and Replacing the bias panel A12................................................. 133
Removing and Replacing the IOB panel A6..................................................... 133
Removing and Replacing A3 USB Panel........................................................... 134
Removing and Replacing A16 N adapter Assembly ..................................... 135
Removing and Replacing A1 Mb Panel............................................................. 136
Removing and Replacing A15 LO Panel ........................................................... 137

7SNA5000A Vector Network Analyzer Service Manual
Removing and Replacing A13 TX Panel 1 OR A14 TX Panel 2.................... 138
9. CPLD Version Programming of LO Board.......................................................... 141
Connecting the Programmer.................................................................................... 141
Installing the Programming Software................................................................... 143
Programming the CPLD.............................................................................................. 144
10. More Product Information...................................................................... 148

SNA5000A Vector Network Analyzer Service Manual 8
1.Safety Summary
This section contains information and warnings that must be observed
to keep the instrument operating under the corresponding safety
conditions. In addition to the safety precautions specified in this section,
you also have to follow common safe operating procedures.
Safety Symbols
When the following terms or symbols appear on the front panel,
rear panel, or this manual, it indicates particular attention should be
paid.
Indicates potential injuries or hazards that may happen.
Indicates electric shock that may happen.
Indicates measurement grounding
Indicates safety grounding.
This is a start/standby switch. Press the switch, the VNA will switch between the working
state and the standby state. The switch could not power off the device, to completely
power off the VNA, the power cord must be removed from the AC socket.
Indicates “AC”.
CAUTION
Indicates potential damages to the instrument or other property that may happen.
WARNING
Indicates potential injuries or hazards that may happen.

9SNA5000A Vector Network Analyzer Service Manual
General Safety Considerations
Safety Earth Ground
The instrument includes a grounded cord set containing a molded
three-terminal polarized plug and a standard IEC320 (Type C13)
connector for making line voltage and safety ground connection. The AC
inlet ground terminal is connected directly to the frame of the instrument.
For adequate protection against electrical shock hazard, the power cord
plug must be inserted into a mating AC outlet containing a safety ground
contact. Use only the power cord specified for this instrument and
certified for the country of use.
Warning: Electrical Shock Hazard!
Any interruption of the protective conductor inside or outside of the scope, or disconnection
of the safety ground terminal creates a hazardous situation.
Intentional interruption is prohibited.
The position of the oscilloscope should allow easy access to the
socket. To make the oscilloscope completely power off, unplug the
instrument power cord from AC socket.
The power cord should be unplugged from the AC outlet if the scope
is not to be used for an extended period of time.
CAUTION: The outer shells of the front panel terminals (CH1, CH2, CH3, CH4, EXT) are
connected to the instrument’s chassis and therefore to the safety ground.

SNA5000A Vector Network Analyzer Service Manual 10
Servicing
These servicing instructions are for use by qualified personnel only。
To avoid electrical shock, do not perform any servicing unless you are
qualified to do so。
Electrostatic Discharge Protection
Protection against electrostatic discharge (ESD) is essential while
removing assemblies from or connecting cables to the network analyzer。
Static electricity can build up on your body and can easily damage
sensitive internal circuit elements when discharged。Static discharges too
small to be felt can cause permanent damage. To prevent damage to the
instrument:
Always have a grounded, conductive table mat in front of your test
equipment.

11 SNA5000A Vector Network Analyzer Service Manual
2.General Information
Maintenance
To prevent electrical shock, disconnect the analyzer from the mains source
before cleaning. Use a dry cloth or one slightly dampened with water to clean
the external case parts. Do not attempt to clean internally。Clean the cabinet,
including the front panel, using a dry or slightly damp cloth only.
Applicable Model and Options
Options
Status
Description
2 Port Option
4 Port Option
5002A
Action
2-port Test Set
9KHz-4.5GHz
YES
NO
5012A
Action
2-port Test Set
9KHz-8.5GHz
YES
NO

SNA5000A Vector Network Analyzer Service Manual 12
5004A
Action
4-port Test Set
9KHz-8.5GHz
NO
YES
5014A
Action
4-port Test Set
9KHz-8.5GHz
NO
YES
Recommended Test Equipment
Equipment
Critical
Specifications
Device brand
Recommended Model
or Part Number
Test Instruments
and Software
N/A
N/A
EasyVNA
Signal generator
30MHz
SIGLENT
SDG1000X
Power meter
8 kHz -18 GHz
-70 dBm- +23 dBm
ROHDE&SCHWARZ
NRP18A（ROHDE&SCHWARZ）
Frequency meter
30MHz
SIGLENT
SDG1000X

13 SNA5000A Vector Network Analyzer Service Manual
Spectrum
analyzer
26.5GHz
RBW:1Hz
SIGLENT
SSA5000A
Mouse
N/A
Any
Any
Keyboard
N/A
Any
Any
Display
N/A
Any
Any
Calibration and
Verification Kits
Open(M),Short(M),
Match(M),Through
(M-M), 50 Ω,
9 GHz
SIGLENT
F504MS
Cables
0-18GHz
Rosenberger
L72-C1807-1000(Rosenberger)
1m N(M)-SMA(M)
Adapters
DC～18GHz
Any
Any
VTS18
9KHz-18GHz
SIGLENT
VTP18
VTS18
9KHz-18GHz
SIGLENT
VTC18

SNA5000A Vector Network Analyzer Service Manual 14
Oscilloscope
100 MHz
SIGLENT
SDS1000X-E 4
Power supply
32V /1mV
SIGLENT
SPD3303
Digital multi-
meter
N/A
Any
Any
T-10 TORX driver
N/A
Any
Any
T-20 TORX driver
N/A
Any
Any
20 mm, open-
end torque
wrench
0.9 N-m (8 in-lb)
setting (for
measurement
port connections)
Any
Any
9-mm, socket or
open-end
wrench
Any
Any
wrench
Any
Any
ESD grounding
N/A
Any
Any

15 SNA5000A Vector Network Analyzer Service Manual
wrist strap
Alternative Test Equipment
Equipment
Critical
Specifications
Device brand
Recommended Model
or Part Number
F604TS
3.5 mm Open (M,F),
Short (M,F),
Match/Load (M,F
50 Ohms), Through
(M-M, M-F, F-F), DC
–9 GHz
SIGLENT
Any
Cables
NMD 3.5 female-
NMD 3.5MM Male
DC-26.5GHz
Any
V26-N35MN35F-25IN
Cables
NMD 3.5 female-
APC 3.5MM female
DC-26.5GHz
Any
V26-N35FA35F-25IN

SNA5000A Vector Network Analyzer Service Manual 16
N-N-18L
18GHz Bandwidth
Length 1.0m
Any
Any
N-SMA-18L
18GHz Bandwidth
Length 1.0m
Any
Any
N-BNC-2lL
2GHz Bandwidth
Length
0.7m(26.7inches)
Any
Any
Support, Services, and Assistance
Information on the Following Topics is Included in this
Section
- Service and Support Options
- Contacting SIGLENT
- Shipping Your Analyzer to SIGLENT for Service or Repair
Service and Support Options
The analyzer’s standard warranty is a one-year return to SIGLENT

17 SNA5000A Vector Network Analyzer Service Manual
Technologies service warranty.
Contacting SIGLENT
America
SIGLENT Technologies NA, Inc
6557 Cochran Rd Solon, Ohio 44139
Tel: [phone]
Toll Free: 877-515-5551
Fax: [phone]
[email protected]
www.siglentna.com
Headquarters
SIGLENT TECHNOLOGIES CO., LTD.
Blog No.4 & No.5, Antongda Industrial Zone, 3rd Liuxian Road, Bao’an

SNA5000A Vector Network Analyzer Service Manual 18
District,
Shenzhen, 518101, China.
Tel: + 86 755 3688 7876
Fax: + 86 755 3359 1582
[email protected]
www.siglent.com/ens
Europe
SIGLENT TECHNOLOGIES EUROPE GmbH
Liebigstrasse 2-20, Gebaeude 14, 22113 Hamburg Germany
Tel: [phone]
Fax: [phone]
[email protected]
www.siglenteu.com
Shipping Your Analyzer to SIGLENT for Service or Repair