Troubleshooting R&S SMU200A
1007.9845.82 3.36 E-6
Troubleshooting - Module SYNEX
Internal adjustment “Adjust Synthesis”
A comprehensive test of the module is to run the internal adjustment.
Error Error correction
Internal adjustment “Adjust Synthesis”
aborts at SSYN Adjustments.
Check performance and cabling of REF100 signal
If alright, first troubleshoot module SSYN.
Input and Output Signals
Connector,
System
Signal name Setting on Signal
Generator
Frequency Level Signal flow
X702, SMA SYNEX_OUT 750 to 1500 MHz 750 to 1500 MHz 5+-3dBm to SSYN
X703, SMA SYNEX_IN 750 to 1500 MHz 731to 1495.5 MHz 5+-3dBm from SSYN
X704, SMP REFVAR
Path A
B22, ref. internal
B22, ref. external
B20 fitted
10 MHz
40 MHz
104 MHz
3 V TTL to SSYN A
from SSYN A
from SSYN A
X705, SMP REF100 100 MHz
10±2 dBm
to SSYN
X706, SMP REF_DACB 12.8 MHz 13+-3 dBm to DACIF
X707, SMP REF_LPN2
Path A
Ref. internal
Ref. external
10 MHz
40 MHz
3 V TTL to SSYN A
from SSYN A
X708, SMA REF1200 <200 MHz 1200 MHz
10±2dBm
to IQOP3
Error messages concerning the module SYNEX
Error message Error correction
"Synthesis-extension: OCXO 10 MHz oven
cold"
If this message doesn’t vanish after 10 minutes,
OCXO is defective, change the module.
"Synchronization error on external
reference"
"Synthesis-extension: Reference PLL
unlocked"
Check for correct External Reference Frequency
setting and corresponding input signal.
If input signal and frequency settings are correct and
error message is displayed anyhow, change the
module.
"Synthesis-extension: fm-loop PLL
unlocked"
Check for correct input signals from SSYN
If input signals are correct and error message is
displayed anyhow, change the module.
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