Anritsu Company Site Master S312D, Maintenance Manual, Page: 44 / 62

3-3 Removal and Replacement Procedures Removal and Replacement
3-4 PN: 10580-00195 Revision B S312D MM
3-3 Removal and Replacement Procedures
Table 1-2, “List of Replaceable Assemblies” on page 1-3 provides a list of replaceable assemblies.
Important Information Regarding Service of Anritsu Equipment
Only qualified service personnel should attempt to perform repairs on this instrument. During the warranty
period, opening of the case by non-Anritsu Service personnel will void the warranty.
Extreme care must be used when handling internal assemblies. Careless handling will cause damage.
Unless authorized by the factory, no attempts should be made to repair a defective assembly. (Discharged RTC
batteries on the main PCB may be replaced). Exchange assemblies that are determined to have been damaged
by improper handling will not be accepted for credit.
Exchange Assemblies
The Base Assemblies and Option 5 PCB (as listed in Table 2-1 ) are factory-repairable exchange
assemblies, which should be returned to Anritsu promptly for credit. AC adapters, batteries, LCDs,
keypad parts and non-electrical parts are not exchange assemblies and need not be returned to Anritsu.
The Base Assembly consists of the main PCB and the spectrum analyzer assembly. They are a matched
set. Failure of either assembly requires a new Base Assembly consisting of a main PCB with a spectrum
analyzer PCB. Order the correct Base Assembly (determined by installed options) as shown in
Table 2-1 .
Return both the main and spectrum analyzer assemblies (without the Option 5 PCB) to Anritsu for
credit. After replacement, no recalibration is required.
If only Option 5 is found to be defective, then the Option 5 PCB should be removed from the main PCB
(as described in
Step 5 of Section 3-6 “Removal of the Main PCB, Option 5 PCB, Spectrum Analyzer
Assembly” on page 3-6 below) and returned to Anritsu. Do not return the main or spectrum analyzer
assembly if the problem is only with Option 5. After replacement of the PCB, no recalibration is required.
Note For all assemblies in the S312D, installation steps are the reverse of the removal steps.