Main Pcb Assembly Replacement - Anritsu Spectrum Master MS2721A Maintenance Manual

7. Main PCB Assembly Replacement

This procedure provides instructions for replacing the Main PCB assembly. The Main PCB assembly is located in the
front panel half of the instrument.
NOTE: The Main PCB assembly and the Spectrum Analyzer module are always replaced as a set.
1. Open the Spectrum Master case as detailed in Section 6.
2. Disconnect the Fan connector at
3. Disconnect the Encoder Knob connector at
4. Use a Phillips screwdriver to remove the nine screws securing the main PCB assembly to the Front Panel section.
Figure 12. Main PCB Assembly Mounting Screws
5. Lift the bottom edge of the Main PCB assembly and disconnect the battery connector from
ENCODER KNOB
Figure 13. Main PCB Assembly Replacement
6. Pull the Main PCB assembly down and out of the Front Panel section, taking care to slide the Compact Flash mod-
ule clear of the case.
7. Replacement is the reverse of removal. Take care to insure that the connector on the Main PCB aligns with the con-
nector on the Keypad PCB coming through the front panel.
Spectrum Master MM
on the Main PCB assembly.
J1002
J501
RTC BATTERY
CONNECTOR
FAN
CONNECTOR
BATTERY
CONNECTOR
on the Main PCB assembly.
REMOVE
SCREWS
COMPACT FLASH
MODULE
on the main PCB.
J1001
29