Front Panel Assembly Removal And Replacement - Anritsu Spectrum Master MS2711D Maintenance Manual

If the value is lower than 80%, a discharge/charge cycle may be needed to improve the battery ca-
pacity. Completely discharge the battery, as described in Steps 5 and 6 below, and then recharge
the battery as described in Steps 1 and 2. If the battery capacity does not increase after a dis-
charge/charge cycle, replace the battery.
5. Press the
START CAL
note of the test start time.
6. When the Spectrum Master display fades and the Spectrum Master switches itself off, make note
of the test stop time.
7. The total test time (Step 5 to Step 6) should be ³ 1.5 hours. If the battery charge started at 80%
or more and the total battery test time is <70 minutes, replace the battery.

17. Front Panel Assembly Removal and Replacement

This procedure provides instructions for removing and replacing the Spectrum Master front panel as-
sembly. With the front panel assembly removed, the LCD display, keypad PCB, keypad membrane, and
main PCB assemblies can be removed and replaced.
NOTE: Many of the procedures in this section are generic, and apply to many similar instruments.
Photos and illustrations used are representative and may show instruments other than the Spectrum
Master.
1. Remove the external power supply, if installed, and remove the battery from the unit.
2. Place the Spectrum Master face up on a stable work surface.
3. Remove the four rubber corner bumpers by carefully lifting and sliding the bumpers off of the case
corners (Figure 11).
Figure 11. Removing the Corner Bumpers
4. With the bumpers removed, the access holes for the case screws are revealed. Use a Phillips screw-
driver to remove the four screws securing the two halves of the Spectrum Master case together.
5. Carefully lift up on the right side (as viewed from the front) of the front half of the case and begin to
separate the two halves.
Do not force or pull the two halves of the case apart completely, as there are delicate cables attached
between the two halves that must be disconnected first.
34
key (to keep the Spectrum Master from going into HOLD mode) and make
CAUTION
Spectrum Master MM