7-3 Bootload Mode Chapter 7 — Firmware Updates
7-2 PN: 13000-00164 Rev. K ML248xx, ML249xA MM
7-3 Bootload Mode
If power is lost during programming or the EPROM has been corrupted in some way, the power meter can be
forced into a special “bootload” mode and reprogrammed. See Figure 7-1 for jumper location.
1. With AC power disconnected, open the unit by loosening the six captive screws on the underside and
separating the top half of the case from the base. Ensure that the front and rear panels remain firmly in
place during this step.
2. Connect the computer serial COM port to the power meter back panel RS-232 serial connector, using the
Anritsu Serial Interface cable (Anritsu P/N: B41323) or equivalent (see Section 7-4).
3. Install a jumper (Anritsu P/N: 551-577) to J805 (BOOTSTRAP) located to the rear right hand side of the
Control PCB board. This will force the power meter into the bootload mode when power is applied.
4. Apply AC power to the power meter.
5. Go to Step 4 of “Running the Program” on page 7-1 and load the program as described.
6. Remove power from the meter and remove the jumper.
7. Replace the top cover, taking care not to over tighten the captive screws (50Ncm).
Caution
The procedure in this section should be performed by qualified technical personnel only. This
procedure requires access to internal components and care should be taken to avoid contact with
potentially hazardous voltages.
Figure 7-1. Location of J805
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