Service manual

Page 22
SVR-250 Service Manual
Flash Programming
The SVR-250 uses an Atmel 89C51RB2 microprocessor which contains the operating system. The chip can be
reprogrammed in-circuit using Atmel's FLIP software and a PC running Windows 2000 or XP. The FLIP software
can be downloaded from Pyramid's web site:
www.pyramidcomm.com/support
Warning- Do not attempt to re-flash the SVR-250 μP unless you are familiar with operation
of the SVR-250 and reasonably competent using Windows software. If the μP is not programmed
correctly, it can render the SVR-250 inoperable.
Install the software onto your PC; the download will include several config (.cfg) and hex data (.hex) files.
Ensure these are copied into the \Program Files\Atmel directory on your computer. Perform the flash
programming in the EXACT steps as outlined below:
Prior to starting the FLIP software, disassemble the SVR-250 by removing the 2 cap screws on the front panel.
Disconnect the front panel from the main PCB by unplugging the 2 cables. Remove the 2 cap screws from the
rear panel and carefully slide the entire assembly out of the extrusion. Reconnect the front panel to the main PCB.
Connect the radio cable to the SVR-250 and apply power. Connect the FY-4 DB9 connector to your computer
and the modular connector to P7 at the front of the SVR-250 main PCB; the channel indicator should show "PC".
Start the FLIP software. Install a shorting jumper onto J12.
Flash Program U3:
1. Press the Reset switch S2. In the FLIP software, press F4 (load config) and locate the Atmel directory on your
computer; select and load the SVR250.cfg file. The FLIP software will automatically establish communications
with the IC in the SVR-250. If it does not, wait until it times out, click OK to close the error message, check
the com port, cable etc., and start at the beginning of step 1. When FLIP is successful, it will populate the device
data fields on the right side of the PC screen. Do not change any of these settings!
2. On the left side of the screen, confirm the Erase, Blank Check, Program and Verify boxes are checked. In the
center of the screen, confirm the SVR-250.HEX file is loaded. Click the Run button to flash U3 with the hex
file. Each of the checked boxes will turn green in series as things progress. If any of them fail, verify all of
the connections as above and start over at step 1.
J12
Reset
,