uniphy Phyaction V, Service Manual

Page: 9 / 18

Service manual Phyaction V
Service manual version 0.1 Page 9
7. Hardware labels.
Each PCB (except the display PCB and the power supply) has a label with the hardware code
which GymnaUniphy sticks on the PCB during production.
The main PCB consists of an eeprom in which the actual hardware code of the used PCB is
saved.
The hardware code consists of 4 characters and is composed as follows (from left to right):
0…
From 1 to 9. Increase in case of a
principle technology change. Hardware is not compatible
anymore.
All previous changes made in
hardware shall be inherited in
the new layout. The last 3
alphanumerical numbers will
begin with A
.A..
A to Z Increase in case of a
principle technology change. Components are not anymore
compatible with the previous
layout. All previous changes
made in hardware shall be
inherited in the new layout. The
last 2 alphanumerical numbers
will begin with A
..A. A to Z Increase in case of
component change.
…A
A to Z Increase in case of a PCB
track change.
Example:
Suppose that resistor R68 changes from 22 K to 100 K.
The actual hardware version 1AAA will be upgraded to 1ABA.
7.1 Upgrading the hardware code.
Every hard-or software change will be presented in a technical bulletin. In case of a hardware
change GymnaUniphy will provide the necessary components as well as a new hardware label.
This label must be put on the upgraded PCB.