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SECTION 3 - MICROBOARD 031-01730-000
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
3
There are five steps to the boot-up process. During
the boot-up process, there is a visual indication as
each step is performed, followed by a pass/fail status
of the step. On the microboard, a green LED (CR17
- Pass) flashes to indicate the step was successful. If a
step is unsuccessful, a red LED (CR18 - Fail) flashes
and the boot-up process terminates. The execution and
pass/fail status of Steps 3 through 5 are displayed on
a white keypad display screen as they are performed.
This white display screen also lists the BIOS EPROM
version. The steps of the boot-up process are listed in
the following heading along with the LED activity as-
sociated with each step.
BOOT-UP STEP AND DESCRIPTION
The steps of the boot-up process are as follows:
1.
First initiate table complete
Registers in the microprocessor are configured to al-
low it to perform basic memory read/write functions.
2.
FPGA configuration
The Field Programmable Gate Array (FPGA) is
configured to process Digital inputs and Outputs.
3.
Mini-card signature test
A location in the Flash memory card that contains
a code identifying the Manufacturer is compared
to other locations that contain the manufacturer’s
name. If these values are the same, it is “pass”. If
they are different, it is “fail”.
4.
Mini-card checksum
The Flash memory card checksum is calculated
and compared to the checksum value that is stored
in the Card at the time the Card was initially pro-
grammed at the YORK factory. If both values are
the same, it is considered “pass”. If the calculated
value is different than the stored value, it is con-
sidered “fail”.
5.
BRAM quick test
Test data is written to and then read from several
memory locations to verify BRAM operation.
LED Indicators
When power is applied to the OptiView Control Cen-
ter, both the red (CR18 - Fail) and green (CR17 - Pass)
LED's simultaneously illuminate for 1 second, then the
Boot-up process begins in the following sequence:
TABLE 2 -
BOOT-UP LED INDICATORS
STEP
PASS
FAIL
1
Green on, Red off
Watchdog will initiate
a re-boot.
2
Green flash once
Boot-up process halts.
One red flash repeating.
3
Green flash once
Boot-up process halts.
Two red flashes repeating.
4
Green flash once
Boot-up process halts.
Three red flashes repeating.
5
Green flash once
Boot-up process halts.
Four red flashes repeating.
When all steps have been completed, the LED’s will
then illuminate or extinguish, as long as power is ap-
plied, according to the settings of Microboard Program
Switches 7 and 8 as follows:
Green (CR17)
Program SW 7 set to 50Hz – extinguishes
60Hz – illuminates
Red (CR18)
Program SW 8 set to Standard – illuminates
Enhanced – extinguishes
The
BRAM
(battery backed random access memory)
is a memory device that contains a battery that pre-
serves the data during power failures. It is a replaceable
part. Refer to
YORK Renewal Parts - OptiView Con-
trol Center (Form 160.54-RP1)
. It is located in socket
location U52. The microprocessor stores the setpoints
programmed by the Operator or Service technician,
History Data and other data that requires preservation,
in this device. Also, the day of week, time of day and
calendar date time-keeping are done here.
