Blease Test Procedure
Title: B.A.V. POWER SUPPLY PCB DocumentNo:129TP076 Sheet 3 of 5
4.4 Test Limits
These are provided on the Checklist and Calibration Record.
The battery volts for ops. 2, 3 & 4 may fall below the stated limits if the temperature of the
board under test (IC3) rises above 21
°
C.
For op. 12 the test limits (z+?) are referenced to the noted reading (z) for the unregulated
supply voltage.
5.0 TEST SCHEDULE
See 4.0 TEST DETAILS for information on the test equipment and its use. Also covered are
connection details, set ups, methods and test limits.
All operations in this section must be done in the order as written.
5.1 Preliminary
The board must NOT be attached to the test jig until operations 1 to 3 below are successfully
completed.
1. Set all Test Jig switches to uppermost toggled position.
2. Set external DC supply to 0 volts with a 100 mA current limit.
3. Perform a visual quality check of the new board assembly. In particular:
•
look for any defects in the overall assembly.
•
check in more detail any areas that have been reworked/repaired for any defects.
•
check the boards and assembly against the production drawings, in particular the issue.
•
check all connectors are firmly seated.
•
Check all integrated circuits which have been fitted into sockets are correctly fitted. (Right
way round, no bent pins, etc.)
•
check all links are fitted correctly.
LK1 is open.
LK2 and LK3 both have shorting links fitted.
5.2 No Load Voltages
With a current limit of 100mA set, slowly increase the external DC suppply voltage until the
jig UNREG +25V meter reads 17.0 Vdc. The external supply will be about 2 volts higher than
this.
Check there is no excessive supply current (< 100 mA) and that the jig BATT VOLTS meter
settles to between 13.3-13.7 Vdc. (See 4.4 Test Limits)
Increase the external supply current limit to 400 mA and then toggle the jig PCB MODE
switch to ON.
After a few seconds note the four supply voltages stated on the Checklist & Calibration
Record.
Note - the external supply voltage may need to be increased slightly to maintain a
constant test input voltage as shown on the UNREG +25V meter. This is mainly due to
losses caused by the external supply connection leads which should be kept as short as
possible.
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