Test Procedure Ldps Board - Arachnid 1000 Series Information

TEST NUMBER
1. a. Check visually that no joints are unsoldered or look cold
and that there are no solder splashes.
Apply serial number to card, with permanent marker.
Use ohm-meter to check for good insulation between heat sink
2.
and the cases of all components mounted on it.
3. Turn RVl
Insert 5 Amp fuselink
On test set, set SW1 and SW2 to positions 1 (fully clockwise);
C.
Set SW3, 4,5,6 and 7 to the UP (off) position.
Connect voltmeter to test
d.
on a DVM or 25V range on a conventional meter.
Connect power to test set.
e.
f. Insert LDPS card under test into socket with component side of
board
4. a. Set SW3 and SW4 bo ON.
b. Rotate SW1 to position 2.
Rotate SW1 to position 3.
Rotate SW1 to position 4. Adjust RVl on LPDS board. so that
meter reads 5.10 volts.
a. Set SW5 to the ON position.
drop (to about 4.9V) in voltage.
After 1 minute touch the body of BR18 and also the surrounding
b.
area on the heat sink.
Set SW6 to the ON position.
C.
slight drop in voltage.
6. a. Short circuit the output terminals with a piece of wire or
screwdriver.
b. Set SW6, 5, 4 and 3 to the OFF position.
TEST PROCEDURE
-WITH LDPS TEST SET-
TEST
fully clockwise.
into holder.
facing forwards.
Meter to read about zero (less than l/4
LDPS BOARD
ROUTINE
Meter to read 10 to 11 volts.
Meter to read 9 to 10 volts.
meter to read 13 to 14 volts.
Meter will indicate a slight
Leave for 1 mintite.
Both should be gently and equally warm.
Meter will indicate a further
SILKSCREEN
ISSUES I..
range
volt).
Wait for 5 seconds.