Star Tech Journal

OCTOBER
1 998
to energize the Coil(s) or
Flash Lamp(s).
There are two test points,
TPLl FET for the MOSFET
Transistors and TPL3 for the
TIP Transistors. To use the
Test Point take a Jumper Wire
and connect it to the Test
Point for the associated
MOSFET or TIP Transistor
you will be testing. Since
we're using Q14 as an ex-
ample, we will only use the
TPLl FET Test Point. Then
take the other end of the
Jumper and locate the Resis-
tor for the Transistor ( they are
identified with a white stripe).
In this example, Q14, the cor-
responding Resistor would be
Lower Right Corner
Portion of the
1/0 Power Driver Board
(White Star Board System)
BRIDGE
BRDG21
STAR*TECH JOURNAL
R14. The Resistors corre-
spond numerically to the
Transistors. Use TPLl FET
Test Point for Resistors Rl-
R16 & TPL3 TIP Test Point
for Resistors R17-R32. Note:
For TIPs Q17 thru Q24 use
the White Stripe End of the
Resistors R200 thru R207.
Momentarily touch the Resis-
tor (R14) at the solder pad
at/ on the White Stripe End
( this is known as manually
driving a coil). PLEASE
NOTE: DO NOT TOUCH
THE
TRANSISTORS
WITH THE JUMPER
WIRE WHILE CON-
NECTED TO EITHER
TEST POINT. If the Coil
does not energize, the Q14
Transistor is BAD and will
need to be replaced. If the
Coil does energize, the prob-
lem is in the Logic Circuity
before the Drive Transistor of
the I/O Board. At this point,
it is suggested that the I/O
Board should be replaced &
sent in for repair. When you
check R14, also check the
neighboring Resistors (R12,
R13, R15 & R16) and notice
how the neighboring coils fire
so you know you are per-
forming the test correctly.
Any questions or concerns
please contact Technical Sup-
port at 1-800-542-5377 or
1-708-345-7700.