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Maintenance
Fable 7-9
Light
pen
checks
Step
Item/component
Signal
Comments
1
U9
pin
23
SELECT VIA
The
following
digital
board
signals are
referenced
to digital
common.
Low
going
pulses
(IkHz).
2
U23
pin 12
SENSEPULSE
Low
going
pulse (15psec)
when
light
pen
is
pointed
at
lit
3
U23
pin 9
LPSWITCH
LED.
Low
logic level
when
light
pen button
is
pressed.
4
U9
pin 17
LPSENSE
High
going
pulse
when
light
pen
button
is
pressed
and pen
is
5
U9
pin
39
LPRESET
pointed
at
an
LED.
Multiple high going pulses
when
light
pen
button
is
pressed.
Table 7-10
Master/slave checks
Step
Item/component
Signal
Comments
1
U1
1
pins 3,4
RXCLK,
TXCLK
The
following
digital
board
signals are
referenced
to
digital
common.
When
troubleshooting a
single unit,
loop
a cable
from
Master/Slave
Out
to
Master/Slave
In
of
the
same
unit,
then
program
unit as master.
895kHz
square wave.
2
Ulipin9
SELECT ACIA
Low
going
pulses with
manual
triggers.
3
Ull
pins 2,6
RXDATA,
TXDATA
Low
going pulse
pair
with
manual
trigger.
4
Un
pin
7
FIRQ
Low
going pulse with
manual
trigger.
5
U10pin23
SELECT
PIA
Low
going
pulses (IkHz).
6
U
10 pin
39
M/S
TRIGGER
High
going
pulses
when
program
#3
is
running. (Triggering
stops
when
Relay Step
equals 100.)
7-13
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