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T
5
FEATURE HAP
PAGE
6
OF
8
155
NOTE: The light pen tip for Model 2 is P/N
2570128 (large lens) and for Model
3
1742655.
-See Figure
6-13
throughout these tests.
-Switch power OFF
~.
-Disconnect the selector pen logic gate
connector
05.
-Switch power ON
~.
-Meter the following pins: G5D10 (+12
V)
and G5B08 (-12 V).
Use G5D08 as GND.
Are the voltagas present?
Y N
U
056
-See Figure
6-10.
-Meter the amplifier card test points M
(+12 V dc) and N (-12 V dc).
Are both voltages present?
Y N
057
-Switch power OFF
~.
-There must be a convergence problem.
S~e
Figure 1-2 and Figure 6-16 to
check wiring.
GO TO MAP 0000, ENTRY POINT BB.
osa
-Switch power OFF
~.
-Reseat the logic gate AS connector and
PI8 on the amplifier card and check the
~12
V and -12 V wiring.
(See Figure
6-16)
H3S the problem gone?
Y N
059
One (or both) of the fused resistors
on the amplifier card has failed.
This will have been caused by an
overload or short circuit on the +/-12
V supplies to the amplifier card.
CAUTION
Do not insert a new amplifier
card until the cause of the
overload has been repaired.
-Switch power OFF
~.
-look for
a
short circuit in the +12 V
and
-12 V
wiring from the amplifier
card to the selector pen card.
(See
Figure 6-16.)
-Repair any problem found.
If there
is no
wiring problem, exchange the
selector pen logic card
(G4).
-Exchange the amplifier card.
GO TO MAP 0000, ENTRY POINT BB.
060
GO TO MAP 0000, ENTRY POINT BB.
U
"AP 0800-6
L
-Reinstall the selector pen and card (G4)
if removed.
Have you seen any of the following error
codO!s on the screen or in the error log
for the display: 44, 61 or 222
!
(See MIM
section 2.6.2)
Y N
062
-Probe C2S05 and press the selector pen
tip.
The DOWN light should come on and
remain on as long as the pen tip is
pressed.
Does this occur!
Y N
063
-Use your probe to verify the
conditions shown in the table below.
PIN ON
SEL. PEN SWITCH
LOGIC
GATE
PRESSED
RElEASED
G5B12
DOWN
---
yellow
G5Dll
UP
DOWN
white
G5D08 is
ground
Are they correct?
Y N
064
-Exchange the selector pen then
logic card G4.
GO TO MAP 0000, ENTRY POINT BB.
065
-Exchange the selector pen logic card
G4 (then C2 then D2).
GO TO MAP 0000, ENTRY POINT BB.
066
-Enter Test 0 - Hold down the ALT key,
press the
rEST
key, release both.
-Probe
C2S05 and use the
pen to
select
each of the 4
pen-detectable fields in
the
test pattern.
-Each time,
press and hold the pen
against
the
screen at the correct
posi ti on.
The DOWN
Ii
gilt Wi
11
come on
and remain on until the field is
sensed.
(The white bars shbuld
also
di sappear.)
NOTE: If )(-f appears in the indicator
row, press RESET and retry.
The red SEL
PEN field and the blue &SEL PEN field
will normally cause ){-f to appear.
Were all
~
of the fields sensed
correctly?
Y N
777
V W X
04FEB81
KAP
OaOO-6
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