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G H
3 3
128
FEATURE HAP
PAGE
4 OF
8
-Turn the Security Key fully
counterclockwise.
-Use
a logic probe to check the
following pins:
C2GG3 should be DOWN - Keylock.
C2J04 should be DOWN-Keylock installed.
Are they correct?
V N
029
-Switch power OFF
~.
-Check the switch and its associated
wiring.
-See Figure 6-8.
-Repair or exchange failing FRU.
-GO TO MAP 0000. ENTRY POINT BB.
030
-Exchange logic card D2.
-GO TO MAP 0000. ENTRY POINT BB.
31
(ENTRY POINT DDI
If the Selector Pen feature is NOT
installed, take the Y path now.
-If logic
card
G4
(selector pen) was
removed earlier, Switch power OFF
~
and
reinstall i t ..
Test the operation of the Selector Pen as
follows:
-Run ONLINE TEST 0 (see page
1).
-Set the brightness control to an
acceptable level.
·Press the pen against the white ?SEl PEN
field in line 2.
The field changes to >SEL PEN.
-Press the pen against the blue >SEl PEN
field in line 3.
The field changes to ?SEL PEN.
-If )(-f appears in the indicator row,
press RESET and retry.
Did all occur as expected?
Y N
032
-Turn the Brightness control to mid
position.
-Press the ligh.t
pen
tip (do not point
it at the screen).
The blue characters should become bright
(they may only flash) but the red and
green should not change.
Does this occur?
Y N
7 5
J
K
HAP 0800-4
L3
-Meter TP
'J'
on the amplifier card.
See
Figure 6-10.
-Check using table below.
-Use brightness potentiometer mounting
plate as meter ground.
PEN TIP.
EXPECTED VOLTAGE.
RELEASED
0
Vdc - 0.2 Vdc
PRESSED
1.0 Vdc - 1.
5
Vdc
Are the
voltag~5
correct?
Y N
034
-Meter the light pen switch voltages.
The table below shows the expected
voltages.
PEN
YElLOW
WHITE
TIP
G5B12
G5Dll
RElEASED
1.8 Vdc
o
Ydc
PRESSED
o
Vdc
2.2 Vdc
Are the voltages correct?
Y N
035
-Open up the selector
pen.
-Verify the continuity oT the
3
connections to the light pen switch.
See Figure 6-13.
Cl)
St~ITCIl
n/o (yello,,) G5B12
(2)
SWITCH n/c (white)
G5D11
(3)
SWITCH common
G5D08
(coaxial cable shield)
-Verify correct operation of the
switch.
HOTE: the separate ground connector on
the selector pen cable is only
connected to a cable shield.
-Isolate to wiring or selector pen.
If no problem found, exchange
selector pen logic card G4.
GO TO MAP 0000. ENTRY POINT BB.
36
-Switch power OFF
~.
-Check continuity of blue bright-up
signal from TP
'J'
on the amplifier
card
to
P18-3 through to C2U02.
See
Figure 6-7.
-Check for short to ground.
Is connection good?
VI
;~~pa
i r or exchange fa
11
i ng FRU.
GO TO MAP 0000. ENTRY POINT BB.
038
Switch power ON
m.
-Set up the ONLINE TEST 0 pattern.
Are blue characters always bright (not
controlled by the brightness controll?
I i
555
M N P
04FE881
HAP 0800-4
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