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VIDEO OUTPUT RPQ HAP
PAGE
4 OF
5
039
(ENTRY POINT CC)
-Check the video signals as follows;
'Set the TEST/NORMAL s .. itch to TEST (green
characters fill the screen).
'Jumper D2Y02 to D2Y08 (on C4/D4 top-card
connector) to force reverse video.
-Set meter to 6Vdc range and negative l.ad
to any D08.
-Use pointed probe on positive lead to
probe the inner contact of each
BNe
video
socket in turn.
• Green video should be 1.1 to 1.4 Vdc.
-Red end blue video should be less than
0.5 Vdc.
'Press CONTROL
0
B (alpha keysl - see
Figure 2-3.
Tha test pattern turns blue.
-Check again:
'Blue video should now be 1.1 to 1.4 Vdc.
-Red and green video should be less than
0.5 Vdc.
'Press CONTROL C
'Press CONTROL
0
I (alpha keys) - see
Figure 2-3.
The test pattern turns red.
-Check again:
• Red video should no .. be 1.1 to 1.4 Vdc •
• Green and blue video should be less than
0.5 Vdc.
Are all Yoltages correct?
Y
N
040
• Remove cable in position C4.
-Use meter to check video signals at
pins C4B05(redJ. C4B06(greenl and
C4807Cbluel.
-Follow the sama procedure as in the
previous step.
Are all Yoltages now correct?
Y N
on
'Remove jumper D2Y02 to D2Y08.
-Reinstall cable in posi_tion C4.
-Exchange logic card C2.
GO TO PAGE 5, STEP 057.
ENTRY POINT FF.
42
'Remove jumper D2Y02 to D2Y08.
-Inspect cable removed from C4 for
breaks or shorts in the 3 coaxial video
cables.
-Exchange
any
failing FRU.
-Reinstall cable in position C4.
GO TO PAGE 5, STEP 057.
ENTRY POINT FF.
<,3
'Remove jumper D2Y02 to D2Y08.
'Set SYNC POLARITY switch to
't' .
• Measure voltage at SYNC output socket
(blackl.
IS the Yoltage between 1.5 Vdc and 2.0
Vdc:?
Y
N
J
K
K
HAP 1000-4
L
-Without removing the connector from
position C4, measure the voltage at
C4B04.
IS the voltage between 1.5 Vdc and 2.0
Vdc?
Y N
045
-Remove the cable-from position C4.
-Measure resistance between 802 and
D08 on the free end of the cable .
With the SYNC POLARITY switch set to
'+',
resistance should be about 0
ohms.
With the SYNC POLARITY switch set to
'-', meter should indicate an open
circuit.
Is
all correct?
Y N
046
'Inspect the cable assembly in
position C4 and the SYNC POLARITY
switch.
'Exchange any failing FRU .
-Reinstall cable
in
position C4.
-Exchange any failing FRU.
GO TO PAGE 5, STEP 057.
ENTRY POINT FF.
047
-Exchange logic card C2 .
-Reinstall cable
in
position C4.
GO TO PAGE 5, STEP 057,
ENTRY POINT FF.
048
-Inspect/exchange
the
cable
in
position
C4.
GO TO PAGE 5, STEP 057,
ENTRY POINT FF.
49
'Set SYNC POLARITY switch to '-'.
'Measure voltage at SYNC output socket.
Is the Yoltage between 0 Vdc and 0.4 Vdc?
Y N
050
'Inspect wIrIng of SYNC POLARITY switch.
(See Figure 6-13)
-Repair or Exchange any failing FRU.
GO TO PAGE 5, STEP 057,
ENTRY POINT FF.
051
(ENTRY POINT EEl
-Remove cable from position C4 .
• Set the TEST/NORMAL switch to NORMAL and
back to TEST.
'Pre.s CONTROL
0
8 (Alpha keys, see Figure
2-31.
Does the character pattern turn blue?
Y N
5 5
L M
04FEB81
HAP 1000-4
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