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CONVERGENCE HAP 0600
PAGE
1 OF
ENTRY POINTS
FROM
ENTER THIS MAP
MAP
ENTRY
PAGE
STEP
NUMBER
POINT
NUMBER
NUMBER
0100
A
001
0800
A
001
0800
EE
009
001
If the BATTERY or some circuits on the
convergence logic card B2 are failing, an
error code 55 or 228 will appear on the
screen when the 3279 is switched on.
(The
3279 may have to be switched off for some
hours before an error is generated.) The
error code will be resettable (RESET key)
and the operator could converge the screen
using ONLINE TEST
7.
The battery is marked with its date (mmyy
- month and year) and would be suspect
if
more than 3 years old.
Some other failures will cause error codes
55, 56, 228, or 229 to appear but will HOT
be
reset table.
(ENTRY POINT A)
-Connect the 3279 to a control unit and
ready it.
Do any of these error codes appear at any
time: 55.56. 223. or 229 ?
Y N
002
-Enter the convergence routine (see MIM
section 5.3.3)
and attempt to converge
EACH of the 13 positions.
Could you do so?
Y N
003
Did the convergence pattern appear in
the correct colors?
Y
I
;~~Change
logic card B2 (then D2).
GO TO MAP 0000. ENTRY POINT BB.
005
The convergence patterns should have
moved smoothly when you pressed the
cursor keys in step 002.
Was there ANY movement?
Y
I
~g6TO
STEP 009,
ENTRY POINT EE.
007
Was the movement always smooth?
Y N
5 4
ABC D
Copyright IBM Corp 1981
C 0
HAP 0600-1
j
!~~Change
logic card B2 (then D2).
GO TO MAP 0000. ENTRY POINT BB.
09
(ENTRY POINT EEl
-Meter the amplifier card test points as
shown in the table below and
ve~ify
that
the correct voltages are present.
-See Figure 6-10 for locationst and Figure
6-16 for circuit.
AMPLIFIER
VOLT AGES AND
CARD
TOLERANCES
TEST POINT
M
+12 Vdc ±1.5 V
N
-12 Vdc !!.5 V
K
(fused)
+12 Vdc !1. 5 V
Use B2D08 as
your meter ref.
Are the correct voltages present?
Y N
010
IS the voltage only wrong at test point
'K'?
Y N
011
-Probe the power supply card edge
connector (P3) pins as shown in the
table below.
Power Supply Card
P3
VOLTAGES AND
Connector
TOLERANCES
1
+12 Vdc H.5V
3
-12 Vdc H.5V
Use P3-2
as meter ref.
Are the correct voltages present?
Y N
222
E F G
012
If only the -12 V supply was lost
the fuse on the amplifier card may
have fai led.
-Switch power OFF
~.
-Exchange the fuse
if
necessary.
-Switch power ON
~.
-If the fuse fails again (or
if
it
was good), switch power OFF
~
and
remove the power cord from the
mainline power socket and exchange
the power supply.
GO TO MAP 0000. ENTRY POINT BB.
04FEB81
HAP 0600-1
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