AMSTRAD PC1512 Service Manual page 27

ALIGNMENT
INSTRUCTIONS FOR PC-MM
Equipment
required:
Digital
Multimeter;
Dummy
Load;
0.82ohm/30W
D.B.O.Scope; Diagnostic
Disc/Tool.
Step
FUNCTION SIGNAL
IN
SIGNAL
OUT METHOD
REMARKS
1.
To Set +5V.
Power
Supply.
Test Point
A.
Adjust
VR505
to read
5.10V ±0.02V.
1)
Refer
to Fig. 3.
2)
Prevent
short
circuit
when
pulling
the
PCB
forward.
2
To
set+12V
Power
Supply.
Test Point
B.
Adjust
VR504
to
read
1
2.1
5V
±0.02V.
1)
Refer
to Fig. 3.
2)
Prevent short
circuit
when
pulling
the
PCB
forward.
3.
To
Set -5V.
Power
Supply. Test
Point
C.
Adjust VR501
to
read 5V
±0.05V.
1)
Refer
to Fig. 3.
2)
Prevent
short circuit
when
pulling
the
PCB
forward.
4.
To Set -12V. Power
Supply. Test Point
D.
Adjust
VR502
to
read
1
2.0V
±0.05V.
1)
Refer
to Fig. 3.
2)
Prevent
short circuit
when
pulling
the
PCB
forward.
5.
To
set protect
adjustment.
Power
Supply.
Pin 11 of
14
Pin
DIN
Plug.
Adjust
VR507
to
read 4.5A on the
ammeter
in
series with
dummy
load.
1)
Refer to
Fig. 3.
2)
Prevent
short circuit
when
pulling
the
PCB
forward.
6.
To
set
+1 2V
tor monitor.
Power
Supply. Test Point
B.
Adjust
VR503
to
read 12.0V ±0.05V.
1)
Refer
to Fig. 3.
2)
Prevent
short circuit
when
pulling
the
PCB
forward.
7.
Centering the Screen. Screen
On.
Observe
Screen. Adjust
DY and
4 Pole Magnets
to
get
12mm ±3mm
Border.
1|
Refer
to
Fig. 3.
8. V.
Size Cont. Screen
On.
Observe
Screen.
Adjust
VR403
to
get
Circle.
1)
Refer
to Fig. 4.
9.
V.
Linearity Adjustment.
Screen
On. Observe
Screen. Adjust
VR404
to
get E-F Equal.
1)
Refer
to Fig.
4.
10.
Cut
Off
Adjustment. Screen
On.
Observe
Screen. Set
VR20M/2
to
max. adjustment
VR405
so
the.
black on the screen
will
not
be
bright.
1)
Refer
to Fig.
5.
11.
Sub
Contrast
adjustment.
Screen
On
Observe Screen.
Set
VR201-2
to
max. and
VR20M
to
min.
Adjust
VR203
so Y-4
is
slightly
bright.
1)
Refer to Fig.
5.
->
P2)VR502
QVR507
^12V
PROTECT
12V
AD
J.
DM.
r>iVR504
'12V ADJ.
VR401
H.HOLD
D
VR503
12VM0N.ADJ
IC503
\ym
DJ.
u
QVR405
CUT OFF
|0|
<D)
aVR404
V.LINE
aVR403
V.SIZE
IC201
I
FB401
]
A
B
v
?N
D
b^
y
O
c
Fig.
4.
Fig. 5.
Fig.
3.
ALIGNMENT
INSTRUCTIONS FOR PC1512
Equipment
required:
Digital
Multimeter;
Dummy
Load;
0.82ohm/30W,
D.B.O.Scope; Diagnostic
Disc/Tool.
Step
FUNCTION
SIGNAL
IN
SIGNAL OUT METHOD REMARKS
Set
RTC
X-103 Connect Odometer
to
Pin 21 IC134.
Set
Odometer
to 0.2sec/Day. Adjust
it
toDo
this
adjustment only
if
the
real
read 0.00 with TC101.
I
timeclock
chil
is
changed.
27