Bally MIDWAY PAC-MAN 932 User manual

GAME NOS. 932, 933 & 934
MID WAY’S DECEMBER, 1980
PARTS AND
PERATING MANUAL
pgerrneenee™
COCKTAIL #933
UP-RIGHT #932
MINI #934
MIDWAY MFG. Co.
10750
WEST
GRAND
AVENUE
FRANKLIN PARK, ILLINOIS 60131
U.S.A.
PHONE: [phone]
CABLE
ADDRESS:
MIDCO
—
TELEX
NO.:
72-1596

TABLE
OF
CONTENTS
Page No.
GENERAL
INSTRUCTIONS
-
UP-RIGHT
&
MINI
1
GENERAL
INSTRUCTIONS
-
COCKTAIL
2—3
MONITOR
ADJUSTMENTS
-
ELECTROHOME
4—6
MONITOR
ADJUSTMENTS
-
WELLS-GARDNER
7—8
SWITCH
ADJUSTMENTS
9
NO.
0932
-
PAC-MAN
UP-RIGHT
-
PHOTOGRAPH
10—11
INTERIOR
ACCESS
PICTURE
-
UP-RIGHT
12—13
NO.
0934
-
PAC-MAN
MINI
-
PHOTOGRAPH
14—15
INTERIOR
ACCESS
PICTURE
-
MINI
16—17
CONTROL
ASSEMBLY
-
ALL
GAME
VERSIONS
18—19
PUSH
BUTTON
ASSEMBLY
-
UP-RIGHT
&
MINI
20—21
DOUBLE
ENTRY
COIN
DOOR
ASSEMBLY
22—23
NO.
0933
-
PAC-MAN
COCKTAIL
-
PHOTOGRAPH
24—26
COCKTAIL
ADDITIONAL
PARTS
LIST
27
SINGLE
ENTRY
COIN
DOOR
ASSEMBLY
28—29
TRANSFORMER
BOARD
ASSEMBLY
30—31
GAME
BOARD
SCHEMATIC
32
GAME
BOARD
COMPONENT
LAYOUT
‘‘A’’
VERSION
33
GAME
BOARD
COMPONENT
LAYOUT
‘‘B’’
VERSION
34
GAME
LOGIC
CHIP
NUMBER
&
FUNCTION
35
Z-80
SYNC
BUSS
CONTROLLER
SCHEMATIC
36
Z-80
SYNC
BUSS
CONTROLLER
COMPONENT
LAYOUT
37
V-RAM
ADDRESSER
SCHEMATIC
38
V-RAM
ADDRESSER
COMPONENT
LAYOUT
39
CREDIT
MULTIPLIER
SCHEMATIC
40
CREDIT
MULTIPLIER
COMPONENT
LAYOUT
41
WIRING
DIAGRAM
-
UP-RIGHT
‘‘A’’
VERSION
42
WIRING
DIAGRAM
-
UP-RIGHT
‘‘B’’
VERSION
43
WIRING
DIAGRAM
-
MINI
‘‘A’’
VERSION
44
WIRING
DIAGRAM
-
MINI
‘‘B’’?
VERSION
45
WIRING
DIAGRAM
-
COCKTAIL
46
19’
MONITOR
SCHEMATIC
-
WELLS-GARDNER
47
REPLACEMENT
PARTS
LIST
48—49
19’
MONITOR
SCHEMATIC
-
ELECTROHOME
50
REPLACEMENT
PARTS
LIST
51—54
13’
MONITOR
SCHEMATIC
-
ELECTROHOME
55
REPLACEMENT
PARTS
LIST
56—59
MODIFICATION
OF
PAC-MAN
GAME
P.C.B.
60
WARNING
THIS
GAME
MUST
BE
GROUNDED.
FAILURE
TO
DO
SO
MAY
RESULT
IN
DESTRUCTION
TO
ELECTRONIC
COMPONENTS.
COPYRIGHT 1980 ©BY MIDWAY MFG. CO. ALL RIGHTS RESERVED.
NO
PART
OF
THIS
PUBLICATION
MAY
BE
REPRODUCED
BY
ANY
MECHANICAL,
PHOTOGRAPHIC,
OR
ELECTRONIC
PROCESS,
OR
IN
THE
FORM
OF
A
PHONOGRAPHIC
RECORDING,
NOR
MAY
IT
BE
TRANSMITTED,
OR
OTHERWISE
COPIED
FOR
PUBLIC
OR
PRIVATE
USE,
WITHOUT
PERMISSION
FROM
THE
PUBLISHER.
FOR
PERMISSION
REQUESTS,
WRITE:
MIDWAY
MFG.
CO.,
10750
W.
GRAND
AVE.,
FRANKLIN
PARK,
!L
60131

GENERAL INSTRUCTIONS FOR ‘‘PAC-MAN”’ UPRIGHT AND MINI
INSTALLATION
1. Remove shipping cleats located on bottom of cabinet.
2. Install four (4) provided leg levelers to bottom of cabinet and level cabinet.
3. The power is controlled by a switch located on top of the cabinet. Additional taps have been
provided on the transformer to compensate for fluctuating line voltage.
LINE VOLTAGE SAFETY SWITCH
A line voltage safety switch has been provided for your protection. It is located on the right rear
side of the cabinet in the back door area. When the back door is removed, it opens the circuit to
the line voltage. To restore power (when servicing), pull switch fully out.
VOLUME CONTROL
The volume control pot is located on the Game Logic Board (P.C. A082-91352-A000). This pot
controls the volume of all sounds and may be varied as desired by rotating pot control.
ADJUSTMENT SWITCHES
Located on Game Logic Board (P.C. A082-91352-A000) and may be adjusted as indicated on
separate instruction card in back box area.
GAME LOGIC
P.C. AO82-91352—-A 000
ADJ. SW.
VOLUME halls
TO REMOVE CONTROL PANEL AND MONITOR DISPLAY GLASS
. Open coin door.
. Release two (2) clamps located below Control Panel on each side of cabinet.
Disconnect control panel jack.
Remove control panel.
Remove monitor display glass.
CREDIT PUSH BUTTON SWITCH
Located
in
cash
box
area
and
is
readily
accessible
by
opening
coin
door.
This
switch
is
provided
as a test aid and awards one credit without advancing coin meter.
QRwONo
M051-00932-A003
WARNING:
This
equipment
Generates,
Uses
and
can
Radiate
Radio
Frequency
Energy
and
if
not
installed
and
used
in
accordance
with
the
Instructions
Manual,
may
cause
interference
to
Radio
Communications.
As
temporarily
permitted
by
Regulation
it
has
not
been
tested
for
compliance
to
Subpart
J
or
Part
15
of
FCC
Rules,
which
are
designed
to
provide
reasonable
protection
against
such
interference.
Operation
of
this
equipment
in
a
Residential
Area
is
likely
to
cause
interference
in
which
case
the
user
at
his
own
expense
will
be
required
to
take
whatever
measures
may
be
required
to
correct
the interference.
PAGE 1

GENERAL INSTRUCTIONS FOR ‘‘PAC-MAN’”’ COCKTAIL TABLE
INSTALLATION
1. Remove shipping cleats located on bottom of cabinet.
2. Install four (4) provided leg levelers on bottom of cabinet and level cabinet.
3.
The
power
is
controlled
by
a
switch
located
on
the
bottom
of
the
cabinet.
Additional
taps have been
provided
on the
transformer
to
compensate
for
fluctuating
line
voltage.
LINE VOLTAGE SAFETY SWITCH
A
line
voltage
safety
switch
has
been
provided
for
your
protection.
It
is
located
in
the
cabinet
on
the
left
side
of
the
coin
door.
When
the
coin
door
is
opened
the
circuit
to
the
line
voltage
is
interrupted.
To
restore
power
(when servicing),
pull switch
fully
out.
VOLUME CONTROL
The volume control pot is located on the Game Logic Board (P.C. A082-91352-A/B000).
The pot controls the volume of all sounds and may be varied as desired by rotating pot
control.
ADJUSTMENT SWITCHES
Located on Game Logic Board (P.C. A082-91352-A/B000) and may be adjusted as
indicated on separate instruction card in back door area.
GAME LOGIC
P.C. AO082-91352-A/B000
ADJ. SW.
VOLUME Be ae
CREDIT PUSH BUTTON SWITCH
Located to right of cash box and is readily accessible by opening coin door. This switch is
provided as a test aid and awards one credit without advancing coin meter.
TEST SLIDE
Located to right of cash box and is readily accessible by opening coin door. When placed
in ‘‘ON’’ position, this switch indicates test mode.
M051-00933-A003
PAGE 2

GAME BOARD TEST
Place test slide switch in ‘‘ON’’ position. If game board is good, the following
information will be displayed on the screen:
OK
Coin Adjustment Setting
Bonus Adjustment Setting
Number of PAC-MAN Per Game Setting
Game Version
RAM/ROM TEST
If any of the Rams or Roms are faulty, the following information will be displayed on the
screen:
BAD ROM LOCATION CODE BAD RAM LOCATION CODE
Display Location Display Location
M-Rom-0 6E Bad V Ram-0 4K
M-Rom-1 6F Bad V Ram-1 4N
M-Rom-2 6H Bad C Ram-0 4L
M-Rom-3 6J Bad C Ram-1 4P
Bad W Ram-0 4M
Bad W Ram-1 4R
CONTROL PANEL AND COIN SWITCH TEST
To verify operation of any switch, close switch in question. If switch is operating
properly, a game sound will emit when closure is made.
Caution: Be sure to return test switch to game mode when all tests are completed.
TO SERVICE MONITOR, GAME BOARD AND TRANSFORMER ASSY.
1. Open coin box door and release two (2) clamps indicated on sketch below.
2. Grasp monitor mounting panel at ‘‘A’’ and open as indicated in sketch below.
Caution: Due to the weight of the monitor extreme care must be exercised when opening
cabinet for service.

MONITOR - GENERAL INSTRUCTIONS
Service Set-Up Procedure
NOTE: All monitors are equipped with automatic degaus-
sing coils which effectively demagnetize the picture tube
each time the monitor is turned on. The degaussing coils will
operate any time the set is turned on after having been off for
at least five minutes.
The degaussing effect is confined to the picture tube since
the coils are mounted on the ferrous tube shield. Should any
part of the chassis or cabinet become magnetized, it will be
necessary to degauss the affected area by means of a manual
degaussing coil. Move the coil slowly around the CRT face
area, then slowly withdraw for a distance of six feet before
disconnecting the coil from the AC power supply.
Normally little, if any adjustment should be necessary.
However, when a picture tube, yoke or similar component is
repiaced, preliminary static convergence should be done
before attempting purity adjustment, and so on.
Set up should be done in a north/south direction. Horizontal
and vertical centering taps should be set to the centre
position if a major component has been changed.
1.0 Purity
1.1. Loosen yoke retaining clamp (figure 2), remove
adhesive material fixing wedges to CRT. Remove
wedges completely and clean off dried adhesive from
picture tube and wedges.
1.2 Asmall quantity of “nail polish” has been used to lock
the purity convergence rings in place. This seal must
be broken with a sharp tipped instrument before any
adjustments are attempted. Some models also use a
locking ring at either end of the purity and
convergence rings. This must be loosened before
adjustments are made. It goes without saying that
upon completion of all adjustments, the lock must be
reset and/or a dab of paint or naii polish must be re-
applied to edge of rings to prevent movement.
1.3. Connect an appropriate signal source, eg: Electro-
home RGB generator producting a white field plus
individual red, green and blue fields.
1.4 Bring the long and short purity tab protrusions in line
with each other to obtain near-zero magnetic field
(figure 4) (In some cases bring the flat and indented
tabs together to obtain zero field). Protrusions can
then be vertical, horizontal or at any convenient angle
to start.
1.5 Turn off the green and blue fields and adjust setup
controls to produce a red field. (See fig. 3)
1.6 Pull the deflection yoke back so that a red band
appears in the centre of the screen.
1.7. Spread the tabs apart as little as necessary and rotate
both rings together to center the red band horizontally
on the face of the CRT (approximate). (See Fig. 5)
1.8 Slide the yoke towards the bell of the picture tube
slowly to obtain a uniform red field (pure in color)
across the entire tube face. Juggle back and forth
slightly as necessary. Lightly tighten yoke retaining
clamp.
1.9 Momentarily switch on across-hatch signal and rotate
yoke to level the pattern on the face of CRT.
1.10 Return generator to regain red raster.
1.11 Turn off red field and check for pure field for each of
the green and blue fields. Reposition yoke if necessary
to obtain optimum purity on ali fields.
1.12 Tighten yoke retaining clamp to prevent yoke shift or
rotation. (Do not install wedges at this time.)
PAGE 4
YORE CLAMP SCREW
/ fon PURITY MAGNETS
4-POLE CONVESGENCE MAGNETS
REAR 6-POLE CONVERGENCE t4AGNETS
LOCKING RING ON 26 INCH MODELS
fax: RING ON SOME MODELS
Figure 2
CRT SOCKET P.C.B.
SCREEN VR af)
(TB | eve cutorr ver
GREEN oRive | J} (9 | screen cutorr ve
REO ORIVE a Tf } Reo cutorr va
BE CAREFUL OF ‘“B’ AND ‘B BOOST VOLTAGES PRESENT ON P.C.B-
Figure 3
(REAR VIEW]
Long and short Short and long
protrusions protrusions
Let the protrusions come in line.
Figure 4
Centre
Bring the green bend to the centre. Figure 5

2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
3.0
3.1
3.2
3.3
3.4
3.5
Static and Dynamic Convergence
NOTE: Static convergence is achieved by four
magnets located on the neck, nearest the base of the
picture tube, Fig. 2. The middle pair of magnetic rings
are adjusted to converge the blue and red crosshatch
lines. The.rear pair of convergence rings (closest to
the base of the picture tube) are adjusted to converge
the magenta (blue/red) to the green crosshatch lines.
Dynamic convergence is achieved by tilting the
deflection yoke up-down and left-right.
Ensure that the controls misadjusted during purity
setup (screen, cut-off, etc.) are set to give white
balance. See 3.0 below.
Switch generator to the crosshatch pattern.
Adjust convergence around the edges of the picture
tube by tilting the yoke up-down and left-right, and
temporarily install one wedge at the top of the yoke or
in a more optimum position. (Figures 8, 9, 10)
Turn off green input and turn on the red and blue
input.
Rotate the 4-pole (middle) pair of magnets as a unit to
minimize separation of the red and blue crosshatch
lines around the center of the screen (Figure 6). Varia-
tion of the angle between the tabs adjusts convergence
of red and blue. (Tilt yoke as required to converge red
and blue at the edges as in 2.3 above.)
Turn on green input to obtain magenta (red/blue) and
green crosshatch lines. Rotate the 6-pole (rear) pair of
magnets as a unit to minimize separation of the
magenta and green lines (figure 7). Vary angle
between the two tabs and further rotate as a unit to
finalize.
When converence of 3 colors is optimized (static in
center and dynamic around edges) apply stripe of
paint or nail polish to converence magnet rings to
prevent movement. If applicable, tighten locking ring
carefully.
Remove temporary wedge from yoke. Tilt yoke in up-
down and left-right direction for best circumference
convergence and install 3 wedges. (It is best to use 3
new wedges since they have adhesive backing. Simply
pull off tape, slide wedge in place and press outer flap
down firmly. For more permanency apply small
quantity of silastic or similar material at junction of
wedges and picture tube. Do not disturb while material
is setting. (Order wedges by part number 39-1233-01).
White Balance (Grey Scale Tracking)
Refer to figure 3. Do the following in subdued light:
Note this adjustment can be accomplished with no
signal connected; eg: input connector open or if a
signal generator is connected, switch off all 3 inputs at
the generator.
Set red and green drive controls to their mechanical
center and turn the common G2 screen contro! and 3
cut-off controls to minimum (fully counterclockwise).
Slowly turn up G2 screen control until the first faint
color appears, then back off to edge of visibility. Do
not touch the associated cut-off control - it should stay
fully CCW for the remaining set-up.
Slowly turn up the other two color cut-off controls in
turn to match the first. This should result in the faintest
grey.
Turn on the signal generator with all 3 inputs on. (a
crosshatch pattern would be appropriate).
[FRONT VIEW]
Let the red and biue lines come in line by
turning two 4-pole magnets.
{FRONT VIEW]
Green
Around
centre
Let the green and magents lines come in line
by turning two 6-pole magnets.
[REAR VIEW]
Cy
AWS
Roughly adjust the circumferential con-
vergence and install one wedge temporarily.
[FRONT VIEW]
Red Green Blue
Tilting the yoke upward will move the lines
as shown with the arrows.
[FRONT VIEW]
Green Bive
iI
atl.
Tilting the yoke to the right will move the
lines as shown with the arrows.
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
PAGE 5

3.6
Adjust
the
red
and
green
drive
controls
for
“neutral
white”
on
high
white
picture
areas.
Generally
these
controls
will
be
left
at
mech.
centre.
3.7
Note:
When
monitor
is
re-connected
with
the
game
the
screen
control
(G2)
may
require
a_
slight
adjustment
to
obtain
proper
black
level.
(the
black
portion
of
picture
just
extinguished).
{REAR VIEW]
Anode cap
Figure 11
4.0 Power Supply
The
regulated
+B1
control
(R909)
has
been
factory
adjusted
and
normally
requires
no
adjustment.
However,
if
any
repairs
have
been
made
to
the
chassis
it
is
recommended
that
this
adjustment
should
be
made.
a)
Allow
5
minutes
to
warm
up.
b)
No
signal
applied.
c)
Connect
an
accurate
D.C.
voltmeter
to
TP-91
or
the
emitter
of
X04
power
regulator
transistor.
d) Adjust R909 for 120V. (See fig. 1)
Note:
Should +B1 control be set too high, it may cause
possible component damage. Use an accurate
D.C. voltmeter to set B1 (Bt).
5.0 Focus
Adjust focus control for best overall definition and
picture detail an average signal applied. (Highlights
should be favoured.)
6.0 Color Service Generator for G07 Monitor
Electrohome has developed a color service generator that is
specifically designed for use with the GO7 color data
monitor. It provides the monitor with both horizontal and
vertical sync, as well as the following test patterns:
1) Fine cross-hatch pattern
2) Broad bar cross-hatch pattern
3) Complete field
Three color selection switches, red, green and biue, provide
the
ability
to
display
the
above
patterns
in
the
three
primary
colors as well as the three secondary colors.
This product may be ordered from:
Contracts Marketing
ELECTROHOME Electronics
809 Wellington St. North
Kitchener, Ontario
Canada N2G 4J6
Telephone: [phone], Ext. 567
PAGE6
7.0
7.1
tg’
ts
8.0
8.1
8.2
X-Ray Emission Check
Assure the power supply B1 is properly adjusted to
120V DC. See Item 4.0 (page 8)
Assure that the anode voltage does not exceed max.
as per Item 2.0 page 4.
Assure that the high voltage hold down circuit is
operating correctly. Use the following procedure.
a) Increase the B1 greater than 138.5V by shorting
collector/emitter of the power regulator, X04.
b) Observe that the anode voltage (EHT) goes to 0. If
the EHT does not go to 0, a fault must be located
and repaired.
c) Remove short and set should return to normal
operation. (Note, after the short is removed some
monitors may not restart. In this case, remove
power from monitor momentarily and normal
operation will be restored.
Note:
The protector circuit consists of the components
shown below in Fig. 13 with a circuit description.
Bi
lee X Fal
$39 Kohm p 701 2ZSC454C
+,-1% = gy20Ev2 a
-- fq 7
R 704
7.68 Kohm
+,-12
C70) R701
300/16 4.7 Kohm
Figure 13
Circuit Diagram and Description of High Voltage Hold
Down or Safety Circuit
Circuit Diagram of High Voltage Hold Down Circuit.
Operation of High Voltage Hold Down Circuit.
The high voltage hold-down circuit protects the high
voltage circuit from dangerous voltage with short
circuiting between emitter and collector of power
regulating transistor.
The base voltage of X701 is increased when the B1
voltage is increased more than 138.5 V DC.
When the base of X701 is increased, a short is
produced by X701 between pin 11 and ground of IC
501, shutting down the horizontal osc. and high
voltage.

INSTALLATION AND SERVICE INSTRUCTIONS
COLOR PURITY AND VERTICAL
CENTERING ADJUSTMENT
For best results, it is recommended that the purity adjust-
ment be made in the final monitor location. If the monitor
will be moved, perform this adjustment with it facing
west or east. The monitor must have been operating 15
minutes prior to this procedure and the faceplate of the
CRT must be at room temperature.
The monitor is equipped with an automatic degaussing
circuit. However, if the CRT shadow mask has become
excessively magnetized, it may be necessary to degauss
it with manual coil. Do not switch the coil OFF while the
raster shows any effect from the coil.
Purity Magnets are used for Color Purity and V Centering
Adjustment.
Purity Adjustment procedure is as follows.
1. Remove R-G-B signal from monitor.
2. Turn Green Cut off Control (VR404) on the Neck
Board fully CCW.
Turn Red and Blue Cut off Control (VR405) fully CW.
3. Pull the Deflection Yoke backward so that the
Magenta belt will appear. (See Fig. 4)
4. Move the two Purity Magnets and bring the Magenta
belt to the mechanical center of the screen (See Fig.
5) The vertical center position should be set VRS to
—5/64” (—2 mm) as shown in Fig. 6.
Insert service tip “N” on Neck circuit board to “S” on
Vert./Horiz. circuit board (See Fig. 13). To check, use
the Green raster at low intensity. Be sure to return
the service tips to their original positions for the next
check.
5. Push the Deflection Yoke forward gradually and fix it
at the place where the Magenta screen becomes
uniform throughout.
6. Turn Cut off Control, and Drive Control and confirm
that each color is uniform.
7. tf the color is not uniform, re-adjust it moving Purity
Magnets slightly.
8. Move a pair of Purity Magnets at the same time (do
not change the angle of the pair), and adjust the vert.
center to center of screen.
9. Obtain the three colors and confirm whether white
uniformity is balanced.
10. Insert the temporary wedge as shown in Fig. 5 and
adjust the angle of Deflection Yoke.
STATIC CONVERGENCE ADJUSTMENT
A
recently
developed
Deflection
Yoke
and
Electron
Guns
construction
has
been
used
on
this
equipment
in
com-
bination
with
In-Line
Guns
and
Black
Stripe
Screen
to
make
a
barrel-type
magnetic-field
distribution
for
vertical
deflection
and
a
pin-cushion-type
magnetic
field
for
horizontal
deflection
with
which
a_
self-converging
system
can
be
obtained.
This
type
is
different
from
con-
ventional
unity-magnetic
field
distribution
type
deflec-
tion
yoke.
4-Pole
Magnets
and
6-Pole
Magnets
are
employed for static convergence instead of a Con-
vergence Yoke.
1. A cross hatch signal should be connected to the
monitor.
2. A pair of 4-Pole Convergence Magnets are provided
and adjusted to converge the blue and red beams.
When the Pole opens to the left and right 45° sym-
metrically, the magnetic field maximizes. Red and
blue beams move to the left and right oppositely (See
Fig. 7-a and 7-b). Variation of the angle between the
tabs adjusts the convergence of red and blue vertical
lines.
When the both 4-Pole Convergence Magnet Tabs are
rotated as a pair, the convergence of the red and blue
horizontal lines is adjusted.
3. A pair of 6-Pole Convergence Magnets are also pro-
vided and adjusted to converge the magenta (red +
blue) to green beams.
When the Pole opens to the left and right 30° sym-
metrically, the magnetic field is maximized. Red and
blue beams both move to the left and right (See Fig.
8-c and 8-d).
Variation of the opening angle adjusts the con-
vergence of magenta to green vertical lines. When
both 6-Pole Convergence Magnet Tabs are rotated as
a pair the convergence of magenta to green horizon-
tal lines is adjusted.
PRECISE ADJUSTMENT OF DYNAMIC
CONVERGENCE (See Fig. 10 and 11)
1. Feed a cross hatch signal to the monitor.
2. Insert the temporary wedge and fix Deflection Yoke
so as to obtain the best circumference convergence
(See Fig. 10 and 11).
NOTE:
The temporary wedges may need to be moved during
adjustments.
4. Insert three rubber wedges to the position as shown
in Fig. 9 to obtain the best circumference con-
vergence.
NOTE:
1) Tilting the angle of the yoke up and down adjusts the
crossover of both vertical and horizontal red and blue
lines. See Fig. 10 (a) and (b).
2) Tilting the angle of the yoke sideways adjusts the
parallel convergence of both horizontal and vertical
lines at the edges of the screen. See Fig. 11-a and b.
3) Use three rubber wedges (thick and thin rubber
wedges are used for a purpose).
4) The angle of each rubber wedges are shown in Fig. 9.
5) After three rubber wedges have been inserted, pull
out the temporary wedge.
6) Fix the rubber wedges with chloroprene rubber
adhesive.
PAGE 7

INSTALLATION
AND
SERVICE
INSTRUCTIONS
BLACK
AND
WHITE
TRACKING
(With
R/G.B.
inputs
grounded)
1.
2.
3.
Green Beam
Mechanical
Center ei
<= vRS
ae :
Set
Black
Level
Control
(VR201)
to
mid
point.
Set
Red
and
Blue
Drive
Controls
(VR401
&
VR402)
to
their
mechanical
center.
Set the
G2
Screen
Control
(VR406)
and
the
3
Cut-off
Controls
(VR403,
VR404,
&
VR405)
to
minimum
Magenta
Belt
FIGURE 4
Temporary Wedge
Le
fo
FIGURE 6
Upper
BGR \
R 8
CRT
G G —_
8 R
RGB Under
insert Rubber Wedge
CRT Screen (a) from Upper Side
Upper
RGB
8 R CRT |}
G G
R 8 4
BGR Under
CRT
Screen
{b)
Insert
Rubber
Wedge
from Lower Side
FIGURE 10
PAGE 8
4-Pole Magnets and the Movement of Beams
FIGURE 7
flection Yoke
(CCW).
Slowly turn up G2 screen control until the first faint
color appears.
Slowly turn up the other two color cut-off controls in
turn to match the first.
Remove ground from R/G/B/ inputs. Adjust Red and
Blue Drive Controls (VR401 & VR402) for white
screen.
6-Pole Magnets and the Movement of Beams
FIGURE 9
FIGURE 8
Temporary Wedge
Rubber
Wedge
\ CRT
oY
GIR}
Insert Rubber Wedge
CRT Screen (a) from Left Side
CRT
oY
iets}
Insert Rubber Wedge
CRT Screen (b) from Lower Side
FIGURE 11