Commodore 1802 User manual

Commodore Deutschland
Kramer
COMMODORE
1802
COLOR MONITOR
Technical Manual
5/87

Materials
for
1802
Manual
o
NISC
aC:
120V
60Hz
0.8A
60¥
o
PAL
AC
:
220V
S0Hz
604
o
Features
(compared
vith
1702)
1)
Additional
Switches
:
Video,
Audio
I
&
II,
Monochrome
2)
40-column
Monitor
:
40
characters
x
25
lines
(8
x
8
dots)
3)
3-mode
Video
Select
Switch:
1.
Composite
---
For
VIR,
TV
tuner,
home
computer,
etc.
2.
Separate
---
For
C64,
C128
and
TED
series
3.
Monochrome
---
For
home
business
computer
(Green
screen
display
to
protect
eyes)
The
figure
below
is
an
example
of
connecting
a
three-jack
cable
to
the
rear
panel.
Monitor's
Rear
Panel
a) sparate Mode:
Commodore
Personal
Computer
b) Composite Mode:
Connect
the
cable
to
VIDEO
and
AUDIO
I,
c) Monochrome Mode:
Connect
the
cable
to
MONOCHROME
and
AUDIO
ITI.
The
jack
end
of
the
cable
can
be
plugged
into
the
CHROM
socket
in
any
mode.
NOTE:
Mode
is
selected
with
the
3-mode
Video
Select
Switch
on
the
front
control
panel.

Q)
POWER
INDICATOR
|
ase
“@
PovER
BUTTON
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NSS
“@
FRONT
CONTROL
PANEL
SSC~sYSC(‘~*S
=
~—
@
voz
=—=——SS*S*S*S*«@:C«é
nad
contro
kno
~—
@
VIMEO
MODE
SWITCH
—~—~*|
_‘S-position
slide
svitch
“Gti
Sm
Mama
ponteel
each
iO
re
eee
em
~
@conmesst.——=—~—~—~S*S*S*«~Y:~S*~*«
anual
control
nob
~
@
seer
=
———~S~S*S*~S*S*«*SS~S*«Ranua
contro
knc
@vVwis
=
—~—~—~—~~—~—~—S«SY~Ss«CManual
control
knob
~~
@
wrest
——~—~—~S~S*~S™S”*WYS«CManad
control
knob
-
(G)
ab,
SSS
CG
Maneal
conteol
knob:
@mern
=
t™~—“—sCSsSC“<i=‘“<s
SS
VIDEO
(YELLOW)
=SS*~*~*~d=CS*~S*«sip
ace
"aUDIO
1
(WHITE)
=—SSS*~*~*~«~wS*~CS*~CS«és
Gack
UNA
(ELLOW).=SSSS*~*~*~*dS*SCS*«<CS~Ssip
Sak
"CHROMA
(RED)
==SSS*~*<“<~*é‘“*!:*S*sp
Sack
SS
"AUDIO
TE
(WHITE),
=——=S*~*~*~S*dYSCS*é*<CS~sip
ake
SS
"MONOCHROME
(VELLOW)=—==S=S*=*d*S*S*«sip
eck
@uuumzSt~—<—S~sSC“‘<‘<‘<C
@
warranty
(woo)
sst—<~iS*ti<CS*é~S
a
@
Ram
useStC<is~—S*S~CS~S
—
@
powrcop
|
=e
NOTES: (@) V-HEIG = VERTICAL HEIGHT
(0) H-POSI = HORIZONTAL POSITION
(1) V-HOLD = VERTICAL HOLD

pecgeenetea
@
VIDEO
MODE
SWITCH
COLOR
MONO
COMP
SEP
eanaua
Co.)
I
«
Iit
@_REAR
PANEL
I
©
.
It
©
LUMA
CHROMA
AUDIO
II
IIl
©
MONO
CHROME
STUN
Wu
WVU
veal
nett. SS
@
FRONT
CONTROL
PANEL
ee
eee

CONTENTS
SPECIFICATIONS
,
oan
1
IMPORTANT
SERVICE
SAFETY
INFORMATION
2
INSTALLATION
AND
CHASSIS
PARTS
LOCATION
3
SERVICE
INSTRUCTIONS
5
SERVICE
ADJUSTMENT
12
SERVICE
INFORMATION
19
Rear
Connection
Panel
19
PC.B
Board
Layouts
19
Circuit
Diagram
23
Block
Diagram
24
Parts
List
25
SPECIFICATIONS
SSS
Ae
SS
a
a
a
Ee
CRT:
13V
inch
90’
in-line,
Vertical
Stripe
Video
band
width:
Composite;
3.5MHz
Phosphor
0.62mm
pitch,
gray
face.
Seprated
video
(luma
&
Chroma);
input
Signals:
PAL
Composite,
Separated
4.2
MHz
Mono
video,
4.2
MHz
video
(luma
&
chroma),
Scanning
frequency:
Horizontal;
15.625
KHz
Monochrome
video,
Audio
|,
Vertical;
50 Hz
Audio
II.
Audio:
Input;
1Vpp/47K
Input level
Comp.,
Video,
Output;
1W
OMA;
Mono;
WWp.p/75_
Sd
Dimensions:
356(W)
x
380(D)
x
391(H)
mm
Display
size:
247(H)
xX
160(V)
mm
Weight:
Approx.
12
Kg
Colors:
Comp.; Full
colors
Power
input:
220 VAC,
50
Hz
Resolution:
Comp.;
1,000
characters
Power consumption:
65W
(40
column
x25
lines)
plat
ad
Stele
hl
lc
a
a,
*Design,
features
and
specifications
are
subject
to
change
without
notice.

IMPORTANT SERVICE SAFETY INFORMATION
WARNING:
An isolation transformer must be used between the AC supply and the AC plug of the color monitor before servicing or testing
is performed on this monitor, since part of the chassis and the heat-sink are directly connected to one side of the AC line which
could present a shock hazard. The chassis of the monitor should never be connected ground.
Before servicing is performed, read all the precautions labelled on the CRT, chassis, and on the inside of the cabinet of this monitor.
X-RAY RADIATION WARNING NOTICE
WARNING: PARTS WHICH INFLUENCE X-RAY RADIATION IN HORIZONTAL DEFLECTION. HIGH VOLTAGE CIRCUITS
AND PICTURE TUBE, ETC., ARE INDICATED BY (x) IN THE PARTS LIST FOR REPLACEMENT PURPOSES. USE ONLY
THE TYPE SHOWN IN THE PARTS LIST.
PRODUCT SAFETY NOTICE
WARNING: FOR CONTINUED SAFETY, REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER
RECOMMENDED PARTS. THESE PARTS ARE IDENTIFIED BY SHADING AND BY (A\) ON THE SCEMATIC DIAGRAM.
RRR
NOTICE D’AVERTISSEMENT DE RADIATION AUX RAYONS X
AVERTISSEMENT: LES PIECES QUI INFLUENCENT LES RAYONS X AU COURS DE LA DEVIATION HORIZONTALE, LES |
CIRCUITS A HAUTE TENSION ET LE TUBE-IMAGE, ETC. SONT ACCOMPAGNEES D’UN ASTERIQUE( *) DANS LE
CATALOGUE DE PIECES DETACHEES. DANS LE CAS D’UN REMPLACEMENT, UTILISER UNIQUEMENT LES MODELES
DE PIECES INDIQUES DANS LE CATALOGUE DE PIECES DETACHEES.
NOTICE DE SECURITE
AVERTISSEMENT: POUR ETRE ASSURE D'UNE SEOURI OPTIMENT A TOUT MOMENT, REMPLACER LES COM-
POSANTS CRITIQUES UNIQUEMENT PAR LES PIECES RECOMMANDEES PAR LE FABRICANT DE LAPPAREIL, CES
PIECES SONT IDENTIFIEES PAR UNE ZONE D'OMBRE FT PAR LE SYMBOLE (4\) SUR LE SCHEMA DE MONTAGE.
The manufacturer's warranty and liabilities will be void if any unauthorized modifications, alterations or additions are made.
For replacement purposes, use the same type or specified type of wire and cable, ensuring that the positioning of the wires
is followed (especially for HV. and power supply circuits). Use of alternative wiring or positioning could result in damage to the
set or in a shock or fire hazard.
The picture tube used in this monitor employs integral implosion protection and should be replaced with the tube of the same
type number for continued safety.
When handling the CRT, shatter-proof goggles must be worn after completely discharging the high voltage circuit.
Do not lift the picture tube by the neck.
eee PRECAUTION
. Potentials as high as 24,000 volt!s are present when the monitor is operating. Operation of the monitor ourside the cabinet
or with the back board removed involes a shock hazard from the monitor.
2. Servicing should not be attempted by anyone who is not thoroughly famillar with the precautions necessary when working
on high-voltage equipment.
. Always discharge the picture tube to the monitor chassis to keep off the shock hazard before removing the anode cap.
. Perfectly discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated and
if broken, glass fragments will be violently expelled.
. lf any FUSE in this monitor is blown, replace it with FUSE specified in the chassis parts list.
. When replacing a high wattage resistor (oxide metal film resistor) in circuit board, keep the resistor 10mm away from circuit board.
. Keep wires away from high voltage or high temperature components.
. This monitor must operate under AC220 volts, 50Hz, NEVER connect to DC supply or any other power or frequency.
ho
OND MO

INSTALLATION
AND
CHASSIS
PARTS
LOCATION
INSTALLATION OF THIS COLOR MONITOR CHASSIS AND INITIAL CHECK POINTS
When
installing
this
color
monitor
chassis,
first
check
operation
on
a
black
and
white
telecast.
Check
and
if
necessary,
adjust
centering,
size,
and
focus.
Observe
the
picture
for
proper
black
and
white
reproduction
(tracking)
over
all
areas
of
the
screen.
No
objectionable
color
shading
or
fringing
should
be
evident.
If
shading
or
fringing
is
evident,
degauss
the
monitor.
In most instances after installation, a technician need only degauss the faceplate area and touch-up the static (center) con-
vergence.
CHASSIS PARTS LOCATION
The
degaussing
coil
should
be
moved
slowly
around
the
front
faceplate
of
the
picture
tube
and
around
the
sides
and
front
of
the
monitor.
The
coil
should
then be
withdrawn
slowly
to
a
distance
of
at
least
six
to
ten
feet
before
disconnecting
from
the
AC
supply.
This monitor chassis is equipped with an automatic degaussing circuit which effectively demagnetizes the faceplate each
time the monitor is switched ON after having been OFF for at least ten minutes.
Note:
See ‘SERVICE ADJUSTMENT’ on page 12 for details of adjusting procedures.
Focus ADJ.
Screen ADJ.
SIGNAL INPUT
PANEL
CONTRAST
BRIGHT
N
4
2nd
ANODE
CAP
COLOR
MODE SELECT SW.
VOUUME CRT SOCKET
AC POWER CORD
Fig. 1

sw701 Color Bright Contrast
1601 R509 R233 R220
Input signal DELAY LINE R997
DM . DLS501 Sub Bright
ces) CHROHA
AMPLITUDE
R507 R409
:
H.
HOLD
.
[5]
t02
a
4PC
Adj
[0]
|
1301
——
EM R309
R522
ess) COLOR SYNC Q402
R418 C417
C426
R411
Pin
) V-CENTER creer
“R359
___| TSW-4204
01 T801 L» Focus Adj
Screen Adj
Nonisolation
Isolation
Ree
(CM-146 MAIN BOARD)
R565 R BIAS
R572 G BIAS
R578 B BIAS
R446 R DRIVE
R580 B DRIVE
NECK BOARD

SERVICE INSTRUCTIONS
a
hon
_
CHASSIS REMOVAL (SEE FIGS. 3/4)
. Remove the five screws securing the rear cover of the
cabinet. (See Fig. 3)
. Pull the rear cabinet about 10cm to the rear.
. Remove the rear cabinet.
. Remove solder connection of the black wire connecting CRT
grounding and neck pc board, then remove the neck p.c
board from the picture tube. (See Fig. 5)
. Remove the second anode cap.
Remove five Screws
Fig. 3
MAIN CHASSIS SERVICING
Remove the rear cabinet.
. Repairing of main chassis can be done easily, if stood as
shown in Fig. 6.
O ON
. Remove the connectors as follows:
1) Deflection yoke connector
2) Degaussing coil connector
3) Speaker connector
. Remove the two screws securing the power switch.
. Take the chassis out of the cabinet.
. To install the chassis, repeat the above procedure in reverse
order.
Remove Second Anode Cap
Remove Solder Connection of
Black Wire from CRT Ground
Fig. 5

PICTURE
TUBE
REMOVAL
gash
In order to remove or replace the picture tube, the chassis
must first be removed. Refer to Chassis Removal procedure.
After the chassis has been removed, proceed as follows.
1. Loosen the clamping screws on the deflection yoke, purity
and static convergence magnet, and remove them.
2. Remove four screws securing the picture tube to the front
cabinet.
PRECAUTIONS FOR REPAIRS
1. Check for bad contacts on connectors on the main PC board
and elsewhere by applying hand pressure.
2. Check AC power supply for problems-e.g. blown fuse, bad
switch or AC outlet.
3. Check for intermittents or defective soldering on the main
board by striking the reverse side of the board gently with
an insulated bar.
4. When soldering PC boards, limit the soldering iron
temperature to 500°F (200°C) to avoid peeling of the foil.
5. When soldering transistors or other semiconductors, use
tweezers or a heat sink clip as shown in Fig. 8 to prevent Soldering iron
heat
damage.
Shr
(20
thru
40W)