Commodore Computers 1901 User manual

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COMPUTERS
COMMODORE
Video — Monitor
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TABLE OF CONTENTS
Specification
Safety Precaution
Chassis Layout
Alignment Procedure
Block Diagram
Technical Description
Input Processing
Schematic Diagram
Trouble Shooting
Main PC Board Layout (Component Registration)
Main PC Board Layout (Copper Track)
PAL/RGBI Module Copper Track and
PAL/RGBI (Component Registration)
Special Parts
PAGE
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SPECIFICATIONS
Type
Colour
Power requirements
Power consumption
Screen size
Audio output
Speaker
External input terminals
Video input
Input type
Input level
Input impedance
Connector type
Commodore video input
1) Luminance signal input
Input type
Input level
Input impedance
Connector type
2) Chrominance signal input
Input type
Input level
Input impedance
Connector type
R-G-B input
Input type
Input level
Input impedance
Audio input
Input level
Input impedance
Connector type
Dimensions
Weight
Color video monitor
PAL/RGB |
AC 220 — 240 V, 50 Hz
60W
14” (36 cm)
90° deflection angle
1W
10cm x 10cm
Composite video signal (CVBS)
1.0 Vp-p (sync negative 0.3 V)
752
RCA pin jack
Composite video signal (VS)
1.0 Vp-p (sync negative 0.3 V)
75
RCA pin jack
PAL chroma signal
1.0 Vp-p
752
RCA pin jack
D-9
OV/5Vp-p
470 Ohms
1.0 Vp-p
10k-0
RCA pin jack
345 (W) x 360 (H) x 370 (D) mm
Unit weight: 9.5 Kg
Gross weight: 10 Kg
Design and specifications subject to change without notice.

SAFETY PRECAUTION
The design of this product contains special hardware
many circuits and components specially for safety
purposes. For continued protection, no change
should be made to the original design unless autho-
rized in writing by the manufacturer. Replacement
parts must be identical to those used in the original
circuits. Service should be performed by qualified
personne! only.
Alterations of the design or circuitry of receiver
should not be made. Any design alterations or
additions will void the manufacturer’s warranty and
will further relieve the manufacturer of responsi-
bility for personal injury or property damage
resulting therefrom.
Many electrical and mechanical parts in monitor
sets have special safety related characteristics.
These characteristics are often not evident from
visual inspection nor can the protection afforded
by them necessarily be obtained by using replace-.
ment components rated for higher voltage, wattage,
etc. Replacement parts which have these special
safety characteristics are identified in the part list
of Service manual. Electrical components having
such features are identified by shading on the
schematics and by (A) on the parts list in Service
manual. The use of a substitute replacement which
does not have the same safety characteristics as
the recommended replacement part shown-in the
Parts list in Service manual may create shock, fire
or other hazards.
\f any repair has been made to the chassis it is
recommended that the power supply be checked
or adjusted (see ADJUSTMENT OF Ai POWER
SUPPLY).
The high voltage applied to the picture tube must
conform with that specified in Service manual,
Excessive high voltage can cause an increase in
X-ray emission arcing and possible component
damage therefore operation under excessive high
voltage conditions should be kept to a minimum
or should be prevented. tf severe arcing occurs;
remove the AC power immediately and determine
the cause by visual inspection (incorrect installation
cracked or melted high voltage harness, poor
soldering etc). To maintain the proper minimum
level of soft X-ray emission components in the high
voltage circuitry including the picture tube must
be the exact replacements or alternative provided
by the manufacturer of the complete product.
Do not check high voitage by drawing an arc.
Use high voltage meter or a high voltage probe
with a VTVM. Discharge the picture tube before
attempting meter connection, by connecting a clip
lead to the ground frame and connecting the other
end of the lead through a 10K 2 2W resistor to the
anode button. .
When service is required, observe the original lead
dress. Extra precautions should be given to assure
correct lead dress in the high voltage circuit area.
Where a short circuit has occured, those compo-
nents that indicate evidence of overheating should
be replace. Always use the manufacturer’s replace-
ment components.
ISOLATION CHECK
(SAFETY FOR ELECTRICAL SHOCK
HAZARD)
After re-assembling the Product, always perform
an isolation check on the exposed metal parts of
the cabinet (‘D’ — subminiature connectors, video
phono jacks, metal cabinets, screwheads, sound
phono jack, control shafts, etc) to be sure the pro-
duct is safe to operate without danger of electrical
shock,
1) Dielectric Strength Test
The isolation between the AC primary circuit
and a metal parts exposed to the user parti-
cularly any exposed metal part having a return
path to the chassis should withstand a voltage
of 1,100V AC (r.m.s.) for a period of one
second, This method of test requires a test
equipment not generally found in the service
trade,
2) Leakage Current Check
Plug the AC line cord directiy into the AC
outlet (do not use a line isolation transformer
during this check). Using a “Leakage Current
Tester” measure the leakage current from each
exposed metal part of the cabinet particularly
any exposed metal part having return path to
the chasis to a know good earth ground (water
pipe, etc). Any leakage current must not
exceed 0.7mA.

CHASSIS LAYOUT
SCREEN GRID CONTROL
VG2
FOCUS
WHITE
ALIGNMENT
C9) oo Co
HHIII
PVO2
PVO01
PV03
FOR PAL RGBI
MODULE
BAO2 =a ee
BA04
$.01
PV05 PSO1
PLO1 PFO1 PFO2 PV04 PVO7
7
Slide switch Me
See
VERTICAL
VOEUME
HORIZONTAL
PICT.
/
PICT.
AMP
\
convo
ATPAL POSITION SHIFT FOR ae
— ONLY FOR PAL COMPOSITE
HORIZONTAL PICT. SHIFT FOR
COMPOSITE INPUT VIDEO RGBI SIGNAL
AT RGBI POSITION VERTICAL
— ONLY FOR RGBI SYNCHRONIZATION INTENSITY WHEN RGB INTENSITY IS USED
INPUT OR COLOUR SATURATION WHEN PAL
MODULE IS USED

ALIGNMENT PROCEDURE
Setting a) Connect AC power and assure that in within the operating rates.
A)
B)
C)
D)
E)
F)
G)
H)
b)
Connect
a
correctly
adjusted
color
computer
to
the
rear
input
connector
and
set
the
slide
switch
for
the
computer
being
used.
A2 Voltage Adjustment
1) set brightness, contrast, intensity control min.
2)
measure
the
DC
voltage
(A2)
of
cathodes
at
DP10
and
chassis
ground.
3)
adjust
PPO1
to
114
voltage
+
1%
Horizontal Frequency Adjustment
1) Brightness : Background just back
Contrast : 50%
Intensity : Maximum
2) Picture tube must be facing East direction
3)
Set
should
be
carried
out
in
the
same
magnetic
field
as
its
final
destination
(Equatorial
or
Southern
Magnetic
field)
4) Test point os is shorted to ground
5)
Adjusted
PLO2
until
the
Picture
is
close
to
synchronization
or
the
free
running
horizontal
frequency
= 15626
Hz
+
50
Hz.
Vertical Frequency Adjustment
1) Inject a 46 Hz signal intoTP <>
2)
Adjust
PFO1
for
the
black
bar
on
the
raster
to
be
almost
stationary
or
vertical
frequency
=
46
Hz
+
0.2
Hz.
Horizontal
and
Vertical
Shifting
Adjustment.
1) Adjust PLO1 until picture is centralised at PAL composite mode.
2) Adjust PVO7 until picture is centralised at RGB! mode.
Vertical Amplitude
Adjust PF02 such that the 3 reference lines on the top of the screen disappear.
Intensity Control
Adjust
PV04
for
intensity
control
(in
this
Alignment
Procedure
Intensity
Control
must
be
set
to
maximum)
Focus
1) Display a pattern of characters on the screen
2) Adjust focus knob on the flyback transformer ULO2 for the best focus at screen edge on the diagonal axis.
Geometrical Distortion
1) Setup acrosshatch pattern on the screen
2) Pin cushion correction.
Align
PEO1
for
the
extreme
vertical
lines
on
the
right
and
left
side
of
screen.
adjust
>

1)
J)
K)
Screen Cut-Off
1)
2)
3)
measure
DC
voltage
at
collector
of
TV50,
TV60
and
TV70
select
the
stage
with
the
highest
voltage
adjust screen voltage (VG2) to 170 V £2V
White Colour Adjustment
1)
2)
3)
4)
5)
6)
7)
8)
Set up a 40% white raster on the centre of the screen.
For RGBI signal level must be 4.4V to 5V at 390 termination.
Set
PVO1
(green)
and
PV0Q2
(blue)
to
minimum
position
Monitor wavefrom at collector at TV50 (red)
At
intensity
minimum,
adjust
contrast
and
brightness
for
maximum
amplitude
batore
clamping
Adjust
PV03
(red)
to
have
62V
+2V
pp
Monitor
white
color
temperature
with
detector
probe
head
attached
to
the
screen
surface
over
the
white
pattern
Adjust PVO1 (green) and PVO2 (blue) for white color temperature of 7500k.
PAL/RGBI Decode Alignment
At PAL position
1)
2)
3)
4)
5)
6)
7)
8)
Receive the PAL standard colour bar signal
Connect a jumper clip between TP & and TP ®
Set
the
oscilloscope
to
X-Y
range
and
connect
its
X
probe
to
terminal
2
(B-Y)
and
its
Y
probe
to
terminal
3
(R-Y)
Connect a jumper clip between TP2 and TP3, apply bias +4.5 to TP!
Adjust
CC14
slightly
so
that
the
colour
becomes
unlocked
and
the
loops
of
the
displayed
Lissajoas
figure
appear
on
the
scope
Adjust PCO1 for the absence of the loops and adjust LCOS so that each pair of lines merge together.
Adjust
CC14
to
just
regain
floating
colour
synchronization
i.e.
oscillator
frequency
=
4,433619
Mhz
+
30
Hz.
Trim
PCO1
and
LCOS
slightly
such
that
all
the
points
merge
together
and
the
absence
of
venetian
blinds
on
the
screen
pattern
is
necessary.
adjust adjust
——a—) —_—_—_—_—
At RGBI Position
No alignment is necessary

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IL 01
TEA 2017
42
1P01
TOA 4601
SWITCHING
POWER SUPPLY
220-240VAC
BLOCK DIAGRAM | Hvpe 65V

TECHNICAL DESCRIPTION
SWITCH MODE POWER
SUPPLY
The SMPS works from 220 AC to 240 AC at both
50
Hz
and
60
Hz
frequency
with
an
output
power
of
50
watts.
The
output
voltages
available
are
114V
and
24V. The 114V is used for the line output stage whereas
the
24V
is
used
for
the
oscillators,
line
driver
stage
and
video processing stage. The supplies for sound, heater
and video output amplifier are then tap from the out-
put line transformer,
The AC mains voltage is applied to line filter LPO1 via
an on-off switch and a fuse which provides overload
protection, This voltage is then rectified by DPO1 to
DPO4 and partially filtered by CPO4. The resulting
OC voltage then acts as a supply voltage for switching
transistor TPO1 which is controlled by IC TDA 4601.
During start-up time, the IC 4601 is supplied from the
mains through RP12, However, in normal operation,
the voltage will be tap from windings 11/9 of the switch
mode transformer. For low input supply voltage, the
switch on time will be delayed by resistor RP12, hence
a speed up circuit is necessary, This comprised of tran-
sistor TPO2 and its surrounding components.
The variation of output voltage is simulated by the
feedback control winding 1/9. This voltage is rectified
by DPOS and applied to the amplifier input pin 3 of
contro! IC. It will be compared with the reference
voltage of 4V at pin 1 and the error voltage produced
is amplified and converted to pulse width modulation
in the IC. This will in turn drive the switching transistor
TPO1 at pin 7. The amount of base current is deter-
mine by RP11 between pin 7 and pin 8.
The divider RPO8, RPO9, RP19 at pin 5 monitors the
unregulated DC voltage and hence the AC input. If the
input is lower than 80V, the voltage at pin 5 will be
lower than 2 volt and the IC will subsequently go into
standby operation. This is to avoid operation at too low
a supply voltage.
The collector current is simulated by an external RC
combination of CP07, RPO7, RP20 at pin 4. The voltage
is clamped at 2V and the sawtooth rising AC voltage can
vary up to 4V. This is the maximum limit of collector
current which will trigger the IC for safety operation.
The purpose of this is to prevent overloading of collector
current. At pin 2, the zero crossing of the output AC is
monitored for setting the reference of the base drive
pulse of TPO1.
The
secondary
pulses
from
winding
2/6
and
4/6
are
then
rectified
and
filtered
before
supplying
to
the
other
stages
of
the
set.
HORIZONTAL AND
VERTICAL SCAN CIRCUITS
The IC used for this function is 1L01 TEA 2017. 2
supply voltages are required here; the higher 24V for the
frame output drive and the lower 12V derived from the
_ RC filter RP17, CP18 and regulator {LO2 7812 for the
oscillators circuits.
The input to the IC is composite signal via RLO2, CLO2
to pin 7. Provision for grounding the input is by BAOS
(used when aligning the free running oscillator fre-
quencies). The DC level at pin 7 is clamped by RLO3
and RLO4. Internally, the sync. separator will separate
the video information and synchronization pulses,
the slicing level of which is determine by RLOS and
RLO6.
Line flyback pulse is integrated by RLO7, CLOS and
subsequently coupled through CLO6 to pin 3. The pur-
pose is to compare with the input synchronizing pulse
to obtain the correct triggering time for the fine
oscillation. The DC level at pin 3 is adjustable by PLO1
to allow a small range of shifting in the picture. RL11
and CLO9 determines the frequency of the free-running
line oscillator and can be adjusted by PLO2. RL10
controls the lock-in range.
The frame oscillator frequency is determine by RFO1,
CFO1 and PFO1 (adjustable). The components DFO1,
CFO2, DFO2 are used to double the supply voltage
necessary
for
the
frame
deflection,
Pin
15
is
the
frame
output signal to drive the deflection coils, BAO2. The
S-correction required is achieved by CFO6 and the DC
feedback is obtained by RF04 and RFOS back into pin
10. PF02 controls the amplitude of the picture.
Pin 1 of the IC is the line pulse to drive transistor
TLO1. The collector voltage is step down via ULO1 to
provide sufficient base drive current for TLO2 —
switching transistor for the flyback transformer, ULO2.
The collector of TLO2 is connected to the deflection
coils, BAO3, which is driven by a linear sawtooth current
to produce the necessary horizontal scan. Linearity
of the horizontal scan is by LLO1 and S-correction
by
CL12.
CL11
is
the
tunning
capacitor
and
determines
the scanwidth,
The supply to the flyback transformer is the 114V rail
from the switch mode power supply. A damping net-
work of RL17, CL13 and LLO2 is provided to reduce
ringing on the picture. The secondary of the flyback
transformer is tap and rectified, before going to the
other stages of the set.

VIDEO AMPLIFIER
There are 3 similar stages of the video amplifier for the
3 electron guns. Basically, each consists of 3 transistors,
The video signal is coupled through CV50 and RV50
to TV50 Tr2SC2611, the gain of which is determined
by the ratio between the feedback resistor RV52 and the
parallel impedance of RV50, RV51 and CV50. CV50
is for frequency compensation, hence affects the amount
of overshoot in the signal. As the 3 electron guns have
different characteristics, this capacitor is chosen to suit
each individual gun. TV81, having the biasing divider
RV31, RV32 (in main board) acts as a constant current
source for TV50. It provides the necessary biasing for
TV50 and also determines the cut off voltage (RV31,
RV32). It also provides the necessary low impedance
required by the emitter of TV50. The emitter follower
TVO3 (on the main board), together with RV20,
provides a low impedance to enable a fast rise in the
signal and hence the switching ON of TV50. But when
the input signal is low, TV50 will turn OFF and the
collector voltage must rise rapidly. Due to the fact
that RV56 is of 15k the time taken to rise will be
delayed, hence, the active load, constituting of TV52,
RV57 comes in use. Of course, enough base current
must be provided by RV56 to turn ON TV52 and
therefore pulling the emitter to high at a much shorter
time, via RV57 and CE of TV52, DVS5O is just to pro-
vide the return path when the transistor TV50 is turned
ON again.
The 3 cut-off points for the 3 electron guns must not
change with time such that correct black and white
level is maintained. However, drift in characteristics
is inevitable and therefore a beam current sensor is
required to set the beam current at cut-off such that it
can be used as a reference for brighter signals, This
function is provided by TV51 together with TV80 and
ICTDA3506 on the main board. This IC produces
3 lines at low beam current just before the start of
every frame scan, The amount of beam current during
these 3 lines is monitored by the voltage drop in RV53
and fed back through RV54 to the IC TDA3506 pin
26. This is compared with the reference voltage inter-
nally and the result is the shifting of the DC level of the
output signal (input to the video amplifier) accordingly,
just before the start of every scan.
VIDEO PROCESSING
The IC tVO1 TDA3506 performs this function. It
provides brightness and contrast for all signals and
saturation control for composite signal via (R—Y),
(B—Y) at pins 17, 18. The signal switching between
composite input and RGB input (pins 12, 13, 14) is
by the voltage at pin 11, OV and 2V respectively.
The luminance signal is fed through the delay line VVO1
and matching circuitry TV04, RV33, RV34, RV04,
CV19 to pin 15 of the IC. This is used for the matrix
to obtain RGB signals from the composite signal.
The cut-off detector of the tube is by pin 26. Internally,
however, the IC receives the combined line and frame
pulses from the circuitry RBO1, CBO1, DBO1, RBO2,
RBO3, DBO1, RBO4, RBO6, RBOG, RBOS to pin 10.
This is used to control the counter for the correct
timing to produce the 3 reference lines (refer to video
output stage).
PVO1, PVO2 and PVO3 are the gain control for the
RGB output signals, hence setting of the white balance.
A beam current limiter is included in the IC, The func-
tion is such that the beam current being monitored
by RL21 (pin 4 of flyback transformer) is feed back
via DVO2 to the brightness and contrast pins 20 and 19.
Too much brightness and contrast will cause a high
beam current to flow and voltage at pin 4 of FBT to
go negatively, thus clamping the cathodes of DV0O1
and DV02 to limit the maximum beam current allow-
able. Hence, the maximum beam current in the tube is
controlled by RL21.
PVO04 is for saturation control in PAL mode and it
functions also as an intensity level control in RGBI
mode, The capacitors CV13, CV14, CV15, CVO7,
CV06, CV08 are for clamping purposes.
SOUND AMPLIFIER
The sound stage utilises the ICiISO1 TCA 830 SM. The
supply of which is tapped from the flyback transformer,
pin 10. As the amount of current drawn from the supply
varies with the output power, an additional circuitry
is required to prevent the picture size to vary with the
sound.
This stabilizing circuit consists of transistor TSO1,
BC639, DSO1, RSO1, RSO2 and RSO3. The purpose
of it is to absorb current when there is no sound input.
The sound input is coupled via CSO1 and volume con-
trol PSO1 to pin 6 of the IC. Pin 8 is the output. The
surrounding components are mainly for the frequency
response.

PAL/RGBI
MODULE
INPUT
PROCESSING
This
module
enables
the
set
to
operate
with
either
RGB!
or
PAL
signal.
Voltage
supply
for
RGBI
mode
is
by
the
regulation
network
that
comprises
of
T104,
DIO9,
RI3O
and
C106,
whereas
for
PAL
it
is
tap
directly
from
the
13V
rail,
Selection
of
each
mode
is
done
by
a
switch
on
the
front
panel
with
switch
at
RGBI
position,
pin
1
of
module
is
set
to
2V
by
RV21, RV22,
RV35
and
RV36
on
the
main
board.
This
enables
the
video
processing
IC
TDA
3506
to
accept
RGB
signals
of
1Vp-p.
Due
to
the
input
requirements
of
TDA
3506,
the
RGBI
signals
from
the
computer
(pins
6,
8,
10
&
15
of
module)
must
be
transformed
into
RGB
signals
of
1Vp-p.
This
is
done
by
1CO01
SN7407
and
its
surrounding
components.
The
intensity
signal
(pin
5
of
module)
is
integrated
into
the
3
RGB
signals
and
together
with
the
loading
resistors
RV12,
RV13
and
RV14
on
the
main
board,
RGB
signals
of
1Vp-p
are
obtained
for
the
video
processing
IC
TDA
3506.
PV04
from
the
main
board
is
wired
to
pin
13
of
module,
and
together
with
transistor
T101,
it
controls
the
level
of
intensity
from
zero
to
maximum.
An
additional
feature
of
the
module
enables
brown
colour
wherever
the
computer
produces
red
and
green
signals
only.
This
is
done
by
1CO2
SN7420
(Dual
4
input
NAND
gates)
and
transistor
T102.
The
task
is
to
reduce
the
green
output
level
by
RI21
and
D106
when
the
correct
combination
appears
at
the
input
lines.
Picture
synchronization
is
achieved
by
ILO1
TEA
2017
on
the
main
board,
and
it
accepts
only
composite
synchroniza-
tion
pulses.
Hence,
the
separate
horizontal
and
vertical
pulses
from
the
computer
have
to
be
combined
before
being
fed
to
1LO01.
This
is
done
by
transistor
T!03.
In
order
to
obtain
a
bigger
range
of
starting
position
for
the
display,
the
horizontal
pulses
is
shaped
and
made
variable
in
position
by
the
monostable
multivibrator
ICO3
SN74LS123.
The
RC
network
controlling
this
is
at
pin
15
of
1CO3
and
is
wired
directly
to
PVO7
on
the
main
board.
Transistors
T!05
and
T!06
differentiate
the
horizontal
pulse
to
allow
only
negative
spikes
into
pin
3
of
!CO3,
this
is
to
avoid
any
false
triggering
of
the
multivibrator.
Consider
now
the
switch
at
PAL
position,
a
voltage
at
BAO1
drives
transistor
T110
into
saturation,
as
such
pin
1
of
module
is
pulled
to
OV
and
the
video
processing
IC
TDA
3506
is
switched
to
composite
mode.
At
the
same
time,
DI17,
DI22
to
DI25
are
activated
and
the
signals
of
synchronization
and
RGBI
from
the
‘D’
connector
are
inhibited.
The
chroma
signal
is
fed
to
pin
1
of
the
PAL
decoder
IC,
1CO4
AN5620.
Here,
the
signal
is
processed
with
the
burst
gate
pulse
at
pin
3
and
the
line
retrace
pulse
at
pin
12.
The
outcome
is
the
colour
difference
signals
(R-Y)
and
(B-Y)
at
pins
14
and
15
of
module.
This
is
in
turn
supplied
to
the
video
processing
IC
TDA3506
at
pins
17
and
18
for
matrixing
into
RGB
signals
suitable
to
drive
the
video
amplifier.
Synchronization
signa!
for
the
PAL
mode
is
wired
to
BVO1
on
the
main
board
and
fed
directly
to
1101
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ELECTROLYTIC
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ALL
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BY
THE
MANUFACTURER,
ONLY
ALL
CAPACITANCES
IN
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UNLESS
OTHERWISE
STATED.
THEN
CAN
THE
ORIGINAL
OPERATIONAL
SAFETY
*FOR
COMPOSITE
VIDEO
BE GUARANTEED.
SCHEMATIC
DIAGRAM
FOR
PAL/RGBI
MODULE

TROUBLE SHOOTING
| |NO RASTER (POWER)
APPEARS
|
DOES
220VAC
APPEAR
NO
PAILUHE
OF
SWITCH
BETWEEN
THE
CROSSPOINT
na
GEENE
OF DPO1, DPO3 AND THE
CROSSPOINT OF DPO2, DP04
FPO1 OPENS TPO1 SHORTED
FAILURE OF !P01
YES
DOES 112V DC REGULATED VOLTAGE ABNORMAL | YES | ADJ PPO1 NO | FAILURE OF
APPEAR
BETWEEN
CP15
POS,
SIDE
112V
HCR
DRIVE
CCT
AND
GROUND
HOR
OP
CCT
FAILURE OF HOSE
CCT
FAILURE OF PPO}
YES
NOOR
DPS,
RPO6G,
RPOS
LOW FAILURE OF IPO1,
RP12, RP14
DOES
24V
DC
APPEAR
BETWEEN
NO
FAILURE
OF
RP16
CP17
POS
AND
GROUND?
CP16,
17,
DP11,
1L01
YES
CHECK
16V
DC
AT
NO
FAILURE
OF
RP17,
12V
REGULATOR
I/P
CP18, ILO2
FAILURE OF H. DRIVE CCT
YES
ABNORMAL
H.
OSC.
CCT
O.K.
FAILURE
OF
IL01
PLO2, CLO9, RL11
YES
ABNORMAL
H.
DRIVE
OUTPUT
FAILURE
OF
1L01,
TLO1
ULO1, CL19, RL12, RL15
“|

CHECK
H.
OP
SHORT
CIRCUIT
FAILURE
OF
HOR
OP
TRANSISTOR
TRANSISTOR
TLO2
OK
ABNORMAL
FAILURE
OF
FBT
(ULO2)
CL11,
BAOS
OF
DY
FAULTY
OR DISCONNECTED
NORMAL ABOUT
860 VP-P
FAILURE OF FBT (ULO2)
FAILURE OF 7V LOOP (RL19
DLO3, CL16)
RV82 OPENS
NO
CHECK CRT HEATER
NORMAL
FAILURE
CRT
= 600V
CHECK CRT SCREEN
VOLTAGE G2
TOO LOW OR O VOLT
FAILURE OF CV81, RV81
FAILURE OF FBT (ULO2)
FAILURE OF CRT
ABNORMAL
CHECK CRT ANODE VOLTAGE

ABNORMAL BRIGHTNESS
OF SCREEN
CHECK 200V DC ACROSS
CV80
OK
CHECK CATHODE VOLTAGE
NORMAL ABOUT 100 — 160V
CHECK G2 VOLTAGE
NORMAL ABOUT 600V
FAILURE OF HIGH VOLTAGE CCT
FAILURE OF CRT
ABNORMAL
FAILURE OF 200V LOOP
(RL19, DLO3, CL16, RV8O,
CV80)
Iv01
LOW OR CHECK VOLTAGE FAILURE OF
HIGH AT PIN 1, 3,5
of 3506 PVO1
ABNORMAL
FAILURE OF G2
VOLTAGE SUPPLY CCT
NORMAL ABOUT 6V
CHECK VOLTAGE AT
EMILLER OF TV0O1, TVO2
TV03
OK
FAILURE OF TV50, 51, 52
TV60, 61, 62
TV70, 71, 72
FAILURE OF TV80

it | NO COLOUR
ABNORMAL COLOUR
TTL ABNORMAL
COLOUR
ANALOG
TTL I/P
ANALOG
OUR?
NO
COLOU
ALIGNMENT
OK
YES
WHITE BALANCE NO ALIGNMENT BY
PV01, 02, 03
CHROMA
CHECK
SIGNAL
AT
PINS 1, 3, 5 OF
ivo1
CHANGE
PAL/RGBI
MODULE
CABLE
OKAY
NO REPLACE
ABNORMAL | FAILURE OF DBO1,
DBO02
FAILURE OF AMBIENT
COMPONENTS
NO FAILURE OF
CV20, RV37
CHECK SANDCASTLE
W.F. AT T.P. 15
oK
CHECK CATHODE
OF EACH GUN
T.P. 18
CHECK IDENT SIGNAL
AT PIN 12 OF
MODULE
CHANGE
PAL/RGBI
FAILURE
OF
CHECK
T.
P.
NO
MODULE
ivo1
19
FAILURE OF
AMBIENT
COMPONENTS
CHECK T. P. No
20
FAILURE OF
CRT
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A A
15
FAILURE OF IV01
FAILURE OF AMBIENT
COMPONENTS
FAILURE OF
TVv01, TV5O,
Tv51, CV5O,
TV52
FAILURE OF
TV02, TV6O,
TV61, CV6O,
TV62
FAILURE OF
TVO3, TV70,
TV71, CV70,
TV72

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