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IND100 /INDIANA 100 CHASSIS
#G The notes following refer to all common parts on the Indiana
100 and Indiana 200 chassis which are virtually identical. For
uncommon data refer to the Indiana 200 section.
A/V MODULE
#1 A/V Module Manual and Electronic Switching versions.
The majority of these modules were manually switched with a
slide switch on the rear of the cabinet. The electronic
switching version is on Romanian sourced chassis only.
AUDIO. Essentially the audio section consists of a RF
Oscillator which is Frequency Modulated with Audio. If there
are any problems the RF frequency measured at K202 should be
6Mhz for UK operation and 5.5Mhz for European operation.. this
is unmodulated.
VIDEO. The Video stage is a 2x amplifier with a 75R input
impedance. The video is connected to the main chassis via K100.
Electronic switched versions are controlled from the TCR panel
and are only found on INDIANA 200 Chassis.
#2 AUDIO IF.
The audio If is contained in the Jungle Ic Ic100 and is
associated with pins 11,12,13,14 & 15.
NO OUTPUT
Check Z101,C109, C123 & C111. Check control voltage from IC300
and assoc filter, should vary from 0 - 2.5V.
LOW OUTPUT.
Check alignment of L101 and Z101 for correct type.
Check control voltage from IC300 and assoc filter.
VISION BUZZ.
Check R111, Z101, alignment of L302.
#3 AUDIO OUTPUT.
Audio output is via Ic 200 and is a straight forward output
stage.
Supply Voltage 26Vdc. Current 440 m/a at full volume.
NO OUTPUT.
Check R200,IC200, Print and pads around K201,Loudspeaker O/c,
No input from If stage.
DISTORTED OUTPUT.
Alignment of L101,C202 leaky, damaged loudspeaker.
#4 COLOUR DECODER (TEXT) TDA3561A
A Common device which incorporates Luma, Chroma processing,
and RGB source switching.
NO PICTURE.
Check V+12 on pin 1.
Super Sandcastle on pin 8, this should be a 50/50 pulse height,
if the ratios are not 50/50 then the picture will mute.
The Blanking signal on pin 9 should be 0V,if not check blanking
signal from Text Ic via D903(Ind 100).
NO COLOUR.
Check Chroma input on pin 3 this should be 0.6V p/p.
To Un Kill the colour killer connect pin 6 to +12V.
Check Colour level control voltage pin 6 this should vary from
0-2.5V, if 0V then check back to control panel IC100.
ONE COLOUR MISSING.
If one output is missing from K501 check de-coupling capacitors
C521,522,523.
#5 COLOUR DECODER (non Text) TDA3565
This is a similar decoder to the TDA3561A, with the exception
of no RGB inputs for Teletext. The other difference is pin
connections. The fault guide is the same as for the TDA3561A.
#6 CRT BASE
There are two types of Crt Base one for 29mm Narrow Neck and one
for 22mm Mini Neck tubes. In most cases R717 will be 1R0 for
29mm and 2R2 for 22mm bases. If you have to change bases due to
a Crt change check the value off R717.
ONE COLOUR (Blue) Full on.
This is usually on 22mm bases only and is caused by flash-over
from the Focus pin to the Collector of Q703. When replaced bent
Q703 away from the Crt socket.
ONE COLOUR FLASHING or full on.
Check emitter de-coupling cap (150pf) of affected colour.
FULL BRIGHTNESS WITH FLY-BACK LINES.
Check R731 100R o/c, this can be caused by Crt Flash-over.
CANNOT SET ONE GUN CUT-OFF.
Check the respective colour drive Transistor and Diode.
CANNOT SET ALL CUT-OFFS.
Check bias components and Tr702, R710.
#7 REMOTE CONTROL HANDSETS
There are 3 versions of handsets the earlier type being fitted
with a SAA1250 Ic. This can be easily identified due to its
tapered nose. The later versions are shorter and thinner and
contain either a OSH2006 or OSH1010.
Both types can be used for Programming Eeproms..see Manual.
NO OUTPUT.
Check battery leads,Dry joints on I R Diodes and Ceramic
resonator.
#8 HORIZONTAL STAGES.
The driver and output stages are very conventional, supplying
Crt Ht, Eht, Focus, A1 and Heater voltages, from T602.
HT SUPPLY CURRENT AT Max Beam 490 m/a. At nominal beam 250 m/a.
HORIZONTAL DRIVER.
NO OUTPUT.
Check drive from Ic100 pin26 this should be 0.7V P/P.
R607 Ht feed 5K6 3W 0/c, on earlier chassis this was a 2W carbon
film resistor, it must be replaced with a special from our
spares dept.
HORIZONTAL OUTPUT.
NO EHT.
Check Ht +112V
Check drive from Q601, this should be 90V P/P on Collector of
Q601.
Shorted turns on T601. (observe outer casing for blisters).
LOW/HIGH EHT.
Check Ht +112V
Check value of C605 especially if Crt has been changed.
If Eht is low check continuity of D/Y coils and connectors.
Raster Wide/ Narrow.
Check Ht +112V.
Check T601 shorted turns.(observe outer casing for blisters).
If new Crt has been fitted,check it needs a Loss Coil and is it
adjusted correctly. Also check CRT data to see if C605 needs
changing.
C604 does not affect Width only Linearity.
Super Sandcastle. If the Horizontal part is incorrect check
C606,R603,R613 and D604.
#9 I R MODULE AND CONTROL PANEL
This is a simple module with a virtual zero failure rate.
NO OPERATION.
Check IC303, D308 and K302. Also the wire connections to the Pcb
can give problems if the panel is removed several times.
The Control buttons are of a 4pin matrix with carbon shorting
dot, they give very few problems, however some chassis from
Romania (NE1461) used a local supply switch and are not very
reliable and are NOT interchangable.
#10 IF JUNGLE IC100. TDA4505 /TDA8305
Effectively the two devices are the same but are NOT inter-
changable due to Pins 11 and 19 being interchanged.
As the term "Jungle" suggests this device has a number of
different sections in one package, and are as follows :-
Vision IF, Sound IF, Sync seperator, Agc processing, Line and
Vertical oscillators, Afc control and Super Sandcastle
generator.
VISION IF.
NOISY PICTURE AND OR VIDEO SMEARING.
Z100 Saw Filter faulty, C105 o/c, C106 s/c, C144 s/c if fitted.
L302 Video det coil off alignment, see manual for alignment.
BLANK RASTER.
L302 Video Det Coil o/c, Q101 s/c, Muting voltage on K100 P3 at
+12v, C120 s/c, C107 s/c, No output from P17 or video lost in
path towards Q103 and decoder. Q101 mute transistor s/c,
C120 s/c.
SYNC SEPERATOR.
NO SYNC.
C118 o/c, R129 o/c C113 s/c.
POOR SYNC AND PICTUREEXCESSIVE GAIN.
C113 leaky.
HORIZONTAL OSCILLATOR.
NO OUTPUT P26.
Any component connected to pins 23,24,27 & 28.
LINE FREQUENCY INCORRECT.
R125 High, C116 leaky,R122 High, C114 leaky, R119, C115.
LINE PHASING OR PICTURE SHIFT INCORRECT.
C112 leaky, R114 high, R117 o/c C126 leaky.
VERTICAL OSCILLATOR.
NO OUTPUT.
R104 o/c, C100 s/c, C102 s/c, R002 o/c, R001 o/c, D001 s/c.
VERTICAL FREQUENCY INCORRECT.
R104 High, C100 leaky.
SOUND IF.... see Audio IF section 2.
AGC CONTROL.
PICTURE OVERLOAD.
The Agc take-over point is set by R105/R107 de-coupled by C101,
if a different type of tuner is fitted there components should
be changed to suit... see manual for values.
AFC CONTROL.
TUNING DRIFT.
The Afc set point is set by R012/R013 and is fixed at 6V for an
IF input of 39.5Mhz with L302 correctly set... see manual.
If drift occurs the fault is usually found elsewhere.
SUPER SANDCASTLE.
If there is a problem with the Sandcastle it is unusual for the
Ic to cause the problem, more likely the Pulse sources,ie Line
or Frame Stages will be at fault.
#11 POWER SUPPLY.
This is a conventional modern Switch Mode Power Supply
utilizing a Foil Wound Transformer. The supply is operational
irrespective of whether the Tv is in stand-by or not.
The best way to approach this Stage is to monitor Pin 9 Vcc 1st
if the voltage is approx 8.5v, then put scope on pin 7 to
monitor drive pulses to Q800. see below for different faults..
Current avaliable. HT 115V 490 m/a at max beam current
250 m/a at average beam current.
+26V 650 m/a at full volume.
210 m/a at zero volume.
+12V 360 m/a.
WILL NOT START UP ( No pulses at Pin 7.)
F800 o/c, R801 o/c, R802 o/c (this is a Thermister and should
read 4K7 when cold).R803 o/c, R808 o/c, R815 o/c, R816 o/c, C814
o/c, C819 S/c, D804 s/c, IC800 faulty.
WILL NOT START UP ( 1 pulse every 300m/s at Pin 7).
R812 o/c, R814 o/c, C810 o/c, L801 o/c, D804 o/c, Q800 o/c, T801
winding P3-P5 o/c.
UNCONTROLLABLE HT.
R811 o/c, R810 o/c, D807 o/c.
SLOW START-UP
C810 Leaky.
NO ENERGY TRANSFERED (but 20m/s bursts of pulses).
C809 o/c.
Q800 SHORT CIRCUIT. R801 o/c, Bridge Diodes o/c.
R809 high. THIS MUST BE REPLACED WITH A VR37 HIGH VOLTAGE TYPE
SUPPLIED BY NEI SPARES DEPT.
TRIPPING AT 1Hz (Chirping sound).
Q600 s/c, D809 s/c and any components on secondary of T801.
NO OR LOW ENERGY OUTPUT ( Transformer squealing and Q800 Hot).
T801 Insulation Failed. Also check T601 (Loptx) for short
circuit windings (blister on body).
F800 BLASTED.
Q800 shorted to the Heatsink. L802 touching R806.
NO 12V SUPPLY TO MAIN CHASSIS.
R844 o/c, IC803 control voltage pin 1 at 0v caused by Q809 s/c
or fault on Controller panel. To verify remove plug K804 and +12
line should appear.
TV APPEARS TO GO TO STANDBY.
This can be either (Time-out) see section 15, or an intermittent
supply failure, they both have the same apparent effect.
The only way is to monitor the Ht supply with a lamp (disconnect
Q600) and see what happens.
It is known that T801 can have an intermittent winding to pin
connection, and if the wetting current is not high enough,
oxidisation may cause the connection to fail and thus feedback
missing will cause the Psu to stop momentarily. After a short
time the connection may be remade and the Psu will resart, but
the Tv will remain in stand-by until another instruction is
received, either from the handset or switch contacts.Also
L801 has started to show signs of failure, this could be
intermittent and the drive to Q801 goes missing.
TRAVELLING HUM-BAR ON ROGHT OF SCREEN ( visible from bottom of
screen to about 1/2 way up).
L800 Mains filter wrong value or faulty core.
#12 SECAM MODULE.
Not fitted to Uk supplied televisions.
#13 TELETEXT.
The Teletext chipset is controlled from the Microcontroller by
an ITT Bus system. It is a 4 chip solution, with a 4 page
memory.
SYSTEM WILL NOT GO TO TEXT MODE.
Check power supply IC904 for +5v output,if this is low
disconnect all 5V pins.
Check Clock Oscillator Q900, this can stop oscillating at low
temperatures if R902 is not 150R.
CORRUPT TEXT.
Check alignment of L302 video detector coil,try turning 1/4 turn
either way to improove.
IC901, IC902, IC900 may be faulty.
GOES TO TEXT BUT WITH FLOATING HEADER.
There is probably no video input via K900, or a fault with Q905.
GOES TO TEXT MODE BUT NO DATA ON SCREEN.
30 March 19951 This can occur at switch-on and is due to the
reset line of the Micro-controller resetting too fast, add a
10uF across base/ emitter of Q305 on controller pcb.
If there has been a failure of IC301 (Memory) on the controller
panel, the contrast level of the Text which is stored there,may
be incorrectly set.. to reset see Mk2 manual.
Check R G B outputs on IC902, and Q901-903.
Check 5way ribbon cable from Controller pcb to Text pcb
K308-K901.
GOES TO TEXT BUT APPEARS NEGATIVE.
Q904 s/c
GOES TO TEXT BUT FRAME JITTERS.
Frame sync wire not connected to R933 or disconnected from
main pcb R412 (no connection No).
#14 TUNER
Early chassis used Telefunken 2000 tuners and later chassis
and Indiana 200 chassis used telefunken 3010 tuners. Both
these types cause little trouble except some 3010 types are
susceptible to Striations....
TUNER DRIFT.
Invariably not the tuner, if suspect, disconnect Tuning voltage
pin and connect a known stable voltage source, and monitor
result.
LOW GAIN.
Check AGC voltage, should be about 10v.
STRIATIONS.
Some tuners are susceptible to Striations, these can be reduced
by changing C009 to 100uF 25v. Also it may be necessary to
change the Tuner for a U910 type.
#15 TUNING CONTROLLER IC300/IC301
Although called the Tuning controller this panel controls:-
Tuning, Contrast, Brightness, Colour, Volume and Teletext.
NO DISPLAY OR FUNCTIONS.
Check IC302 5V regulator, if low output disconnect all pins
connected to +5V line until voltage is restored.
NO FUNCTIONS,DISPLAY STUCK.
Check clock oscillator X300, if loaded with a scope probe you
may stop the crystal,so check pin 13 (Tuner control voltage
pin) this should be a Squarewave 5V p/p. Also check the display
and keyboard strobe pins, again 5V p/p.
TWO OR THREE BUTTONS NOT OPERATING.
Almost certainly these buttons will have a common factor,
check connections of ribbon cable to control pcb.
FUNCTION BUTONS NOT DOING JOB STATED.
Almost certainly the set-up conditions of the Micro have been
corrupted, this is stored in IC301, it is not necessary to
replace the device, just reprogram as per MK2 manual.
WILL NOT STORE ( although ( ) is displayed).
IC301 faulty, D302 20v zener faulty. D303 s/c.
AT POWER ON A BLANK RASTER IS DISPLAYED. (Text only).
See Section 13.
COMPLETE FAILURE OF IC300 or corruption of IC301. This may also
show as going to stand-by.
Crt Flashover or a Large Static buildup, can be protected
against by fitting a 470N cap across Pins 20 and 27 of IC300.
TUNING DRIFT.
This is usually where "tuning drift" occurs, Check the T/U
voltage on an Oscilloscope and the DC variation will be seen.
If this is the case check Q309, C312 leaky, R329 noisy, R330,
R331, R332, R333, C314/C315 leaky. D001 33v reference diode.
FAILURE OF VOL/CONT/BRI/SAT FUNCTION.
Check relavent output pin on Micro for varying squarewave,
or filter components.
FAULTY BAND SWITCHING (Irish sets only).
This circuit uses a 2 line to 3 line converter,
and it is obvious that all components associated with this area
can be suspect.
TV WILL NOT COME OUT OF STAND-BY.
To bring this set out of stand-by an extra pair of contacts on
the mains switch are used, via K305. Some customers do not
operate the switch correctly, which should have an operation
duration long enough to allow the supply to rise, and enable
the micro to recognise the contacts being closed.
TV GOES TO STANDBY (usually after a finite time. 5mins).
This is due to the initialisation of the Micro, if it set wrong
it is looking for the Ident signal from IC100. In this chassis
the Ident is not connected, thus the Micro will Time-out.
To stop this,look in the memory contents (see Mk2 Manual)
and reset the appropiate bit.
TV GOES TO STAND-BY.
Excessive static build-up may also disrupt the IC, to
eliminate this fit a 470nF cap between pins 20 & 27 on the
track side. This may also be a power supply interuption (see
power supply section).
#16 VERTICAL OUTPUT IC400 TDA3653
This is a conventional output stage of the modern style,
utilising AC and DC feedback to the Jungle IC Ic 100, to
maintain a constant Height and Linearity.
Supply voltage =26V dc. Current 210 m/a (21"Crt).
LOW HEIGHT (no picture unless A1 turned up,no tuning function).
D001 ZTX33 failed due to Crt Flashover, this is more usual on
20ins sets using an Orion 22mm Crt. D001 provides the
reference
voltage for the Frame Oscillator as well as Tuning Voltage. To
protect D001 replace C001 (1Nf) with a 100nF capacitor, and fit
a 100nf across IC300 pins 36/41,to protect the Micro on Ind
200.
FULL FRAME COLLAPSE.
See Section 10 for Frame Osc faults.
C400/C401 (4n7) cer disc leaky. R402/R403 high or o/c, C402
s/c, R401 o/c, IC400 faulty (unusual). R412 o/c, Connector K400
broken tracks or pads, PCB tracks and pads broken on IC400,
due to physical stress.R411 o/c. C406 s/c.
POOR LINEARITY (Lack of Height).
C408 leaky, C407 leaky, R407/R408 High, D400 leaky, C403 leaky,
R409 faulty.
PICTURE SHIFTED (cannot recentre).
R405/R413 high, C407 leaky.
HUM-BAR ON VERTICAL SCAN.
See Section 11 (Power supply).
D806 leaky, C815 o/c.
LINE PAIRING AND VERTICAL JITTER
CRT Dag earth o/c.