Mattel Electronics IntelliVoice 3330 User manual

MATTEL .ELECTROfllK
SERVICE MANUAL
iNtEiuVoice
VOICE SYNTHESIS MODULE
MODEL 3330
MATTEL ELECTRONICS
5150 Rosecrans Avenue
Hawthorne, California 90250

INTELLIVOICE
SERVICE MANUAL
TABLE OF CONTENTS
Operation 2
Technical Description 3
Preliminary Checklist 4
Troubleshooting 5-6
Disassembly
Figure 3—Exploded View 8
Figure 4—PCB Component Layout 9
Figure 5—Schematic Diagram 10-11
Parts List 12
TOOLS AND EQUIPMENT REQUIRED
Intellivision Master Component
Color TV Receiver
Basic Electronic Hand Tools
20 MHz Triggered Oscilloscope
Digital Multimeter (DMM)
Intellivoice Game Cartridge
-1-

VOLUME
CONTROL
MASTER
COMPONENT
INTELLIVOICE
MODULE
GAME
CARTRIDGE
INTELLIVOICE
CARTRIDGE PORT
Figure 1—Intellivoice Module
OPERATION
1. Insert Intellivoice module into the Master
Component Port {as if it were agame car-
tridge) as shown in Figure 1. Be sure it is
plugged in all the way.
2. Insert an Intellivoice game cartridge into the
Intellivoice Game Port. Standard Intelli-
vision cartridges will provide the same
gameplay as if they were plugged directly
into the Master Component. Only specially
marked Intellivoice cartridges include
commands that operate the Intellivoice
unit and add human voices electronically
to the gameplay.
3. Use the volume control on the TV set to
adjust the level of the game's sound effects.
Then use the thumbwheel volume control
on the Intellivoice unit to set the voice
sound level (counterclockwise to increase,
clockwise to decrease).
-2-

TECHNICAL DESCRIPTION
The Intellivoice voice synthesis module
produces audio speech signals when used
in conjunction with the Intellivision Master
Component (M/C) and aVoice Synthesis
game cartridge. Standard Intellivision (non-
voice) game cartridges may be operated with
the Intellivoice module but no voices will be
heard. The volume control adjusts the voice
loudness level. This control does not affect
game sound effects —only voice. The volume
level is increased by rotating the knob
counterclockwise.
Referring to the Intellivoice schematic
(Figure 5), the Intellivoice module is placed
between agame cartridge and the M/C.
Data/Address Bus Lines DB0-DB15 (carrying
game information) and Bus Control Lines
BC1, BC2 and BDIR (Bus Direction) go
directly from the game cartridge to the M/C.
This is how the M/C is able to utilize both
Voice and non-Voice cartridges through the
Intellivoice module.
In observing human speech on an oscillo-
scope, it is seen as acomplex combination
of sine waves. Digital circuits, however, know
only digital ones and zeros, ahigh or alow
voltage. Digital circuitry cannot store speech
in its analog form. Speech synthesis circuitry,
then, must be able to generate the complex
speech waveforms from adigital code. If a
spoken word were divided into, say, ahundred
parts then we could assign each part adigital
code which would correspond to its pitch,
volume, and other variables. Digital circuitry,
in this case, could generate speech from this
digitally-encoded signal.
The digitally-encoded speech segments can
come from the M/C or from memory within
the Speech Synthesizer IC (U3) itself. Speech
segments stored in U3 are in permanent Read
Only Memory (ROM), each segment address-
able when the proper address code is pre-
sented to the chip. Custom speech segments
from the M/C change with each different
game cartridge used,
Buffer/Interface IC U2 will allow addresses
of speech segments to pass onto D0-D7 (called
the Peripheral Data Bus) when Control Lines
BC1, BC2, and BDIR are in the correct state.
When custom speech segments are presented
from the M/C, U2 first converts them from
parallel (multi-wire bus) to serial (single-wire
bus). The serial data output is then loaded into
U3, the Speech Synthesis IC. This part is
controlled by control lines C1, C2, and C3,
originating in U3.
Regardless of whether the digitally-encoded
speech segments come from U2 (and the
M/C) or from the ROM within U3, the speech
segments are presented to the Vocal Tract
Model. The Vocal Tract Model consists of
electronic circuitry designed to imitate human
speech patterns, utilizing 17 different param-
eters to generate speech.
The output of Speech Synthesizer U3 is not
conventional audio, but is Pulse Width Modu-
lated (PWM). When viewed on an oscilloscope,
this appears to be a square wave whose edges
rapidly expand and contract as speech genera-
tion takes place. The signal is then sent to a
series of filters. First in Tine is C3, which acts
as a high-pass filter. This helps to limit low
frequency response to 150Hz.
Next in line are two active filters U4C/D and
U4A/B, and their associated components.
These two active filters attenuate frequencies
above 5KHz. Capacitor C8 is another low-pass
filter, and is responsible for removing most
of the "hash" sound from the PWM. The Volume
Control is next, which feeds U5A, abuffer
amplifier. Capacitor C14, connecting the
output of U5A to its inverting input, composes
alow-pass filter, further limiting the response
above 5kHz. C9 and R25 comprise the final
high-pass filter, allowing signals above 150Hz
to pass.
U5B and its circuitry is used to generate the
+1.8VDC bias used as an artificial ground
reference by the active filter networks. R7
and R8 are connected as a standard resistor
divider network so that 5V input yields 1.8 V
output at TP17. The current drain through
the divider is only 10mA, so even asmall current
drain at TP17 will upset the voltage at this
point. Since an OP Amp has avery high input
impedance, the non-inverting (+) input will
not affect the voltage at TP17.
The voltage at the +input of U5B (1 .8VDC from
the resistor divider) will force the output volt-
age to +1.8VDC. The output voltage is then
fed back to the inverting (-) input. In an OP
Amp, if the inverting input voltage changes
(such as more positive) then the output will
change in the opposite direction (less positive).
Also, the output voltage will change, trying to
force the -input to equal the +input. Say, for
example, the output voltage of U5B decreases.
Acorresponding decrease at the -input will
force the output voltage to increase until the
voltage at the -input equals the voltage at
the +input.
-3-

PRELIMINARY CHECKLIST
Before you refer to the TROUBLESHOOTING section which follows, look at this list of possible quick
solutions. Then, if any problem persists, you should be able to find it in TROUBLESHOOTING.
CHECK
1. Check that the Master Component
and television operate property.
2. Check that jumper block is
property connected.
3. Check operation of Intellivoice unit,
PROCEDURE
Insert the Diagnostic Test Cartridge directly into Master
Component and run Diagnositc Routine. Make sure that
the Master Component, RF cable, Switchbox and Television
are functioning properly.
Remove Port Cover on top of Intellivoice unit. Jumper
block should attach to stacking connector as shown in
Figure 2.
Plug aknown-good Intellivoice game cartridge into Intelli-
voice game slot. Game play should be normal and voices
heard when appropriate keypad buttons are depressed.
Figure 2—Inserting Jumper Block JB2
-4-

TROUBLESHOOTING PROCEDURE:
Instructions: Starting at step 1, follow each test in numerical order. The correct voltage
or waveform being measured will lead you to the next step; an incorrect
measurement will lead you to the defective component.
Check Intellivoice module. Intellivoice game
cartridge, and Master Component (M/G) as
described in Preliminary Checklist.
Intellivoice does
not fail
intellivoice has no apparent defect. Still,
check for worn contacts on J1 and bent
socket pins on J3.
oI
Graphics OK
Voices not OK
Measure M.6 VOC at TP 17 (Pin 5of U5>.
o1.8V OK
Measure -1.8 VOC at TP 18 (pin 7of U5).
o1.8V OK
Check lor correct waveform atTP 13. Square-
wave appears continuously, shifting occurs
only during speech. Depressing and releas-
ing RESET button will cause speech to be
generated.
©Waveform OK
Check for correct waveform at TP 14. Audio
waveform should be seen during speech.
Squarewave should nol be seen at any time.
oWaveform OK
Check tor correct waveform at TP 15
©Waveform OK
Check for correct waveform ai TP 16.
©Waveform OK
o
intellivoice
fails iCheck that Jumper Block J82 is connected
correctly (Figure 2). J82 0K
JB2 Not
OK
Plug in new Jumper Block.
i
Gameplay graphics (picture) is correct but
voice sounds are distorted, low in volume,
or missing.
i
Graphics Not OK
Voices Not OK
1.8V
Not OK i
1.8V
Not OK
Waveform
Nol OK
Waveform
Not OK
Waveform
Nol OK
Waveform
Not OK A
Check R25 Check continuity ot PC Board
traces from R25 to pin 6of J1
Check R7 and R8. Check U5 by substituting
with aknown-good one.
Check C2. Check for shorted traces or com-
ponents on the +1.8VDC line. Check U5 by
substituting with aknown-good one.
Check R9. R10, and C13. Check U3 by sub-
stituting with aknown-good one. Check Y1
and C1 by looking for 3.12 Mhz across TP 9
and TP 10. Check U2 by substituting with a
known-good one.
II no audio waveform seen, check C3. C4. C6.
andCB. Also check R11.R16. andR21. If dis-
torted audio waveform seenor heard through
TV set. check C4. C5, C6. C7. and C8 Check
U4 by substituting with aknown-good one.
Check Volume control R23. R24. and C14.
Check U5 by substituting with aknown-good
one
Check C9
i
_^-

*
11
I
oo e
Disassemble Intellivoice module. Insert
Intellivoice P.C. Board into M/C and Intelli-
voice game cartridge into game slot. Support
underside of Intellivoice P.C. Board.
Measure *5 VDC
at Test Point fTPJ 7. 5V0K Measure +5 VDC at pin 18 of U2. pins 7. 19,
and 23 of U3. pin 4of U4. and pin 8of U5.
SV Not OK 5V Not OK
Check that Jumper Block JS 2 is connected
cofrectly (Figure 2). Check that "fingers"
on J1 make proper contact with M/C.
oGameplay graphics are incorrect or missing
and voice sounds are distorted, low in
volume, or missing.
oGraphics Mot OK
Voices Not QK
Turn of* power and remove both U2 and U3.
Apply power and check for proper graphics
(picture). Voice will not be beard.
©
Graphics
Not OK
Graphics OK
Swap aknown-good U2 and U3 until the
faulty IC is located.
o3
4Check for correcl waveform at TP 2.
©Waveform OK Waveform
Not OK i
Check for correct waveform at TP 3.
©
Zf
Waveform OK Waveform Not OK i
Check for correct waveform at TP 1
©Waveform OK Wavelorm
Not OK i
i:
Check coflecior of Ql for no signal and VDC
©}
No Signal
No DC Voltage
Signal or DC
Voltage Present <
Remove power and check resistors R28-R35
©Resistors OK Resistors
Not OK 4
Check J3 and Jlfor broken, bent or damaged
contacts. Check continuity from each contact
ot Jl and J3 lo its destination
Repair break in Vcc line
of PC Board.
Locate break in foil of P.C. Board. Check
copper "fingers" of Jl and socket pins of J3
Check R4. Check U1 by subsiilulrng with a
known-good one :
Check R5 Check U1 by substituting with a
known-good one ]
Check Ri. R2 an^ R3 Check Uf by subsh-
tuting wrth aknown-good one ]
Replace Q1
Replace appropriate resistors
5V0K
_ft_

DISASSEMBLY
WARNING:
PRECAUTIONS AGAINST STATIC DISCHARGE MUST
BE TAKEN WHEN HANDLING THE INTELLIVOICE
P.C. BOARD AND INTEGRATED CIRCUITS.
1. Turn Intellivoice unit upside down and remove three Phillips head screws,
2. Turn unit right-side up and remove top housing.
3. Remove three Phillips head screws securing P.C. board and metal shields to lower housing.
4. Remove P.C. board and metal shields from lower housing. Carefully slide nosepiece of P.C. board
away from lower housing.
5. Remove upper and lower metal shields from P.C. board. If metal shields are soldered in place,
unsolder tabs and remove metal shields.
DISASSEMBLY NOTES:
-7-

Figure 3—Exploded View
-8-

I
Figure 4—PCB Component Layout
-9-

J1
III
111
111
ghi
J1-18,20l22,24 l26&28
RF GND
BD1R OUT
BC2 OUT
BC1 OUT
BC1 IN
BC2 IN
BDIR IN
MSYNC
BCi
BC2
BDIR
DB15
DBU
DB13
J3- 22,24.26,428
IRF GND
RF GND r1.44
40
NOTES: 1.
2.
3.
34
Unless otherwise noted, all resistance in ohms, a
capacitance in microfarads.
All voltages ±10%.
All voltage and scope measurements taken with
Intellivoice module inserted into Intellivision
Master Component, 120VAC applied to Master
Component.
35
29
25
DB12 <-
DB11 <r
DB10 <-
DB9 «-
DB8 «r
D87 <r
DB6 <-
DBS <-
DB4 <-
DB3 <-
23
19
15
11
39
13
17
21
DB2 <r
DB1 *
DBO <-
MCLK 4>
VCC -5V <-
EXTAUD «-
RESET <-
27
31
33
10
43
12
EXT VIDEO <-
GND
NC
CBLNK
NC
NC
RMHC
44
1
14
30
16
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REN
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AND LATCH
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27
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GAIN
R22 200K
C3 0047 5%
R10 330 5%
>5V C4 0047 5%
R12 3.9K 2%
8SBY TP12
mnc
19
SE -5V
22 R27 12K 5%
-NW-
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TEST 1
R17 12K 2%
C6 .0047 5% ^
R21 12K 5%
Ww TP14
C8 0047 5%
LM324C
R14 6.34K 1%
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r—
Figure 5—Intellivoice Schematic
•1 8V 18V
J2
JUMPER BLOCK
-10- RCL M^ OS r.StHHit /^ -11-

PARTS LIST
REFERENCE
DESIGNATION DESCRIPTION PART NUMBER
PCB
Ut
U2
U3
U4
U5
Q1
R1
R2fR4, R5
R3
R7
R8
R9, RIO
R11, R16
R12
R13,R15, R18, R20
R14
R17
R19
R21, R27
R22
R23
R24
R25
R26
R28-R35
P.C. Board Assy, with all parts
IC, Triple 3-input NAND 74LS12
IC, Buffer/Interface SPB-640
IC, Speech Synthesizer SP-0256
IC, Quad OP Amp LM-324C
IC, Dua10PAmpLM-358C
Transistor, PN 2906
Resistor, IK Ohm 5% 1/4W CF
Resistor, 2.2K Ohm 5% 1/4W CF
Resistor, 180 Ohm 5% 1/4W CF
Resistor, 180K Ohm 5% 1/4W CF
Resistor, 10QK Ohm 5% 1/4W CF
Resistor, 330 Ohm 5% 1/4W CF
Resistor, 16K Ohm 2% 1/4W CF
Resistor, 3.9 KOhm 2% 1/4W CF
Resistor, 8.2 KOhm 2% 1/4W CF
Resistor, 6.34K Ohm 1% 1/4W MF
Resistor, 12K Ohm 2% 1/4W CF
Resistor, 3.83K Ohm 1% 1/4W MF
Resistor, 12K Ohm 5% 1/4W CF
Potentiometer, 200K Ohm
Resistor, 5.6K Ohm 5% 1/4W CF
Resistor, 22K Ohm 5% 1/4W CF
Resistor, 430 Ohm 5% 1/4W CF
Resistor, 8.2 Ohm 5% 2W CF
Resistor, 47K Ohm 5% 1/4W CF
3330-9229
0086-0171
0086-0173
0086-0172
0098-1210
0086-0170
0086-0330
0095-0781
0095-0861
0095-0601
0095-0322
0095^0262
0095-0661
0084-0405
0084-0345
0084-0377
0084-0923
0084-0393
0084-0924
0095-0996
3330-0030
0095-0961
0095-0102
0095-0691
0084-0927
0095-0182
C3-C8 rC14
C2
CI
C9
C10-C13
Capacitor, 0,0047uF 100V Polypropylene
Capacitor, 10uF 10V Elect
Capacitor, 100pFx2 Network
Capacitor, 4.7uF 25V Elect.
Capacitor, 0.01 uF 12V Cer. Disc.
0085-2630
00850003
0086-0705
0085 0025
00964020
Y1
JB2
J2
J3
1
2
3
4
5
6
7
8
9
10
11
Ceramic Resonator 3.12MHz
Jumper Block
Connector, Stacking 30 pin
Connector, Edge 44 pin
40 pin low profile IC socket
28 pin low profile IC socket
Upper Housing Assy. incl. inlay
Inlay, Upper Housing
Lower Housing Assy. incl. label
Wheel, Volume Control
Port Cover
Screw 8-18x3/8"
Screw 5-20x7/16"
Upper Shield
Lower Shield
Packing Carton, Individual
Packing Material
Instruction Book
0089-0818
3330-9609
0089-0021
0089-0022
0099-0260
0099-1530
3330-9199
3330-6449
3330-9109
1149-2039
3330-2059
0405-0176
0405-0842
3330-4169
3330-4179
3330-0910
3330-0660
3330-0920
-12-