VC2 Technical Specs.

[grynner]

c&p from another site, thanks goes to who is responsible.

VC2 Technical Specs

1. The best way to tell what kind of VC2 board you have is to look at
U-24. A C4 or 010 has a 4*, 018, & 019 have a 5*, 032 boards has a
7* marking. A lot of boards has been covered over with a black
marker, these boards are most generally 018. You can use a regular
eraser to remove the black mark.

2. If inductors L1 & L2 turn brown replace them. U1 & U2 should also
be checked if L1 & L2 are replaced.

3. Do not adjust any of the POTS on the VC2 board unless you know what
you are doing a frequency counter is recommended. R56 sets the
voltage on pin 3 of U-14. R23 adjusts the width of the character
display. R28 adjusts the clock frequency of U-7 it should be
1.99113 MHZ at pin 18 of U-7.

4. If the measured AGC voltage at the test point behind the battery is
more then 2.5 to 3 volts on a strong VC2 signal then suspect CR8.

5. If the VC2 signal is slow in being detected suspect CR-8. This
component changes resistance upwards with age. A temporary fix is
to solder a 4.7 K to 10 K ohm resistor piggy back style to resistor
R-88, it's located behind the CR-8.

6. If the board spits that is the audio sounds like a snapping sound
this is caused by the clock running in spurts; through age the
frequency is not held at a constant level. By turning the
adjustment screw on R28 counter clockwise at 1/16 of an inch should
eliminate the spitting.

7. VC2 needs constant reset. Check pin 8 of U-29 for a square wave
signal. If a square wave signal is present replace U-29 because it
should not be present at that pin. A temporary repair procedure is
to place a 1 Micro Farad Electrolytic Capacitor from the
oscillation problem. However, the reset power up will be slowed
fractionally.

8. Dark Video, try replacing U-13.

9. VC2 has good video but no audio.
A: The loader has outdated information.
B: On some types of test software you must have a jumper wire
soldered from the P-1 connection to pin 20 of U-5; on some
types of receivers the P-1 trace also needs to be cut.
C: Is the monthly keys entered in correctly?
D: The screen shows SA but the audio frame counter is rolling 2D,
2E, 2F the monthly keys are not correct or U-24, U-19 may be
defective.
E: Pin 15 of U-4 has a low signal and there is no audio check U-4.
If the audio frame counter is showing 5B replace U-4.
F: Check for a bad connection between pin 39 of U-24 and pin 16 of
U-4.
G: If SA is showing 00 to 02 check inductors L1 & L2. These
inductors can be temporally replaced with 33 to 47 Ohm
resistors. If a buzzing sound shows up in the audio replace the
resistors with the correct inductors.
H: Check U-2 & U-3 short pins 2 & 3 of U-2, if a click is heard in
the speaker then U-2 is good. Audio is obtainable with a bad U-2
but not if U-3 is also bad. If U-3 is defective U-2 can be used
in its' place. However you will only have Mono sound and not
stereo.

10. If the VC2 video signal light does not go off when switching from
a scrambled to a non-scrambled transponder check U-24.

11. If the VC2 signal detect light briefly flashes when powered up but
does not come back on, check pin 10 on U-26 for composite video. IF
U-26 pin 10 looks ok then check for a constant reset signal at pin
14. If no signal is present replace U-29. A simulated reset can be
made by shorting pins 13 & 14 of U-29, if the board comes up then
U-29 is defective.

12. If there is a partial sign wave at the AGC test point (behind the
battery) check the connection between pin 21 of U-24 and the
cathode (BANDED END) of CR12. Check CR12 or transistor Q7.

13. If the VC2 has good video and audio but the graphics box shows up
on the screen with no letters inside, also tearing of graphics box
replace U-8.

14. Another possible cause if the audio is good, and video and graphics
is tearing check L3, Q2 & Q3.

15. If the frame counter is advancing slowly and CR8 checks good, the
AGC test point shows a negative voltage at maximum. Check the
voltage at pin 10 of U-26, there should be 2 to 2« volt peak to
peak video. If it is not present replace U-16.

16. If the unit continues to generate a power reset (VC2 light is
flashing rapidly, or on constantly with no picture or graphics)
check handshake lines between pin 10 U-19 to pin 31 U-7. Also check
pin 3 of U-19 to pin 7 of U-7. If a scope is available check for
data activity. If no scope is available check for continuity with
an Ohm Meeter.

17. Also check the reset line from U-29-8 to U-20-18. If this line is
oscillating U-29 may be bad. Try cutting the U-29-8 trace at the
back side of the board on U-20, cutting the U-20-18 trace and
connecting them with a jumper wire from U-29-8 to U-20-18.

18. If the audio is good and there is no program video check U-13. Jump
pin 1 to pin 4 of U-13, If video returns replace U-13.

19. If the program video jumps check U-13. This can be tested by
installing a jumper wire from pin 1 to pin 4 of U-13.

20. If the VC2 detect light flickers after power up it means that pin
14 of U-29 is sending out a reset signal. Check pin 8 of U-29, if
it is not going low U-29 may be defective. Also check Q6, Q8, and
pin 6 of U-29 for activity on power up.

21. If there is a fluctuating DC level at the AGC test point this may
be caused by a circuit design flaw jumper R62. Change the value of
C45 to a .00027 MFD.Capacitor. The present cap is a .01 MFD

22. If the VC2 signal detect light drops in and out this has several
causes.

A: Pin 21 of U-24 output signal not TTL level, all other signals
looks good cut pin 21 trace (it goes to the cathode of CR12). Cut
trace at pin 9 of U-9 and connect a jumper wire pin 8 of U-9 to pin
21 of U-24. Run a jumper wire from pin 8 of U-9 to the cathode of
CR12. NB. You will only loose aux clock output.

B: If the AGC voltage is wrong the unit drops out of VC2 lock check
the voltage on pin 3 of U-14. If it is 2 volts then check pin 1 of
U-19 it should be 3.5 volts. Pin 2 of U-29 should be 2 volts. Pin
4 of U-29 should be 2 volts. Pin 5 of U-29 should be 4.5 volts. If
these voltages are not correct U-29 may be defective.

C: Check pin 27 of U-30 it should be a solid pull up to 5 volts. If
a scope is available and checks shows noise on this line at high
level, cut pin 27 of U-30 trace on the back side of the board and
solder a pull up resistor (a value between 1K and 10K ohms) from
pin 27 of U-30 to pin 28 of U-30.

23. If U-7 won't clear or load correctly that is, numbers don't come up
right suspect U-11 as being defective.

24. Video is good with no audio and board checks out ok; test code is
correct. Check the health byte in U-7. It may possibly be that the
health byte is not FF and needs to be re-set.

25. If there is no data on U-23 or U-27 check pin 1 on both U-23 & U-
27. It should be about 1.5 volts of video. Pin 2 of U-27 should be
about .7 volts. Pin 2 of U-23 should be about 1 volt. If these
voltages are correct suspect U-28 as defective.

26. If pin 3 on U-31 fluctuates in amplitude and the VC2 drops in and
out of lock check Q9 base ground with an ohm meter. It should be
greater than 2K ohms. If the resistance is much less suspect the 1
MFD cap as bad. [ .C* ].

27. If the unit has a difficult time locking on a VC2 signal and pin 10
of U-26 looks good, but amplitude is high. Check pin 2 of U-22
reference and then pin 3 of U-22 video. If these are good then
check pin 6 of U-22. When U-22 is defective just placing a scope
probe on pin 6 will cause the unit to lock up.

28. If the VC2 is having a memory retention problems, first, if voltages are ok, suspect
U-l9. Use a ram reader such as "keys R Us" or the snapshot from magna systems to
check for garbage above location 6700. If garbage is there U-19 is defective.
29. If the screen is grey and washed out, graphics show up ok but
shifted to the left side of the screen and jumping check U-13. It
may be defective.

30. If the power up reset works but the unit doesn't recognize the VC2
signal and the AGC voltage is high, no output on U-14. Check pin 3
of U-14 for +2 volts. Check U-18 Zener Regulator center pin, it
should read 2.5 volts. If 2.5 volts is not present then either the
Zener is bad or capacitor C50 is shorted.

31. If the video is washed out, screen grey and video is present on all
pins of U-8. Check for 12 volts on pin 16 of U-8 and -5 volts on
pin 7 of U-8. If these voltages are missing check resistors R11
(+12) or R21 (-5) lines.

32. If the video is washed out but present in black and white with a
large amount of tearing, pin 10 of U-26 has a square wave form with
some components of video present. Suspect R74 as being open or a
bad connection to pin 10 of U-26 to pin 4 of U-26.

33. If the audio is garbd and inductors L1 & L2 check out ok, suspect
a defective U-2 or U-3. Clip or desolder one end of R2 or R3 feeds.
R2 feeds audio from U-2 to U-1. R3 feeds audio from U-3 to U-1. If
clipping or removing one of these resistors restores clean audio
then you can identify which U-2 or U-3 is the problem.


34. If the VC2 locks up and there is no keyboard response and the unit
flashes a screen full of the same characters suspect U-6 as being
defective.

35. If the VC2 powers up ok the VC2 light flashes, sometimes drops in
and out, Pin 10 of U-26 video is ok but reading a 6 volt DC
reference, if putting a scope probe in pin 6 of U-22 causes the VC2
to lock up. Suspect L4 to be open or bad connections to R59, C43,
or pin 3 of U-21.

36. If the video is washed out and the character generator box
displayed is distorted with no graphics, replacing U-13 and U-8
does not help check C31. Measure the resistance from pin 4 of U-8
to ground; it should be about 7.5 K ohms. If it is much lower
suspect C31 as bad.

37. If the VC2 resets ok, audio and video are ok, frame counter is os
ok, after a short period of time the audio error counter begins to
count up, and audio goes out and frame counter stops after this
occurs frame counter will start up and audio will come up; error
counter will return to 00. This problem is related to the AGC
circuit. The area of interest is U-22 and includes VR1,C46, and
possibly U-17.

38. If the unit fails to reset on power up, continuity checks (U-30, U-
20, U-16, U-19, & U-24) are ok. The oscillator is ok. U-19 has
clock on pin 17. Pin 18 of U-20 has reset low on it. U-19 is
probably bad. If scope is available check for data activity on U-30
or U-19. If none is present U-19 is most likely defective.

39. If there are AGC problems, example: frame counter slow, check Q4
base for .7 volts. CR8 is ok, Q4 emitter voltage is low 1 volt or
less, Q4 and U-17 check out ok. Suspect C46 as being defective.

40. If a minor adjustment of L6 causes a great change at pin 6 of U-32.
Check C85, C86, and CR14 in that order as possible suspects.

41. If the unit has a reset problem on power up and there is a lot of
noise on pin 14 of U-29. The MFD cap C21 on the U-7 reset line is
probably bad. Remove C21 and replace it. The positive side of C21
(+) is connected to pin 14 of U-7.

42. If the character generator, U-6 is displaying a full screen of one
type of characters. Suspect a bad data line between U-1 and U-6.

43. If on VC2 power up the VC2 detect light flashes then goes off, do
not always assume that U-26 is bad. Check the following:

` U-14 PIN 3 2 VOLTS
U-14 PIN 1 ABOUT 5 VOLTS
U-21 PIN 2 ABOUT 1.7 VOLTS
U-22 PIN 2 ABOUT 3.25 VOLTS
U-23 PIN 2 ABOUT 0.975 VOLTS
U-23 PIN 11 ABOUT 0.470 VOLTS
U-27 PIN 2 ABOUT 0.725 VOLTS

If any of these reference voltages is off more then 10%,
investigate the associated chip. An error in these reference
voltages will upset the AGC and or the PAM data line (U-23 & U-27)
circuit. This will give the same indication as a bad U-26.

44. If when installing a U-30 socket the PGM line Pin 27 trace is cut,
a quick fix is to solder a 10K ohm resistor between pin 27 and pin
28 of the socket.

45. If more brightness is needed in the picture solder a 10k ohm pot
across R13 next to U-8, and adjust as necessary.

46. If the unit continues to generate a power up reset. VC2 light
flashing rapidly or constantly on with no picture or graphics.
Check the handshake lines between pin 10 of U-19 to pin 31 of U-7.
Pin 3 of U-19 to pin 7 of U-7. If scope is available check for data
activity. If no scope is available check for continuity with an ohm
meeter. Another cause of this problem is the reset line from pin 8
of U-29 to pin 18 of U-20. If this line is oscillating, the chip
enable line will be in an unknown state. This will cause U-19 to
act up. This oscillation may be the result if a bad U-29, but
usually it is due to epoxy Corruption. This can be remedied by
cutting pin 18 of U-20 trace, removing the epoxy from the back side
of the board on U-20, cutting the U-20 pin trace and installing a
jumper wire from pin 8 of U-29 to pin 18 of U-20.

47. Continuity test table
U-30 PIN 1 & 28 +5
U-30 PIN 2 U-19 PIN 22
3 U-20 PIN 01
4 " 02
5 " 03
6 " 04
7 " 05
8 " 06
9 " 07
10 " 08
11 " 09
12 " 10
13 " 11
14 GROUND
15 U-20 PIN 13
16 " 14
17 " 15
18 " 16
19 " 17
20 1K OHM TO GROUND
21 U-20 19
22 U-15 6
23 U-19 23
24 U-20 22
25 " 23
26 U-19 21
27 100K OHM TO +5V or rn1 pin 4
28 +5V

Troubleshooting - Testing L1 & L2 Inductors
HINT: These components are most commonly damaged from not removing the power (powering down the receiver) to the vcii module before it is removed or inserted back into the receiver.
L1 & L2 will turn brown or black depending on how much current that has flown through the device. Although this component may still be functional you should test the resistance of the component to see if it is truely damaged and needs replacing.
L1 & L2 are 33 uH Inductors, since inductors in most cases are simply a piece of wire wrapped into a coil it is possible to measure the resistance of these components. These components can be tested in the circuit because we are only interested in either a low resistance or a high/infinite resistance. These resistance measurements MUST be taken with THE POWER to the module OFF, or you will damamge your meter.
Using a DDM (Digital Multi Meter) or an analog meter set your meter to the lowest resistance value (analog would be x1) and place your meter leads across the L1 inductor, you should measure around 2.5 - 3.5 ohms, I have found 3.5 to be most common. If you measured a high resistance or your meter has gone 'out of range' then this component is open-circuit and is no longer functional and should be replaced with another 33uH inductor. Do the same procedure when testing L2. These resistance values may not be exactly the same,this is fine, as long as they both measure a low resistance then the components are good.
If you measure one of the inductors and didn't get a high resistance or infinite resistance but one higher than 2.5 - 3.5 ohms such as 50 ohms or high or even in the kohms range then this component is 'partially-open-circuit' and should be replaced as soon as possible.
I have heard in the past people using a temporary fix for these components by using 100 ohm resistors instead, this is NOT recommended, there is a reason for an inductor and that is why it's there, the definition of an inductor is a device that opposes a chance in current! Opposes being the keyword here an inductor will stop the current levels in a circuit from changing whereas a resistor will not! A resistor is a current limiting device only!

Troubleshooting - Testing The CR8 (Optocoupler)

HINT: These components die with age. If you have an older VideoCipher board then there's a good chance this needs replacing or will need replacing in the next while.
CR8 - Is an optocoupler
WHAT IS AN OPTOCOUPLER?
An optocoupler is a device that totally isolates an input circuit and an output circuit. The most common use is protection from high-voltage transients, surge voltage, or low-level noise that could possibly result in an erraneous output or damage the device. Optocouplers also allow interfacing other circuits with different voltage levels.

* Photo Courtesy of BUZZ, thanx man! *
The input circuit of an optocoupler is an LED, the output is a phototransistor as seen above.
When the LED is on there is current flowing through the phototransistor, when the LED is off then no current is flowing through the phototransistor and the component is in it's off state. Optocouplers usuall turn on and off thousands of times per second.
ok enough theory, now lets fix the damn thing
TESTING AN OPTOCOUPLER
In order to test CR-8 you MUST remove the component from the circuit board.
You will need the following to test an optocoupler:
„h A Variable DC power source (A 9 volt battery with a potentiometer will do fine)
„h - 1 Kohm resistor ( This is a current limiting resistor for the internal LED)
„h - 1 Kohm Potentiometer (Not Needed if you have a variable DC power supply)
„h - DMM (Digital Multi-meter)
0. Measure the resistance of your potentiometer and set it to 0 ohms
1. Hook up the circuit as follows:
„h - hook the NEGATIVE terminal of your power supply to the negative terminal of the optocoupler, this would be the side marked LED and a minus (-) sign
„h - hook one of the outside legs of the potentiometer the negative terminal of the battery
„h - hook the other outside leg of the potentiometer to the positive terminal of the battery
„h - wire the center leg of the potentiometer to one side of the 1Kohm resister
„h - the other side of the 1kohm resistor should be conencted to the (+) LED side of the optocoupler
2. Place your ohm meter across the opposite side of the optocoupler, polarity does not matter when measuring resistance
3. Start with the voltage on the wiper (center leg) at 0 volts and slowly increase, watching your ohm meter the higher your voltage gets the the smaller the value of resistance will be:
EG: at 9 volts on the wiper I got a resistance value of about 1.15 kohm's across the optocoupler
!!! WARNING !!! Do not turn your voltage too high as you can cause damage to the CR8
If you vary the voltage and still get infinite ohms or out of range values then your CR8 is defective and should be replaced
* Your resistance value at around 9 volts should be in the kilohms, if higher CR8 is defective or becoming defective and should be replaced *
I have tried this and works like a charm one of my own test circuits to help people with possible CR8 problems hope it makes yer lives easier hehe considering some problems are blamed on CR8 but CR8 is not always the real problem use this method to test for a bad CR8, if this method turns out that the CR8 is good then look elsewhere for the problem.

Troubleshooting - Testing Diodes
Testing diodes is a really simlpe process if you have a good Digital Multi Meter which has the diode test function on it. Here is the procedure for testing diodes, forward-bias & reverse-bias.
- Begin by placing your DMM in the diode test mode
** When looking at a diode for the first time you will see a black line closest to one end of the component, this is to signify that the leg closest to the line is marked as the CATHODE and the leg farthest from the black line is the ANODE, this is important to know when performing the following tests.
> FORWARD-BIAS TESTING A DIODE <
- Place the NEGATIVE lead from the DMM on the CATHODE of the diode
- Place the POSITIVE lead from the DMM on the ANODE of the diode
*** Results *** You Should Now Be Measuring About 0.7 Volts (700mV)
> REVERSE-BIAS TESTING A DIODE <
- Place the NEGATIVE lead from the DMM on the ANODE of the diode
- Place the POSITIVE lead from the DMM on the CATHODE of the diode
*** Results *** You Should Now Be Measuring About 2.60 Volts
> Possible Problems When Measuring <
PROBLEM: When forward-bias testing the diode I measured 2.60 volts, what is wrong? (NOTE: NEGATIVE lead is on the CATHODE and the POSITIVE lead is on the ANODE)
ANSWER: The Diode Is Open Circuit, Replace Component.
PROBLEM: When reverse-bias testing the diode I measured 2.60 volts, what is wrong? (NOTE: NEGATIVE lead is on the ANODE and the POSITIVE lead is on the CATHODE)
ANSWER: The Diode Is Open Circuit, Replace Component.
PROBLEM: When forward & reverse-bias testing the diode I measured 0.00 volts in either direction, what is wrong?
ANSWER: The Diode Is Short Circuit. In Some cases if the diode is building up resistance you will measure below 2.60 volts.
Troubleshooting - Testing Transistors

Pictured above are the 3 main transistor types used on the videocipher circuit board. The MPS2907A & 2N3906 are PNP type transistors and the 2N3904 is an NPN type transistor.
When testing these 2 types of transistors the procedures are the same, just the test lead polarity is reversed.
Below is the test procedure for testing NPN type transistors.
* Place your DMM into the diode test mode, this mode provides sufficient voltage to forward-bias & reverse-bias a transistor junction.
Hold the transistor with the flat portion with the lettering on it facing you.
In order to continue you will need to know the pin out of the 3 transistors, here they are:
MPS2907A 2N3904 2N3906
All 3 transistor types are configured as: Emitter Base Collector
This meaning, the pin farthest to the LEFT is the EMITTER the MIDDLE pin is the BASE and the pin farthest to the right is the COLLECTOR
NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE
PLEASE NOTE, THE FOLLOWING PROCEDURE IS FOR TESTING NPN TRANSISTORS (2N3904), if you are testing PNP transistors all lead's should be reversed when taking measurements
NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE
Now that you know the pin outs let's start testing.
- Place the NEGATIVE lead from your DMM and place it on the EMITTER of the transistor
- Next, place the POSITIVE lead of the DMM on the BASE of the transistor
*** Result *** You Should Be measuring About 0.70 Volts or 700 mV
This is known as forward-bias testing the base & emitter junction of the transistor.
- Next, Reverse the leads by placing the POSITIVE lead from the DMM on the EMITTER now and the NEGATIVE lead from the DMM to the BASE
*** Result *** You Should Be Measuring About 2.60 Volts
This is known as reverse-bias testing the base & emitter junction of the transistor.
Now let's forward bias test the Base & Collector Junction
- Start by placing the POSITIVE lead frmo the DMM on the BASE
- Then place the NEGATIVE lead from the DMM on the COLLECTOR
*** Result *** You Should Be Measuring About 0.7 Volts or 700mV
- Next, Reverse the leads on the transistor as follows:
- Place the NEGATIVE lead from the DMM on the BASE
- Pleace the POSITIVE lead from the DMM on the COLLECTOR
*** Result *** You Should Be Measuring About 2.60 Volts
Here are some faults which may occur and the resulting measurements
NOTE: Your DMM Must ALWAYS Be In The Diode Test Mode When Making These Measurements
*** POSSIBLE FAULTS & RESULTS ***
PROBLEM: When measuring across the BASE & COLLECTOR junction I got about 2.60 volts and not the specified 0.7 volts (700mv), what is wrong? (Note: Positive lead is on base & negative lead is on collector)
ANSWER: The Base & Collector Junction Is OPEN CIRCUIT, Replace Component.
PROBLEM: When reverse-bias testing the BASE & COLLECTOR junction I measured 2.60 volts and not the required 0.7 volts (700mV), what is wrong? (Note: Negative lead is on the BASE and the positive lead is on the COLLECTOR)
ANSWER: The Base & Collector Junction is OPEN CIRCUIT, Replace Component.
PROBLEM: When measuring across the BASE & COLLECTOR I get 0.00 volts, what is wrong? (Note: Negative lead is on COLLECTOR and positive lead is on the BASE)
ANSWER: Reverse the leads as when reverse-bias testing and if this measurement remains the same (0.00 volts) the BASE & COLLECTOR are Short Circuit, Replace Component.

VC2 Parts List

VCII CHIPS

U-1 TL071 OPERATIONAL AMPLIFIER (Texas Instruments)
U-2 & U-3 SOCN 24765-1 LSI DAC (American Monolythics)
U-4 SOCN 24298-1 LSI DEVICE (American Monolythics)
U-5 SOCN 24297-3 LSI DEVICE (National Cash Register)
U-6 MB 88303 NMOS VIDEO GRAPHICS CONTROLLER (Fujitsu)
U-7 TMS 70C40 CMOS MICROPROCESSOR (Texas Instruments)
U-8 CD 4053 CMOS ANALOG MULTIPLEXER/DEMULTIPLEXER
U-9 74LS 125ANTTL TRI STATE QUAD BUFFER
U-10 7406 TTL HEX INVERTER
U-11 74LS374 TTL TRI STATE OCTAL FLIP FLOP
U-12 74LS244 TTL TRI STATE OCTAL LINE DRIVER
U-13 SD 5000 N QUAD DMOS ANALOG SWITCH ARRAY (Siliconix)
U-14 TL 072 DUAL OPERATIONAL AMPLIFIER (Texas Instruments)
U-15 74LS 139TTL EXPANDABLE 2/4 DECODER
U-16 74LS 373TTL TRI STATE OCTAL FLIP FLOP
U-17 TLO 72 DUAL OPERATIONAL AMPLIFIER (Texas Instruments)
U-18 LM 336Z VOLTAGE REFERENCE (Semiconductor)
U-19 TMS 7001 MICROPROCESSOR (Texas Instruments)
U-20 5516 AP LOW POWER 2K-BYTE CMOS STATIC RAM
U-21&U-22 CA 3080 OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (RCA)
U-23 NE 521 DUAL HIGH SPEED COMPARTOR (Signetics)
U-24 SOCN 24296-3 LSI DEVICE (National Cash Register)
U-26 3-2540-5 HIGH PERFORMANCE OPERATIONAL AMPLIFIER (Harris)
U-27 NE 521 DUAL HIGH SPEED COMPARATOR (Signetics)
U-28 74AS 174 TTL HED "D" TYPE FLIP FLOP
U-29 CA 3046 RCA TRANSISTOR ARRAY
U-30 27128 K 16K-BYTE EPROM
U-31 74F86 QUAD TTL EXCLUSIVE OF GATE
U-32 TL 071 OPERATIONAL AMPLIFIER (Texas Instruments)
U-33 4066 CMOS QUAD BILATERAL SWITCH
U-34 74 AS74 TTL DUAL "D" TYPE FLIP FLOP

TRANSISTORS DIODES

Q1 2N 3904 NPN SILICON TRANSISTOR CR1 1N914 SILICONE DIODE
Q2 2N 3904 NPN SILICON TRANSISTOR CR2 1N914 SILICONE DIODE
Q3 2N 3906 PNP SILICON TRANSISTOR CR3 HP 2800435 HIGH SPEED DIODE
Q4 2N 3904 NPN SILICON TRANSISTOR CR4 1N914 SILICONE DIODE
Q5 2N 2907 PNP SILICON TRANSISTOR CR5 1N914 SILICONE DIODE
Q6 2N 2907 PNP SILICON TRANSISTOR CR6 1N914 SILICONE DIODE
Q7 2N 2907 PNP SILICON TRANSISTOR CR7 1N914 SILICONE DIODE
Q8 2N 2907 PNP SILICON TRANSISTOR CR8 LED PHOTO CELL
Q9 2N 3906 PNP SILICON TRANSISTOR CR9 1N914 SILICONE DIODE
CR10 1N914 SILICONE DIODE
CR11 1N914 SILICONE DIODE
CR12 1N914 SILICONE DIODE
CR13 1N914 SILICONE DIODE
CR14 1N914 SILICONE DIODE
CR15 HP 2800435 HIGH SPEED DIODE
CR16 1N914 SILICONE DIODE
CR17 1N914 SILICONE DIODE
CR18 1N914 SILICONE DIODE
CR19 1N914 SILICONE DIODE
CR20 1N914 SILICONE DIODE

CAPACITORS

C1 47UF @ 10V ELECTROLYTIC C2 0.1UF MONOLYTHIC
C3 0.1UF MONOLYTHIC C4 0.1UF MONOLYTHIC
C5 471 MONOLYTHIC C6 682 MONOLYTHIC
C7 0.1UF MONOLYTHIC C8 0.1UF MONOLYTHIC
C9 471 MONOLYTHIC C10 682 MONOLYTHIC
C11 0.1UF MONOLYTHIC C12 0.1UF MONOLYTHIC
C13 0.1UF MONOLYTHIC C14 47UF @ 10V ELECTROLYTIC
C15 47UF @ 10V ELECTROLYTIC C16 0.1UF MONOLYTHIC
C17 152 MONOLYTHIC C18 0.1UF MONOLYTHIC
C19 152 MONOLYTHIC C20 0.1UF MONOLYTHIC
C21 1UF @ 35V TANTALUM C22 0.1UF MONOLYTHIC
C23 47UF @ 10V ELECTROLYTIC C24 0.1UF MONOLYTHIC
C25 0.1UF MONOLYTHIC C26 NOT USED
C27 680 MONOLYTHIC C28 0.1UF MONOLYTHIC
C29 0.1UF MONOLYTHIC C30 0.1UF MONOLYTHIC
C31 470 MONOLYTHIC C32 100 MONOLYTHIC
C33 0.1UF MONOLYTHIC C34 101 MONOLYTHIC
C35 0.1UF MONOLYTHIC C36 0.1UF MONOLYTHIC
C37 101 MONOLYTHIC C38 0.1UF MONOLYTHIC
C39 0.1UF MONOLYTHIC C40 0.1UF MONOLYTHIC
C41 0.1UF MONOLYTHIC C42 0.1UF MONOLYTHIC
C43 100 MONOLYTHIC C44 680 MONOLYTHIC
C45 0.01 FILM C46 0.027 FILM
C47 0.1UF MONOLYTHIC C48 221 MONOLYTHIC
C49 0.1UF MONOLYTHIC C50 0.1UF MONOLYTHIC
C51 0.1UF MONOLYTHIC C52 0.1UF MONOLYTHIC
C53 272 MONOLYTHIC C54 0.1UF MONOLYTHIC
C55 0.1UF MONOLYTHIC C56 0.01UF MONOLYTHIC
C57 0.1UF MONOLYTHIC C58 0.1UF MONOLYTHIC
C59 221 MONOLYTHIC C60 101 MONOLYTHIC
C61 100 MONOLYTHIC C62 0.1UF MONOLYTHIC
C63 0.1UF MONOLYTHIC C64 NOT USED
C65 0.01UF MONOLYTHIC C66 0.1UF MONOLYTHIC
C67 0.1UF MONOLYTHIC C68 0.1UF MONOLYTHIC
C69 0.1UF MONOLYTHIC C70 0.1UF MONOLYTHIC
C71 15UF @ 10V TANTALUM C72 0.1UF MONOLYTHIC
C73 0.1UF MONOLYTHIC C74 0.1UF MONOLYTHIC
C75 22UF @ 25V ELECTROLYTIC C76 22UF @ 25V ELECTROLYTIC
C77 0.1UF MONOLYTHIC C78 0.1UF MONOLYTHIC
C79 0.1UF MONOLYTHIC C80 0.1UF MONOLYTHIC
C81 0.0082 FILM C82 0.0082 FILM
C83 0.00 LUF MONOLYTHIC C84 0.001UF MONOLYTHIC
C85 100 MONOLYTHIC C86 101 MONOLYTHIC
C87 471 MONOLYTHIC C88 680 MONOLYTHIC
C89 0.1UF MONOLYTHIC C90 0.001UF MONOLYTHIC

RESISTORS

R1 4990 1% R2 10,000 1%
R3 10,000 1% R4 7150 1%
R5 23,200 1% R6 7150 1%
R7 23,200 1% R8 10,000 1%
R9 10,000 1% R10 330 5%
R11 820 5% R12 357.0 1%
R13 1130 1% R14 3K 5%
R15 1K 5% R16 1.8 5%
R17 510 5% R18 100K 5%
R19 1K 5% R20 7500 1%
R21 1K 5% R22 2.7K 5%
R23 TRIMPOT 2K-OHM R24 NOT USED
R25 NOT USED R26 10K 5%
R27 NOT USED R28 TRIMPOT 10K-OHM
R29 NOT USED R30 2.8K 5%
R31 6490 1% R32 1620 1%
R33 15K 5% R34 100K 5%
R35 470 5% R36 470 5%
R37 2K 5% R38 2K 5%
R39 220 5% R40 1000 1%
R41 1000 1% R42 1000 1%
R43 15,000 1% R44 16,200 1%
R45 10,200 1% R46 680 5%
R47 1K 5% R48 150 5%
R49 3K 5% R50 100 5%
R51 NOT USED R52 100K 5%
R53 15K 5% R54 2K 5%
R55 10,000 1% R56 TRIMPOT 200-OHM
R57 220 5% R58 2.2K 5%
R59 2.7K 5% R60 5.1K 5%
R61 1K 5% R62 10 MEG 5%
R63 1K 5% R64 NOT USED
R65 2000 1% R66 1540 5%
R67 100 5% R68 510 5%
R69 470 5% R70 1K 5%
R71 150 5% R72 2.2K 5%
R73 39K 5% R74 2.2K 5%
R75 3240 1% R76 1780 1%
R77 1210 1% R78 3570 1%
R79 4540 1% R80 200.0 1%
R81 2K 5% R82 1K 5%
R83 75.8 1% R84 3K 5%
R85 100 5% R86 10K 5%
R87 470 5% R88 1.5K 5%
R89 10K 5% R90 1.5K 5%
R91 10K 5% R92 47K 5%
R93 75.8 1% R94 2K 5%
R95 2K 5% R96 350 5%
R97 510 5% R98 510 5%
R99 180 5% R100 2050 1%
R101 1130 1% R102 182.0 1%
R103 332.0 1% R104 257.0 1%
R105 1K 5% R106 1K 5%
R107 10K 5% R108 1.5K 5%
R109 10K 5% R110 150K 5%
R111 510 5% R112 510 5%
R113 2K 5% R114 270K 5%
R115 270K 5% R116 100K 5%
R117 75K 5% R118 75K 5%
R119 330 5% R120 330 5%
R121 2K 5% R122 3.9K 5%
R123 1K 5% R124 1K 5%
R125 1K 5% R126 1K 5%
R127 10K 5% R128 68 5%
R129 6190 1% R130 1000 1%
R131 75K 5% R132 10K 5%
R133 NOT USED R134 1K 5%
R135 NOT USED R136 NOT USED