Now you must focus on a very important step according to the CCD price : checking the signals applied to this component.

Begin by adjusting the high and low level of the clock applied to the CCD : this can be done through the 4 potentiometers set onto the inferior board. Then assemble the boards, connect them to the PC parallel port with the cable, and power all on. Start PISCO and execute the SET0 command with the console. By measuring the pin 7 voltage you find any value : your mission is to bring it close to +6.0V with the potentiometer P3 of the inferior board. This clock is fH : it performs the charge transfer within the horizontal register.


Part of the layout, showing the potentiometers place.

The potentiometers adjustment is achieved with a watchmaker screwdriver, turning the tiny screw on the side. The whole excursion needs 20 turns to be covered.

Turn the potentiometer P3 once and check the CCD socket pin 7 voltage. If you get closer to +6.0V then turn on in the same direction, else try the other one. Some iterations are often needed. This voltage doesnít need to be accurate to the hundredth of volt : few tenth are quite well. Thatís finished for the fH high level.

Test now the CCD socket pin 8 : this represents the fH low level. Adjust the potentiometer P4 to bring it close to -4.0V.

The aim is now to adjust the level of the vertical transfer clock, namely V1 and V2. The CCD socket pin 22 represents the high level of these clocks : turn the potentiometer P1 to measure +0.5V. When done, check the pins 15, 16, 17, 18, 19, 20, 21 to be equal to this voltage.

The setting of the vertical clocks low level needs to execute the PISCO command SET255. The pins from 15 up to 22 (which are to the same potential) must be tied to Ė8.0V by adjusting the potentiometer P2.

The Reset clock range (pin 5) is set by Zener diodes : it canít be adjusted, but itís good to check it. The command SET0 must produce a voltage about +3V whereas the command SET255 must bring it to about Ė2V.


Measuring the low level of the Reset clock through the socket pin 5. The expected voltage is 2V, but the actual measure belongs to the tolerance.

The following table specifies the range of the high and low levels for each clock, according to Kodak :
 

Clock level
Minimum
Nominal
Maximum
High V1 level 0.0V  +0.5V  +1.0V 
Low V1 level  -8.5V  -8.0V  -7.5V 
High H1/H2 level +4.0V  +6.0V  +8.0V 
Low H1/H2 level  -6.0V  -4.0V  -2.0V 
High R level  +3.0V  +5.0V 
Low R level  -5.0V  -2.0V 

Now we will check the DC voltages applied to the CCD. The first of them is VDD, pin 3 : it is adjustable whether you have chosen the option 1 for supplying the CCD output amplifier. In that case, and if you supply the camera with a +/-18V source, you must adjust the potentiometer P5 on the superior board to have a potential of 15V on pin 3. If you have chosen the option 1 but supply the camera with a +/-15V source, you canít have +15V : turn the potentiometer P5 to have the maximum value (which can range from 12.6V to 12.9V). The CCD will work, but not in nominal conditions.


Having chosen the option 1 for supplying the CCD output amplifier, and working with a +/-15V power supply, the VDD level is +12.8V, a bit few face to the nominal voltage (+15V).

But with the option 2, the VDD level is not adjustable, but should hang around +14.2V with a +/-15V power supply (any other kind of power supply is absolutely forbidden here).

The other CCD continuous voltages must be seriously checked despite they are generated with Zener diodes.
Pin 1 is OG, must be close 3V.
Pin 4 is VDR, must be close to +10V.
Pin 6 is VSS, must be close to +0.7V.
Pin 23 is GUARD, and must be close to +7.0V
Pin 14 is the ground.
Pins 9, 10, 11, 12, 13, 24 are not connected.

The pin 2 is the output video signal. When thereís no CCD, its level is about 0V.


Measuring pin 4 VDR continuous level.

The hereafter table gives the continuous levels recommended by Kodak :
 

Signal
Minimum
Nominal
Maximum
VSUB  0.0V  0.0V  0.0V 
VDD  +14.75V  +15.00V  +15.25V 
VSS  +0.6V  +0.7V  +1,5V 
VDR  +9.75V  +10.00V  +10.25 
OG  +1.0V  +3.0V  +5.0V 
GUARD  +5.0V  +7.0V  +10V 

The next tables sum up the voltages to be measured on the CCD socket after having executed the command SET0 and SET255. The nominal values are given, but also those measured on an manufactured Audine, and then the values given by Kodak not to destroy the CCD.
 

Voltages on the CCD socket when executing SET0.
Pin
Signal
Nominal voltage
Measured voltage
Maxi value not to exceed
Mini value not to exceed
OG  +3.0V  +3.5V  +6V  -1V 
Vout  Video signal  Video signal 
VDD  +15.0V  +14.4V  +16V  -0.5V 
VDR  +10.0V  +10.4V  +16V  -0.5V 
+3.0V  +4.0V  +10V  -10V 
VSS  +0.7V  +0.7V  +16V  -0.5V 
H1  +6.0V  +6.0V  +10V  -10V 
H2  -4.0V  -4.0V  +10V  -10V 
No connected 
10  No connected 
11  No connected 
12  No connected 
13  No connected 
14  VSUB  0V  0V 
15  V1  0.5V  0.5V  +10V  -10V 
16  V1  0.5V  0.5V  +10V  -10V 
17  V2  0.5V  0.5V  +10V  -10V 
18  V2  0.5V  0.5V  +10V  -10V 
19  V2  0.5V  0.5V  +10V  -10V 
20  V2  0.5V  0.5V  +10V  -10V 
21  V1  0.5V  0.5V  +10V  -10V 
22  V1  0.5V  0.5V  +10V  -10V 
23  GUARD  7.0V  7.2V  +16V  -0.5V 
24  No connected

 
Voltages on the CCD socket when executing SET255.
Pin
Signal
Nominal voltage
Measured voltage
Maxi value not to exceed
Mini value not to exceed
OG  +3.0V  +3.5V  +6V  -1V 
Vout  Video signal Video signal
VDD  +15.0V  +14.4V  +16V  -0.5V 
VDR  +10.0V  +10.4V  +16V  -0.5V 
-2.0V  -2.4V  +10V  -10V 
VSS  +0.7V  +0.7V  +16V  -0.5V 
H1  -4.0V  -4.0V  +10V  -10V 
H2  +6.0V  +6.0V  +10V  -10V 
No connected 
10  No connected 
11  No connected 
12  No connected 
13  No connected
14  VSUB  0V  0V 
15  V1  -8.0V  -8.0V  +10V  -10V 
16  V1  -8.0V  -8.0V  +10V  -10V 
17  V2  -8.0V  -8.0V  +10V  -10V 
18  V2  -8.0V  -8.0V  +10V  -10V 
19  V2  -8.0V  -8.0V  +10V  -10V 
20  V2  -8.0V  -8.0V  +10V  -10V 
21  V1  -8.0V  -8.0V  +10V  -10V 
22  V1  -8.0V  -8.0V  +10V  -10V 
23  GUARD  7.0V  7.2V  +16V  -0.5V 
24  No connected 

If you donít have those voltages, the classic reason is having inverted a polarized capacitors (Tantalum drop capacitors). This produces a shortcut and drops the supplies down (regulators Q1 and Q2 might heat strongly : draw your finger near them to check). A wrong Zener diode, or mounting it in the opposite sense produce the same effects.