Zenith Z-Tac
1. In the first step cut (cut pin number 1,2,9,10,11,12,17,18,19) just the end of the lead of the I.C. so the pin will not go into the socket, just above the bottom of the I.C.. long enough so they can be soldered to, but short enough so they will not touch the socket pins.
2. Solder Pin Number 8 to 9 to 10
3. Solder Pin Number 11 to 12
4. Solder on wires to pins number 1,2 and 18 of the I.C.
5. The I.C. is now ready for installation.
Using a security TORX No. 15 driver bit, open the converter box. Locate the 40 pin chip (221-288 or 221-165). Now locate the prom chip. It is a 16 pin chip normally in a 18 pin socket usually marked IC-14 or IC-604 or IC-6663 on the circuit board, near the 40-pin chip. Unplug it and replace it with the wen chip. Making sure pin one is in the proper socket hole. In most sockets pin 10 and 11 or 9,10,11,12 will hang past the socket, this is normal. Make sure all pins are secure into the socket and that the cut pins do not touch the socket pins.
6. Connect the 3 wires to the 40 pin chip as indicated on the IC drawing.
7. Short Pins 4 to 5 of the 221-288 40-Pin I.C. (MAKE SURE IT IS THE 221-288)
8. Connect up the box. If all channels works properly, you are finished.
9. If the picture is negative or inverted, continue to the next steps.
10. Locate the jumper block or wire jumpers or resistor jumpers near the 221-288 40-pin I.C. (Note the 221-165 does not have jumpers. These jumpers might need to be connected as follows.
11. 1600 series with jumper block
Jumper #1 always open
Jumper #2 open or closed
Jumper #3 open or closed
Jumper #4 always open
12. 1600 series with resistor jumper
R-716 open or closed
R-717 open or closed
R-718 always closed
R-719 always open
13. 1600 series with resistor jumpers
R-613 open or closed
R-614 always closed
R-615 always closed
R-616 open or closed
14. Cut diode CR-29 or CR-602 on all 1600 series
15. ST-1000 Series (Older Units)
Jumper #1 always open
Jumper #2 open or closed
Jumper #3 always closed
Jumper #4 always closed
Jumper #5 open or closed
Jumper #6 always open
Jumper #7 always open
16. Zero Carrier Adjustment on old units. If needed adjust by turning slightly either way until picture unscrambles.<!--[if !vml]--><!--[endif]-->
Attention! ONLY If the model no. is ST1612 , 5612 or 5622, See Below for additional instructions. for all other ST*** models the instructions below are complete.
and other similar Z-Tac models (1622, 5612/22...)
If after installing the test chip and following all other instructions the unit does not authorize, follow the instructions below.
