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PROCESSOR TECHNOLOGY CORPORATION
CUTS, COMPUTER USERS TAPE SYSTEM
SECTION II
(~step
21.
Check operation of the regulators.
This check is
made to prevent potential damage to the IC's from incorrect
voltages.
( :../ Using an ohmmeter, make the following measurements:
SUPPLY
MEASUREMENT POINTS
+ 5 V dc
Ground to right-hand lead of U7
Ground to left-hand lead of U7
+12
-12
V dc
Ground to positive (+) lead of C8
Ground to Pin 8 of U6 socket
V dc
Across C21
You should measure some resistance in all three measure-
ments.
Zero resistance indicates a short.
If required,
find and correct the problem before proceeding.
J
( ) Install CUTS in computer.
(The use of a Processor Tech-
nology EXB Extender Board is recommended.)
CAUTION
NEVER INSTALL OR REMOVE CIRCUIT BOARD
WITH POWER ON.
Turn power on and make the following voltage measure-
ments:
MEASUREMENT POINTS
VOLTAGE (±S%)
Ground to Pin 1 of U18 Socket
+ 5
V dc
Ground to Pin 8 of U6 Socket
+12 V dc
. Ground to Pin 2 of U18 Socket
-12 V dc
If any voltage is incorrect, determine and correct the cause
before proceeding.
If voltages are correct, turn power off, remove CUTS from
computer and go on to Step 22.
Step 22.
Install the following IC's in the indicated loca-
tions.
Pay careful attention to the proper orientation.
Continued on Page II-16.
II-IS
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