Printed Circuit Board Operation; Introduction; Explanation Of Symbols And Abbreviations; Physical Description Of The Logic Pcba - Tandon TM-100-1 Operating And Service Manual

SECTION Ill
PRINTED CIRCUIT BOARD OPERATION
3.
INTRODUCTION
This section contains the interface description and the mechanical and the electrical adjustments necessary for
the TM-100-1 and -2 Disk Drives, 48 TPI. In addition, Section 3.2 and Section 3.3 contain schematic diagrams of
the Logic Printed Circuit Board Assembly (PCBA) installed in the disk drive. Section 3.4 contains a schematic dia-
gram of the Servo PCBA installed in the disk drive.
3.1 EXPLANATION OF SYMBOLS AND ABBREVIATIONS
Table 3-1 contains a list of all of the symbols and abbreviations found on the schematic diagrams in this section.
In addition, in the functional and circuit descriptions, a specification line "N MOTOR ON" stands for the negative
true motor on signal.
3.2 PHYSICAL DESCRIPTION OF THE LOGIC PCBA
The Logic PCBA is approximately 146 mm (5. 75 inches) long by 146 mm (5. 75 inches) wide. Figure 3-1 contains
an illustration of the placement of test points and connectors.
JJ READ/WRITE
HEAD CDNNECTORS1':,I
I I
I
I I I I
I
I,
L _ _ ) L___J
PS P6
0
TP2
e
TP4
e
TP10 .
0
TP1 • TPJ •
TP12 .
Figure 3-1
Logic PCBA
3-1