Tandon TM100-1 Operating And Service Manual page 43

INTRODUCTION
This section is for the use of the OEM Repair
and Service Departments. It contains the main­
tenance checks and adjustments used during
the normal life of the drive. The purpose of this
section is to outline the steps necessary to verify
the operation of the drive during troubleshoot­
ing, or after replacing a part or assembly.
If a fault is suspected with a drive, following the
checks and adjustments in the order presented
will help to isolate the problem area, and refer
to the proper section of the troubleshooting
guide. However, if a specific check and adjust­
ment is required, the preceding checks do not
necessarily need to be performed.
The values and tolerances stated in the checks
and adjustments are typical values for working
drives. If the values measured are within toler­
ances or close to the limits, the suspected fault
is normally caused by some other problem.
Completing other checks and adjustments may
disclose the actual problem.
Refer to the schematics and assembly drawings
in the appendices and the theory of operation in
Section 4 for circuit descriptions. Test point loca­
tion is illustrated in Figure 5-1.
5.1 VISUAL INSPECTION
Before applying power to the drive, or doing any
checks or adjustments, visually inspect the
drive:
1 . Check for loose or missing hardware.
2 . Ensure the front latch opens and closes.
The head arm raises when the door is
opened.
SECTION 5
MAINTENANCE CHECKS
AND ADJUSTMENTS
3 . Ensure the front panel is secure.
4 . Manually rotate the drive hub. It should
rotate freely.
5 . Ensure the circuit boards are secure.
6 . Ensure the connectors are firmly seated,
and installed correctly.
7 . Check for damaged or missing compo­
nents on the circuit boards.
8 . Ensure that a diskette can be inserted
and removed easily.
5.2 EQUIPMENT REQUIRED
The following equipment is required for checks
and adjustments.
1 . A dual-channel, wideband oscilloscope,
Hewlett Packard Model 1740A or
equivalent.
2 . An exerciser, AVA Model 103C or equiva­
lent, or a software routine capable of
stepping the drive to any track, selecting
the upper or lower head, and writing a
IF, all zeros in FM, or 2F, all ones in FM,
pattern.
3 . A power supply.
4 . A certified alignment diskette, Dysan
Model 224/2A or equivalent.
5 . A certified output diskette, write protect­
ed, Dysan Model 104/2D with tab or
equivalent.
6 . A certified output diskette, nonwrite pro-
tected,
equivalent.
5-1
Dysan M odel 104/2D or