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3-8
Maintenance
longer flowchart details how to troubleshoot a partially functioning module, and how to
verify correct operation.
The quickest way to check the power module is to measure the voltage of the
PON
signal
(J3-2) while connected to the load. If it is +5 Vdc, the module is probably functioning
properly. Just check the +24 Vdc line (J3-3) and the -12 Vdc line (J3-4) to verify proper
operation. If
PON
is low, disconnect J3 and re-check
PON. If
it is now +5 Vdc, there is an
external short on either the +5V line or the + 12V line.
If PON
is still low, refer to the
flowcharts.
The module may be operated with the load removed, thereby making it easy to determine
whether a problem is in the module or in the load. Note that the module may operate
differently when unloaded, due to the current limiting action of R4-U2, and that the supply
voltages may be slightly higher when unloaded.
DC Voltage and Signal Check of Drive Module
1. Input de power should be +5 Vdc ±5% at pin 5 of the de connector (pin 6 is +5V
return), and +24V ± 10% at pin 1 (pin 2 is +24V return).
2. Various detector functions can be checked by observing the de level at the board
connector. Table 3-2 contains a list of these functions and the point to check for the
signal.
Function
Write Protect
Track 0
Index (Single-Sided)
Index (Double-Sided)
Door Closed
Detector Functions
Connector, Pin 2 Wire Color
JS-12
Red
J6-3
Red
J6-5
Black
J6-6
Purple
JS-2
Yellow
3. Certain functions used in the adjustment procedures have built-in test points. These
functions are listed in Table 3-3.
Table
3-3.
Adjustment Test Points
Test
Function
Point
Differentiated Analog
1
Read Data (Differential)
2
Analog Read Data
3
Differential
4
Ground
15
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