2500_Users_Manual - 第206页
Preven tive Maint enance 5-52 ProMa ster 25 00 U ser Ma nual 2. Check the 8 MHz programming electronics clock frequency by placi ng the g round p robe of you r scop e (or f requenc y count er) on pin 1 (ground) and the i…
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ProMaster 2500 User Manual 5-51
Checking the Reference
Points
The programming electronics (PE) assembly in the ProMaster 2500 has
no service calibration potentiometers that need to be adjusted. The
procedure described below explains how you can confirm the critical
reference levels that must be present for the programming electronics
assembly to run its performance verification and self-test accurately.
If any of the checks described below are outside the specified ranges,
contact Data I/O Customer Support as listed in the Preface.
WARNING:This procedure should be performed only by trained
electronics service personnel. When servicing the
ProMaster 2500, there is significant risk of electric shock
and injury from moving parts (mechanical injury). Do not
attempt this procedure unless you have been trained and
are qualified to do so.
Note: All instruments used for calibrating the ProMaster 2500 must be
maintained under a normal calibration validation cycle.
You will need the following tools and equipment:
• Hex wrench set
• Grounded wrist strap
• Antistatic workstation
• Digital multimeter, accurate to two decimal places
• Oscilloscope or frequency counter
Note: To access the programming electronics, refer to the “Programming
Electronics Assembly Replacement” section in Chapter 7.
Follow the steps below to check the mandatory reference elements used
by the software in the programming electronics assembly during its
performance validation:
1. Locate the 78-pin connector on the mass storage module (MSM)
board (see Figure 5-21). Pins 1 and 78 are located on the lower end of
the connector; pins 39 and 40 are at the high end, near the RS-232C
connectors on the controller/waveform board.
The pins that you will be checking for this procedure are shown in
Figure 5-21 and are listed below:
•Pin 1: Ground
• Pin 24: +15V input supply voltage
• Pin 28: 8 MHz programming electronics clock
• Pin 78: +10V precision reference voltage
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5-52 ProMaster 2500 User Manual
2. Check the 8 MHz programming electronics clock frequency by
placing the ground probe of your scope (or frequency counter) on
pin 1 (ground) and the input probe on pin 28 (see Figure 5-22).
The clock frequency should read between the minimum and
maximum values shown below:
3. Check the +10V precision reference by reading pin 78 (+10V) using
your digital multimeter (see Figure 5-14). The +10V signal should
read between the minimum and maximum values shown below:
Minimum Nominal Maximum
7.999 MHz 8.000 MHz 8.001 MHz
Minimum Nominal Maximum
+9.090V 10.000V 10.010V
Figure 5-21
Position of the 78-pin Connector on the Mass Storage Module
2142-1
WAVEFORM BOARD
78-PIN CONNECTOR
MASS STORAGE
MODULE
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ProMaster 2500 User Manual 5-53
4. Check the +15 reference by reading pin 24 (+15V) on the connector
block (see Figure 5-14). The +15V signal should read between the
minimum and maximum values shown below:
This completes the performance verification for the programming
electronics assembly.
If any of the measurements described above are outside the specified
ranges, contact Data I/O Customer Support as listed in the Preface.
Running the Self-test
You cannot access the self-test command from TaskLink’s operator mode.
To perform a self-test you must be in TaskLink’s administrator mode. To
start this self-test, perform the following steps:
1. From the DOS prompt, start TaskLink in administrator mode by
entering
tl a
on your PC keyboard at the DOS prompt. If you are already running
TaskLink, exit TaskLink and restart it in administrator mode.
2. Select
Programmer Interface
from the
Utilities
menu.
3. Check the programming module to verify that no device is installed.
Figure 5-22
Test Points on the MSM 78-pin
Connector
Minimum Nominal Maximum
+14.25V +15.00V +15.75V
178
3940
PIN 28 (8MHz)
PIN 24 (+15V)
PIN 1 (Ground)PIN 78 (+10V)
PIN 72 (Plugged)
2143-1