2500_Users_Manual.pdf - 第174页

Preven tive Maint enance 5-20 ProMa ster 25 00 U ser Ma nual • Pin Driver B oard(s) — Internally g enerated supply voltages serve as inputs to the pin dri ver circuits from the wa veform section of the controller/wavefor…

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Preventive Maintenance
ProMaster 2500 User Manual 5-19
Programming
Electronics Boards
and Assemblies
The PE is composed of two main units that are mounted on the underside
of the handler’s main plate at the programming station.
The PE’s major assemblies are described in the following section.
•
Power Supply
—The input AC generates +15V DC that is routed to
the controller/waveform board’s internal power supply circuits.
•
Controller/waveform Board
—Uses +15V (from the power supply) to
generate a precise +10V reference. This reference acts as an input to
12-bit DACs that help generate numerous voltages (+/- 5V DC, +/-
8V DC, +10V REF, +13V DC, -15V DC, +25V DC, and +36V DC) for
use primarily on the pin driver board(s). The center of the controller
circuitry is a 68000 microprocessor that controls system operation
using 64K of Flash EPROM, system RAM, and 8 MB of user RAM.
Two RS-232C ports are located on this board and use the PE’s
SmartPort software feature to toggle the cables DTE and DCE lines
until a connection is established.
The floppy disk controller provides the signal interface between the
main system and the disk drive. A special circuit called the pin
control unit (PCU) acts as a coprocessor that controls read/write and
timing signals to the pin driver boards. A 68-pin and a 50-pin cable
carry control signals and supply voltages from the control unit base
to the pin driver board(s).
•
Mass Storage Module
(MSM) — The internal hard drive. Under the
default configuration for the 2500, algorithm files are automatically
installed on the MSM when you update system software. The MSM is
partitioned into 4 logical drives:
•
User data drives C
and
D:
31MB and 512 maximum files each.
•
System data drives H
and
I
: 7MB and 10MB respectively with 320
maximum files each. Reserved for operating system files.
•
Disk Drive
—Double-sided, quad-density (1.44 MB formatted), 3.5-
inch disk drive reads the PE system disk to load updated commands
into system RAM and the MSM. It can also be used to load data files
into user RAM.
•
Relay Board
—Controls the flow of signals between the controller/
waveform board and the pin driver board(s). Cables from the
controller unit connect to the pin driver head through the relay
board. These signals are routed to the pin driver board(s) and then
through the relay board to the device to be programmed. Relays on
this board are energized to provide hard V
CC
and GND levels to
device pins as required by the programming algorithm.
Preventive Maintenance
5-20 ProMaster 2500 User Manual
•
Pin Driver Board(s)
—Internally generated supply voltages serve as
inputs to the pin driver circuits from the waveform section of the
controller/waveform board. Control signals from the PCU
coprocessor on the controller/waveform board are also received and
used by the pin driver circuitry on the board to shape programming
waveforms. The pin driver controls the signal slew rates, current
source, and voltage levels required to provide precise programming
signals to the device installed in the programming module. These
signals are routed through the relay board to the SPA block and then
to the device.
•
Squirt Pin Assembly (SPA Block)
—This assembly has no active
circuitry but provides the shortest possible signal path between the
signal source and the device installed in the programming module.
•
Programming Modules
—Act as the interface between the device to
be tested/programmed and the PE. Modules are available for 300-
and 600-mil. (0.300-inch and 0.600-inch wide) DIP devices; 20-, 28-,
32-, 44-, 52-, 68-, and 84-pin PLCC devices; and 150-, 300-, 400-, and
500-mil SOIC devices. DIP modules use high quality contact sets to
establish contact with the device pins. PLCC devices are inserted into
a self-funneling programming block to achieve correct alignment.
The PE
Device List
disk (included in each update kit) lists the
supported devices and which programming module to use for a
specific device.
Self-calibration
The PE performs an automatic self-calibration of its supplies each time
the programmer is powered up and the self-test is run. The internal
power supply outputs +15V DC to the waveform section of the
controller/waveform board. This acts as the input to a precision voltage
regulator that outputs a +10V REF supply. This REF supply is used as the
input to digital-to-analog converter (DAC) controlled voltage and current
source circuits on the waveform board. One DAC outputs a comparator
reference (Comp Ref) voltage and the +10V REF supply is used to confirm
that the DAC output is correct.
The Comp Ref voltage is used, in turn, to verify the correct output voltage
levels of other supplies on the board. Additional comparator reference
levels are used on the pin driver board to confirm the output voltages as
they appear at the programming module. Overcurrent detection circuitry
is also tested during self-calibration. Waveform timing is derived from a
crystal-controlled programmable clock, which is driven off the main
system clock.
Programming Devices
The PE responds to computer remote control commands issued by
TaskLink, running on the PC. Data to be programmed into a device is
usually loaded from a master device or from a file. When a master device
is selected, the handler inserts the device into the programming module,
then the PE reads that data through the programming module contacts,
SPA pins, and pin drivers. Device data is stored in user RAM on the
controller/waveform board as an image of the fuses in the device. This
RAM data is preserved until a new device is loaded, RAM is changed by
the user, or the programmer is powered down.
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ProMaster 2500 User Manual 5-21
TaskLink also allows you to download device data from a file on your
PC. TaskLink sends the PE information on the data file format and then
downloads the file. The PE translates the formatting information in the
file, discards all formatting characters and stores the data in RAM. The
PE signals TaskLink when it completes writing the file data into RAM.
TaskLink then sends the “program” command to the PE and the device is
programmed.
Conditions Requiring Corrective Action
To run the diagnostic tests and to make some of the adjustments, you
must operate the 2500 from its front panel in
local
mode. You cannot run
the tests using TaskLink.
To access the front panel from remote mode, press
LOWER CASE
+
L
. To
return to remote mode after completing the diagnostics and adjustments,
press
LOWER CASE
+
R
from the Main Menu.
Device Jams
The optics detect stopped or jammed devices and alert you to the
condition. Some common causes for device jams are listed below.
• The track width is not adjusted correctly for the device in the track.
• A partially full output tube was inserted in the tube holder. TaskLink
assumed the tube was empty and sent too many devices to the tube.
• The number of parts per tube is incorrect.
• The track is dirty so devices cannot travel smoothly.
• A device has bent leads that cause it to become wedged in the narrow
track.
• A device has foreign material (such as residual label adhesive) on the
surface.
• The output track air pressure is set too low for the size of the device.
• The transition height between the output tracks and the tubes is
incorrect. Adjust the output transition height screw (for the affected
track) for the correct tube thickness.
If a jam occurs in the output track and the 2500 stops operating, push the
jammed device with a wood or plastic pointer into the tube. When you
free the device, either the 2500 resumes operation automatically or you
may need to press
START
to continue operation.
If a device does not move easily down the input track due to bent pins or
some other condition, you might have to remove that device from the
input track and resume operation by pressing
START
or by restarting the
Task.
If a device falls off the chuck, replace it, press
START
and follow the
prompts on the 2500’s display. If the system times out, press
STOP
and
then
START
.