Star Tech Journal

APRIL 1984
26
Manufacts continued from page 20
7. Check the IC-pins listed in Table 1 with
the Data Probe and verify that the cor·
responding 1 or 0 LED on the CAT Box is
lit.
8. Set the R/W MODE switch to (OFF) and
repeat steps 5 through 7 using address
5555 in step 5. See Table 1, page 27.
TROUBLESHOOTING THE
DATA LINES
1. Perform the Preliminary Procedure under
Troubleshooting the Master and Slave
PCB.
2. Connect the Data Probe to the CAT Box.
3. Connect the Data Probe ground clip to a
ground on one of the PCBs under test.
4. Set the CAT Box switches as follows:
a. BYTES
b. PULSE MODE
c. R/W (not)
d. R/W MODE
5. Enter address 0800
1
UNLATCHED
WRITE
(OFF)
with the CAT- Box
keyboard.
6. Press the DATA SET pushbutton.
7. EnterdataAAwlththeCATBoxkeyboard.
8. Setthe R/W (not) MODE switch to PULSE
and then to STATIC.
9. Check the IC-pin listed in Table 2 on page
27 with the Data Probe and verify that the
1 or 0 LED on the CAT Box Is lit.
10. Set the R/W (not) MODE switch to (OFF)
and repeat steps 6 through 9 using data
55 in step 7.
TROUBLESHOOTING THE
WORKING RAM
1. Perform the Preliminary Procedure under
Troubleshooting the Master and Slave
PCB.
2. Set the CAT Box switches as follows:
a. DBUS SOURCE
ADDR
b. BYTES
1024
c. R/W (not) MODE
(OFF)
d. R/W (not)
WRITE
3. Enteraddress0OOO(MasterPCB)or0010
(Slave PCB) with the CAT Box keyboard.
4. Sett he R/W (not) MODE switch to PULSE
and back to (OFF).
5. Set the R/W (not) switch to READ.
6. Setthe R/W (not) MODE switch to PULSE
and back to (OFF).
7. The Working RAM is a 2K x 8 device. To
test the entire device, set the R/W (not)
switch to WRITE and repeat steps 4
through 6.
8. If the CAT Box reads data that does not
match that entered in step 4, the
COMPARE ERROR LED will light. The
CAT Box ADDRESS/SIGNATURE read-
out will indicate the address location of
the error.
TROUBLESHOOTING THE
COMMUNICATION RAM
1. Perform the Preliminary Procedure under
Troubleshooting the Master and Slave
PCB.
2. Connect a jumper between the RES and
GND test points.
3. Set the CAT Box switches as follows:
a. DBUS SOURCE
ADDR
b. BYTES
1024
c. R/W (not)
WRITE
4. Enter address 0800 with the CAT Box
keyboard.
5. Sett he R/W (not) MODE switch to PULSE
and back to (OFF).
6. Set the R/W (not) switch to READ.
7. Setthe R/W(not) MODE switch to PULSE
and back to (OFF).
8. The Communication RAM is a 2K x 8
device. To test the entire device, set the
R/W (not) switch to WRITE and repeat
steps 5 through 7.
9: If the CAT Box reads data that does not
match that entered In step 5, the COM·
PARE ERROR LED will light. The CAT Box
ADDRESS/SIGNATURE readout will
Indicate the address location of the error.
TROUBLESHOOTING WITH
CHECKSUMS
NOTE
This procedure can only be done with those
CAT Boxes equipped with a Checksum switch.
1. Perform the Preliminary Procedure under
Troubleshooting the Master and Slave
PCB.
4. Setthe R/W(not) MODE switch to PULSE
and back to (OFF).
5. Set the R/W (not) switch to READ.
6. Setthe R/W (not) MODE switch to PULSE
and back to (OFF).
7. If the CAT Box reads data that does not
match that entered in step 4, the COM·
PARE ERROR LED will light. Use the
DBUS SOURCE switch to aid in deter·
ining the location of the error.
TROUBLESHOOTING THE
SLAVE DISPLAY RAM
NOTE
The following procedure erases one-half of
the bit map while the other half shows Its data
on the game display. Steps 6 and 9 change the
bit map halves back and forth.
1. Perform the Preliminary Procedure under
Troubleshooting the Master and Slave
PCB.
2. Set the CAT Box switches as follows:
a. DBUS SOURCE
b.BYTES
C. R/W (not)
DATA
1
WRITE
3. Enter address 1200 with the CAT Box
keyboard.
4. Press the DATA SET pushbutton.
5. Enter data 03 with the CAT Box keyboard.
6. Setthe R/W(not) MODEswitchtoPULSE
and back to (OFF).
7. Press the DATA SET pushbutton.
8. Enter data 02 with the CAT Box keyboard.
4. Enter the address given in Table 3 on
page 27 with the CAT Box keyboard.
5. Setthe R/W(not) MODE switch to PULSE
and then back to (OFF).
9. Setthe R/W(not) MODE switch to PULSE
and back to (OFF).
1 0. The game display should be completely
blank. If so, then repeat steps4 through 6
and again verify that the game display is
completely blank. If anything appears on
the game display, then proceed with step
11.
11. Connect the Signature Analysis probes
as follows:
a. START to the VSYNC test point.
b. STOP to the VSYNC test point.
c. CLOCK to pin 8 of IC 6L.
6. Check the CAT Box ADDRESS/SIGNA•
TURE readout for the appropriate
checksum listed In Table 3.
12. Connect the Data Probe to the CAT Box
DATA connector and all probe ground
leads to a Slave PCB ground.
7. Repeat steps 4 through 6 for each address
listed In Table 3.
13. Set the CAT Box Signature Analyzer as
follows:
2. If applicable, remove the jumper between
the RES and GND test points.
3. Set the CAT Box switches as follows:
a.
b.
c.
d.
BYTES
OBUS SOURCE
R/W(not)_
Checksum Switch
1024
DATA
READ
On
TROUBLESHOOTING THE
MASTER DISPLAY RAM
NOTE
The Playfield RAM is part of the Working RAM.
Refer to Troubleshooting the Working RAM to
test the playfield. Only the Motion Object RAM
is tested in the following procedure.
1. Perform the Preliminary Procedure under
Troubleshooting the Master and Slave
PCa
2. Set the CAT Box switches as follows:
a. DBUS SOURCE
ADDR
b.BYTES
256
c. R/W (not)
WRITE
3. Enter address 3000 with the CAT Box
keyboard.
a. START
Positive (up)
b. STOP
Positive (up)
c. CLOCK
Positive (up)
14. Set the TESTER MODE switch to
SIGNATURE.
15. Press the TESTER PRESET pushbutton.
16. Connect the Data Probe to pin 14 of IC 7 A
17. Verify that the CAT Box ADDRESS/
SIGNATURE readout is 0000. If not, there
is an error associated with IC 7 A.
18. Repeat steps 15 through 17 for each of
the remaining RAMs: locations 78 through
7F, BA through BF, 9A through 9F, and
1 0A through 1 OF.