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MAINTENANCE
Table 7-10. Microcomputer
Checks
step
1
ItemlComponent
Programming
2
Ullz,
pin 12
3
U112, pin 9
4
J1103
5
U114, pin 9
6
U117, pins 2-9
7
U115, pins 9-18
8
Ullb, pins 9-18
9
UllS, pin 3
10
UlB,
pin 7
11
U118, pin 9
12
Ll118, pin 12
I3
U118, pin 14
14
U118, pin 16
15
UlOl, pin 37
16
LJlOl, pin 34
17
UlOl, pin 38
18
UlOl, pin 4
19
U101, pin 31
20
U127, pin 18
21
LJ127, pins 10.17
22
U102-U105, pins 11.19
step
k
1
2
3
L
T
t
ItemiComponent
Power on
FILTER button
DS201-DS207 pins 11 and
16
DS201-DS207 pins 1, 2,
4.15, 17, 18
S201-S238
Switch matrix columns
Required
Condition
Program 100 samples, 1Ofisec rate,
continuous
trigger.
1OMHz square wave.
5MHz square wave.
1OMHz square wave.
Negative going pulses.
Data bus pulses.
Address bus (AO-A7) pulses.
Address bus (A8-A15) pulses.
800kHz square wave.
Varying positive going pulses.
Varying positive going pulses.
10MHz square wave.
10MHz square wave.
10MHz square wave.
Stays low for 1OOmsec on power up,
then goes high.
1OMHz square wave.
lMHz
square wave.
High logic level.
Varying square wave, approximately
1.4MHz.
5MHz square wave.
Data bus pulses.
Data bus pulses.
Table 7-11. Display
Board Checks
Required
Condition
All LEDs and segments light briefly
upon power up.
Display FILTER 500kHz message.
Sawtooth
waveform.
Variable pulses.
Check for continuity.
lmsec negative going pulse every
40msec.
Remarks
~~ ~~~~ _~~~
~~~~
All voltages referenced to digital
CONUll"~.
1OMHz clock
5MHz clock
Clock output
VMA signal
Check for stuck bit.
Check for stuck bit.
Check for stuck bit.
E clock for peripheral
KS.
Data strobe signal.
Address strobe signal.
CLK signal
CLK signal
RCLK signal
RESET signal
MPU cluck
Enable clock
BERR signal
mACK
signal
IEEE chip clock
Cheek data bus at IEEE chip.
Check data bus 'It RAM ,md 1WM
KS.
Remarks
All voltages referenced to p"wer
line ground.
Display board pmb-
lems could be caused by Ii0 board
defects.
Digit driver pulses.
Segment driver pulses.
Continuity
when button is
pressed.
Keyboard scan pulses (N0TE:
duration
and interval
rn,,y vary
with software revision).
7-31
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