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Model 100E Instruction Manual
Table 11-3: DC Power Test Point and Wiring Color Code
NAME
DGND
+5V
AGND
+15V
-15V
+12V
+12R
A voltmeter should be used to verify that the DC voltages are correct as listed in Table
11-4. An oscilloscope, in AC mode and with band limiting turned on, can be used to
evaluate if the supplies are excessively noisy (>100 mV peak-to-peak).
Power
Supply
PS1
PS1
PS1
PS1
PS1
PS2
PS2
11.5.5. I
2
C Bus
2
Operation of the I
C bus can be verified by observing the behavior of the LED labeled D1
on the relay board in conjunction with the performance of the front panel display.
Assuming that the DC power supplies are operating properly and the wiring from the
motherboard to the keyboard as well as from the keyboard to the relay board is intact,
2
the I
C bus is operating properly if:
•
D1 on the relay board is flashing or
•
D1 is not flashing but pressing a key on the front panel results in a change to the
display.
If the display is locked up or if the analyzer is not booting up at all, the I
the cause. Contact customer service if you suspect a problem with the I
11.5.6. Keyboard / Display Interface
The front panel keyboard, the display and the keyboard/display circuit board can be
verified by observing the operation of the display when power is applied to the
045150102 Rev XB1
TEST POINT#
1
2
3
4
5
6
7
Table 11-4: DC Power Supply Acceptable Levels
CHECK relay board Test Points
From Test Point
Voltage
Name
+5
DGND
+15
AGND
-15
AGND
AGND
AGND
Chassis
DGND
+12
+12V Ret
DGND
+12V Ret
COLOR
Black
Red
Green
Blue
Yellow
Purple
Orange
12 V return (ground) line
To Test Point
#
Name
1
+5
3
+15
3
-15V
3
DGND
1
Chassis
6
+12V
6
DGND
TROUBLESHOOTING & REPAIR
DEFINITION
Digital ground
Analog ground
Min V
Max V
#
2
+4.80
+5.25
4
+13.5
+16.0
5
-14.0
-16.0
1
-0.05
+0.05
N/A
-0.05
+0.05
7
+11.8
+12.5
1
-0.05
+0.05
2
C bus may be
2
C bus.
211
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