Tektronix 2445, Instruction Manual

Page: 153 / 351

Maintenance— 2445 Service
Table 6-10
Pots and Switches Column
and Row Code Definitions
Row
Column
Definition
Row Column Definition
Code
Code
Code Code
0
0 Trig COUPLING Down
5 0
B SEC/DIV LSB
0
1 Trig COUPLING Up
5
1 B SEC/DIV Bit 2
0
2 Unused
5
2 B SEC/DIV Bit 3
0
3 CH 1 Coupling Down
5 3
B SEC/DIV Bit 4
0
4 CH 1 Coupling Up
5
4 B SEC/DIV MSB
1
0 CH 4 VOLTS/DIV 6 0 CH 1 VERT MODE
1
1 CH 3 VOLTS/DIV
6
1 CH 2 VERT MODE
1
2 Unused
6 2
ADD VERT MODE
1
3 CH 2 Coupling Down
6 3
CH 3 VERT MODE
1
4 CH 2 Coupling Up 6 4 CH 4 VERT MODE
2
0 CH 1 VOLTS/DIV LSB 7 0 Unused
2
1 CH 1 VOLTS/DIV Bit 2 7 1 B ENDS A
2
2 CH 1 VOLTS/DIV Bit 3 7 2 Unused
2
3 CH 1 VOLTS DIV MSB 7 3 CHOP/ALT
2
4 CH 2 INVERT 7 4 BW LIMIT
3
0 CH 2 VOLTS/DIV LSB
8
0 X I0 MAG
3
1 CH 2 VOLTS/DIV Bit 2 8 1 TRACKING/INDEP
3
2 CH 2 VOLTS/DIV Bit 3 8 2 A t
3
3 CH 2 VOLTS/DIV MSB 8 3 AV
3 4 Horiz Display Select 8 4 Trig SLOPE
4 0 A SEC/DIV LSB 9 0 Trig SOURCE Down
4 1 A SEC/DIV Bit 2 9 1 Trig SOURCE Up
4 2 A SEC/DIV Bit 3 9 2 Trig MODE Down
4 3 A SEC/DIV Bit 4 9 3 Trig MODE Up
4 4 A SEC/DIV MSB 9 4 A/B TRIG Select
EAROM EXAMINE (Exerciser 02).
This routine allows the
operator to examine the contents of any or all EAROM loca­
tions. The EAROM has 100 (decimal) locations (63 hexadec­
imal). Addresses above 63 (hex) are not defined. When
entered, the Exerciser displays the contents of EAROM lo­
cation 00 (hex) on the top line of the crt display. Calibration
constants reside between addresses 01 (hex) and 4C (hex)
and each should have odd parity as explained below. The
remaining locations may be of either parity. The readout dis­
play line has the following format:
AA DDDDP
The format is defined as follows:
“AA”
is the eight-bit address in hexadecimal notation.
“DDDD” is the 14-bit word stored at that location (13 bits
of data and one parity bit).
“P” is a parity indicator for the data word: X indicates
even parity; blank is odd parity.
Pushing the MODE switch up or down will increment or
decrement the EAROM address by 16 (10 hex) respectively.
Similarly, pushing the SOURCE switch up or down will in­
crement or decrement the address by 1 respectively.
CYCLE ERROR CLEAR (Exerciser 03).
This routine pro­
vides a way for the operator to clear the cycle-failure data
written to the EAROM when a CYCLE mode failure occurs.
Until the data is cleared, each time the instrument is
powered up, the Diagnostic Monitor is entered and a diago­
nal line is display across the crt.
CYCLE mode, when entered by removing the CAL/NO
CAL jumper (P501), causes the instrument to continuously