Diagnostic Testing and Troubleshooting (2635A) 5A

Display Assembly Troubleshooting.

A2TP4 DTEST*

1

1

0

0

Table 5A-8. Display Initialization (2635A)

A2TP5 LTE*

POWER-UP DISPLAY INITIALIZATION

 

 

1

All Segments OFF

0

All Segments ON (default)

1

Display Test Pattern #1

0

Display Test Pattern #2

 

 

DSCLK

 

 

 

 

 

 

 

 

 

DISTX

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

 

DISRX

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

 

 

CLEAR TO

 

 

 

 

 

 

HOLD OFF

CLEAR TO

 

RECEIVE

 

 

 

 

 

 

 

RECEIVE

 

31.5 ∝s

 

 

 

 

 

 

 

31.5 ∝s

 

 

 

 

 

 

 

 

 

s54f.eps

Figure 5A-9. Display Controller to Microprocessor Signals (2635A)

REVIEW

REM

SCAN

SET

FUNC

 

 

 

 

 

 

 

mV

k Ω

 

 

EXT TR

 

 

 

 

x1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

s51f.eps

 

Figure 5A-10. Display Test Pattern #1 (2635A)

 

 

 

 

 

 

 

 

 

 

 

MAX

 

Mx+B

ALARM

F

 

 

LAST

MIN AUTO

MON

 

 

 

 

 

 

 

°C

°F RO

 

 

 

 

 

 

 

AC DC

LIMIT

HI

OFF PRN CH

 

 

 

 

M

Hz

2

LO

CAL

 

 

 

 

 

 

 

 

 

s52f.eps

Figure 5A-11. Display Test Pattern #2 (2635A)

Note

If the display is operational but has problems whenfront-panel buttons are pressed, proceed directlyto step 9.

1.Check the three power supplies with respect to GND (A2TP3 or A2U1-42) on the Display Assembly.

VCC (A2U1-21) VEE (A2U1-4) VLOAD A2U1-5)

4.75to 5.25V dc -4.75 to -5.25V dc -28.5 to -32.0V dc

5A-25

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Fluke 2625A service manual Display Controller to Microprocessor Signals 2635A, Display Test Pattern #1 2635A
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