5A-31. Failure to Write to Memory Card

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Service Manual

The installed memory card controls the state of the write protect (WP) signal that is an input to the Memory Card Controller (A6U1-22). This signal must be near 0 volts dc when the memory card is powered up and any operation requiring write access to the memory card is done. Verify that the state of the WP signal (A6U1-22) correctly follows the state of the write protect switch on the memory card as indicated in the following table (H = 5 volts dc, L = 0 volts dc).

Write Protect	WP (A6U1-22)
Enabled	L
Disabled	H

If the problem with the interface has not been isolated yet, the problem is probably in the card address (CA<0> .. CA<25>, REG*), card data (CD<0> .. CD<7>), and control signals (CE1*, CRD*, CWR*). The card data (CD<0> .. CD<7>) signals each go through a series termination resistor (Z2) so verify these series resistances. The control signals (CE1*, CRD*, CWR*) each go from the Memory Card Controller (A6U1) through an analog switch (A6U2) as they go to the Memory Card Connector (A6P1), so verify that each control signal functions properly. The card read (CRD*) and card write (CWR*) signals must go low for read and write cycles respectively. The following table describes the memory card access modes to "attribute" memory (only read accesses are done by the instrument).

	Memory Card Access Modes
Transfer Mode	REG*	CE1*	CRD*	CWR*	Data Direction
No Operation	x	H	H	H
Attribute Byte Read	L	L	L	H	CD->D
Common Byte Read	H	L	L	H	CD->D
Common Byte Write	H	L	H	L	D->CD

5A-32. Write/Read Memory Card Test (Destructive)

The instrument has a special computer interface command that may be used gain diagnostic information about what is failing to function correctly in the Memory Card Interface.

Warning

Use of the following command will destroy any data stored on the memory card that is installed in the instrument. After completion of the troubleshooting and repair of the memory card interface, the memory card used must be formatted again before it may be used again for data storage.

To make use of this command, connect a terminal or computer to the RS-232 interface and set the instrument communication parameters as follows:

∙Press SHIFT and then LIST(COMM).

∙With ’BAUd’ displayed, use the UP or DOWN arrow key to select the desired baud rate. Then press ENTER.

∙With ’PAR’ (parity) displayed, use the UP or DOWN arrow key to select the parity. Then press ENTER.

5A-32

2635A, 2625A specifications

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Fluke 2635A, 2625A service manual 5A-31. Failure to Write to Memory Card

Models: 2635A 2625A

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