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Fluke 2625A, 2635A service manual 5A-28. Failure to Detect Insertion of Memory Card, Battery LED

Models: 2635A 2625A

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Diagnostic Testing and Troubleshooting (2635A) 5A

Memory Card I/F PCA (A6) Troubleshooting.

5A-28. Failure to Detect Insertion of Memory Card

When a Memory Card is inserted into the Memory Card Interface, the card detect signals (CD1 and CD2; A6U1-19 and A6U1-21) are driven low. Verify that the Memory Card Controller detects this and interrupts the Microprocessor (A1U1) by driving the MCINT* signal (A6U1-60) low. Failure to generate the interrupt may be due to problems with the data bus (D8..D15), the address bus (A1..A4), or one of the control signals (XSCLK, XMCARD*, XWRU*, XRDU*, and RESET*). Consult the schematics found in Section 8 of this manual and verify these interconnections. Consider the ribbon cable that connects the Main Assembly (A1) to the Memory Card Interface Assembly (A6) as a possible source of the problem as well. It may be necessary to repeatedly insert and remove the card to observe the behavior of these signals.

5A-29. Failure to Power Card / Illuminate the Busy Led

When a Memory Card is properly inserted and then detected by the Microprocessor (A1U1), the Memory Card should be powered up and the BUSY LED should be illuminated for a short period of time. If the BUSY LED is not visibly illuminated when the card is inserted, verify the following things using a storage oscilloscope. Verify that the gate of transistor A6Q1 is driven low by A6U1-26 (check both ends of resistor A6R13). When the gate of A6Q1 is near 0 volts dc, the drain of transistor (A6Q1-5 through A6Q1-8) should be near 5 volts dc.

Approximately 50 milliseconds after the transistor drain pins (A6Q1-5 through A6Q1-8) go to about 5 volts dc, the BUSY LED should be turned on by A6U1-25 going low to sink current through the LED (A6DS1) and current limiting resistor (A6R10). When the Microprocessor (A1U1) is done accessing data on the memory card, A6U1-25 and A6U1-26 will both go high again to turn off the BUSY LED and the card power supply. If the 50 millisecond delay between the memory card power being turned on and the BUSY LED being turned on may be extended up to a total of 250 milliseconds if the RDY/BSY signal (A6U1-23) is being held low by the memory card.

5A-30. Failure to Illuminate the Battery Led

The yellow BATTERY LED is controlled by a Memory Card Controller output (A6U1- 24). The Microprocessor checks the BVD1 and BVD2 outputs (A6U1-18 and A6U1-20 respectively) from the memory card about 50 milliseconds after it is powered up. The BATTERY LED is turned on by A6U1-24 going low to sink current through the LED (A6DS2) and current limiting resistor (A6R11).

Verify that the BATTERY LED state matches the state of the BVD1 and BVD2 signals as shown in the following table (H = 5 volts dc, L = 0 volts dc).

Battery LED

BVD1

BVD2

Off

H

H

On

H

L

On

L

H

On

L

L

5A-31

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Fluke 2625A 5A-28. Failure to Detect Insertion of Memory Card, 5A-29. Failure to Power Card / Illuminate the Busy Led
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2635A, 2625A specifications

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