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SEPDISP71

Modification instructions
for Mercedes SL R230 and SLR McLaren LCD display

WARNING: This process is recommended only to expert and qualified staf

THE FOLLOWING MODIFICATION IS NECESSARY FOR THE CORRECT FUNCTIONING OF SEPDISP71 DISPLAY.

SEPDISP71 CAN REPLACE BOTH SCREENS OF THE INSTRUMENT CLUSTER (see picture 1).

• Replace the display in an ambient temperature of 25 °C.
• After replacing the LCD, switch on the cluster (pin no. 1 negative, pin no. 5 and pin no. 6 positive).

immagine_71--04
Picture 1

To adjust SEPDISP71 screen / screens voltage:

For the left-hand side display, measure the voltage between the points indicated in picture 2; for the right-hand side display measure between those indicated in picture 3.
· If the voltage measured is between 7.25V and 7.35V, no modification is necessary;
· If the voltage detected is instead lower than 7.25V or higher than 7.35V, it is necessary to do the modification described in the following paragraph “EEPROM MODIFICATION

Picture 2
Picture 3

EEPROM MODIFICATION

NOTE: For this modification on the instrument clusters, it is necessary to use an EEPROM programmer.
We recommend our SEP-EECLIP.

First, set the programmer reading in hexadecimal (HEX).
• Desolder and make a backup of the 93C86 EEPROM
(shown in picture 3), which is located inside the metal enclosure on the back of the cluster.
• To reach a voltage close to 7.30V:
– act on 03AE location for the left-hand side display
– act on 03C6 location for the right-hand side display

Please note that increasing or decreasing these locations by 1 HEX unit, the variation will be +/- 0.07V.

If not familiar with hexadecimal calculation, it is possibile to use the calculation tool in the box below, simply typing in the values.

NOTE: For the oflline version download PDF.

Picture 4
SEPDISP71

CALCULATION OF THE NEW VALUES OF THE LOCATIONS

Left-hand side display

Right-hand side display

* How to identify 03AE location and 03C6 location values on the EEPROM programmer

Verification

Once these modifications have been done, measure again the voltage between the points indicated in picture 2 and 3 and check the it actually is between 7.25V and 7.35V, if not, increase or decrease the locations until the value is as close as possible to 7.30V.

EEPROM MODIFICATION

NOTE: For this modification on the instrument clusters, it is necessary to use an EEPROM programmer.
We recommend our SEP-EECLIP.

First, set the programmer reading in hexadecimal (HEX).
• Desolder and make a backup of the 93C86 EEPROM
(shown in picture 3), which is located inside the metal enclosure on the back of the cluster.

Picture 4

• To reach a voltage close to 7.30V:
– act on 03AE location for the left-hand side display
– act on 03C6 location for the right-hand side display

Please note that increasing or decreasing these locations by 1 HEX unit, the variation will be +/- 0.07V.

If not familiar with hexadecimal calculation, it is possibile to use the calculation tool in the box below, simply typing in the values.

SEPDISP71

CALCULATION OF THE NEW VALUES OF THE LOCATIONS

Left-hand side display

Right-hand side display

* How to identify 03AE location and 03C6 location values on the EEPROM programmer

Verification

Once these modifications have been done, measure again the voltage between the points indicated in picture 2 and 3 and check the it actually is between 7.25V and 7.35V, if not, increase or decrease the locations until the value is as close as possible to 7.30V.