Tektronix SDA601, Service Manual

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Maintenance
SDA 601 Serial Digital Analyzer 5- 11
3. Disconnect the battery wire connecter from J7. Be sure to pull on the
connector housing, not on the wires. The back cover is now free and may
moved away from the instrument.
4. Replacement is the reverse of removal. DO NOT USE MORE THAN 3
INCH POUNDS OF TORQUE ON THE CASE SCREWS.
Connector Panel.
Follow this procedure to remove and replace the connector
(“rear”) panel of the SDA601:
1. With the back cover off, remove the 6-pin connector from J21 on the
connecter panel board. Again, pull on the connector housing, not on the
wires.
2. Lift the connector panel assembly slightly up and away from the “front”
panel and remove the SMB connectors from J11 and J13. Set the connector
panel assembly aside.
3. Replacement is the reverse of removal. Note that the cable leading from J2
(COMP/TRIG) on the main board attaches to J11, and the cable leading from
J8 (DESERIALIZER) attaches to J13.
Main Board and LCD. The Main board is connected to the LCD board by 14 pins
at header J4, and is connected to the Keypad circuit board by 20 pins at header
J3. Follow this procedure to remove and replace the LCD assembly and Main
circuit board:
1. After removing the back cover and connector panel assembly, grasp the front
half of the case in one hand and, with a pair of needle-nose pliers, gently pull
the J3 header—and the Main circuit board to which it is attached—up and
away from the rest of the instrument. Pull straight up; do NOT twist the
connector housing.
2. When J3 is free of the Keypad board pins, carefully lift the Main board and
LCD assembly away from the display end of the case. Set aside the front half
of the case, with the Keypad board still inside.
3. To separate the Main board and LCD display module, disconnect the LCD
backlight cable from J5, then gently pull the two assemblies apart at J4. The
rubber LCD/board spacers should remain attached to the LCD display.
4. Reverse this procedure to replace the LCD assembly and Main board.