SERVICE INSTRUCTIONS
The SE30 Gated Compressor/Mixer uses components of the highest quality, operating well within their ratings to assure long life and excellent stability. No routine main- tenance is necessary with the exception of battery re- placement.
CAUTION: There are no user serviceable parts within the case of the SE30. Refer servicing to qualified service personnel.
BATTERY REPLACEMENT:
No special tools are required.
1.Turn knob on back of Battery Compartment (24) ¼ turn counterclockwise to OPEN position.
2.Slide compartment rearward out of chassis.
3.Release cover by unscrewing thumbscrew on top of cover.
4.Tilt cover upwards, pivoting at connector end of com- partment, thus exposing batteries.
5.Unsnap the six 9-volt batteries and replace. Remove the 1.5-volt D cell and replace.
Note: The SE30 may be operated in an emergency with only three 9-volt batteries, installed in either the right or left row of battery connectors. The 1.5-volt D cell operates only the auxiliary
light, and may be omitted if this feature is not required.
6. Pivot cover down, align thumbscrew with speednut, and tighten fully. Batteries are now held firmly by pads in cover.
7.Align metal bottom plate of compartment with plastic guides in SE30 chassis and gently slide compartment
fully into chassis.
8. Rotate knob clockwise to LOCK position.
COVER REMOVAL AND REPLACEMENT
Most servicing and calibration can be performed with only the top cover removed. The only tool required is a No. 1 or No. 2 Phillips screwdriver.
1.Turn Power switch (11) OFF and remove ac line cord from AC Power Receptacle (25).
2.Remove the upper of the two Phillips screws on each side of the SE30.
3. Remove the top cover by grasping the upper half of each side and pulling straight up. This exposes the components shown in the top view of Figure 5.
4. End plates may be removed for easier access to side- mounted components by removing the remaining Phil- lips screws on each side of the SE30. The end plates may then be removed by pulling straight up.
5.The bottom cover may be removed either with or with- out removing the end plates as above. Invert the SE30 and unscrew the four bumpers (feet). The bottom cover may then be pulled straight up from the central chassis. The SE30 will operate properly, except for possible increased hum pickup, with both the top and bottom covers removed.
6.Replace the bottom cover by placing the chassis up- side-down and sliding the cover over the chassis, securing it in place with the four bumpers and screws. If the end plates are attached to the cover, position it so that the large holes in the end plates are near the front of the chassis.
7.Replace each end plate, if necessary, by sliding it between the end of the chassis and the inside of the bottom cover, securing it with a Phillips screw. Posi-
tion the large hole near the front of the chassis. The right and left end plates are interchangeable.
8.Replace the top cover by sliding the ends downward, guided by the recesses in the end plates. Secure with the two remaining Phillips screws.
CHASSIS PARTS
Figure 5 illustrates the location of each chassis-mounted component by reference number, corresponding with those in the Schematic Diagrams (Figure 4) and Replacement Parts List (Table 1). Note that all one and two-digit refer- ence numbers denote ‘chassis-mounted components.
The five printed circuit boards are numbered 1 through
5 from left to right, and are easily removable as outlined below. Trimmer potentiometers used during calibration are located on P.C. Boards 2 and 3 and are shown in Figure
5.Complete replacement P.C. Board Assemblies are avail- able. See Replacement Parts List (Table 1), and note that the replacement of certain components and P.C. Boards will necessitate recalibration of the unit.
The color-coded chassis wiring is indicated both in the Schematic Diagrams (Figure 4) and in the P.C. Board Parts Placement Diagrams (Figure 6). Connections associated with each printed circuit board are shown in the Schematic Diagram as follows:
PC. Board 1, Figure 4A; P.C. Board 2 and P.C. Board 3, Figure 4B; P.C. Board 4, Figure 4C; and P.C. Board 5, Figures 4C and 4D. Power supply wiring is shown in Figure 4D.
LAMP REPLACEMENT
The tools required are a No. 1 or No. 2 Phillips screw- driver, and ¼" and 5/16" open-end wrenches.
1.Remove the topcover as described above.
2.To replace the ac operated pilot lamps (PL1 and PL2), remove the hexagonal-head screws mounting
the lampholders to their vertical brackets, using the ¼" open-end wrench.
3. The sockets may now be pulled rearward and rotated up so that the #47 bulbs may be replaced. It is advis- able to replace both of these lamps when one burns out.
4.Replace the sockets in position and secure with the hexagonal head screws. Note that there are two holes in each bracket, the rear hole for the socket tab and the front hole for the screw.
5.To replace the battery operated Aux. Light (PL3), note the position of the socket between the Gated Memory indicator (M2) and the meter (M1). Remove the hex
nut and lockwasher holding the socket to the left meter stud, using the 5/16" open-end wrench.
6. Unscrew the bulb and replace with a #223 lamp, tightening it firmly in the socket.
7. Position the socket bracket over the meter stud, fol- lowed by the lockwasher and the nut, and tighten while holding the socket in proper position.
8. Replace the top cover.
PRINTED CIRCUIT BOARD REMOVAL AND SERVICE
A standard blade screwdriver or similar prying tool and long-nose pliers are the only tools needed, unless sol- dered components are to be replaced. To avoid component and printed circuit board damage, a soldering iron of 40 watts or less is recommended
1.Remove AC line cord and remove top cover as de- scribed above.
2.Each printed circuit board is mounted by four plastic
