Service Instructions; Console Service; Replacement Parts; Fuse Replacement - Shure SR101 Series 2 Operation And Service Manual

SR101 Series 2 Audio Console
SERVICE INSTRUCTIONS
W A R N I N G
Voltages in this equipment are hazardous to life. Make
all input and output connections with ac power dis-
connected. Refer servicing to qualified service per-
sonnel.
CONSOLE SERVICE (SEE GUARANTEE, Page 22.) SERVICE ACCESS
The SR101 Audio Console uses components of the high-
To open the Console for servicing, carefully place the
est quality, operating well within their respective ratings
Console front-panel downward on a firm, flat, padded sur-
to assure long life.
face. A rubber, plastic, corrugated cardboard, or cloth pad
should be placed between the work surface and the Con-
sole controls. Remove the three Phillips head screws se-
curing the upper and lower rear panels to each other, the
four Phillips head screws securing the lower rear panel to
the Console sides, and the two Phillips head screws se-
curing the upper rear panel to the Console sides. Open the
two halves to the limit of their hinges (lower half first) to
obtain access to the printed circuit boards (NOTE: Al-
though not normally required for servicing, the lower
REPLACEMENT PARTS
panel may be completely removed from thi Console by
removing two hex-head screws, one at either side of the
Parts that are readily available through local electronic
console
case, and disconnecting the black ground lead.)
parts distributors are not shown on the accompanying
Parts List. Their values are shown on the Circuit Diagram
(Figure 31, Pages 44-45). Commercial parts not readily
available and unique parts are shown on the Parts List
and may be ordered directly from the factory.
The commercial alternates shown on the Parts List are
not necessarily equivalents, but may be used in the event
that direct factory replacements are not immediately avail-
able. To maintain the highest possible performance and
reliability Shure factory replacement parts should be used.
When ordering replacement parts, specify the Shure Re-
placement Kit Number (RKC), description, product model
number, and serial number.
FUSE REPLACEMENT
To replace line fuse F1 (with no apparent problems in
the Console), disconnect the line cord from the ac source
and remove the rear-panel fuseholder cap. Replace the
defective fuse only with a 3AG-3/16A Slo-Blo fuse (SRI 01
only; SR101-2E contains a 0.1A Slo-Blo fuse for 180- to
250-volt operation, or a 0.2A Slo-Blo fuse for 90- to 132-
volt operation).
CAUTION
If trouble symptoms-overheating, erratic operation,
etc.-were apparent before the fuse blew, or if the re-
placement fuse blows, a qualified serviceman should
troubleshoot the Console carefully to find the source
of the trouble. Do not continue to replace fuses
until the trouble has been corrected.
The Console also contains two wired-in fuses, one in
series with rear-panel line fuse F1 (F2, 3/10A, Slo-Blo) and
one in the meter and accessory lamp circuit (F3, I A , Slo-
Blo). If replacement becomes necessary, replace only
with identical fuses.
KNOB REPLACEMENT
All front-panel control knobs are pull-off types and are
interchangeable with others of the same function. The
only exceptions are the channel 7 and 8 INPUT ATTEN
Switches (S7,S8) which contain separate AUX-MIC knobs.
When ordering replacement knobs, be sure to order the
proper color-coded type for the desired control.
LAMP REPLACEMENT
To replace either of the two #47 lamps (PLI,PL2) illumi-
nating the VU Meter (MI), carefully raise the metal clip
assembly holding the lamp to be replaced upward and
off the Power Supply printed circuit board bracket. Lift
the lamp socket upward, taking care not to crimp or
break any associated wiring. Replace the defective lamp
and carefully return the lamp assembly to its original
position.
REVERBERATION ASSEMBLY
To remove the Reverberation Assembly (AlO), first dis-
connect the input, output and ground leads. Remove the
four Phillips head screws securing the assembly to the
lower rear panel and remove the assembly. If the Console
is to b e operated with the Reverb Assembly removed, make
sure the associated wires are not left free to short out any
other wiring. Remove the input and output wires from the
Reverb Spring Amplifier circuit board, and remove the
ground wire from its lug.
BOARD REMOVAL
The various printed circuit boards are mounted in dif-
ferent manners. The following paragraphs describe the
best method of removing these boards after wires and
cable assemblies have been removed. IMPORTANT: When
disconnecting push-on terminals or soldered board con-
nections, make sure each wire is identified for proper re-
connection. This may be done by affixing a piece of mask-
ing tape marked with the connection or terminal letter or
color to each wire.
CAUTION
Push-on terminals must be removed by pulling termi-
nals straight up from printed circuit board surface.
Do not apply side force when removing or recon-
necting terminals, or damage may result.
Refer to Figure 17, Page 19, for location of each board.