Internal Modifications - Shure SCM810 User Manual

WARNING : All modifications must be performed by quali-
fied service technicians.
This section describes SCM810 modifications that can be made
using solder "jumpers" on the printed circuit board; the pads
where jumpers may be used are placed close together so that a
single solder drop functions as a jumper. Note too that:
(1) The only printed circuit board legends used for these modifi-
cations are jumpers (X's) and resistors (R's).
(2) Where resistors are to be added, through-holes are present
on the board.
Line-Level Output to Mic-Level Output
Disable Master Level Control
The Master gain control can be disabled so it cannot be tam-
pered with. The table indicates the resistor value to be used for
the desired gain.
Master Section Gain
-6 dB
0
6 dB
Change Limiter Threshold
All three threshold settings (+16, +8 and +4 dBm) can be changed.
To shift the threshold down by 6 dB, resistor R will be 82 kΩ. To
shift the limiter thresholds up by 6 dB, R will be 330 kΩ.
Local Aux Operation
With linked mixers, the Aux input from a modified mixer does not
link.
Direct Out to Post-Fader
A channel's Direct Out phone jacks can be changed from pre- to
post-fader.
Direct Out to Post-Fader Send/Return (Insert)
1
Changes a channel's / inch Direct Out jack to a post-fader in-
4-
sert point. Send is tip of phone jack; return is ring. Insert jacks are
useful for inserting line-level signal processors into a channel.
For instance, a parametric EQ or compressor/limiter can be in-
serted into a channel for additional processing.
Direct Out to Gated Direct Out
This post-fader, post-EQ channel output is gated, but without
NOMA. In this mode, if the Local/Global switch is in "Local", a
manual mix of channel inputs is present at the Line output. The
Off-Attenuation level of the Gated Direct Out signal is infinite.

INTERNAL MODIFICATIONS

Resistance
5.1 kΩ
10 kΩ
20 kΩ
14
(3) For individual channel modifications, the first number of the
reference designation refers to its channel number, i.e., R1027
refers to a Channel 1 resistor, X7216 refers to a Channel 7
jumper, etc. All references to Channels 1 through 8 in the fol-
lowing paragraphs use Channel 1 jumpers and resistors as
reference. Modifications affecting the Master section are pre-
ceded by the number "9" (X901, etc.).
To gain access to the main printed circuit board, remove the 8
Phillips head screws securing the top cover, and remove the top
cover. Most modifications can be made from the top of the main
board.
Procedure: Short jumper X901. Remove resistors R900 and
R909.
Procedure: Remove resistor R9230. Install new resistor at jump-
er X914.
Procedure: Remove resistors R9177 and R9180. Install new re-
sistor R at jumper X907.
Procedure: Remove resistor R9024.
Procedure: Short jumper X106. Remove resistor R1011.
Procedure: Short jumpers X101, X102, X105 and X106. Remove
resistors R1011 and R1020.
Procedure: Short jumpers X104 and X906 (in Master section).
Remove resistor R1011.