Product Changes; Parts Designations - Shure T1 Service Manual

Replacement Parts and Drawings

Product Changes

Parts Designations

25C1016 (CC)
On the next page, the parts are listed according to the designations
from the pc board and schematic (see Figures 5 and 6, and the schemat-
ic). Parts shown on the circuit diagram and not listed below are available
through electronic-parts distributors.
On the pages following the parts list are the drawings of the printed
circuit boards and the schematics.
This section briefly describes significant changes to the T1.
Limiter Circuitry and "V" and "W" Frequencies: The limiter cir-
cuitry was removed from Group A, B, and C boards (see Figure 3 and
the schematic). The older "A" board with the limiter circuitry (now desig-
nated as the "T" board) handles just the "V" and "W" "traveler" frequen-
cies.
T1 and 1 : The Model
T P
microphone) was replaced by the model T1 (with a Tini
instead of an attached microphone).
Belt Clip: The older metal-plate clip was replaced by a wire-and-
plastic, spring-loaded clip. A new case bottom accommodates the new
clip.
Quad Op Amp: The older part (manufactured by Raytheon) was
replaced; the former value of associated resistor R107 was 100 kΩ.
"F" Assembly: This update added Group T, enlarged the hole for
the antenna bracket, and changed the following parts from the earlier
numbers or values given in parentheses: Q106 and Q107 (183A02)),
R228 (0 Ω), S101 (55A8020), and S102 (55B8020).
The following comments apply to the parts lists and the schematic:
Resistors: All resistors are surface-mount with
tolerance.
Capacitors: Unless otherwise noted, non-polarized capacitors are
surface-mount dielectric types with a 100
NPO
ance, and polarized capacitors are tantalum types.
Temperature-Compensating Capacitors (N750): C214, C224,
C230.
Coils: These parts are rated in microhenries.
21
Shure T1 Body-Pack Transmitters
1 (with a permanently attached lavalier
T P
1
capacity and a 5% toler-
V
Replacement Parts and Drawings
connector
Q-G
/ rating and 1%
W
10