Display Checks - Shure T1 Service Manual

Shure T1 Body-Pack Transmitters
2
TP
7
TP

Display Checks

Alignment
RF
Service Procedures
1
TP
3
TP
TP 9 (–)
Limiter components
(not in all units)
6
TP
TP 8 (+)
Side 1
Figure 3. Pcb
1. Connect the 9 Vdc power supply: the green
2. Reduce the power supply voltage to 6 Vdc: the red
glow.
3. Return the power supply voltage to 9 Vdc.
4. Verify that 9 Vdc 〈±0.35 Vdc) is present at
5. Verify that 5 Vdc 〈±0.25 Vdc) is present at
A: Power and Frequency
RF
1. Connect the 50 Ω output cable to the spectrum analyzer. Make
sure S101 is in the "Mute" position.
2. Set the spectrum analyzer as follows:
S
Center Frequency: transmitter's
S
Span: 1
MH
S
Reference Level: +20 dBm
S
Scale: 10 dB/div
3. The output power should measure 15 dBm ( ±2 dBm) taking into
account cable losses. If the power is within specification, skip to
step 6.
4. Adjust C217 for maximum (peak) output power on the spectrum
analyzer.
Note: Once the signal is close to its maximum, setting the spec-
trum analyzer scale (under the amplitude menu) to 2 dB/div may
make fine adjustments easier.
5. Adjust C215 for maximum output power on the spectrum analyz-
er. The output power should measure 15 dBm (±2 dBm) taking
into account cable losses.
12
5 4
TP TP
Test Points
TP 1 Audio In, J104, pin 3, Model T1-P.
2 Audio In, J103, center conductor
TP
1
of / -in. phone jack, Model T1-G.
4
TP 3 Audio
4 Antenna Output
TP
5 Intermediate Output
TP
TP 6 9 Vdc
7 5 Vdc
TP
8 (+) Battery
TP
9 (–) Battery
TP
z
should glow.
LED
should
LED
6.
TP
7.
TP
25C1016 (CC)