Check for correct sync ratio at the PA output. Connect a high
impedance voltmeter to TP-1 on the Main controller 1A3 of the PA
cabinet energized and adjust R-79 for the value in the table below:
Model
TP-1 voltage
HT1, HT2, HT5
1.8 V
HT10, HT15
2.5 V
The display panel should now indicate rated peak of sync power
on the visual meter page.
Now connect the forward cable at J-7 to J-8 and adjust reflected
calibrate control R-74 to the same voltage as above.
When finished, restore cables to their original positions.
5.13.2
HT20, HT30, HT60 Transmitters
For these transmitters, energize one visual PA cabinet at a time,
and apply blanking and sync test signal to the exciter. Be sure no
“SET-UP” is used. Use external metering at the combined port
and adjust the combined average power to the value listed in the
table below:
B/PAL
Model
M/NTSC
B/SECAM
HT20
2.98 kW
2.84 kW
HT30
4.46 kW
4.26 kW
HT60
2.23 kW
2.13 kW
Check for correct sync ratio at the PA output. Connect a high
impedance voltmeter to TP-3 on the slave controller of the PA
cabinet energized and adjust R-60 for 2.5 Volts. The display panel
should now indicate the rated cabinet peak of sync power (10 kW
for HT20, 15 kW for HT30 and HT60) on the appropriate visual
meter page. Connect the forward cable at J-7 to J-8 and adjust
reflected calibrate control R-74 for 2.5 Volts at TP-4.
Restore the cables to the original configuration, then repeat the
procedure for the remaining cabinet(s).
5.13.3
HT45 Transmitters
For 45 kW transmitters, energize one visual PA cabinet at a time.
Apply blanking and sync test signal to the exciter. Be sure no
“SET-UP” is used. Using external metering at the combined port,
adjust the transmitter output power to the values of combined
average power indicated in the correct table below. Use the table that
corresponds to your system (M/NTSC, B/PAL, or B/SECAM).
Check for correct sync ratio at the PA cabinet output.
Connect a high impedance voltmeter to TP-3 on the slave controller
and adjust R-60 for 2.5 Volts. The display panel should indicate 15
kW on the appropriate visual meter page. Connect the forward cable
at J-7 to J-8 and adjust reflect calibrate control R-74 for 2.5 Volts at
TP-4. Restore cables to normal configuration.
Repeat the above procedure for each cabinet.
Combined Average Power Out Versus PA Cabinet Combi-
nations
M/NTSC Systems
Cabinets ON
Average Combined Power Output
A
B
C
15
0
0
2.98
0
15
0
2.98
0
0
15
2.98
15
15
0
11.9
15
0
15
11.9
0
15
15
11.9
15
15
15
26.8
HT30LS/H
T30HS
FORWARD
REFLECTED
VISUAL PA
(INDIVIDUAL CABINETS AS
REQUIRED)
R60 @TP3
(VISUAL PA SLAVE CONTROLLER)
R74 @TP4
(VISUAL PA SLAVE
CONTROLLER)
VISUAL REJECT POWER
R95 @ TP5
MAIN CONTROLLER)
COMBINED VISUAL POWER
R79 @TP1
(MAIN CONTROLLER)
R87 @TP3
MAIN CONTROLLER)
AURAL POWER
R83 @TP2
(MAIN CONTROLLER)
R91 @TP4
(MAIN CONTROLLER)
VISUAL DRIVE POWER
R75 VISUAL DRIVE A @TP5
(AURAL PA SLAVE CONTROLLER)
OR
R76 VISUAL DRIVE B @TP6
(AURAL PA SLAVE CONTROLLER)
AURAL CHAIN POWER
R60 CHAIN A @TP3
(AURAL PA SLAVE CONTROLLER)
R74 CHAIN B @TP4
(AURAL PA SLAVE CONTROLLER)
Table 5-4. Peak Detector Power Calibration
Section V - Maintenace
Rev. B: 1/11/1999
888-2365-001
5-7
WARNING: Disconnect primary power prior to servicing.
Summary of Contents for Platinum Series
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