Service manual

2000 SERIES RECEIVER DECODER MODULE (RDM)
3-22
March 2000
Part No. 001-3139-502
3.13.3 VOTER INTERFACE
RDM Audio Level Adjustment
1. Adjust the RF generator for 100 µV into the
receiver with a 1 kHz tone at ±3 kHz
(1.5 kHz 900 MHz).
2. Connect a balanced AC voltmeter between J205,
pin 2 and J206, pin 2. Connect a 600 ohm termina-
tion to the meter terminals or across J101, pins 5/6.
3. Adjust R271 on the Interface Board for the type of
line.
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
Microwave/T1 (optional)
-28 dBm (31 mV RMS)
FSK Level Adjustment
1. Connect a balanced AC voltmeter between J205,
pin 2 and J206, pin 2. Connect a 600 ohm termina-
tion to the meter terminals or across J101, pins 5/6.
2. Adjust R282 on the Interface Board for the type of
line.
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
Microwave/T1 (optional)
-28 dBm (31 mV RMS)
Revert Audio Adjustment (Local Site Only)
1. Adjust the RF generator for 100 µV into the
receiver with a 1 kHz tone at ±3 kHz
(1.5 kHz 900 MHz).
2. With RVM installed, bring up the channel.
3. Measure and record the level at C704 on the Audio
Revert Board _______ (see Figure 3-33).
4. With RVM removed, bring up the channel.
5. Adjust R702 on the Audio Revert Board for the
same level as recorded in Step 3.
Table 3-3 ALARMS
Display No. Definition
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Test Mode
Not Used
Normal Operation
Revert Operation
Receiving Data
Not Used
Not Used
Receive Synthesizer Out of Lock
High Stability Synth Out of Lock
Data Processor Failure
Not Used
Not Used
Downloading Code
Not Used
Erasing Code
Failure
Figure 3-33 AUDIO REVERT BOARD ALIGNMENT POINTS
12
3
4
5
678
12
3
4
5
678