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Figure 1-1. AN/PRR-9(XE-9) block diagram.
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TM-11-5820-549-50-1 Receiving Set Radio AN PRR-9 Radio AN PRR-9 (XE-9) Manual
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Chapter 2. DEPOT TROUBLESHOOTING
TM 11-5820-549-50-1
Integrated Circuit and Electronic Component Assembly Terminal Identification
Circuit board
pad number
Symbol
Pin number
Signal or function
Z1
1
36
Channel frequency input
2
37
Rf amplifier bypass (emitter)
3
38
Rf amplifier B+
4
39
Channel frequency output to tuned circuit
5
40
First mixer bypass
6
24
Channel frequency and local oscillator injection to mixer
7
23
Local oscillator B+
8
25
Local oscillator frequency output
9
26
Local oscillator crystal frequency
10
27
Local oscillator emitter bypass
11
28
First mixer emitter bypass
12
29
10.7 MHz i.f. output to tuned circuit
13
32
First mixer B+
14
GRD
Ground (B-)
Z2
1
21
10.245 MHz crystal frequency
2
22
10.245 MHz oscillator output
3
20
10.7 MHz i.f. input
4
46
10.7 MHz i.f. to tuned circuit
5
49
10.7 MHz plus 10.245 MHz injection to second mixer
6
50
455 kHz i.f. to filter FL1
7
47
B+
8
14
455 kHz amplifier input to first amplifier
9
15
455 kHz i.f. output to C26
10
16
455 kHz amplifier input to second amplifier
11
17
455 kHz i.f. output to C28
12
19
455 kHz amplifier input to third amplifier
13
18
455 kHz i.f. output to C29
14
GRD
Ground (B-)
Z3
1
53
Audio frequency
2
1, 52
150 Hz signal
3
57
455 kHz i.f.
4
58
455 kHz i.f.
5
GRD
Ground (B-)
6
12
455 kHz i.f.
7
13
455 kHz i.f.
Z4
1
5
150 Hz notch filter output
2
GRD
Ground (B-)
3
2
1l50 Hz notch filter input
Z5
1
60
455 kHz i.f. to discriminator
2
54
Limiter B+
3
3
455 kHz i.f. input
4
2
150 Hz squelch tone input
5
54
Squelch B+
6
5
150 Hz squelch tone
7
6
Squelch bypass
8
8
Rectified 150 Hz squelch tone
9
GRD
Ground (B-)
10
10
Audio frequency output
11
54
Audio amplifier (B+)
12
56
Audio. amplifier bypass
13
9
Audio frequency input
14
59
Ground (B-)
1-5

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