Step 1. SAFE TO TURN ON CHECK

Figure 5-2. RF Power Amplifier Test Setup.

Figure 5-3. Reference RF Output Test Setup

TM-11-5820-890-30-4 Ground ICOM Radio Sets: Receiver-Transmitter Radio RT-1523(C)/U (NSN 5895-01-234-8093) Manual
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TM 11-5820-890-30-4 5-10. OPERATIONAL CHECK. Continued Step 1. SAFE TO TURN ON CHECK. Action Response a. Read DMM. a. DMM reading is greater than 2 k W. If not, the power amplifier case (6A1) is bad. b. Set RESPONSE: 8. b. DMM reading is greater than 2 k W. If not, Read DMM. the decoder control (6A2) is bad. c. Set RESPONSE: 9. c. DMM reading is greater than 5 k W. If not, Read DMM. go to chart 1. d. Set RESPONSE: 10. d. DMM reading is greater than 50 k W. If not, Read DMM. the decoder control (6A2) is bad. Step 2. RF OUTPUT CHECK. Action Response a. Connect equipment as shown in figure 5-3. a. No response. Set 28 V: ON RF SWITCH: 1 b. Load the following frequencies into b. No response. the RT: CHAN FREQUENCY (kHz) 1 87975 2 55000 3 33000 c. Set RT CHAN: 1. c. No response. d. Press handset PTT switch. Read and d. Recorded DMM reading is RT channel 1 record level shown on DMM. RF power (RT 1). e. Set RT CHAN: 2. e. No response. f. Press handset PTT switch. Read and f. Recorded DMM reading is RT channel 2 record level shown on DMM. RF power (RT 2). g. Set RT CHAN: 3. g. No response. h. Press handset PTT switch. Read and h. Recorded DMM reading is RT channel 3 record level shown on DMM. RF power (RT 3). 5-7

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