• Contents General2 Brief Introduction.3 Software Description.5 Circuit Description.9 CPU Pins13 TC-500(U) Part List 1.15 TC-500(V) Part List 1.27 Adjustment Description.39 Disassembly and Assembly.43 Exploded View.46 Part List 2.47 Packing.48 PC Board View.49 Block Diagram.53 Schematic Diagram.54 Specifications56 - 1. • TC-500 Service Manual General Manual Scope This manual is intended for use by experienced technicians familiar with similar types of communication equipment. It contains all service information required for the equipment and is current as of the publication date. User Safety Information The following precautions are recommended for personnel safety: DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated.

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HYT TC-268S/TC-368S wireless. You can start with 25KHz channel interval set by the programming software conversion to 12.5KHz channel spacing, thus you do not have.

• TC-500 Service Manual Brief Introduction Antenna LED indicator The light will glow red during transmission. The light will glow green during receiving. During transmission, the light flashes red when the battery voltage is low.

Channel selector knob Turn the channel selector knob to select from channels 1-16 (Channel 16 can be programmed by your dealer as scan function). • TC-500 Service Manual 8. External jack Remove the jack cover and insert an earphone; or insert programming cable into the jack to programme the radio via programming software. Belt clip Used to clip radio on your belt. • TC-500 Service Manual Software Specification Radio Feature Description 1. Use channel selector knob to choose from 15+1(Scan) channels 2.

CTCSS/CDCSS Non-standard Model (Other): 38+83 groups 4. Channel Spacing 12.5KHz/25KHz Narrow/wide Optional 5. Channel Scan (Priority channel and scan revert channel available) 6.

• TC-500 Service Manual (1) Short out the two SELF points on PCB; (2) Turn on the power and turn the channel selector knob to the position 7; (3) Press PTT key while holding down MONI key; (4) After data reset, turn off the power, disconnect the two SELF points and restart the power to use the radio. Remarks: The old data (frequency, CTCSS/CDCSS, channel function settings) will be changed once the model is set, and part of functions will also be changed. • TC-500 Service Manual Squelch level 3 CTCSS deviation (wide) CDCSS deviation (wide) CTCSS deviation (narrow) CDCSS deviation (narrow) CH13-CH16 are used to adjust transmitter and receiver. Press PTT to transmit; release to receive.

CH13-CH16 are defined as follows: (13) Center frequency (difference between transmit and receive frequency is 0.1MHz) (14) Lowest frequency (difference between transmit and receive frequency is 0.1MHz) (15) • TC-500 Service Manual Initial data table Model 1CH(Center) 2CH(Low) 3CH(High) 9-16CH Frequency (MHz) IF (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) 150.000~173.995 +21.4 162.000 162.100 150.000 150.100 173.975 173.900 162.500 162.550 162.600 162.550 162.650 136.000~149.995 +21.4 143.000. • TC-500 Service Manual Circuit Description Frequency Configuration The receiver utilizes double conversion superheterodyne. The first IF is 21.4MHz and the second is 455KHz. The first local oscillator signal is supplied from PLL circuit. Frequency needed in the transmitter is supplied from PLL circuit. Figure 1 shows the frequency configuration.

Frequency Range: 400 MHz—420MHz 450 MHz—470MHz 136 MHz—150MHz. • TC-500 Service Manual The First Mixer The signal from RF amplifier is mixed with the first local oscillator signal from PLL frequency synthesizer in the first mixer (Q23) to generate a 21.4MHz first IF signal. The first IF signal is then fed through two monolithic crystal filters (XF1) to remove spurious signals from adjacent channels. • TC-500 Service Manual Receive signaling CTCSS/CDCSS Audio frequencies over 300Hz of the output signal from IC1 is cut off by a low-pass filter.