Service Manual

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adjustment items and Rx adjustment items. If LED lights red upon key pressing, the radio switches
to Tx adjustment items. If LED lights green upon key pressing, the radio switches to Rx adjustment
items.
LED glows red for Tx adjustment items.
LED glows green for Rx adjustment items.
Switch among Tx/Rx Adjustment Items
Switch via the channel selector knob.
Tx: CH1-CH14 indicate Tx preset power, Tx low power, Tx medium power, Tx high power, CDCSS
deviation, CTCSS deviation (low), CTCSS deviation (medium), CTCSS deviation (high), VOX 1,
VOX 2, VOX 3, VOX 4, VOX 5 and Tx low voltage threshold respectively.
Note: Tx medium power of TC-610/620 is not required to be adjusted. Please skip this item.
LED glows red for the adjustment items CH1-CH14.
CH15 is invalid and red LED goes out.
Rx: CH1-CH8 indicate SQL ON 1, SQL ON 5, SQL ON 9, SQL OFF 1, SQL OFF 5, SQL OFF 9, Rx
low voltage threshold and Rx bandpass filter respectively.
LED glows green for the adjustment items CH1-CH8.
CH9-CH15 are invalid and green LED goes out.
Wide/Narrow Band Switch in an Adjustment Item
In an adjustment item, hold down the PTT key for 1.5s at least. LED flashes orange, indicating the
long key pressing is valid. Release the key and the radio switches between wide band and narrow
band periodically. After the wide/narrow band switch, the adjustment point is regarded as the first
frequency of the current band by default.
Frequency Switch in a Band of an Adjustment Item
In a band of an adjustment item, short press the PTT key for less than 1.5s. LED flashes green,
indicating the short key pressing is valid. The radio switches frequencies one after another.
Plus-Minus of the Adjustment Value in a Band of an Adjustment Item
In a band of an adjustment item, short press SK1, and the adjustment value increases in step of 1.
Hold down SK1, and the adjustment value increases continuously in step of 1. When the
adjustment value gets to the maximum value allowed by the adjustment item, the adjustment value
will keep the maximum value constant.
In a band of an adjustment item, short press SK2, and the adjustment value decreases in step of 1.