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Service Manual UHF5 (806-941MHz) Information

393

Description of Normal Situations:

[1] Voltage of the power supply: about 7.4V.

[2] For low power, APC-OUT: 1.3-1.4V; for high power, APC-OUT: 1.5-1.8V.

[3] For low power, APC-IN: 1.2-1.3V; for high power, APC-IN: 1.5-1.7V.

[4] PS-APC: about 3.3V.

[5] TX5V: about 5V; RT5V: about 5V; PS-TX: about 3.3V.

[6] High power: about 2.5W; low power: about 1.2W.

[7] Start-up voltage of D9002: about 0.7V. The low-pass coil must be soldered appropriately and

remain in good condition. The spring plate for the antenna must well fit the antenna connector.

[8] The match components must not be soldered inappropriately or damaged.

[9] Vdd: about 7.3V; for low power, Vgg: 0.7-0.8V; for high power, Vgg: 0.85-1V.

[10] Vdd: about 7.3V; for low power, Vgg: 1.3-1.4V; for high power, Vgg: 1.5-1.7V.

[11] U107 PIN1: about 1.7V; U107 PIN3: about 3.3V.

[12] For Q9011, Vb: about 0.8V, Vc: about 2.7V; for U1004, Vdd: about 3.3V, Vcont: 0V (during

transmission).

Note

The above check operations should be made under 7.4V voltage.

Hytera PD78XG Service Manual

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