PRESIDENT HR2600 Service Manual download pdf (Page 27)

Alignment of Receiver Portion

1. Test equiptment required:

AF VTVM DC Power supply (13.8V)

Oscilloscope Dummy Load (50 Ohm)

S.S.G. AM FM (28.000MHz, 1KHz, 30% Mod. and 50 Ohm Impedance)

2. Preperation for Alignment:

NB SW : Off Mode : AM

PA SW : Off Squelch : Min. (Auto SQ Off)

Beep SW : Off RF Gain : MAX

VOLUME : MAX TX SW : Off

RIT : Middle position

3. Alignment Procedure:

Preset to: Adjustment Remarks

1 L101, L104,

L113,

L115, and

L105

Alignment of sensitivity

Adjust coils for maximum reading of the AF VTVM. (During

this step, set the S.S.G.attenuator so that the standard output

is less than 0.5W (2v/8ohm)).

2 VR102 Alignment of Squelch

Set th output of the S.S.G. to 66dB +/- 2dB and squelch to

maximum. Adjust VR102 so that squelch just breaks.

3 VR101 Alignment of S-Meter

Set the output of the S.S.G. to 46dB, no modulation.

Adjust VR101 so that "9" LCD just lights on.

4 Mode : FM

S.S.G. : 1mV

(1.5kHz Dev.)

L401 Adjust L401 for maximum reading on AF VTVM.

5 Mode : AM

Noise GEN.

to the ANT

Jack.

L203 Adjust L203 for minimum reading on the AF VTVM.

(Noise GEN. OUTPUT : 50Hz SQ Wave 2Vp-p)

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PRESIDENT HR2600 Service Manual Page 27