Yaesu VX-7R, Service Manual

12

Alignment

Test Setup

Set up the test equipment as shown below for transceiv-

er alignment, and apply 8.7 V DC power to the transceiver.
Refer to the drawings for Alignment Points.

Internal System Alignment Routine

This uses a programmed routine in the transceiver

which simplifies many previously complex discrete com-
ponent settings and adjustments with digitally-controlled
settings via front panel buttons and LCD indications.

To begin, set the transceiver to the center of the 50 MHz,

144 MHz, 222 MHz and 430 MHz bands. Next, select the
430 MHz band, then turn the transceiver off.

Now, press and hold in the 

MON/F

,   and 

0

 buttons (at

the same time) while powering the radio on again. The
display will show the first setting. Thereafter, the frequen-
cies used during alignment will automatically be set with-
out action by the technician.

In the alignment process, each adjustment is selected

by rotating the 

DIAL

. Alignment is performed by:

H

Pressing the 

V/M

 button;

H

 Injecting a signal of the required frequency and lev-
el; then

H

Pressing the 

V/M

 button after a level setting or ad-

justment is made. This second pressing of the 

MON/

F

 button stores the entry.

To exit the alignment routine, press the 

HM/RV

 button.

After performing the system alignment in its entirety, in-
dividual settings can be returned to and adjusted should
the need arise.

As each transceiver is individually optimized at the fac-

tory, the precise settings for the transceiver on your bench
may be slightly different.

Main Band Alignment

PLL Reference Frequency (PLL REF)

Press the 

V/M

 button, then transmit and adjust the counter

frequency to 440.000 (±300 Hz) by rotating the 

DIAL

, then

press the 

V/M

 button. Rotate the 

DIAL

 to select the next

setting.

430 MHz band Alignment

Squelch Hysteresis Adjustment

 (

HIS SQL

)

H

 Rotate the 

DIAL

 for minimum squelch hysteresis. Press

the 

V/M

 button, then rotate the 

DIAL

 to select the next

setting.

Squelch Preset Threshold

 (

THLD SQL

) [

86

]

H

 Inject a –15.0 dBµ RF signal (1 kHz tone @ ±3.5 kHz

deviation), then press the 

V/M

 button, then press the

MON/F

 button twice. Press the 

V/M

 button, then rotate

the 

DIAL

 to select the next setting.

Squelch Preset Tight

 (

TIGH SQL

)

H

 Adjust the generator level to –5.0 dBµ, then press the 

V/

M

 button, then press the 

MON/F

 button twice. Press the

V/M

 button, then rotate the 

DIAL

 to select the next set-

ting.

S-Meter S-1 Adjustment

 (

S1 LEVEL

)

H

 Adjust the generator level to –7.0 dBµ (1 kHz tone @

±3.5 kHz deviation), then press the 

V/M

 button, then

press the 

MON/F

 button twice. Press the 

V/M

 button, then

rotate the 

DIAL

 to select the next setting.

S-Meter Full-Scale Adjustment

 (

S9 LEVEL

)

H

 Adjust the generator level to +19 dBµ (1 kHz tone @

±3.5 kHz deviation), then press the 

V/M

 button, then

press the 

MON/F

 button twice. Press the 

V/M

 button, then

rotate the 

DIAL

 to select the next setting.

Wide-FM S-Meter S-1 Adjustment

 (

S1 LEVEL

)

H

 Adjust the generator level to 0 dBµ (1 kHz tone @ ±20

kHz deviation), then press the 

V/M

 button, then press

the 

MON/F

 button twice. Press the 

V/M

 button, then ro-

tate the 

DIAL

 to select the next setting.

Wide-FM S-Meter Full-Scale Adjustment

 (

S9 LEVEL

)

H

 Adjust the generator level to +20 dBµ (1 kHz tone @ ±20

kHz deviation), then press the 

V/M

 button, then press

the 

MON/F

 button twice. Press the 

V/M

 button, then ro-

tate the 

DIAL

 to select the next setting.

The alignment frequency will now be automatically set

to 430.000 MHz.

High TX Power Adjustment

 (

HI POWER

)

H

 Transmit, and adjust the output power level for 5.0 W

(±0.3 W) by rotating the 

DIAL

, then press the 

V/M

 but-

ton. Rotate the 

DIAL

 to select the next setting.

L3 Tx Power Adjustment

 (

L3 POWER

)

H

 Transmit, and adjust the output power level for 2.5 W

(±0.2 W) by rotating the 

DIAL

, then press the 

V/M

 but-

ton. Rotate the 

DIAL

 to select the next setting.

L2 Tx Power Adjustment

 (

L2 POWER

)

H

 Transmit, and adjust the output power level for 1.0 W

(±0.1 W) by rotating the 

DIAL

, then press the 

V/M

 but-

ton. Rotate the 

DIAL

 to select the next setting.