Sharp MD X5 Service Manual download pdf (Page 14)

MD-X5H/CP-X5H

– 14 –

ADJUSTMENT

fL: Low-range frequency

fH: High-renge frequency

• AM IF/RF

Figure 14-1 AM IF

TUNER SECTION

• Setting the Test Mode

Holding down the PRE-EQ button and TUNER(BAND) button,

press the POWER button. Frequency is set in the memory as

shown in Table 19. Call it with the PRESET button for tuner

circuit adjustment and check.

Preset No.

Frequency

P01 87.5 MHz P06 522 kHz

P02 108.0 MHz P07 1,620 kHz

P03 90.0 MHz P08 603 kHz

P04 106.0 MHz P09 1,404 kHz

P05 98.0 MHz P10 990 kHz

Figure 14-3 ADJUSTMENT POINTS

Adjusting item

Adjusting object

Adjusting

method

IF T351 Indication of IF waveform 450

set must be 1,620 kHz. kHz is set to max.

Frequency cover fL: T302 (522 kHz) fL: 1.1 ± 0.1 V

(Voltage of Pin 20 Set Diplay of 522 kHz. fH: 5.1 ± 1.3 V of

IC302 VT line) (Only check)

Tracking fL: T302 (990 kHz) Set output of

speaker terminal

to maximum.

AM Signal oscillator Frequency 400 Hz, 30% modulation

• FM Mute Level

Adjusting

method

Adjusting

object

Adjusting

method

98.0 MHz 98.0 MHz VR351 Input: SO301

(30 dB) Output: Speaker

Terminal

FM Signal oscillator Frequency 400 Hz, 22.5 kHz

Adjusting object

Preset No. Frequency

Figure 14-2 FM Mute Level

Electric

Voltmeter

GND

AM Loop Antenna

AM signal oscillator

Loop Antenna

UNIT

IF: Speaker Terminal

Frequency cover: IC302 Pin20

Electric

Voltmeter

UNIT

FM signal oscillator

SO301

Speaker

terminal

VR351

T351

AM IF

T302

FM MUTE

LEVEL

FE301

IC302

TRACKING fL

AM BAND

COVERAGE fL

MAIN PWB

ANTENNA

TERMINAL

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