JVC KS-FX922R service manual Adjustment method

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Adjustment method

Test Instruments reqired for adjustment

1.Digital osclloscope(100MHz) 2.Frequency Counter meter 3.Electric voltmeter

4.Wow & flutter meter 5.Test Tapes

VT724

for DOLBY level measurement

VT739

For playback frequency measurement

VT712

For wow flutter & tape speed measurement

VT703

For head azimuth measurement

6.Torque gauge

Cassette type for CTG-N

 

 

 

 

(mechanism adjustment)

 

 

 

Measuring conditions(Amplifier section)

 

 

 

Power supply voltage

DC14.4V(10.5~16V)

Load impedance

4 (2Speakers connection)

Line out

 

20k

Standard volume position Balance and Bass,Treble volume .Fader :Center(Indication"0")

Loudness,Dolby NR,Sound,Cruise:Off

Volume position is about 2V at speaker output with following conditions.Playback the test tape VT721.

AM mode 999kHz/62dB,INT/400Hz,30% modulation signal on receiving.

FM mono mode 97.9MHz/66dB,INT/400Hz,22.5kHz deviation pilot off mono.

FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev.

Output level 0dB(1V,50 /open terminal).

KS-FX922R

Tuner section

BAND STEP

FM : 100kHz (Seek), 50kHz (Manual)

AM : 9kHz step

Preset Memory Initialization

Band

 

Preset Memory

 

 

 

 

 

 

 

M1

M2

M3

M4

M5

M6

 

FM(MHz)

87.5

89.9

97.9

105.9108.0

87.5

AM(kHz)

153

216

603

999

1404

1620

DUMMY LOAD

Exclusive dummy load should be used for AM and FM dummy load,there is a loss of 6dB between SSG output and antenna input. The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.

Arrangement of Adjusting

Cassette Mechanism Section

Capstan motor

Tape speed adjust

 

Cassette mechanism (Surface)

Azimuth screw Playback head (Forward side)

Azimuth screw (Reverse side)

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Contents KS-FX922R Adjustment method Arrangment of adjusting Extension cord Conditions Block Diagram Standard schematic diagrams Mecha control circuit section LCD driver & Operation switch circuit section No.49631 Mar KS-FX922R