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Extracted text from Jvc KSFX 922 R Service Manual (Ocr-read)
Page 1
KS-FX922R
1-11
Adjustment method
1.Digital osclloscope(100MHz)
Measuring conditions(Amplifier section)
Power supply voltage
Load impedance
Line out
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(1 V,50 /open terminal).for DOLBY level measurement
For playback frequency measurement
For wow flutter & tape speed measurement
For head azimuth measurement
Cassette type for CTG-N
(mechanism adjustment)
DC14.4V(10.5~16V)
4 (2Speakers connection)
20kTuner section
BAND STEP
FM : 100kHz (Seek), 50kHz (Manual)
AM : 9kHz step
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 SectionPreset Memory Initialization
Preset Memory
Band
M1M2
97.9
216M3
603M4
105.9
999M5
108.0
1404M6
87.5
1620 FM(MHz)
AM(kHz)
Azimuth screw
(Forward side)
Azimuth screw
(Reverse side)Playback headTape speed adjust Capstan motor
Cassette mechanism
(Surface) Test Instruments reqired for adjustment
2.Frequency Counter meter
3.Electric voltmeter
4.Wow & flutter meter
5.Test Tapes
VT724
VT739
VT712
VT703
6.Torque gauge87.5
15389.9
Page 2
KS-FX922R
1-12
1
C401
C402
C403
C404
C405
C406
C407
C408 C409
C410
C411 C412
C413
C414 C415 C416C417
C418
C419
CP401
CP402
CP403 D401
D402
D403
IC401 IC402 Q401 Q402
Q403
R401R402
R403
R404
R405
R406 R407 R408
R409R410
R411 R412 R413
R414
R415R416
R417 R418 R419R420
R421
R422
R423 R424
R425VR402VR401
B403
B415
B413 B407
B416
B406 B414
B405
B412 B404
B410
B402
B408
B401B409 B411
1
11
21
1
171
2 E
1
1
FSMW1101A31TPP
VR402:Rch
(Dolby NR level adj)VR401:Rch
(Dolby NR Frequency response adj)
Arrangment of adjusting
Head amplifier board section (Reverse side)
Information f or using a car audio service jig
1. We're advancing efforts to make our extension cords common for all car audio products.
Please use this type of extension cord as follows.
2. As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the
mechanism assembly after disassembly.
3. Extension cord : EXTKSRT002-18P ( 18 pin extension cord ) For connection between mechanism assembly
and main board assembly.
Check for mechanism driving section such as motor ,etc..
Disassembly method
1. Remove the bottom cover.
2. Remove the front panel assembly.
3. Remove the top cover .
4. Install the front panel.
5. Confirm that current is being carried by connecting
an extension cord jig.
Note
Available to connect to the CP701 connector when in-
stalling the front panel.
Cassette mechanism
Front panel assembly EXTKSRT002-18P Extension cord
Main board
Main board
EXTKSRT002-18P
to Main board to Cassette mechanism
Page 3
KS-FX922R
1-13
Extension cord
The mechanism should be directly connected to the board using the extension wire.
EXT-KSRT002-18P
EXTKSRT002-18P
Cassette mechanism
to Main board to Cassette mechanism
Front panel assembly Main board
Main board
Extension cord
EXTKSRT002-18P
