Jvc KSFX 922 R Service Manual
This is the 11 pages manual for Jvc KSFX 922 R Service Manual.
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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