Sony XR-1790 free download

File name XR-1790.pdf

XR-1790 SERVICE MANUAL US Model Canadian Model E Model Model Name Using Similar Mechanism Tape Transport Mechanism Type NEW MG-36SZ9-32 SPECIFICATIONS ­ Continued on next page ­ FM/AM CASSETTE CAR STEREO MICROFILM XR-1790 5-3. SCHEMATIC DIAGRAM ­ MAIN Section (1/2) ­ · See page 16 for Waveform. ­ 19 ­ ­ 20 ­ XR-1790 5-4. SCHEMATIC DIAGRAM ­ MAIN Section (2/2) ­ · See page 25 for IC Block Diagram. (Page 24) ­ 21 ­ ­ 22 ­ XR-1790 5-5. PRINTED WIRING BOARD ­ PANEL Section ­ (Page 17) · Semiconductor Location Ref. No. Location B-9 C-10 C-7 C-6 C-8 B-9 D4 D900 D901 D902 D903 IC900 5-6. SCHEMATIC DIAGRAM ­ PANEL Section ­ · Waveform 2 IC900 #TM (OSC) (Page 22) 2.2 Vp-p 15 µs ­ 23 ­ ­ 24 ­ · IC Block Diagram ­ MAIN Board ­ IC450 LC75372E R10dBOUT RCT2 RT1 RCT1 RT2 R10dBIN RSELO RT3 RIN 33 32 31 30 29 28 27 26 25 24 23 ROUT 34 RVREF RVREF + ­ RVREF + ­ + ­ RVREF 22 R2 21 R1 20 TEST RFIN 35 RFOUT 36 + ­ RVREF RVREF R3 NC RROUT 37 RVREF 38 VREF 39 LVREF 40 LVREF LROUT 41 + ­ LFOUT 42 LFIN 43 LVREF LVREF LOUT 44 + ­ LVREF LVREF 1 2 3 4 5 6 7 8 9 LT2 LT1 L10dBIN LSELO LIN L10dBOUT LCT2 ­ 25 ­ LCT1 LT3 L3 NC + ­ + ­ + ­ + ­ + ­ 19 VSS 18 NC + ­ LATCH RVREF DECODER SHIFT REGISTER CONTROL 17 CL 16 DI 15 CE + ­ + ­ RVREF LVREF LVREF LVREF 14 VDD 13 L1 12 L2 10 11 5-7. IC PIN FUNCTION DESCRIPTION · MAIN BOARD IC1 LC72322N-9400 (SYSTEM CONTROLLER) Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23, 24 25 26 27 28 29 30 31 32 33 34 35 36 to 40 41 42 43 44 Pin Name XIN TEST2 NC AM-SD FM-SD STEREO MOTOR AMP-MUTE2 MW/SW -- BEEP POWER-ON ILL-ON N/R TAPE-IN FF-REW K1 K0 AMP-ON SEEK SEEK LOCAL/DX -- T2 T1 T0 VOL-CE VOL-DI VOL-CL VDD MUTE-REQ BAND-KEY PANEL-IN NC -- MUTE -- AMP-MUTE ANT-REM I/O I I I I I I O O O O O O O I I I I I O O O O O O O O O O O -- I I I I O O O O O System clock input terminal (4.5 MHz) Connected to ground Not used (fixed at "H") AM signal meter voltage detection input from the FM/AM tuner unit (TU100) "H" active FM signal meter voltage detection input from the FM/AM tuner unit (TU100) "H" active Stereo detection signal input from the FM/AM tuner unit (TU100) (Commonly used for stereo display input) FM stereo detection at input of "L" Capstan/reel motor (M901) drive signal output "H": motor on Muting control signal output to the power amplifier (IC500) "L": muting on MW/SW selection signal output terminal "H": MW, "L": SW Not used (fixed at "H") Not used (open) Beep sound signal output terminal "H" active Power on/off control signal output "H": power on Power on/off control signal output for the liquid crystal display driver (IC900), illumination lamp and back light lamp "H": power on Tape direction switch (S901) input terminal "H": forward side, "L": reverse side Tape in detection switch (S903) input terminal "L": tape in FF/REW detection switch (S902) input terminal "L": FF/REW mode Key matrix return signal input terminal Not used (fixed at "L") Key matrix return si