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CFS-616S
SERVICE MANUAL
Ver 1.0 1999. 01

E Model

Model Name Using Similar Mechanism Tape Transport Mechanism Type

NEW MF-W616-148

SPECIFICATIONS

RADIO CASSETTE-CORDER
MICROFILM

CFS-616S
6-4. SCHEMATIC DIAGRAM ­ TUNER Section ­
· IC Block Diagram IC1 CXA1238S
FM/AM FE OUT 16 13 14 15 BAND SELECT FM IF IN AM IF IN TUNE IND FM DISCRI

MPX REG

PLL LPF2

FM RF AM RF IN FM RF IN

AM OSC

30

29

28

27 26 25

24

23

22 21

20 19 18

17

FM FRONT-END

AM FRONT-END REGULATOR

VCO

MPX REGULATOR

FM IF/ DISCRI

1/2 COUNTER 1/2 COUNTER

PD1

PD2

AUTO BLEND

TUNING INDICATOR

MONO/STEREO SELECT

MUTING BAND-PASS MUTE

DECORD AMP

RIPPLE FILTER

1 PLL LPF1

2 PILOT DET LPF2

3 PILOT DET LPF2

4 ST IND/VCO CHECK

5 R-CH OUT

6 L-CH OUT

7 VCC

8 RIPPLE FILTER

9 AGC AFC1

10 11 12 AGC AFC2 GND

Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1 /4 W or less unless otherwise specified. ¢ · : internal component. · C : panel designation. · U : B+ Line. · H : adjustment for repair. · Power voltage is dc 9V and fed with regulated dc power supply from battery terminal. · Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : FM ( ) : MW < > : SW · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Signal path. F: FM/SW f: MW · Abbreviation EA: Saudi Arabia model.

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FM GND

FM OSC REG

MUTE

GND

VCO

AFC

AM IF/ DET

CFS-616S
6-6. SCHEMATIC DIAGRAM ­ MAIN Section ­ · See page 31 for IC Block Diagrams.
· Waveforms ­ MAIN Board ­
1 T301 (REC mode) 10V/DIV, 5 µs/DIV

45.2 Vp-p

14.4 µs
2 T301 (REC mode) 1V/DIV, 5 µs/DIV

4.8 Vp-p

14.4 µs

Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1 /4 W or less unless otherwise specified. · C : panel designation. Note: The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. · U : B+ Line. · H : adjustment for repair. · Power voltage is dc 9 V and fed with regulated dc power supply from battery terminal. · Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : TAPE PLAY ( ) : TAPE REC · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. · Circled numbers refer to waveforms. · Signal path. F : TUNER E : TAPE PLAY (DECK A) d : TAPE PLAY (DECK B) G : TAPE REC (DECK B) N : MIC INPUT

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