Philips MCM8/21 Service Manual page 36

9-1
ETF8 TAPE MODULE
TABLE OF CONTENTS
Connector assignment ........................................................ 9-1
Tape Module Wiring ............................................................. 9-2
Tape Mechanism electronics ............................................... 9-2
Tape adjustment / Check Table ........................................... 9-3
HEF4094BT Functional Block & Application Logic Table ... 9-3
ETF8 Board layouts - Components & Chips ....................... 9-4
ETF8 Circuit diagram .......................................................... 9-5
Exploded Views & mechanical parts list ............................. 9-6
Electrical parts list ............................................................... 9-8
CONNECTORS ASSIGNMENTS:
CONNECTOR 1701 INTERCONNECTION TO AF BOARD
1 REC-L Record input left
2 REC-R Record input right
3 GND A AF Ground
4 TAPE-L Playback output left
5 +12V D.C. supply (+12V) for AF electronics
6 TAPE-R Playback output right
7 -CMOS Negative d.c. supply (-9V) for controlling JFET J111
CONNECTOR 1703 INTERCONNECTION TO AF BOARD
1 GND M Motor Ground
2 +MOTOR D.C. supply (+12V) for tape deck motor & solenoid
CONNECTOR 1706 INTERCONNECTION TO FRONT BOARD
1 CR_IN Deck sensing Chrome Tape
2 AD1 Deck sensing switches output voltage / Deck EOT
3 +5V DC supply (+5V) for deck status ADC network (ref to microprocessor's supply)
4 GND _P Control & Oscillator Ground
5 CLK HEF4094BT shift register Clock line
6 DATA HEF4094BT shift register Data line
7 STROBE HEF4094BT shift register Strobe line
CONNECTOR 1710 TAPE HEAD CONNECTIONS
1 GND A Erase Head ground
2 ERASE HEAD Erase Head
3 R/P HD Rch R/P Head right channel positive
4 Common Pb Head return ground shield
5 R/P HD Lch R/P Head left channel positive
CONNECTOR 1760 DECK CONTROL INTERFACE
1 Vcc 12V Deck / Motor supply
2 PHOTO Photo sensor output (tape movement indication)
3 GND_M Deck / Motor ground
4 MODE Mode switch (head engagement)
5 Sol_supply Solenoid supply
6 CR_IN Chrome tape detection switch
7 REC FWD Record tab protection status switch (forward)
8 REC REW Record tab protection status switch (reverse)
9-1