Teac MV1421 Service Manual page 65

B. TROUBLE SHOOTING OF PREAMP IN THE RECORD MODE.
IS THE Y-FM SIGNAL FROM PIN
18 OF IY01 FED TO PIN9 OF IY04 ?
IS THE DOWN CONVERTED COLOUR
SIGNAL FROM PIN 14 OF IY01 FED
TO PIN 10 OF IY04 ?
IS ON/OFF 5V SUPPLIED TO PIN
13 OF IY04 AT 5 VOLTS ?
IS REC(H) SUPPLIED TO PIN 11 OF
IY04 AT 5 VOLTS ?
IS TRICK (H) SUPPLIED TO PIN 1
OF IY04 AT ZERO VOLTS ?
IS THE SIGNAL FROM PIN9 AND PIN
10 FED TO PIN 22 (SP MODE) AND
PIN17 (LP MODE) OF IY04 ?
CHANGE DRUM
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK


IY04 : LA70001
CHECK RY48, CCY05
AND PCB PATTERN.
CHECK CCY04 AND
PCB PATTERN.
CHECK ON/OFF 5V
CHECK REC (H)
CHECK TRICK (H)
CHECK IY04.
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