Sharp SC-103H Service Manual page 35

TROUBLE SHOOTING OF AMPLIFIER (3)
OUTSIDE SPEAKER TERMI-
NAL CONTACT IS NOT
NORMAL
Se
SPEAKER WIRING IS NOT
NORMAL OR SPEAKER IS
DEFECTIVE
CHECK POWER SOURCE CIR-
CUIT AND MOTOR. REPAIR
OR CHANGE
HEAD WIRING OR HEAD IS CHECK AND REPAIR OR
DEFECTIVE CHANGE
CHECK AND REPAIR OR
CHANGE
MOTOR DOES NOT REVOLVE
MOTOR REVOLVES
TAPE ISNOT PLAYED AT ALL
CHECK AND REPAIR OR
CHANGE
CHECK AND REPAIR OR
CHANGE
CHECK AND REPAIR OR
CHANGE
CLICK REACTION
NO CLICK REACTION
REC/PLAY SWITCH IS DEFEC-
TIVE
NO WHITE NOISE IS HEARD
THROUGH SPEAKER
HEAD-PHONE JACK WIRING
AND CONTACT ARE NOT
NORMAL
CHECK AND REPAIR OR
CHANGE
WIRING TO CONTROL PCB
(PCB-3863B) IS DEFECTIVE
WIRING FOR RESISTORS
(R125, R126) iS DEFECTIVE
eo ARE DEFEC-
! CHECK CLICK REACTION BY
WHITE NOISE IS HEARD TOUCHING TRANSISTOR Q1,
THROUGH SPEAKER Q2 BASE
CHECK AND REPAIR OR
CHANGE
WIRING FOR CAPACITORS
(C5, C6, C15, C16, C101, C102,
C105, C106, C108, C107) IS
DEFECTIVE OR CAPACITORS
ARE DEFECTIVE
CHECK CLICK REACTION BY MEASURE VOLTAGE OF TRANSISTORS (Q1—04,
TOUCHING TRANSISTORS THERE IS A CLICK REACTION AMPLIFIER (PCB-3863A) VOLTAGE 1S NORMAL Q101—Q104) ARE DEFEC-
Q301 AND 0302 BASES TIVE
WIRING FOR RESISTORS
VOLTAGE IS NOT NORMAL (R9-R18, R33, R34, R101—
R116, R135, R136) IS
CHECK AND REPAIR OR
CHANGE
CHECK AND REPAIR
DEFECTIVE
CAPACITORS (C3-C6,
C13—C18, C101—C 108)
ARE DEFECTIVE
CHANGE
lh
MEASURE VOLTAGE OF =
NO CLICK REACTION MAIA-AMIPLIFIER
VOLTAGE IS NORMAL
BRENOLEROSCS Oo" CHECK AND REPAIR
(PCB-3755B)
SOLDERED
TRANSISTORS (0301-0310)
VOLTAGE IS NOT NORMAL REE DEELCIE
TAPE ISPLAYED BUT SOUND REC/PLAY HEAD IS DEFEC-
VOLUME iS NOT SUFFICIENT: TIVE OR POSITION IS NOT CHANGE OR REPAIR
OR DISTORTED NORMAL RESISTORS (R301—-R326, CHECK AND REPAIR OR
R328-R332) ARE NOT CHANGE
OLDERED OR
34
RESISTORS ARE DEFECTIVE
TAPE IS DEFECTIVE CHANGE
eee CAPACITORS (C301,C302,C305, CHECK AND REPAIR OR
REC/PLAY HEAD AZIMUTH RE-ADJUST TO GAIN BEST C306,C309—C312) ARE NOT CHANGE
IS NOT PROPERLY ADJUSTED TREBLE SOUND PROPERLY SOLDERED OR
CAPACITORS ARE DEFECTIVE
| DUST IS STICKING TO HEAD
Y | SURFACE CLEAN
TAPE ISPLAYED BUT TONE
QUALITY, SPECIALLY FRE-
QUENCY CHARACTERISTIC
IS NOT NORMAL
TAPE IS DEFECTIVE CHANGE
| |
CHECK AND REPAIR OR
RESISTOR (R19—R22) WIRING
IS DEFECTIVE OR RESISTORS
ARE DEFECTIVE
CHANGE
CAPACITOR C19, C20, WIR-
ING IS DEFECTIVE OR
CAPACITORS ARE DEFEC-
CHECK AND REPAIR OR
CHANGE
TIVE
TRANSISTORS (Q1—04) ARE
DEFECTIVE CHANGE
TRANSISTORS (Q1—04) ARE
DEFECTIVE
MOTOR AND TRANSFOR-
MER ARE DEFECTIVE
TRANSISTORS (0301, 0302)
ARE DEFECTIVE
HEAD 1S MAGNETIZED DEMAGHEN GER MUCH NOISE IS CREATED
ONLY IN TAPE TRAVELLING
NOISE IS CREATED EVEN
WITHOUT TAPE
TAPE 1!SPLAYED BUT MUCH
HUM AND NOISE IS CREATED
CAPACITORS (C311, C312,
C601, C602) ARE DEFECTIVE
| |
DIODES (D601, D602) ARE
DEFECTIVE