Sharp VC-S2000HM, Service Manual

Page: 47 / 123

47
VC-S2000HM
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3)
NO Hi-Fi sound playback(E-E mode is possible).
Check peripheral circuit of IC6301 as shown in table.
Replace IC6301.
YES
NO
YES
Check PC 5V lines.
YES
YES NO
NO
Is there playback envelope signal out- putted at pins (19),(18) of IC6301?
Is the supply voltage of 5V fed to pin(20) of IC6301?
Is there A-H.SW.P. signal at pin(35) of IC6301?
Check the A-H.SW.P. line between pin(35) of IC6301 and pin(26) of IC701.
L-ch pins(10),(11),(12),(15),(16)
R-ch pins(41),(40),(39),(38),(37)
FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2)
No Hi-Fi sound recording(E-E mode is possible)
Check peripheral circuit of IC6301 as shown in table.
Replace IC6301.
Check PC 5V lines.
YES
YES NO NO
NO
YES
YES
NO NO
Is there REC FM signal outputted at the IC6301 pins (26) to (22)(CH-1)/pins(26) to (25)(CH-2).
Is the supply voltage of 5V fed to pin(20) of IC6301?
Check AH-MZ harness.
Is there "L" level at pin(33) of IC6301?
Check or replace the cylinder.
Check the Hi-Fi CTL line between pin(33) or IC6301 and pin(20) of IC701.
YES
Check the record current setting resistor R352 at pin(27) of IC6301.
L-ch pins(41),(40),(39),(38),(37)
R-ch pins(10),(11),(12),(15),(16)
FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING(1)
No linear sound recording(E-E mode is possible)
Is there "L" level at pin(99) of IC201?
Check the AUDIO MUTE (H) line between pin (99) of IC201 and pin(21) of IC701.
YES
YES
YES YES
YES
NO NO
NO
NO
NO
Is there signal at pin(4) of IC201?
Is the supply voltage of 12V fed to pin(2) of T651?
Check M 12V line.
Is there signal(Bias) at pin(5) of T651?
Check the Bias oscillation circuit(T651,Q651, Q652) and A-ERASE CTL line.
Is there signal(Bias + Audio sig.) at pin(6) of T651?
Check peripheral circuits of T651.
Check the MH-AA harness and A/C head.
Replace IC201.