Sharp DV-NC70 - Page 48

48
DV-NC70/W
DV-NC70X/RU
FLOW CHART NO.24: Hi-Fi SOUND MODE TROUBLESHOOTING (2)
NO
Replace IC651.
L-ch pins (16), (17), (18), (19)
YES
NO
YES
R-ch pins (35), (34), (33), (32)
Check PC 5V line.
NO
NO
YES
Check peripheral circuit of IC651 as shown
in table.
Is there REC FM signal outputted to the pins (21)
and (24)<ch-1>/pins (21) and (22)<ch-2> of IC651?
YES
Check AH-MZ harness.
YES
Check or replace the cylinder.
Is the supply voltage of 5V fed to pin(25) of IC651?
YES
Check the Hi-Fi CTL(H) line between pin(29) of
IC651 and pin(22) of IC701.
Check the record AGC setting resistor R678 at
pin(37) of IC651.
Is there H level at pin(29) of IC651?
Replace IC651.
No Hi-Fi sound recording (E-E mode is possible).
FLOW CHART NO.25: Hi-Fi SOUND MODE TROUBLESHOOTING (3)
NO
Replace IC651.
YES
YES
NO
NO
YES
Is there playback envelope signal (about 300 m
Vp-p) outputted to the pins (29), (30) of IC651?
YES
Replace IC651.
Is the supply voltage of 5V fed to pin(25) of IC651?
Check the A-H.SW.P. line between pin(27) of
IC651 and pin(28) of IC701.
Is there A-H.SW.P. signal at pin(27) of IC651?
No Hi-Fi sound playback (E-E mode is possible).
L-ch pins (16), (17), (18), (19)
R-ch pins (35), (34), (33), (32)
Check peripheral circuit of IC651 as shown
in table.
FLOW CHART NO.26: LINEAR SOUND MODE TROUBLESHOOTING (1)
NO
Check the line between the pin(61) of IC651 and
the pin (8) of IC201.
YES
NO
NO
NO
NO
Replace IC201.
Is there audio signal inputted into the pin(8)
of IC201?
YES
Check the MH-AM harness and A/C head.
Check PC 12V line.
Check the Bias oscillation circuit (T601, Q602,
Q603) and FE BIAS CTL line.
Check peripheral circuits of T601.
YES
Is the supply voltage of 12V fed to pin(2) of T601?
YES
YES
Is there signal (Bias + Audio sig.) at pin(6) of T601?
No linear sound recording (Hi-Fi E-E mode is possible).
Is there a signal at pin(4) of IC201?
Is there signal (Bias) at pin(5) of T601?
FLOW CHART NO.27: LINEAR SOUND MODE TROUBLESHOOTING (2)
NO
Are the MH-AA harness and the PB AMP. peripheral
parts Normal?
YES
YES
NO
Is there a signal at pin(100) of IC201?
Is there a signal at pin(11) of IC201?
Replace A/C head.
Replace IC201.
Readjust azimuth height.
YES
YES
Is the azimuth height of A/C head properly adjusted?
Clean A/C head.
YES
NO
NO
Check line between pin(11) of IC201 and pin(62)
of IC651.
Is there audio signal inputted at pin(62) of
IC651?
No linear sound playback (Hi-Fi E-E mode is possible).