Sharp DV-NC65H (serv.man15) Service Manual ▷ View online
57
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.21
NO
NO
YES
YES
YES
NO
NO
YES
YES
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
YES
Is FM signal (approx. 0.4 Vp-p)
inputted to the pin(78) of IC201?
Is the luminance signal (approx.
0.25 Vp-p) inputted and outputted
to the pins(13), (14) and (16) of
IC201, respectively?
Is luminance signal (approx. 0.5 Vp-p)
inputted to the pin(19) of IC201?
Is luminance signal (approx. 0.3 Vp-p)
inputted to the pin(42) of IC201?
Is luminance signal (approx. 0.5 Vp-p)
inputted to the pin(26) of IC201?
Is luminance signal (approx. 0.5 Vp-p)
inputted to the pin(23) of IC201?
Replace IC201.
Check between the pins(78) and
(79) of IC201.
Is luminance signal (approx. 0.4 Vp-p)
inputted to the pin(79) of IC201?
Is V-H.SW.P. applied to the pin
(81) of IC201?
Check V-H.SW.P. line.
Check the periphery of pins(13), (14)
and (16) of IC201. (Check C203,
C205, R201~203, L201)
Check between the pin(18) and
pin(19) of IC201. (Check C206.)
Check between the pin(21) and
pin(42) of IC201. (Check C208.)
Check between the pin(26) and
pin(39) of IC201. (Check C212.)
Is luminance signal (approx. 0.5 Vp-p)
outputted from the pin(39) of IC201?
Is voltage 5V applied to the CCD section power terminal pin(36) of IC201?
Is control voltage approx. 5V applied normally to the pin(37) from the pin(57) of IC201?
Is CCD clock signal (approx. 7.16 MHz/0.5 Vp-p) applied to the pin(44) from the pin(69) of IC201?
Check between the pins(23) and (24) of IC201. (Check C210.)
Replace IC201.
Check between the pins(54) and
pin(55) of IC201. (Check C514.)
Is chroma signal (approx. 286
mVp-p/Burst) inputted into the
pin(54) of IC201?
Is chroma signal (approx. 508
mVp-p/Burst) inputted into the
pin(58) of IC201?
Check between the pin(35) and
pin(58) of IC201.
(Check C515.)
Is chroma signal (approx. 508
mVp-p/Burst) outputted from
the pin(35) of IC201?
Check whether the pin(71) and pin
(73) of IC201 oscillate (4.43 MHz)?
Check between the pin(46) and
pin(60) of IC201. (Check C512.)
Check the periphery of pin(61) of
IC201 and PC 5V line.
Is voltage 5V applied to the chroma
power terminal pin(61) of IC201?
Is chroma signal (approx. 403
mVp-p/Burst) inputted into the
pin(46) of IC201?
Playback picture does not appear (E-E mode is possible).
Although picture is played back, color does not appear (E-E mode is possible).
58
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.22
NO
Check the peripheral circuit of front input terminal.
L-ch
R-ch
Front input terminal (L3)
Rear input terminal (L1, L2)
YES
NO
YES
YES
NO
Tuner audio terminal
YES
YES
NO
NO
NO
NO
NO
• Check the peripheral circuit of rear input terminal.
• Check the peripheral circuit of IC2501.
Check the regulator circuit of Hi-Fi 5V and PC 9V.
Replace IC651.
NO
Is there signal inputted at each
terminal of IC651 as shown in table?
pin(15)
pin(10)
pin(14)
pin(9)
DVD audio
pin(1), (2)
pin(3), (4)
Is the voltage 5V applied to pin(40) of IC651,
9V applied to pin(58)?
Are serial data and clock signal at pins(42),
(43) of IC651?
Line output terminal connection:
Is the audio signal outputted respectively to the
pins(53) and (57) of IC651?
•
VCR/DVD OUT Line output terminal connection:
Check line between VCR/DVD OUT audio output
terminal (J1202) and pins(53), (57) of IC651.
• LINE1, LINE2 output terminal connection:
Is the audio signal input at pins(1), (2) of IC2501.
Is the audio signal output at pins(42), (43) and
(30), (31)?
Check line between pins(53), (57) of IC651 and
pins (1), (2) of IC2501.
Check the peripheral circuit of IC2501 or
replace IC2501.
Check line between LINE1, LINE2 audio output
terminal (SC2501) and pins(42), (43) and (30), (31).
Is "L" level applied at pin(36) of IC651?
Is "H" level applied at pin(28) of IC651?
Check line between pins(42), (43) of IC651
and pins(17), (18) of IC701.
YES
NO
Check line between pin(36) of IC651 and
pin(81) of IC701.
Is Sub carrier signal (4.43 MHz, about 900 mVp-p)
inputted to pin(45) of IC651?
Check line between X501 and pin(45) of IC651.
•
Is there SIF signal inputted to IC1701 from pin(22)
of Tuner?
No Hi-Fi E-E sound heard.
YES
YES
FLOW CHART NO.23
NO
YES
NO
YES
NO
YES
NO
Is terminal voltage (REC AGC. ADJ.) pin(37) of
IC651 normal?
Is record FM signal outputted to the pins(21)~(24)
(ch-1)/pins(21) and (22) (ch-2) of IC651?
Check the AH-MZ connector.
Replace IC651.
Is the pin(29) of IC651 about 3.7V?
Check Hi-Fi REC CTL line.
Is voltage 5V applied to the pin(25) of IC651?
Check line of Hi-Fi 5V.
Hi-Fi sound cannot be recorded (E-E mode is normal).
FLOW CHART NO.24
NO
YES
NO
YES
Is playback envelope signal outputted to the pins(29)
and (30) of IC651? (300 mVp-p)
Replace IC651.
Replace IC651.
Is A-H.SW.P input into the pin(27) of IC651?
Check the A-H.SW.P. line from the pin(27) of
IC651 to the pin(26) of IC701.
Hi-Fi sound cannot be played back (E-E mode is normal).
FLOW CHART NO.25
NO
YES
NO
YES
YES
Is audio signal inputted into the IC201 pin(8) and
pin(9)?
pin(8) : LINE input terminal
pin(9) : U/V tuner audio input
Does the bias oscillation circuit operate normally?
Is audio signal on which bias signal is superposed
outputted to the pin(4) of IC201?
Check the AA-MH harness and A/C head.
Check the bias oscillation circuit (T601, Q602,
Q603).
• Check the line between the pin(61) of IC651 to the
pin(8) of IC201.
• Check the line between the pin(21) of TU101 and
the pin(9) of IC201.
Recording in linear audio is impossible (Hi-Fi E-E mode is normal).
FLOW CHART NO.26
NO
NO
YES
YES
YES
PAL EP ONLY
YES
NO
YES
NO
YES
Is it possible to confirm the audio signal (PB EQ)
on the pin(100) of IC201?
Is audio signal output to the pin(11) of IC201?
Check the line between the pin(11) of IC201 to
the pin(62) of IC651.
Are MH-AA harness and playback AMP. peripheral
parts normal?
Is the A/C head surface clean?
Is A/C head height adjusted properly?
Replace the A/C head.
Readjust the A/C head height.
Replace IC201.
Are there signal at the pin(1) of IC601?
Linear audio playback is impossible. (Hi-Fi E-E mode is normal).
59
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.27: NICAM/IGR TROUBLESHOOTING
NO
YES
NO
NO
YES
Is there a base band signal at SIF OUT of
TU101.
Is there a base band signal at pin(2) of IC1701?
NO
Check peripheral circuit of X1701.
Check peripheral circuit of TU101.
Check between SIF OUT of TU101 and pin(2)
of IC1701
No NICAM/IGR sound.
NO
NO
YES
YES
YES
Is there a NICAM/IGR audio signal at pins(31),
(30) of IC1701?
Is there a NICAM/IGR audio signal at pins(15),
(16) of IC2501?
Check PC 5V line..
Is 5V supplied at pins(11), (19), (1) of IC1701?
Is MPX 8V supplied at pin(33) of IC1701?
YES
Check line between pins(39), (40) of IC2501
and pins(9), (14) of IC651.
YES
Check AT 12V line.
YES
Check peripheral circuit of IC1701.
YES
Replace IC1701.
YES
Is there oscillated 18.432MHz at pins(5), (6)
of IC1701?
NO
Check Q1701, Q1702 and D1701.
NO
See FLOW CHART NO.22
<Hi-Fi E-E SOUND
TROUBLESHOOTING>
Check serial data and clock at pin(12) and (13)
of IC1701.
Check between PLL Data
pins(26), (27) of IC701 and
pins(12), (13) of IC1701.
60
DV-NC65H/S
DV-NC70H
DV-NC70H
(D
VD)
FLOW CHART NO.1
Is the supply voltage of 5V fed up to pin(37) of
IC8051?
Check the STBY 5V line.
Is the supply voltage of 3.4V, 1.7V fed up to pin
(38), (39) of IC8051?
Check the pins(38) and (39) of IC8051 and their
periphery circuit.
Check the signal lines of LCD RESET, LCD CS,
LCD DATA, LCD CLK on pins(36), (42), (43), (44)
of IC8051.
Check signal line of LCD RESET, LCD CS, LCD
DATA, LCD CLK on pins(6), (12), (8) (10) of IC801.
Is the OSC signal present on pin(41) of IC8051?
Check periphery circuit of pin(41) of IC8051.
Are common and segment signals supplied from
IC8051 (LCD driver IC) to LCD8052 (LCD)?
Replace IC8051.
Check that the flourescent display tube is free from
damages.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Check signal line between IC3501 and IC801.
Check signal of LCD RESET, LCD CS, LCD DATA,
LCD CLK on pins(5), (13), (9), (11) of IC801.
Yes
Check the signal lines between IC801 and IC8051.
Check or replace IC801.
The fluorescent display tube does not light.
No
No
FLOW CHART NO.2
Is key switch contact and installation state normal?
Replace key switch.
Is the control voltage normally into the pins(72),
(73) of IC3501?
No
Yes
The key operation is disabled.
KEY-1/2
3.3V
2.5V
1.8V
0.9V
0V
KEY
–
2
KEY
–
1
OFF
SW8053
STOP
SW8052
PLAY
Check AT 5V line.
Replace the remote control receiver.
FLOW CHART NO.3
Operation is possible from the DVD, but no
operation is possible from the infrared remote
control.
Replace the remote control receiver or replace the
remote control transmitter if necessary.
Is 5V voltage supplied to the pin(3) terminal of
remote control receiver?
Check the line between the remote control receiver
and the pin(42) of IC3501.
Is the "L" pulse sent out from pin(1) terminal of receiver
when the infrared remote control is activated?
Is pulse signal supplied to the pin(42) of IC3501?
Replace IC3501.
No
No
No
No
Yes
Yes
Yes
Yes
No operation is possible from the infrared remote control.
FLOW CHART NO.4
Is the LOAD signal inputted to R3763?
Check pin(61) of IC3701. Check LOAD signal line
between IC3701 and IC3704.
Check IC3704.
Check for mechanism and gear engagement and breakage.
Is loading motor drive voltage outputted from the
pins(11) and (12) of IC3704?
Is the loading motor drive voltage applied to the
terminal of loading motor?
Check the line between the IC3704 and the
loading motor. Check CN3702.
No
No
No
Replace IC3704.
Yes
Yes
Yes
Yes
The disc tr
a
y
cannot be opened and closed.
No
Is FE signal inputted into the pin(117) of IC3701?
Check or replace IC3701.
Check the line between the IC3301 and IC3701.
FLOW CHART NO.5
Does the optical pickup move up and down after
the disc is removed? (Checking of symptom.)
See FLOW CHART NO.6. <The [No Disc] indication.
(In case focus servo does not function.)>
Replace IC3301.
Is there input signal on the pins(49), (50), (51), (52)
of IC3301?
Is FE signal outputted from the pin(22) of IC3301
when the disc is set?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
No
No
Yes
No
Yes
Yes
Yes
The [No Disc] indication.
(In case of f
ocus error)
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