Sharp DV-NC65H (serv.man6) Service Manual ▷ View online
52
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.7
Does the key switch make good contact, when the
cassette tape is inserted?
Check switch contact.
Is there the function control voltage inputted at the
pins(88) and (89) of IC701?
NO
YES
Check or replace the peripheral circuit of IC701.
YES
Key-in input is not received.
FLOW CHART NO.8
Operation is possible from the VCR, but no
operation is possible from the infrared remote
control.
Is the supply voltage of 5V fed up to pin(3) terminal
of remote control receiver?
Check AT 5V lines.
Is "L" pulse sent out from pin(1) terminal of receiver
when the infrared remote control is activated?
Replace the remote control receiver or replace the
remote control transmitter if necessary.
Is "L" pulse inputted to pin(4) of IC701?
Check line between remote control receiver thru
to pin(4) of IC701.
Replace IC701.
NO
NO
NO
YES
YES
YES
YES
No operation is possible from the infrared remote control.
FLOW CHART NO.9
Are start sensor shutter go to open when the
cassette tape is inserted?
Check start sensor shutter.
NO
YES
Does pin(87) of IC701 change from "H" to "L" level
when the cassette tape is inserted?.
Check between start sensor and pin(87) of IC701.
NO
YES
Does pin(10) of AC connector become to "H" level
(4.7V) when the cassette tape is inserted?
Check between pin(92) of IC701 and pin(10) of
AC connector.
NO
YES
Is the specified voltage (about 10V) applied at the
loading motor terminal when the cassette tape is
inserted?
Replace capstan motor unit.
NO
YES
Replace loading motor.
A cassette tape is not take in.
FLOW CHART NO.10
Does the start sensor pulse at pin(87) of IC701
change from "L" to "H" level when the cassette
tape is loaded?
Check line start sensor and all the way up thru to
pin(87) of IC701.
Does the end sensor pulse at pin(86) of IC701
change from "L" to "H" level when the cassette
tape is loaded?
Check line end sensor and all the way up thru to
pin(86) of IC701.
Does the master cam mode shifter operate
normally when the cassette tape is loaded?
Check cam switch (A), (B) and all the way
up thru to pins(94), (93) of IC701.
Replace IC701.
NO
NO
NO
YES
YES
YES
A cassette tape is taken in, but ejected at once.
FLOW CHART NO.11
Does the capstan motor start when the EJECT
button is pressed?
See FLOW CHART NO.13.
<The capstan motor fails to run.>
Does the take-up reel disk turn when the capstan
motor is running?
Check reel disk and reel drive unit.
Are pulses applied at pin(2) of IC701 when the
take-up reel disk is turning?
Check take-up reel sensor and all the
way up thru to pin(2) of IC701.
Replace cassette cam, gear, etc.
NO
NO
NO
YES
YES
YES
Is a "H" level (about 4.7V) applied at pin(10) of AC
connector when a reel pulse has been inputted?
Check pin(92) of IC701.
NO
YES
YES
Is the specified voltage applied at the loading
motor terminal?
Change the capstan motor unit.
NO
Does the loading motor run?
Replace loading motor.
NO
YES
The cassette tape fails to eject.
FLOW CHART NO.12
Does power control(H) signal at pin(96) of IC701
change from "L" to "H" level?
Check IC701.
Does the base of Q1905 change from about 5V
to 4.5V?
Check the pin(96) of IC701 and all the way up thru
to Q1905.
Is 5V sent out of the emitter of Q1905?
Check Q1905 and the AT 5V line.
NO
NO
NO
YES
YES
No power is turned on.
53
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.13
Is the voltage more than about 2.6V DC given out
of pin(29) of IC701?
Check IC701.
Is the supply voltage of 5V fed up to pin(3) of
AC connector?
Check PC 5V line.
Is the voltage more than 2.6V DC sent in pin(9) of
AC connector?
Check between the pin(9) of AC connector and all
the way up thru to pin(29) of IC701.
Replace capstan motor.
NO
NO
NO
YES
YES
YES
Is approx. 3.5V applied to the pin(5) of
AC connector?
Check the pin(91) of IC701.
NO
YES
Is 29V applied to the pin(2) of AC connector
normally?
Check AT 27V line.
NO
YES
The capstan motor fails to run.
FLOW CHART NO.14
Is the voltage more than about 2.6V DC given out
of pin(30) of IC701?
Check IC701.
Is the supply voltage of 5V fed up to pin(3) of
AC connector?
Check PC 5V line.
Is the voltage more than about 2.6V applied at
pin(12) of AC connector?
Check between pin(30) of IC701 and all the way
up to pin(12) of AC connector.
NO
NO
NO
YES
YES
Is the supply voltage of 12V fed up to pin(8) of
AC connector?
Check PC 12V line.
NO
YES
Check or replace drum motor.
YES
The drum motor fails to run.
FLOW CHART NO.15
Is drum PG/FG signal given out of pin(11) of
AC connector?
Check or replace capstan motor or drum motor.
Check line between pin(11) of AC connector and
all the way up thru to pin(65) of IC701.
Is V-H.SW.P pulse given out of pin(23) of IC701?
Check IC701.
Replace IC701.
NO
NO
NO
YES
YES
YES
Is drum PG/FG signal given out of pin(65) of
IC701?
The drum motor runs only for a few seconds.
FLOW CHART NO.16
Is the drum motor rotating?
See FLOW CHART NO.14, 15.
<The drum motor fails to run>
<The drum motor runs only for a few seconds>
Is the drum PG signal and drum FG signal present
on pin(65) of IC701, respectively?
Replace IC701.
Are the drum PG/FG signals present on pin(11) of
AC connector?
Check line between pin(11) of AC connector and
all the way up thru to pin(65) of IC701.
NO
YES
NO
YES
NO
YES
No head switching pulse.
D-FG
D-PG
0 V
about 2.5 V
about 5.0 V
Check or replace capstan motor unit or
drum motor unit.
FLOW CHART NO.17
Is there 14.3MHz oscillation at pins(37) and (38)
of IC701?
Check peripheral circuit of X701.
Is there drum PG/FG signal at pin(65) of IC701
present?
Is there V-SYNC signal (reference) at pin(50) of IC701?
NO
YES
In PB mode
YES
In REC mode
Is the head switching pulse at pin(23) of IC701
present?
See FLOW CHART NO.16.
<No head switching pulse>
NO
YES
NO
Is the drum APC output at pin(34) of IC701 and
drum AFC output at pin(32) of IC701 present?
Replace IC701.
NO
YES
Is the drum control voltage applied to pin(12) of
AC connector?
Is pin(30) of IC701 in high impedance?
NO
YES
YES
Replace capstan motor or drum motor.
Drum servo does not function.
Check peripheral circuit of C715, C716 and R708.
NO
Check drum PG/FG signal line.
54
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.18
2
Only REC mode inoperative
YES
NO
NO
YES
YES
YES
NO
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
NO
YES
YES
NO
Are REC and/or PB mode inoperative?
Check peripheral circuit of X701.
1
Only PB mode inoperative
Does PB CTL signal appear at
pin(76) of IC701 (TP204)?
Does AA-MH harness normally?
Does A/C head operate normally?
Replace A/C head.
Check AC-MC connector and
capstan FG signal line.
Check capstan motor unit and/or
replace.
Is there capstan AFC and APC
at pins(31) and (33) of IC701?
Replace IC701.
Replace AA-MH harness.
Readjust the A/C head height.
Is there 14.3MHz oscillation at
pins(37) and (38) of IC701?
Does the capstan FG signal appear
at pin(67) of IC701?
Dose pin(29) of IC701 operate
normally?
Check
1
.
Check
2
.
Replace IC701.
Is there REC CTL signal output at
pins(74) and (75) of IC701?
Is the V-SYNC signal (reference)
at pin(50) of IC701?
Check peripheral circuit of
C715~716 and R708.
Is there capstan AFC and APC
at pins(31) and (33) of IC701?
Capstan servo does not function.
55
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.19
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
NO
NO
NO
YES
YES
Is picture signal inputted into pins(28) and (31) of
IC201?
Is picture signal outputted to the pin(52) of IC201?
Is picture signal inputted into the pin(49) of IC701?
Check the line between pin(52) of
IC201 and pin(49) of IC701.
Is 5V applied to the pin(12) of IC201?
Check the PC 5V line.
1
U/V tuner mode, LINE1/LINE2 input mode:
Is picture signal output at the pin(5) of IC2501?
• U/V tuner mode:
Check the line between the pin(24) of
TU101 and the pin(18) of IC2501.
• LINE1, LINE2 input mode:
Check the line between LINE1 and
LINE2 terminal, and the pins(23) and
(28) of IC2501.
2
LINE3 (FRONT) input mode:
Is picture signal output at the pin(2) of IC2002?
Is picture signal outputted to the pin(47) of IC701 ?
Is 5V applied to the pin(51) of IC701?
Check the V
DD
line of IC701.
Is picture signal outputted to the emitter of video
output buffer (Q251)?
VCR/DVD OUT:
Is there picture signal input at the pin(6) of IC2003?
Check the line between pins(62) and (63) of IC201
and pins(84) and (85) of IC701.
Check Q251 periphery.
NO
Check the line between the Q251 emitter
and the pin(5) of IC2003.
Is there picture signal output at the pin(2) of IC2003?
YES
NO
Check the VIDEO OUT terminal (J1202) and the
line between the pin(2) of IC2003 and the VIDEO
OUT terminal (J1202).
YES
YES
Is the pin(1) of IC2003 on "L" level?
Replace IC2003.
NO
Check the
DVD-(H) line.
NO
Is 5V applied to the pin(6) of IC2003?
Check the PC 5V line.
Are serial data and clock signal applied to the pins
(63) and (62) of IC201?
YES
Check the line between the pin(5) of IC2501 and
the pin(31) of IC201.
YES
NO
NO
Check the line between LINE3 (FRONT)
input terminal and the pin(6) of IC2002.
NO
Is picture signal input at the pin(6) of IC2002?
YES
Is 5V applied to the pin(3) of IC2002?
YES
NO
Is the pin(1) of IC2002 on "L" level?
Check the PC 5V line.
NO
Check the DUB (H) line.
Replace IC2002.
YES
Picture E-E does not appear.
LINE1, LINE2 output:
Is there picture signal input at the pin(5) of IC2706?
Check the line between Q251 emitter and the pin(5)
of IC2706. (Check the pin(2) of SC2505 and the pin
(18) of SC2721.)
YES
YES
Is there picture signal output at the pin(7) of IC2706?
NO
Check the line between the pin(7) of IC2706 and
the pin(7) of IC2501. (Check C2522.)
NO
Is there picture signal input at the pin(7) of IC2501?
YES
YES
Is there picture signal output at the pin(25) and the
pin(26) of IC2501?
pin(25) : LINE1 output
pin(26) : LINE2 output
Check the line between IC2501 periphery and the
output terminal periphery.
Is 5V applied to the pin(6) of IC2706?
NO
Check peripheral circuit of IC2501.
NO
YES
NO
Is the pin(4) of IC2706 on "H" level?
Check the PC 5V line.
NO
Check the line between
Q2302 collector and the
pin(4) of IC2706, and
check the DVD-(H) line.
Replace IC2706.
YES
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