Sharp VC-ME80HM Service Manual ▷ View online
49
VC-ME80GM
VC-ME80HM
VC-ME80HM
YES
YES
NO
NO
NO
NO
YES
FLOW CHART NO.25 NICAM/IGR TROUBLESHOOTING <Except IGR only models>
NO
NO
YES
YES
YES
YES
YES
Is 5V supplied at pins(6), (16), (46)
of IC1701?
Check PC 5V line.
Is 8V supplied at pin(33) of IC1701?
Check the REG. circuit of Q1703
and Q1704.
Check STBY 10.5V line.
Check peripheral circuit of IC1701.
Replace IC1701.
Check peripheral circuit of X1701.
Is there NICAM/IGR audio signal
at pins(31), (30) of IC1701?
Is there NICAM/IGR audio signal
at emitter of Q1705, Q1706?
YES
YES
Check peripheral circuit of IC1602.
Check between pin(13) of IC1602
and pin(47) of IC1701. (Q1615)
Check serial data and clock at
pins(8) and (7) of IC1701.
Is there oscillated 18.432MHz at
pins(51), (52) of IC1701?
No NICAM/IGR sound.
Is there base band signal at
pin(47) of IC1701?
Is there base band signal at pin(13)
of IC1602?
Check line between emitter of
Q1705, Q1706 and pins(8), (13) of
IC6651.
YES
YES
YES
NO
NO
NO
Is there REC FM signal(L-ch
600mVp-p) outputted to the pin(21)
of IC6651?
Is there REC FM signal outputted to
the IC6651 pins(21) to (24)(ch-1)/
pins(21) to (22) (ch-2)?
Check the Hi-Fi CTL (L) line between
pin(29) of IC6651 and pin(20) of IC701.
Check the record current setting
resistor R6670 at pin(37) of IC6301.
Check AH-MZ harness.
Replace IC6301.
Is there "L" level at pin(29) of IC6651?
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(2)
No Hi-Fi sound recording(E-E mode is possible)
YES
YES
NO
NO
FLOW CHART NO.24 Hi-Fi SOUND MODE TROUBLESHOOTING(3)
Is there playback envelope signal
(approx. 300mVp-p) outputted to the
pins(29), (30) of IC6651?
Check the AUDIO MUTE (H) line
between pin(27) of IC6651 and
pin(26) of IC701.
Replace IC6301.
Replace IC6301.
Is there A-H.SW.P. signal at pin(27)
of IC6651?
No Hi-Fi sound playback(E-E mode is possible)
50
VC-ME80GM
VC-ME80HM
VC-ME80HM
FLOW CHART NO.26 DECODER TROUBLESHOOTING
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin(47) of IC701(Y/C video output)
E2(L2) video input
→
pin19
pin18
pin20
→
E1(L1) video output
21PIN CONNECTOR
(B)
→
(A)
Pin(59) of IC6301(Audio output L-ch)
E2(L2) audio input(L-ch)
→
pin36
pin1
pin35
→
E1(L1) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(A)
Pin(55) of IC6301(Audio output R-ch)
E2(L2) audio input(R-ch)
→
pin33
pin3
pin32
→
E1(L1) audio output(R-ch)
21PIN CONNECTOR
(B)
→
(A)
Tuner video output
E1(L1) video input
Pin(47) of IC701(Y/C video output)
→
pin16
pin14
pin19
pin23
→
E2(L2) video output
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(L-ch)
E1(L1) audio input(L-ch)
Pin(59) of IC6301(Audio output L-ch)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(R-ch)
E1(L1) audio input(R-ch)
Pin(55) of IC6301(Audio output R-ch)
→
pin11
pin7
pin33
pin28
→
E2(L2) audio output(R-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
E2(L2) video input
E1(L1) video input
Tuner video output
→
pin18
pin14
pin16
pin21
→
Pin31 of IC201
Y/C video input
(Tuner/Aux. input)
(B)
→
(C)
→
(A)
E2(L2) audio input(L-ch)
E1(L1) audio input(L-ch)
MPX. output(L-ch)
→
pin1
pin5
pin9
pin31
→
Pin61 of IC6301
Audio input(L-ch)
(B)
→
(C)
→
(A)
E2(L2) audio input(R-ch)
E1(L1) audio input(R-ch)
MPX. output(R-ch)
→
pin3
pin7
pin11
pin30
→
Pin52 of IC6301
Audio input(R-ch)
(B)
→
(C)
→
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 10.5V line.
Check line between pins(25), (26)
of IC2501 and pins(17), (18) of
IC701.
Is voltage 5V applied to the video
section power terminal at pins(15),
(17) of IC2501?
Is voltage 10.5V applied to the
audio section power terminal at
pins(8), (10) of IC2501?
Check signal line from video and
audio function logic table as shown
below.
Not output from 21pin connector in video and audio signal.
are there SDA and SCL signal
applied to pins(25) and (26) of
IC2501?
FLOW CHART NO.27 GAMMA TROUBLESHOOTING
NO
NO
NO
YES
YES
YES
Check the line between the pin(1) of
IC4401 and the pin(7) of IC4401.
Is the luminance signal output to the
GAMMA input Q4401 emitter?
Check the line between the pin(6) of
IC4503 and Q4401.
Is the luminance signal output to the
pin(1) of impedance conversion
circuit IC4401?
Is the luminance signal output to
the pin(5) of slice, low luminance
part amplification IC4403?
NO
Check the line between the pin(1) of
IC4401 and the pin(5) of IC4403.
YES
Is the luminance signal output to the
pin(7) of impedance conversion,
slice circuit IC4402?
NO
Check the line between the pin(5) of
IC4403 and the pin(7) of IC4402.
YES
Is the video signal input into the
pin(1) of video level adjusting circuit
IC4403?
NO
Check the peripheral circuit of
Q4408, Q4410, R4414, R4415,
R4416, R4431, and R4433.
YES
Is the video signal input into the
pin(3) of luminance signal selection
circuit IC4409?
NO
Check the video level adjustment
(IC4403) circuit and video
amplification (IC4402) circuit.
YES
Check or replace the periphery of
IC4409.
Is the pin(2) of IC4409 in "H" level
state?
Is the video signal output to the
pin(7) of luminance signal selection
circuit IC4409?
YES
Check the GAMMA(H) line.
Check the line between the pin(2) of
IC4409 and the pin(35) of IC701.
Even when each signal can be
confirmed, adjust again according to
the specified adjustment procedure.
1. GAMMA slice level adjustment
2. GAMMA level adjustment
3. GAMMA sync level adjustment
4. GAMMA video output level
adjustment
YES
NO
NO
Does the pedestal clamp circuit
(IC4501, IC4404, IC4405) operate
normally?
The GAMMA correction circuit does not operate.
Is the luminance signal output to the
pin(7) of slice, impedance
conversion circuit IC4401?
Check the line between the pin(1) of
IC4401 and the Q4401 emitter.
51
VC-ME80GM
VC-ME80HM
VC-ME80HM
REPLACEMENT OF IC705(E
2
PROM)
Servicing precautions
When the IC705(E
2
PROM) has been replaced, make the following reprogramming.
Depending on models, the IC705(E
2
PROM) has been factory adjusted for it’s memory function.
It’s therefore necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the slow and still modes.
Note that the servo circuit requires readjustments for the slow and still modes.
1. Memory function reprogramming.
1. Check the power off. (Power is standby mode)
2. Make for moment short-circuit test point(P802), located at the front side on the main PWB.
2. Make for moment short-circuit test point(P802), located at the front side on the main PWB.
Be sure that all the fluorescent display tube light up into the TEST mode.
3. Using the CHANNEL(
'
) and (
"
) buttons, select the right function numbers from JP0 to JP39, which appear in the
fluorescent display tube, referring to the E
2
PROM map.
Press the DISPLAY button to pickup the functions(ON) and the CLEAR button to discard the functions(OFF).
DISPLAY and CLEAR buttons, are located on the remote control unit.
DISPLAY and CLEAR buttons, are located on the remote control unit.
∗
when the DISPLAY button has been pressed (ON), the memory function number starts flashing.
∗
when the CLEAR button has been pressed (OFF), the memory function number lights up.
4. Press the FF button on the remote control unit.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
5. Similarly to the above step 4, press the STOP button on the remote control unit.
By doing, upper 3 of the 10 digits are displayed in hexadecimal notation.
6. Example : "ON" and "OFF" are taken as "1" and "0" respectively.
The numbers JP0 to JP39 are divided into four groups and each group’s setting is displayed in hexadecimal notation.
1
When the press the FF button on the remote control unit.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
JP27 JP26 JP25 JP24
1
1
0
0
↓
C
JP23 JP22 JP21 JP20
0
0
0
0
↓
0
JP19 JP18 JP17 JP16
0
0
0
0
↓
0
JP15 JP14 JP13 JP12
0
1
0
0
↓
4
JP11 JP10 JP9 JP8
0
0
1
1
↓
3
JP7 JP6 JP5 JP4
0
0
0
0
↓
0
JP3 JP2 JP1 JP0
0
0
0
0
↓
0
2
When the press the STOP button on the remote control unit.
By doing, upper 3 in the 10 digits are displayed in hexadecimal notation from the feature function.
Also recording level preset number selected from the ten keys on the remote control unit which appear in the
fluorescent display tube, referring to the E
By doing, upper 3 in the 10 digits are displayed in hexadecimal notation from the feature function.
Also recording level preset number selected from the ten keys on the remote control unit which appear in the
fluorescent display tube, referring to the E
2
PROM map.
3
When the press the REW button on the remote control unit.
By doing, recording level preset number selected from the ten keys on the remote control unit which appear in
the fluorescent display tube, referring to the E
By doing, recording level preset number selected from the ten keys on the remote control unit which appear in
the fluorescent display tube, referring to the E
2
PROM map.
Out lights
blank
SP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
"0" fixed
displayed
JP39 JP38 JP37 JP36
0
0
0
0
↓
0
JP35 JP34 JP33 JP32
0
0
0
0
↓
0
JP31 JP30 JP29 JP28
0
0
0
0
↓
0
Out lights
blank
EP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
EP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
52
VC-ME80GM
VC-ME80HM
VC-ME80HM
2. Memory recording preset level reprogramming.
1. Similarly to the above step 1-1 and 2 the same operate.
2. Using the CHANNEL (
2. Using the CHANNEL (
'
) AND (
"
) buttons, select the right function numbers continued from recording preset
number as has been JP0 to JP39, which appear in the fluorescent display tube, referring to the E
2
PROM map.
3. Press the STOP or REW button on the remote control unit.
By doing, recording level preset number selected by turn from the ten keys on the remote control unit, which appear
in the fluorescent display tube referring to the E
in the fluorescent display tube referring to the E
2
PROM map.
4. Example :
System
p : PAL
n : NTSC
↓
Tape speed
→
LP or EPor SP p or n
∗
∗
↑
↑
Chrominance preset number. (from "0" to "7")
Luminance preset number. (from "0" to "7")
3. Finally make for a moment short-circuit test point(P812), both located at the front side on the main PWB to clear the
TEST mode.
Click on the first or last page to see other VC-ME80HM service manuals if exist.