DOWNLOAD Sharp VC-MH85 (serv.man4) Service Manual ↓ Size: 76.47 KB | Pages: 15 in PDF or view online for FREE

Model
VC-MH85 (serv.man4)
Pages
15
Size
76.47 KB
Type
PDF
Document
Service Manual
Brand
Device
VCR / Trouble shooting guide
File
vc-mh85-sm4.pdf
Date
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49
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
YES
YES
NO
NO
FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2) 
NO
YES
Replace IC651.
Is there a REC FM signal outputted 
at the IC651 pins(29) to (24) (CH-1) 
/pins (21) to (22)(CH-2).
Check PC 5V lines.
Check  the AGC setting resistor R678 
and pin (39) of IC651.
YES
No HI-FI sound  recording(E-E mode is posible).
Check peripheral circuit of IC651 as
shown in table.
L-ch pins (16),(17),(18),(19)
R-ch pins (32),(33),(34),(35)
Check AH-MZ harness.
Check or replace the cylinder.
Is the supply voltage of 5V fed to pin 
(25) of IC651?
Is there "L" level at pin (36) of IC651?
NO
NO
YES
NO
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3) 
NO
YES
Replace IC651.
Is there playback envelope signal out
putted at pins(29) to (30) of IC651?
Check PC 5V lines.
Is there A-H.SW.P. signal at 
pin (27) of IC651?
YES
No HI-FI sound  playback(E-E mode is possible).
Check peripheral circuit of IC651 as
shown in table.
L-ch pins (16),(17),(18),(19)
R-ch pins (32),(33),(34),(35)
Is the supply voltage of 5V fed to pin 
(25) of IC651?
NO
Check the A-H.SW.P. line between pin 
(27) of IC651 and pin (28) of IC701.
YES
FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING(1) 
No linear sound recording (E-E mode is possible)
Check the AUDIO MUTE (H) line 
between pin (99) of IC201 and pin 
(81) of IC701.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is there signal at pin (4) of IC201?
Replace IC201.
Is  the supply voltage of 12V fed to
pin (2) of T601?
Check M 12V line.
Is there signal (Bias) at pin (5) of T601?
Check the Bias oscillation circuit (T601,
Q602,Q603) and A-ERASE CTL line.
Is "L" level applied at pin(99) of 
IC201?
Check peripheral circuits of T601.
Check the MH-AA harness and A/C
head.
Is there signal (Bias + Audio sig)
 at pin (6) of T601?
50
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
YES
YES
NO
Is there signal at pin (100) of IC201?.
Are there MH-AA
 harness and the PB 
AMP
peripheral parts normal?
No linear sound playback (E-E mode is possible)
NO
Is the azimuth height of 
A/C head properly
adjusted?
Check the 
AUDIO MUTE (H) line between 
pin (99) of IC201 and pin (81) of IC701.
NO
Is there "L" level at pin (99) of IC201.
Is there signal at pin (1
1) of IC201.
YES
YES
Replace IC201.
Clean A/C 
head.
Replace A/C 
head.
Replace IC201.
Re-adjust azimuth.
NO
YES
YES
YES
YES
PA
L
 E
P
 ONL
Y
Are there signal at pin(1) of 
IC601?
YES
NO
Hi-Fi model ONL
Y
Is there audio signal inputted at 
and pin(62) of IC651.
Check line between pin(1
1) of IC201 
and pin(62) of IC651.
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING(2)
51
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
YES
YES
NO
NO
NO
NO
YES
FLOW CHART NO.26 NICAM/IGR TROUBLESHOOTING
NO
NO
YES
YES
YES
YES
YES
IC1701?
Check peripheral circuit of X1701.
YES
YES
Check peripheral circuit of 
TU101.
Check between SIF OUT
 of 
TU101 
and pin(2) of IC1701.
Check between IIC Data 
pins(26),(27) of IC701 and 
pins(12),(13) of IC1701.
NO
NO
Is there a base band signal at SIF 
OUT
 of 
TU101?
Is there a NICAM/IGR audio signal 
at pins(31), (30) of IC1701?
Is there a NICAM/IGR audio signal 
at pin(15),(16) of IC2501?
Is there a base band signal at 
pin(2) of IC1701?
Check line between pin(39), (40) of
IC2501 and pins(9), (14) of IC651.
See Flow Chart No.21 Hi-Fi SOUND 
MODE TROUBLESHOOTING 
(1)
For Hi-Fi model
Is 5V supplied at pins(1
1),(19),(1) of 
Check PC 5V line.
Is  MPX 8V supplied at pin(33) of IC1701?
Check the REG. circuit of D962.
Check PC Motor 12V line.
Check peripheral circuit of IC1701.
Replace IC1701.
Check serial data and clock at 
pin(12) and (13) of IC1701.
Is there oscillated 18.432MHz at 
pins(5), (6) of IC1701?
No NICAM/IGR sound.
52
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
FLOW CHART NO.27 DECODER TROUBLESHOOTING
SELECT
OUTPUT
INPUT
 SIGNAL
OUTPUT
 SIGNAL
<Hi-Fi 
Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SIG.
FLOW
INPUT
FLOW
(A)
Pin47 of IC701(Y/C video output
E2(L2) video input
Front video input
pin7
pin28
pin25
E1(L1) video output
21PIN CONNECT
OR
(B)
(C)
pin13
pin2
E1(L1) audio output (L-ch)
(A)
(B)
E2(L2) audio input(L/R-ch)
Pin54 of IC651(Audio output R-ch)
pin33
pin1
1
pin1                                                E1(L1) audio output(R-ch)
pin42
21PIN CONNECT
OR
(C)
(A)
(B)
E2(L2) audio intput(R-ch)
pin34
pin10
pin18                                              E2(L2) video output(L-ch)
pin43
21PIN CONNECT
OR
(C)
(A)
(B)
E1(L1) video input
Pin47 of IC701(Y/C video output)
pin23
pin7
pin16
pin26
21PIN CONNECT
OR
(C)
(A)
(B)
E1(L1) audio input(L-ch)
pin36
pin2
pin15
pin30
(C)
(A)
(B)
pin37
(
C)  
pin1
(A)     E2(L2) video input                                 
pin28
(B)     E1(L1) video input       
pin23
(C)     
T
uner video output                                  
pin18
(D)                         
pin13
(A)     E2(L2) audio input(L-ch)                    
pin33
(B)     E1(L1) audio input(L-ch)                    
pin36
(C)     MPX output(L-ch)                                 
pin16
(D)                                      
pin1
1
(A)     E2(L2) audio input (R-ch)                      
pin34
(B)     E1(L1) audio input (R-ch)       
pin37
(C)                                      
pin15
(D)                         
pin10
NO
NO
NO
YES
YES
YES
Check STBY
 5V line.
Check STBY
 12V line.
Check line between pins(21), (22) 
of  IC2501 and pins(17), (18) of 
IC701. 
Is there SDA
 and SCL
 signal 
applied to pins(21) and (22) of 
IC2501?
Is voltage 5V applied to the video 
section power terminal at pins(24), 
(29) of IC2501?
Is voltage 12V applied to the 
audio section power terminal at 
pins(14) 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.
Pin57 of IC651(Audio output L-ch)
T
uner video output
MPX output(L-ch)
Pin57 of IC651(Audio output(L-ch))
21PIN CONNECT
OR
E2(L2) audio output (L-ch)
pin31
E2(L2) audio output (R-ch)
21PIN CONNECT
OR
Pin31 of IC201
Y/C video input
(Aux. input)
Pin61 of IC651
(Aux. input
Pin52 of IC651
(Audio input (R-ch)
pin5
pin39
pin40
Front audio L-ch input
Front audio R-ch input
Front audio L-ch input
Front audio R-ch input
MPX output (R-ch)
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MPX output(R-ch)
Front video input
(switch)
  E1(L1) audio input(R-ch)       
Pin54 of IC651(Audio output R-ch)     
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