Aiwa HV-FX5850, HV-FX7800, GX1100, GX1400, GX1700 Service Manual
1-1
A AC :Alternating Current
ACC :Automatic Color Control
ACSS :Automatic Channel Setting System
ADJ :Adjust
A/E :Audio Erase
AFC :Automatic Frequency Control
AFT :Automatic Fine Tuning
AGC :Automatic Gain Control
A.H.SW :Audio Head Switch
ALC :Automatic Level Control
AM :Amplitude Modulation
AMP :Amplifier
ANT :Antenna
APC :Automatic Phase Control
ASS’Y :Assembly
AUX :Auxiliary
B B :Base
BGP :Burst Gate Pulse
BPF :Bandpass Filter
BS :Brodcasting Satellite
BW or B/W :Black and White
C C :Capacitor, Chroma, Collector
CAN :Cancel
CAP :Capstan
CAP.BRK :Capstan Brake
CAP.RVS :Capstan Reverse
CATV :Cable Television
CBA :Circuit Board Assembly
CCD :Charge Coupled Device
C.CTL :Chro Control, Capstan Control
CFG :Capstan Frequency Generator
CHROMA :Chrominance
CNR :Chroma Noise Redution
COMB :Combination
Comb Filter
COMP :Comparator
Composite
Compensation
CONV :Converter
C.ROT SW :Color Rotary Switch
CS :Chip Selcet
C.SYNC :Composite Synchronization
CTL DIV :Control Divide
CUR :Current
CYL :Cylinder
D D :Drum, Digital, Diode, Drain
D.ADJ :Drum Adjust
DC :Direct Current
D.CTL :Drum Control
DEMOD :Demodulator
DET :Detector
DEV :Deviation
DHP :Double High Pass
DIGITRON :Digital Display Tube
DL :Delay line
DOC :Drop Out Compensator
DUB :Dubbing
D.V SYNC :Dummy Vertical Synchronization
E E :Emitter
EE :Electric to Eletric
EMPH :Emphasis
ENA :Enable
ENV :Envelope
EP :Extended Play
EQ :Equalizer
EXP :Expander
F F :Fuse
FB :Feed Back
FBC :Feed Back Clamp
FE :Full Erase
FG :Frequency Generator
FL :Filter
FM :Frequency Modulation
F/R :Front/Rear
FS :Frequency Synthesizer
FSC :Subcarrier Frequency
F/V :Frequency Voltage
G GEN :Generator
H H :High, Horizontal
I IC :Integrated Circuit
IF :Intermediate Frequency
INS :Insert
L L :Low, Left, Coil
LD :LED
LD VTG CTL
:Loading Voltage Control
LECHA :Letter Character
L.M :Level Meter
LP :Long Play
LPF :Low Pass Filter
M MAX :Maximum
MD :Modulator
MECHA.CTL
:Mechanism Control
MIC :Microphone
MIN :Minimum
MIX :Mixer, Mixing
M.M. :Monostable, Multivibrator
MMV :Mono Multi Vibrator
MOD :Modulation, Modulator
MODEM :Modulator-Demodulator
MPX :Multiplex
N NR :Noise Reduction
O OSC :Oscillator
OSD :On Screen Display
P PB :Playback
PCB :Printed Circuit Board
P.CTL :Power Control
PRE-AMP :Preamplifier
P.F :Power Failure
PG :Pulse Generator
PLL :Phase Locked Loop
PREM.DET :Premire Detect
P.P :Peak-to-Peak
PS :Phase Shift
PWM :Pulse Width Modulation
PWR CTL :Power Control
Q Q :Transistor
QH :Quasi Horizontal
QSR :Quick Setting Record
QTR :Quick Timer Record
QV :Quasi Vertical
R R :Resistor, Right
RE(or RC) :Remocon, Receiver
REC :Recording
REC S ‘H’ :Record Start ‘Hight’
REF :Reference
REG :Regulated, Regulator
REMOCON :Remote Control(unit)
RF :Radio Frequency
R/P :Record/Playback
RTC :Reel Time Counter
S S :Serial
S.ACCEL :Slow Accel
SAOP :Second Audio Program
SC :Scart, Simulcast
S.DET :Secam Detect
SH :Shift
SHARP :Sharpness
SIF :Sound Intermediate Frequency
SLD :Side Locking
S/N :Signal to Noise Ratio
SP :Standard Play
ST :Stereo
SUB :Subtract, Subcarrier
SW or S/W :Switch
SYNC :Synchronization
SYSCON :System Control
T T :Coil
TP :Test Point
TR :Transistor
TRK :Tracking
TRANS :Transformer
TU :Tuner, Take-up
U UHF :Ultra High Frequency
UNREG :Unregulated
V V :Volt, Vertical
VA :Always Voltage
VCO :Voltage Controlled Oscillator
VGC :Voltage Gain Control
VHF :Very High Frequency
V.H.SW :Video Head Switch
VISS :VHS Index Search
VPS :Video Program System
VR :Variable Resistor or Volume
V-SYNC :Vertical Synchronization
VTG :Voltage
VV :Voltage to Voltage
VXO :Voltage X-tal Oscillator
W W :Watt
WHT :White
W/O :With out
X X-TAL :Crystal
Y Y/C :Luminance/Chrominance
YNR :Luminance Noise Reduction
Z ZD :Zener Diode
SECTION1 SUMMARY
KEY TO ABBREVIATIONS
1-2
Prior to shipment from the factory, the products are strictly inspected to confrom with the recognized product
safety and electrical codes of the countries in which they are to be sold. However , in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
• Precautions during Servicing
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and
certain parts of the product. When performing service, be sure to read and comply with these and other
cautionary notices appearing in the operation and service manuals.
2. Parts identified by the symbol and shaded (
Y
) parts are critical for safety.
Replace only with specified part numbers.
Note : Parts in this category also include those specified to comply with X-ray emission standards for
products using cathode ray tubes and those specified for compliance with various regulations
regarding spurious radiation emission.
3. Use Specified internal wiring. Note especially:
1) Double insulated wires
2) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulation sheets for transistor
5. Observe that wires do not contact heat producing
parts (heatsinks, oxide metal film resistors, fusible
resistors, etc.)
6. Check that replaced wires do not contact sharp edged
or pointed parts.
7. 1) When a power cord has been replaced, check
that A mark is made on the cord, under strain,
near the aperture, and the flexible cord is
subjected 100 times to a pull of 40N for a duration
of 1 second each.
2) During the test, the cord shall not be displaced by
more than 2mm
8. Also check areas surrounding repaired locations.
IMPORTANT SAFETY PRECAUTIONS
Fig. 1
Power code
1-3
Fig. 3
SAFETY CHECK AFTER SERVICING
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and
wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified
values in order to verify compliance with safety standards.
• Insulation resistance test
confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed
parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, incrophone jacks,
earphone jacks, etc.) See table below.
• Dielectric strength test
Confirm specified dielectric strength or greater between power cord prongs and exposed accessible parts of
the set (RF terminals, antenna terminals, video and
audio input and output terminals, incrophone jacks,
earphone jacks, etc.) See table below.
• Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic parts. See table below.
Table 1 : Ratings for selected areas
* Class II model only.
Note. This table is unofficial and for reference only. Be sure to confirm the precise values for your particular
country and locality.
• Leakage Current test
Confirm specified or lower leakage current between B(earth ground, power cord plug prongs) and externally
exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B(earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See figure and following table.
Table 2:Leakage current ratings for selected areas.
Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country and
Note. locality.
Fig. 2
AC Line Voltage
AC Line Voltage
100 to 130 V
200 to 240 V
*100 to 130 V
*200 to 240 V
Europe
Australia
Europe
Australia
Other terminals
Antenna earth
terminals
i E 0.7m Apeak
i E 2m ADC
i E 0.7m Apeak
i E 2m ADC
F 10 MΩ/500 V DC
4kV 1 minute
F 6mm(d)
F 8mm(d)
(a Power cord)
Region
Load Z Leakage Current(i)
Earth Ground
(B) to :
Region
Insulation
Resistance
Dielectric
Strength
Clearance
Distance(d),(d)
2k
Ω
50k
Ω
d
Primary circuit terminals
Chassis
a
Exposde
accessible
part
Load
Z
Earth Ground,
Power cord plug prongs
B
AC Voltmeter
1-4
• The Contents of Examination
As all the IC that is applied to VCR is controlled by IIC, mutual communication, if Vcc of IC is short or open
with detecting ‘Acknowledge’ data of the specific IC according to each power(5V, 5VT) µ -COM gets unable to
detect ‘ACK’ data.
µ-COM regards this case as abnormal one and if it can’t detect ‘ACK’ data for a certain time(3.5 sec) the signal of ‘Power Control’ and ‘Timer Control’ are switched to ‘Low’. As a result POWER Switching TR is kept from
generating heat and fire.
• POWER for each IC
S/ 5V POWER SECAM IC
Series 5VT POWER AVCP IC
P/Y/I 5V POWER Modulator
Series 5VT POWER AVCP IC
*Short protection off mode : DJ01 Diode in
PROPOSAL FOR APPLYING SHORT PROTECTION
IIC BUS
5VT SW
POWER
CONTROL
MASTER
TIMER
CONTROL
5VT SW
SLAVE with 5V
SLAVE with 5V
5.3VA
Timer Control
AVCP IC
TUNER
OSD
VPS IC
SECAM IC
Conception
BLOCK Diagram
5.2V 5.2VT
• IC to detect ‘ACK’ data is selected as below because IC is different in accordance to region and option
5.3VA
Power Control
Modulator
Hi-Fi IC
NICAM IC
1-5
In case that defective EEPROM of PAL models is replaced, to operate these sets from the initial state MP KEY
must be repaired as well before delivering to the customer.
If MP KEY isn’t repaired the setting of RF OUT channel or LANGUAGE might be different from that for custormer’s country.
•MP KEY : In case of PAL VCR if holding the REC button on the front panel and the CLEAR button on the
remote control handset for 5 ~ 7 seconds with power being switch all and no tapes,
OK is displayed at FLD for FLD models and LED becomes on for LED CLOCK models.
This is the state that initializing EEPROM is finished.
(In case of PAL VCP if holding the REC button on the front panel and the MENU button on the
remote control handset for 5 ~ 7 seconds with power being off and no tapes, All the LED DOTs
become on. This is the state that initializing EEPROM is finished.)
•MP KEY's function : MP KEY sets EEPROM's data up to the initial state.
SERVICE NOTICE ON REPLACING EEPROM
TIMER
AM
REC
VCR
OK
• FLD MODEL:
MP KEY “OK”
• LED CLOCK MODEL:
MP KEY Switch all on a Light
• LED DOT MODEL:
MP KEY Switch all on a Light
3-1
NICAM
SCART JACK
Hi-Fi
SYSTEM
DISPLAY(DOT,CLK)
AVCP
Micom
KEY-BOARD 2KEY-BOARD 1
T
U
N
E
R
OSC
H
S
R
VPS
L/D IC
Drum
Connector
Secam
W5J5
W5J4
H/SW
PG.ADJ
E2PROM
C
+
S
M
P
S
A/V
MAIN P.C.B (Component Side)
: Measurement point
: Adjustment point
SECTION 3 ELECTRICAL
ELECTRICAL ADJUSTMENT POINTS ARRANGEMENT
3-2
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
• Adjustment And Specification
a) OSCILLOSCOPE
b) PAL TEST TAPE (VHS SP)
MODE
PLAY
• Adjustment Procedure
a) Insert the PAL SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the
PAL SP Test Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(W5J4, W5J5) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Video Signal of CH2 to the CH1 H/SW(W5J4, W5J5), and then check the distance
(time difference), which is from the selected A(B) Head point of the H/SW(W5J4, W5J5) signal to the
starting point of the vertical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64.0µs).
• CONNECTION
• WAVEFORM
V.Out
H/SW(W5J4, W5J5)
VR501 6.5 ± 0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
VR501
H/SW(W5J4,W5J5)
OSCILLOSCOPE
CH1 CH2
V.outH/SW
(W5J4, W5J5)
H/SW
Composite
VIDEO
6.5H(416us)
3-20 3-21
BLOCK DIAGRAMS
1. Power Block Diagram
5.4VA
TO SYS, TU/IF
HOT CIRCUIT
BD101
R101
R102
R106
R115
C103
C113
C112
HOT GND
F101
WH
(BL)
BK
(BR)
PW101
6
7
8
9
10
3
2
4
3
11
12
1
2
IC102
IC103
4
T101
TRANSFORMER
4
2
3
1
RECTIFIER
& SMOOTHING
DRIVE & S/W BLOCK
OVER CURRENT LIMIT
BLOCK
+
TO Canal+
TO TU/IF
12VA
TO CAPSTAN M
24/12VA
33V
TO DRUM
12VA
5.2VT
TO AV, TU/IF,
SECAM, VPS
5.2V
TO Hi-Fi, Sensor
TIMER "H"
D152
D151
D160
SNUBBER
BLOCK
(IC101, R109, C135, D103,
R103,C109, R125, R126)
(D102,R104,
C105,C106)
(D109, C120,
L104,C121)
NOTES : Symbol denotes AC ground.
Symbol denotes DC chassis ground.
!
!
!
!
!
!
!
!
FROM µ-COM
FROM µ-COM
P.CTL"H"
LINE FILTER
BLOCK
(C101,L102,
C102)
RECTIFIER
& SMOOTHING
(D105, C115)
36V S/W
BLOCK
(Q154, R157,
R158,R155)
5VT SW
BLOCK
(Q152, R153,
R154, D156)
5V S/W
BLOCK
PWR CTL
BLOCK
Q163
(Q151, R151,
R152)
(Q162, R161)
FEED-BACK
BLOCK
(R116,R117,R118
R119,R120,R121
C114)
'00 11. 30
F. µ-com
SEARCH "H"
Q161
R163
24V S/W
Q159,R166,R167
RECTIFIER
& SMOOTHING
(D106, C116,
L103,C117)
RECTIFIER
& SMOOTHING
(D110, C123)
3-22 3-23
2. Tu/IF, NICAM & A2 Block Diagram
(From Power)
3-24 3-25
3. Y/C Block Diagram
1) PB Mode 2) REC Mode
ACC
C. COMB LPF
Y
DELAY
MAIN
CONV
C LPF
PB EQ
LPF
YNR
NL
DE EMP
Y/C
MIX
60dB AMP
CLAMP
DOUBLE
LIMIT
PB
PEAKING
MAIN
DE-EMPH
V.H S/W
CLOCK DATA C SYNC
V.OUT(TO MICOM)
V. OUT(TO VPS/PDC)
PB FM
AGC
FM
DEM
SUB
LPF
SP 'B' PB
SP 'A' PB
V. ENV
COLOR
ROTARY
88
5774 59 52 54 51 61 72 71
15 21
46
45
43
41
91
93
10 18 17 21 20 23 24 28 29
11
LP 'A' PB
PB
RF
LP 'B' PB
82
85
IC301
LA71598M
IC201 TA1238F
SP REC
IC 301
LA71598M
COLOR
ROTARY
V. II S/W CLOCK
DATA
C. SYNC REC 'H'
V.OUT(TO MICOM)
(TO DRUM)
90
LP REC
(TO DRUM)
84
71 72 61 51 52 54 57 59
46
45
43
41
38
36
34
32
31
302928242319181110
+
REC FM
EQ
FM
MOD
W/D
CLIP
MAIN
EMPH
AGC
FBC
NL EMPH
DETAIL
ENH
Y-LPF
YNR
BPF1
C. COMB
BPF
Y
DELAY
COMB
AMP
CCD
LPF
S/W
V. IN 1
V. IN 2
V. IN 3
24
15
IC201
TA1238F
S/W V.OUT
’00 11. 30 R10613A
4. System Block Diagram
3-26 3-27
3-28 3-29
5. Hi-Fi, SCART Block Diagram
1
2
3
4
5
6
7
8
9
10
13 16 17 19 20 21
353637
22
32
33
28 5
29
30
31 1
3
31
30
29
28
27
26
25
24
23
Audio input
Block
• Tuner
• F.A/V
• Scart1
• Scart2
Modulator
A.out
(To Tuner)
Scart 1
Audio Out
Scart 2
Audio Out
Normal A.out
(To AVCP)
Normal A.IN
(From AVCP)
Hi-Fi
PNR
Block
Hi-Fi
REC
Block
A
B
IC801
IC901
(From Tuner)
Tuner V.IN
V.OUT
(To AVCP)
V.IN
(From µ-COM)
Scart 2, V.IN
S2 V.IN
S1 V.IN
Scart 1, V.IN
Scart 1, V.OUT
Scart 2, V.OUT
3-30 3-31
CIRCUIT DIAGRAMS
1. Power, Tuner, NICAM/A2 Circuit Diagram
EE MODE(VIDEO)
EE/PB MODE (VIDEO)
TU MODE (AUDIO)
NOTES) Symbol denotes AC ground.
NOTES) Symbol denotes DC chassis ground.
NOTE) Warning
NOTE) Parts that are shaded are critical
NOTE) With respect to risk of fire or
NOTE) electricial shock.
BD101, R101 are defective.
Power dead.
F101 is defective.
Power dead.
IC101 is defective.
Switching dead.
D102 is defective.
No power.
D106 is defective.
No 5.3VAand 5VG, 5VT.
No 14VA, 12VA are 12VT.
D109, C120 are defective.
Q152 is defective.
No 5.2VT.
IC102, IC103 are defective.
Power dead.
NOTE :
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during TUNER mode.
BaseCollectorEmitter
PB RECPB RECPB REC
12.4
9.9
12.3
-27.0
0.0
-15.7
0.0
35.4
4.5
5.0
5.0
4.5
4.6
0.0
12.5
10.0
12.4
-26.6
0.0
-15.4
0.0
35.0
4.5
5.0
5.0
4.5
4.6
0.0
15.0
11.6
15.0
-27.8
5.3
-16.4
5.2
35.7
5.2
0.0
0.0
5.2
5.3
10.0
14.8
11.8
14.8
-27.3
5.2
-16.0
5.2
35.3
5.2
0.0
0.1
5.2
5.3
10.0
11.8
9.3
11.7
-27.9
5.3
-16.5
5.3
36.0
5.3
0.0
0.0
5.3
5.3
0.0
11.9
9.4
11.8
-27.3
5.3
-16.1
5.3
35.6
5.3
0.0
0.0
5.3
5.3
0.0
Q151
Q152
Q153
Q154
Q155
Q156
Q157
Q158
Q159
Q160
Q161
Q162
Q164
Q165
__
TR Voltage Sheet
IC101
1
5
PB
REC
16.1
16.3
4.0
4.6
PB
REC
309
309
0.0
0.0
0.0
0.0
IC102
1
4
PB
REC
4.0
4.0
0.0
0.0
PB
REC
4.9
4.9
3.9
4.0
BaseCollectorEmitter
PB RECPB RECPB REC
3.93.9
0.0
0.02.52.5IC103
* IC103 Voltage Sheet
* IC101 Voltage Sheet * IC102 Voltage Sheet
3-32 3-33 3-34
2. A/V, SECAM, VPS Circuit Diagram
9
1
3 6
2
2
7
16
12
13
8
11
5
4
15
14
10
REC SECAM COLOR
PB AUDIO(MONO)
PB Y+C
PB Y
PB C
REC Y+C
REC Y
REC C
PB SECAM COLOR
REC AUDIO
WAVEFORM
Audio Tracking is failed.
IC301 Pin 93 is defective.
PB COLOR Signal disappear.
IC301 Pin 10 is defective.
EE, PB Screen doesn’t appear.
Q305 is defective.
REC is failded.
D301 or IC301 Pin30 is defective.
PB Screen is bad.
Q301, 302 are defective.
PB COLOR Signal disappear.
X301 is defective.
PB and Recording is failed.
(IC301 doesn’t operate.)
IC301 Pin 23, 24 are defective.
Normal Audio signal is not recorded.
FL301, Q309, Q311 are defective.
No mono Audio Signal
in PB MODE.
Q308, Q309, Q310
are defective.
WAVEFORM & VOLTAGE SHEET
IC301 Pin 20
PB mode
500mvp-p
IC301 Pins 38,32,31
Video in
1Vp-p
IC301 Pin 28
PB/REC mode
4.2Vp-p
IC301 Pin 7
REC mode
1.4Vp-p
IC301 Pin 6
REC mode
2.2Vp-p
IC301 Pin 29
PB mode
2.1Vp-p
IC301 Pin 41
PB mode
400mVp-p
IC301 Pin 64
PB mode
600mVp-p
IC301 Pin 23
PB/REC mode
5Vp-p
IC301 Pin 24
PB/REC mode
5Vp-p
IC301 Pins 71 , 72
REC mode
340mVp-p
IC301 Pins 51, 52,54
PB mode
300mVp-p
IC301 Pin 63
PB mode
600mVp-p
IC301 Pin 11
PB mode
3.2Vp-p
IC301 Pin 10
PB mode
1.8Vp-p
IC301 Pin 43
PB mode
400mVp-p
__
IC301 Voltage Sheet
__
IC301 Oscilloscope Waveform
PB RECPIN PIN PIN PIN PINPB REC PB REC PB REC PB REC
2.44
2.44
2.46
2.45
0.09
2.46
2.46
0
0
0.93
1.68
4.98
1.49
1.68
2.34
5.01
3.08
1.98
1.18
3.01
2.42
2.42
2.44
2.35
0.88
2.34
2.34
0
0
0.93
1.68
2.60
1.52
1.38
2.32
5.02
0.15
2.45
2.45
3.05
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
2.41
0
4.48
4.19
1.69
0.05
0.34
0.34
1.78
1.10
2.97
-
1.45
1.81
3.25
1.82
4.79
1.81
4.10
5.00
2.52
0
4.52
4.23
1.69
0.06
0.34
0.34
1.84
4.57
2.94
2.3
1.37
1.79
3.22
1.95
4.79
2.25
4.10
5.00
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
2.93
3.16
3.02
0
2.34
1.46
9.13
1.94
0.85
0
1.83
2.71
0
2.62
4.91
0.56
3.44
5.00
3.36
3.31
2.92
3.14
2.05
0
2.33
1.44
9.12
1.96
0.85
0
1.82
2.62
0
2.62
4.91
0.57
3.44
5.00
3.37
3.31
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
3.43
3.31
5
5
2.03
2.66
3.87
0
0.80
1.98
2.52
3.37
3.8
1.55
4.96
2.43
0.01
2.42
2.46
2.43
3.43
3.32
5
5
2.03
2.67
3.86
0
1.27
2.92
2.51
1.73
3.17
0.01
4.94
2.41
0.14
2.42
2.45
2.23
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
0
0.03
0
0.03
0.03
0
4.87
1.83
0
1.83
1.83
0.02
2.17
0
0
2.29
0
2.43
5.08
2.43
0
0.04
0
0.03
0.03
0
4.80
3.97
0
3.95
3.98
1.55
0.01
2.01
0
2.38
0
2.41
4.28
2.60
__
TR Voltage Sheet
REC modePB mode
CBBEEC
1.213
1.548
2.161
1.217
2.383
1.222
5.258
0
0
5.256
1.224
0
1.313
1.314
0
3.930
5.158
0
5.061
0
0
0.280
0
0
5.180
3.923
5.251
5.135
5.135
1.924
1.864
2.191
1.499
1.835
1.705
0.545
5.176
0.744
0.720
4.583
1.872
0
1.924
1.237
0.016
1.783
1.813
2.147
1.216
2.420
1.221
5.186
15.624
-5.69
5.189
0.271
1.258
0.625
0.624
0
3.348
5.147
0
5.039
0
0
3.301
0
0
-21.64
3.190
5.179
5.116
5.120
0.092
2.435
2.452
1.494
1.824
1.749
0.557
4.352
-21.49
-21.77
5.148
0.688
1.756
0.092
1.219
5.111
Q301
Q302
Q303
Q304
Q305
Q306
Q307
Q308
Q309
Q310
Q311
Q3A1
Q201
Q202
Q203
CBBEEC
2.239
4.794
3.099
4.264
5.196
4.315
4.652
0.001
0.360
0.048
3.262
1.794
2.238
4.823
3.098
4.260
5.192
4.163
4.554
0.001
0.358
0.050
3.261
1.813
2.216
4.731
3.066
4.216
5.137
4.231
4.467
0.001
0.359
0.059
3.236
1.803
3.574
4.442
1.946
3.199
5.150
2.798
2.215
0.002
2.615
2.780
3.387
2.549
3.565
4.438
1.923
3.2
5.138
2.857
2.938
0.002
2.613
2.802
3.324
2.554
3.567
4.396
0.093
3.176
5.120
2.701
2.203
0.002
2.603
2.701
3.356
2.538
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
__
IC201 Voltage Sheet
3-363-35 3-37
3. System Circuit Diagram
9
8
765
4
3
2
1
10
WAVEFORM
IC502, ZD501 are defective.
LD Motor will not operate.
Q501, Q503 are defective.
µ-COM is unstable.
IC505 is defective.
VCR dead.
X501, X502 are
defective.
µ-COM will not
opreate.
VR501 is defective.
PB PG will not operate.
RS501, RS502, Q514,
Q515 are defective.
Auto stop occures.
ES501, ES502, LD501
are defective.
•Tape mode not Working.
(Tape remaining on reel.)
•Auto Rew not working.
R575, R576, R577, R578
are defective.
Deck will not operater.
IC504 is defective.
Reset is defective.
Set dead.
* IC501 Waveform Photographs
IC501 Pin 24
1V/5mS
REC/PB modes
(V.H/SW)
IC501 Pin 27
1V/2mS
QUE/REV modes
(D.V-SYNC)
IC501 Pin 31
1V/10mS
REC mode
(CTL+)
IC501 Pin 32
1V/10mS
REC mode
(CTL-)
IC501 Pin 38
1V/1mS
REC/PB mode
(DFG)
IC501 Pin 39
1V/10uS
REC/PB modes
(DPG)
IC501 Pin 40
1V/1mS
REC/PB modes
(CFG)
IC501 Pin 43
100mV/10uS
EE/PB modes
(V-IN)
IC501 Pin 45
500MV/10uS
EE/PB modes
(V-OUT)
IC501 Pin 54
1V/20uS
EE/PB modes
(C-SYNC)
BaseCollectorEmitter
PB RECPB RECPB REC
H/L
H/L
0.4
4.43
0.75
H/L
H/L
0.4
4.43
0.75
H/L
H/L
0.7
5.24
0
H/L
H/L
0.7
5.25
0
0
0
0
5.32
0
0
0
0
5.32
0
Q514
Q515
Q506
Q503
Q501
__
System IC Voltage Sheet
IC503
1
5
PB
REC
5.34
5.34
0.00
0.00
4.60
5.21
4.60
5.21
PB
REC
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
__
IC503 Voltage Sheet
PB REC PB REC PB REC PB REC PB REC
0
0
0.78
H/L
H/L
3.34
1
1
3.2
2.2
0.74
4.0
5.28
5.28
5.28
5.24
0
0
5.18
5.18
0
0
0.79
H/L
H/L
3.3
2
2
1.62
2.2
0
2.3
5.28
5.28
5.28
5.28
0
0
5.18
5.18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
5.24
5.24
H/L
H/L
2.81
2.73
0
H/L
5.15
4.97
2.25
2.25
0
0
2.25
2.25
2.25
Pulse
Pulse
Pulse
5.24
5.24
H/L
H/L
2.81
2.73
0
H/L
5.15
4.88
2.99
2.2
0
0
2.25
2.25
2.25
Pulse
Pulse
Pulse
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
5.24
4.99
2.41
1.36
2.43
0
2.01
1.41
0
1.32
1.35
2.5
2.43
0.38
5.21
0
5.05
5.16
0
5.21
5.24
4.99
2.37
1.36
2.43
0
2.01
1.41
0
1.32
1.35
2.5
2.43
0.38
5.21
0
5.05
5.20
0
5.14
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
0
0
0
5.21
5.21
0
4.58
0
1.45
0.83
0
2.49
2.47
5.29
0
5.29
2.29
3.14
0
2.8
0
0
0
5.21
5.21
0
4.58
0
1.45
0.83
0
2.47
2.47
5.29
0
5.29
5.29
3.15
4.84
2.8
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
2.55
5.07
0
0
0
0
4.7
0
4.87
5.08
5.03
5.28
5.28
4.6
5.2
0
0
0
0
0
2.55
5.07
0
0
0
0
4.7
0
4.87
5.08
5.03
5.28
5.28
4.6
5.2
0
0
0
0
0
__
SYSTEM IC Voltage Sheet
• IC501(HD3977)
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