JVC HR-XV2EK Service Manual
SERVICE MANUAL
DVD PLAYER / VIDEO CASSETTE RECORDER
HR-XV2EK
POWER
VCR DVD
TV
DVD MENU MEMORY
SUBTITLE ANGLE
DISPLAY
REPEAT A-B ZOOM
123
456
7089
AUX
AUDIO
MONITOR
SEARCH
EJECT
RETURN
REPEAT
TITLE
SHOWVIEW
VIDEO Plus+
TV
TV
TV/VCR
TV/VCR PR +
OK
0000
CANCEL
RANDOM
TV/VCR PR
.
PROG
PAL
SPECIFICATIONS
General
Power requirements AC 200-240V, 50/60 Hz
Power consumption Operation mode : 23W
Dimensions (approx.) 430 X 97.5 X 293 mm (w/h/d)
Mass (approx.) 4.8 kg
Operating temperature 5˚C to 35˚C (41˚F to 95˚F)
Operating humidity 5 % to 90 %
Timer 24 hours display tape
Program capacity 1 month 7 program
RF Modulator UHF 22-68 (Adjustable)
System
Laser Semiconductor laser, wavelength 650 nm
Video Head system Double azimuth 4 heads, helical scanning.
Signal system PAL
Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz
Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only)
Harmonic distortion Less than 0.008%
Dynamic range More than 100 dB (DVD)
Inputs (VCR)
Audio -6.0dBm, more than 10 kohms (SCART)
Video 1.0 Vp-p, 75 ohms, unbalanced (SCART/RCA)
Standby mode : 6.7W
DVD (PCM 48 kHz): 8 Hz to 22 kHz
CD: 8 Hz to 20 kHz
More than 95 dB (CD)
-6.0dBm, more than 47 kohms (RCA)
Outputs (DVD)
S-VIDEO OUT (Y) 1.0 Vp-p 75 ohms, negative sync., Mini Din 4-pin x 1
(C) 0.3 Vp-p 75 ohms
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1
Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
Audio output (optical audio) 5 V (p-p), 75 Ω, Optical connector x 1
Audio output (analog audio) 2.0 Vrms (1 kHz, 0 dB), 330 Ω, RCAjack (L, R) x 2/SCART(TO TV)
Outputs (VCR)
Audio -6.0dBm, less than 1 kohms (SCART)
Video 1.0Vp-p, 75 ohms, unbalanced (SCART)
Design and specifications are subject to change without notice.
Manufactured under license from Dolby Laboratories. “ Dolby” and double-D symbol are trademarks of
Dolby Laboratories. Confidential Unpublished Works. ©1992-1997 Dolby Laboratories, Inc. All rights reserved.
Manufactured under license from Digital Theater Systems, Inc. US Pat. No. 5,451,942 and other world-wide patents issued and
pending. “ DTS” and “ DTS Digital Out” are trademarks of Digital Theater Systems, Inc. Copyright 1996 Digital Theater Systems, Inc.
All rights reserved.
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD
HR-XV2EK D2VP11
No.82985
2003/06
CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . MECHANISM OF VCR PART
SECTION 5 . . . . MECHANISM OF DVD PART
SECTION 6 . . . . REPLACEMENT PARTS LIST
SECTION 1
SUMMARY
CONTENTS
Safety Precautions
SPECIFICATIONS ................................................................................................... 1-5
Safety Precautions
1. This design of this product contains special hardware and many circuits and components specially
for safety purposes. For continued protection, no changes should be made to the original
design unless authorised in writing by the manufacturer. Replacement parts must be identical to
those used in the original circuits.
2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; furthermore the
manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom.
3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the
schematics, and must never be replaced by parts other than those listed in the manual. please note
however that many electrical and mechanical parts in the product have special safety related
characteristics. These characteristics are often not evident from visual inspection. Parts other than
specified by the manufacturer may not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of the Service manual and may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the
like to be separated from live parts, high temperature parts, moving parts and/or sharp edges
for the prevention of electric shock and fire hazard. When service is required, the original lead
routing and dress should be observed, and it should be confirmed that they have been returned
to normal, after re-assembling.
Warning
1. Service should be performed by qualified personnel only.
2. This equipment has been designed and manufactured to meet international safety standards.
3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
4. Repairs must be made in accordance with the relevant safety standards.
5. It is essential that safety critical components are replaced by approved parts.
6. If mains voltage selector is provided, check setting for local voltage.
S40892-01
SPECIFICATIONS
DVD PART
Power supply AC 110~240V, 50/60 Hz(HR-XV2ER)
AC 200~240V, 50/60 Hz(HR-XV2EX/HR-XV2EY/
HR-XV2EL/HR-XV11EX/ HR-XV2EK/HR-XV2EF/HR-XV2EZ)
Power consumtion 23W
Mass 5.4kg
External dimensions 430 x 97.5 x 293 (W x H x D)
Signal system PAL 625/50
Laser Semiconductor laser, wavelength 650nm
Frequency range (digital audio) 4 Hz to 20 kHz
Signal-to-noise ratio (digital audio) More than 100 dB (EIAJ)
Audio dynamic range (digital audio) More than 95 dB (EIAJ)
Harmonic distortion(digital audio) 0.008%
Wow and flutter Below measurable level (less than +0.001%(W.PEAK)) (EIAJ)
Operations Temperature : 5˚C(41˚F) to 35˚C(95˚F),
Operation status : Horizontal
OUTPUTS
Video outputs .0V(p-p), 75Ω, negative sync., RCA jack x 1/SCART(TO TV)
S video outputs
Component video output (Y) 1.0 V (p-p), 75 Ω, negative sync., RCA jack x 1
Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1/SCART(TO TV)
Audio output(optical audio) Optical connector x 1
Audio output(analog audio) 2.0Vrms (1kHz, 0dB), 330Ω, RCAjack (L, R) x 1/
VHS PART
Video Head System Double azimuth 4 heads, helical scanning
Tape format Tape width 12.7 mm (0.5 inch)
Timer 24 hours display type
*Designs and specifications are subject to change without notice.
*Weight and dimensions shown are approximate.
1
(Y)1.0V(p-p), 75Ω, negative sync.,Mini DIN 4-pin x 1
(C)0.3V(p-p), 75Ω
(Pb)/(Pr) 0.7 V (p-p), 75 Ω
SCART(TO TV)
1-5
SECTION 3
ELECTRICAL
CONTENTS
OVERALL BLOCK DIAGRAM
.............................3-2
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES
..........................................................3-3
ELECTRICAL TROUBLESHOOTING
GUIDE
BLOCK DIAGRAMS
CIRCUIT DIAGRAMS
...........................................................................3-4
1. POWER(SMPS) CIRCUIT.......................................3-4
2. SYSTEM/KEY CIRCUIT ..........................................3-7
3. SERVO CIRCUIT.....................................................3-8
4. Y/C CIRCUIT..........................................................3-11
5. Hi-Fi CIRCUIT .......................................................3-15
6. Tuner/IF CIRCUIT.................................................3-18
..............................................3-20
1. Power(SMPS) BLOCK DIAGRAM .......................3-20
2. Tu/IF, NICAM & A2 BLOCK DIAGRAM................3-22
3. VPS BLOCK DIAGRAM........................................3-23
4. Y/C BLOCK DIAGRAM.........................................3-24
5. Hi-Fi BLOCK DIAGRAM.......................................3-26
6. SYSTEM BLOCK DIAGRAM................................3-28
............................................3-30
1. Power(SMPS) CIRCUIT DIAGRAM......................3-30
2. TU/IF, NICAM & A2 CIRCUIT DIAGRAM .............3-32
3. A/V CIRCUIT DIAGRAM .......................................3-34
4. Hi-Fi CIRCUIT DIAGRAM.....................................3-36
5. SCART(JACK) CIRCUIT DIAGRAM ....................3-38
6. SYSTEM CIRCUIT DIAGRAM ..............................3-40
• WAVEFORM & VOLTAGE SHEET.........................3-42
• CIRCUIT VOLTAGE CHART...................................3-44
DVD PART
ELECTRICAL TROUBLESHOOTING
GUIDE & WAVEFORMS
1. System Clock X501 (27Mhz) ...............................3-52
2. Initializing between MPEG and SDRAM ............3-52
3. Initializing between MPEG and Flash ................3-53
4. Reference Voltage 1.............................................3-53
5. Reference Voltage 2.............................................3-54
6. Checking the initial step of M/D Ass’y...............3-54
7. Checking the Video Signal..................................3-55
8. Checking the first step of servo (1) ...................3-55
9. Checking the second step of servo (2) .............3-56
10. Checking the output of Audio signal ...............3-56
11. Checking the reset port.....................................3-57
12. Checking the focus & tracking servo..............3-57
13. Checking the track jump...................................3-58
14. The status of CD_LD and DVD_LD in the
PLAY MODE........................................................3-58
15. The status Focus and spindle motor ...............3-59
16. DATA STREAM ...................................................3-59
17. Input Clock to IC202..........................................3-60
18. Tray Open and Close.........................................3-60
19. Focus Drive signal(FACT) .................................3-61
20. Signals for Front micom ...................................3-61
21. FACT and FE for DVD9 (Dual disc)..................3-62
22. System clock of MPEG IC.................................3-62
BLOCK DIAGRAMS
1. DVD Overall Block Diagram................................3-63
2. SERVO Block Diagram........................................3-64
3. MPEG Block Diagram..........................................3-65
4. AUDIO Block Diagram .........................................3-66
.......................................3-52
..............................................3-63
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD .................................................3-48
2. SMPS P.C.BOARD ...............................................3-50
.......................3-48
CIRCUIT DIAGRAMS
1. RD SERVO CIRCUIT DIAGRAM..........................3-67
2. SYSTEM CIRCUIT DIAGRAM ..............................3-69
3. AUDIO CIRCUIT DIAGRAM..................................3-71
4. INTERFACE CIRCUIT DIAGRAM.........................3-73
• CIRCUIT VOLTAGE CHART...................................3-75
PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD (TOP VIEW)............................3-79
2. MAIN P.C.BOARD (BOTTOM VIEW) ....................3-81
............................................3-67
.......................3-79
3-1
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
VCR PART
•Test Equipment
a) OSCILLOSCOPE
b) NTSC MODEL : NTSC SP TEST TAPE
C) PALMODEL : PAL SP TEST TAPE
• Adjustment And Specification
MODE
PLAY
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
H/SW
R/C TRK JIG KEY 6.5 ± 0.5H
• Adjustment Procedure
a) Insert the SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the
SP Test Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW and CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW, and then check the distance (time dif-
ference), which is from the selected A(B) Head point of the H/SW signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs).
• PG Adjustment Method
a-1) Payback the SP standard tape
b-2) Press the “1” key on the Remote controller and the “PLAY” key on the Front Panel at the same time,
then it goes into Tracking initial mode.
c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically.
d-4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data.
• CONNECTION
• WAVEFORM
H/SW
T/P
H/SW
Composite
VIDEO
V.Out
OSCILLOSCOPE
CH1 CH2
R/C KEY
V.outH/SW
6.5H(412us)
3-3
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
(1) No 5.3VA (SYS/TUNER)
NO 5.3VA.
YES
Is the F101 normal?
YES
Is the BD101
NO
NO
normal?
YES
Is the R101
NO
normal?
YES
Is Vcc(8.5~21V) sup-
NO
plied to IC101 Pin7?
YES
Replace the F101.
(Use the same Fuse)
Replace the
BD101.
Replace the R101.
Is the D102
normal?
NO
Check or Replace
the D102.
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 12VA.
YES
Is the Vcc(13V) supplied
NO
to (+) terminal in D115?
YES
Is the Vcc(12V) supplied
NO
to (-) terminal in D115?
YES
Check or Replace
the D110.
Replace the D115.
Check or Replace
the Motor Vcc.
(3) No 5.0V (SYS, Hi-Fi, TUNER, Y/C)
Is the D112 normal?
YES
Is there about 2.5V
at the IC103 Vref?
YES
Check the Main PCB
5.3VA/5.0V Line short?
NO
NO
Replace the D112.
Replace the IC103.
NO 5.0VA.
YES
Is 5.3VA put into
the Q160 Emitter?
YES
Is the Q162 Base
“H”?
YES
Is about 5V put into
the Q160 Base?
YES
Check or Replace
the Q162/Q160.
NO
NO
NO
5.3VA Line Check.
Check the Power
Control.
Check or Replace the Q162,
R157, R158, R159, D121.
3-4
(4) No 5V (TO DVD)
(5) No 33V (TUNER)
NO 5V.
YES
Is 5.3VA put into
the Q160 Emitter?
YES
Is the Q162 Base
“H”?
YES
Is about 5V put into
the Q160 Base?
YES
Check or Replace
the Q162/Q160
(6) No REG 12V
NO
NO
NO
5.3VA Line Check.
Check the Power
Control.
Check or Replace the Q162,
R157, R158, R159, D121.
No 33V.
YES
Is Q162 Base “H”?
YES
Check or Replace
Q161, R154, R155.
NO
Check the Power
Control.
No REG 12V.
YES
Is 13V put into the
NO
Q156 Collector?
YES
Is 13V put into the
NO
R153 Base?
YES
Check or Replace the Q156,
ZD103, R153, C151.
Check or Replace
D110.
Check 33V Line.
3-5
(7) No 8V(TO DVD)
(8) No 3.3V(TO DVD)
NO 8V.
YES
Is Vcc(13V) supplied to
(+) terminal in D114?
YES
Is Vcc(12V) supplied
to IC151 Pin1?
YES
Is the Q162 Base
“H”?
YES
Check or Replace
IC151, R170, C154.
NO
NO
NO
Check or Replace
the D110.
Check or Replace
the D114.
Check the Power
Control.
NO 3.3V.
YES
Is Vcc(4V) supplied
to IC152 Pin1?
YES
Is the Q162 Base
“H”?
YES
Check or Replace
IC152, R156, C153.
NO
NO
Check or Replace
the D111.
Check the Power
Control.
3-6
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
YES
Does the SW25 waveform
appear at the IC501
Pin105?
YES
Do the T-UP Reel Pulses
appear at the IC501 Pin49?
YES
Replace the IC501.
NO
NO NO
Check the Drum Motor
signal.
Do T/UP Reel Pulses
appear at the Q514
Base terminal ?
YES YES
Replace the T/UP Reel
Sensor (RS501).
(2) The unstable loading of a Cassette tape
The unstable loading of a
Cassette tape
YES
Does 5.2V appear at the
RS501?
NO
Check the Power Circuit.
Is 12V applied to the
PMC01 Pin8?
YES
Does the “H” signal appear
at the IC501 Pin30 during
inserting the CST ?
YES
Does the “L” signal appear
at the IC501 Pin72 during
inserting the CST?
YES
Check the Deck
Mechanism.
Caution :
Auto stop can occur because Grease or Oil is dried up
NO
NO
NO
Check the CST SW and
the peripheral circuitry.
3-7
Check the Power.
Is 5.3V applied to the
R544 ?
YES
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins68, 69, 70, 71.
NO
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
YES
Does the Noise level of the
screen change
periodically?
YES
Do the CTL pulses appear
at the IC501 Pin8?
YES
Does the CFG waveform
appear at the IC501
Pin9?
YES
On tracking do the CTL
pulses move?
YES
Does the Video Envelope
waveform appear at the
IC501 Pin24?
YES
Replace the IC501.
(2) When the Drum Motor
(2) doesn’t run.
When the Drum Motor
doesn’t run,
Does 12V appear at the
PMC01 Pin8?
NO
NO
NO
NO
Is adjusting the height of
the CTL Head accurate?
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin107?
YES
Aren’t the foil patterns and
the Components between
IC501 Pin107 and PMC01
Pin12 short?
NO
Readjust the height of the
CTL Head.
NO
Do the DFG Pulses appear
at the PMC01 Pin11?
YES
NO
Replace the Cap M.
YES
Does 2.8V appear at the
PMC01 Pin12?
YES
Check the connector
(PMC01) and the Drum
Motor Ass’y .
NO
Do the DFG Pulses appear
at the IC501 Pin104?
YES
Do the Drum PWM Pulses
appear at the IC501
Pin107?
YES
Aren’t the connecting patterns and the Components
between IC501 Pin107 and PMC01 Pin12 short?
3-8
NO
NO
Aren’t the foil patterns and
the Components between
IC501 Pin104 and PMC01
Pin11 short?
Replace the IC501.
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,
When the Capstan Motor doesn’t run,
Does 12VA appear at the PMC01?
YES
Does 2.8V appear at the PMC01?
YES
Check the PMC01 and the Capstan
Motor Ass’y .
Aren’t the foil patterns and Components
between IC501 Pin108 and PMC01
Pin9 short?
Does the CFG signal come into the
IC501 Pin9?
NO
NO
YES
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Does the PWM signal appear at the
IC501 Pin108?
NO
Does the CFG signal appear at the
PMC01 Pin1?
NO
Check the Capstan Motor Ass’y.
YES
Does the Capstan PWM signal appear at
the IC501 Pin108?
YES
Aren’t the foil patterns and Components
between IC501 Pin108 and PMC01
Pin9 short?
NO
Aren’t the foil patterns and component
between IC501 Pin9 and PMC01
Pin1 short?
NO
Replace the IC501.
3-9
(4) KEY doesn’t working
KEY doesn’t working.
Is 5V applied to the IC501
Pin36?
YES
Does LED or FLD change
when a function button is
pressed?
NO
NO
Refer to “SMPS 5.3VA
Trouble Shooting”.
Replace the defective
switches.
3-10
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal
appear at the IC301 Pin15?
YES
Is 5V applied to the IC301
Pins4, 22, 47, 60, 84?
YES
Does the Video signal
appear at the IC301 Pin29?
YES
Does the Video signal
appear at the IC501 Pin19?
YES
Does the Video signal
appear at the Emitter terminal of the Q805?
NO
NO
NO
NO
NO
Check the 24Pin of Tuner.
Check the 5.2VT, 5.3VA
Line. (Power Circuit)
Is I2C BUS signal applied to
the IC301 Pins73, 74?
YES
Chck the path of the signal
between the IC301 Pin29
and IC501 Pin17.
Does the 12VT, 5.4VA
appear at the Emitter terminal of the Q805.
NO
NO
Check the System Circuit.
(Refer to ‘SYSTEM I
CHECK Trouble Shooting’)
Check C327. (AGC)
Replace the IC301.
YES
2
C BUS
YES
Replace the Q805.
3-11
Check the 12VT, 5.4VA
Line. (Power Circuit)
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5.2VT, 5.3VA applied to the
IC301 Pins22, 47, 60, 84?
YES
Is the I2C Bus siganl applied
to the IC301 Pins73, 74 ?
YES
Does the normal RF signal
appear at the IC301 Pin76?
YES
NO
NO
NO
Check the line of the 5.2VT,
5.3VA Line. (Power Circuit)
Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’.
Is the V.H.S/W signal
applied to the IC301 Pin80?
YES
Is V.H.S/W “H” about 3.4V
at the IC301 Pin80?
YES
Clean the Drum.
NO
NO
NO
Check the System Circuit.
(IC501 Pin105)
Check the V.H.S/W level.
(Check R335)
Replace the IC301.
Does the Y(Luminance) RF
signal appear at the IC301
Pin9?
YES
Is the Y(Luminance) Video
waveform showed up at
theIC301 Pins49, 40?
YES
Replace the IC301.
NO
Check the path of the
Y(Luminance) RF signal.
(Check C337, C340)
YES
3-12
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is 5.2VT/5.3VA applied to the
IC301 Pins22, 47, 60, 84?
YES
Does the Color signal
appear at the IC301
Pin57 ?
YES
Replace the IC301.
NO
NO
Check the line of the 5.2VT/
5.3VA Line. (Power Circuit)
Does the X301(4.43MHZ)
oscillate?
Does the Color signal
appear at the IC301 Pin55?
YES
Replace the IC301.
NO
NO
Replace the X301.
Check the Color Pass.
3-13
3. Y/C CIRCUIT
(4) When the Video signal doesn’t appear on the screen in REC Mode,
Is the EE signal normal?
YES
Is 5.2VT/5.3VA applied to the
IC301 Pins4, 22, 47, 60, 84
YES
Does PB Mdoe operate
normally?
YES
Does the RF signal appear
at the IC301 Pin76?
YES
NO
NO
NO
NO
Check EE Mode.
Check the line of the 5.2VT/
5.3VA Line.(Power Circuit)
Check PB Mode.
Is the REC ‘H’ signal
(about 4V) applied to the
IC301 Pin80?
YES
Check REC Luminance
Pass & Color Pass.
NO
YES
Check the System of REC
‘H’. (the IC501 Pin47)
Replace the IC301.
Does the REC RF signal
appear at the IC301
Pins80, 90?
YES
Check the Drum &
Drum Connector
3-14
5. Hi-Fi CIRCUIT
(A) No Sound(EE Mode)
No Sound.
YES
Check the TU Audio of IC801
Pins2, 3.
Check the DVD Audio of IC801
Pins4, 5.
Check the AV1 Audio of IC801
Pins6, 7.
Check the AV2 Audio of IC801
Pins8, 9.
Check the AV3 Audio of IC801
Pins10, 11.
Check the Vcc of IC801 Pins34, 40,
IC803 Pin13.
NO
NO
NO
NO
NO
YES
NO
Check the IC751 Pins30, 31.
Check the DVD MODULE.
(PMD02 Pins13, 15).
Check the Scart1 Jack.
(SC901 Scart1 Audio in Pins2, 6).
Check the Scart2 Jack.
(SC901 Scart2 Audio in Pins2, 6).
Check the front Jack.
(L5F1, L5F2).
Check the Power 5.2V, 12VT.
YES
Check the IIC Clock and DATA at
IC801 Pins42, 43.
YES
Check the Audio of IC801 Pins16, 17.
YES
Check the Audio of IC803 Pins3, 5.
YES
Check the JK902.
NO
Check the IC501 Pins59, 60.
NO
Replace IC801.
NO
Replace IC803.
3-15
3. Y/C CIRCUIT
(B) Hi-Fi Playback
PB mode
No Sound.
YES
YES
Check the Vcc of IC801
(Pins34, 40)
YES
Check the Hi-Fi Selection switch.
(IC801 Pin41) and the Tape quality.
YES
Is the RF Envelope at
IC801 Pin44 over 2Vp-p?
YES
Check IC801 Pin42(Data),
Pin43(Clock)
YES
Do Audio Signals appear at
IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at
IC803 Pin16(L-CH), 11(R-CH)?
YES
NO
NO
NO
NO
NO
NO
Check Power 5.2V, 12VT.
Check IC501 Pin106
(A.H/SW)
Check the parts of µ-COM
(IC501 Pins59, 60)
Check the Connection at
P3D01 Pins7, 9.
Check the A.IN line of
IC803(C837, C838)
Do Audio Signals appear at
IC803 Pins3, 5?
YES YES
Do Audio Signals appear at
JK902?
NO
NO
Check the Vcc of IC803
Pin13.
Replace IC803.
Check the Jack(JK902)
3-16
NO
Check Power.
(C)
Hi-Fi REC.
YES
It can’t be recorded Hi-Fi Audio
signal.
YES
Check Vcc of IC801.(Pins34, 40)
YES
Check IC801 Pin42(Data), Pin43(CLOCK).
YES
Do Audio signals appear at IC801
Pins16, 17?
YES
Do FM Audio signals appear at IC801
Pin36?
YES
Check the Contact Point of Drum
Connector if good then Replace the Drum.
NO
NO
NO
NO
Check Power 5V, 12VT.
Check ports of µ-COM.
(IC501 pins 59, 60)
Check Audio input signal of IC801
Pins2, 3(TU.A.), 4, 5(DVD.A.),
6, 7(AVI.A.), 8, 9(AV2.A.), 10, 11(AV3.A.).
Replace IC801.
3-17
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