Philips VR752, VR750 Service Manual
Video Cassette Recorder
Service
Service
VR750
VR752
/39
/39
Service
Service Manual
Contents
Chapter
Adjustment Procedure
Sec. 1:
Schematic Diagrams and CBA's
Exploded Views
Mechanical and Electrical Parts Lists
Survey of versions:
/02 PAL B/G
/07 PAL I, UK/IRELAND
/16 PAL B/G, Spain
/39 PAL/SECAM-BG+PAL/SECAM-L/L',FRANCE
/58 PAL-BG/DK+SECAM-BG/DK,EAST-EURO
Sec. 2:
Standard Maintenance
Mechanism Alignment Procedures
Disassembly / Assembly of Mechanism
Deck Exploded Views
For technical data reference is made to the Service Manual of VR550/02/07/16
3103 785 22260. The present manual states only the differences.
Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified
be used.
Published by BK 2004 Video Service Department Printed in the Netherlands c
Copyright reserved Subject to modification GB 3103 785 22290
OPERATING CONTROLS AND FUNCTIONS
[ VR750/39, VR752/39 ]
The remote control
REC STANDBY/ON
1 2 3
4 5 6
7 8 9
0
PLAYSTATUS/EXIT CLEAR
REW FWD
MENU
STOP
TV-PROG.TV-VOL
STILL
SLOW SYSTEM
INDEXMUTE
TURBO
SMART
PICTURE
AUDIOSV/V+
TIMER
Buttons for VCR feature only
To record the TV channel selected at this moment.
REC
STANDBY/ON
0..9
Press to select channels at VCR.
+
PP
P–P
or slow motion playback, press to adjust the tracking.
STATUS/EXIT
status display. To exit on-screen menus.
CLEAR
ing (TIMER). To reset the elapsed time counter in the playback, recording or stop mode.
STILL
by step. (except for during fast forwarding and fast rewinding)
INDEX
ous or next recording on the cassette.
SLOW
AUDIO
SMART PICTURE
To set a TIMER programming with the S
SV/V+
tem.
TURBO TIMER
TURBO TIMER.
SYSTEM
MENU
FWD
tape at high speed. During playback, press to fast forward the tape while the
picture stays on the screen. To store or confirm entry in the menu.
REW
high speed. During playback, press to rewind the tape while the picture stays
on the screen.To return the cursor in the menu.
PLAY
STOP
To switch off or on, interrupt menu function.
To select the programme number. During normal
To access or remove the VCR’s on-screen
To delete last entry. To clear a programmed record-
To stop the tape and play back a picture step
In combination with
/ : to search for previ-
To view the picture in slow motion.
To change stereo sound and 2nd language.
To change the picture setting.
HOWVIEW sys-
To programme a recording with the function
To change the Video (Colour) System.
To call up main menu of VCR.
-
When tape playback is stopped, press to fast forward the
-
When tape playback is stopped, press to rewind the tape at
-
To play back a tape, select an item in the menu of VCR.
To stop the tape, select an item in the menu of VCR.
-
Buttons with TV feature
MUTE
To eliminate the TV’s sound. Press again to restore the volume.
TV-VOL
TV-PROG.
+
+
TV-VOL
TV-PROG.
–
To adjust the TV’s volume.
–
To select a programme number on the TV.
You can use this remote control to operate
some functions of Philips TVs.
1-5-3 HG493IB
Front of your VCR
STANDBY/ON
To switch off or on, interrupt menu function.
PROGRAMME-PROGRAMME+
To select the programme number. During nor-
mal or slow motion playback, press to adjust the tracking.
RECORD
To record the TV channel selected at this moment.
When tape playback is stopped, press to fast forward the tape at high
FWD.
speed. During playback, press to fast forward the tape while the picture stays on
the screen.
When tape playback is stopped, press to rewind the tape at high speed.
REW.
During playback, press to rewind the tape while the picture stays on the screen.
To play back a tape.
PLAY
STOP/EJECT
To stop the tape and eject the cassette.
FRONT A/V CONNECTORS
White and red socket Audio input socket left/right: To connect a camcorder or a
video recorder
.
Yellow socket Video input socket: To connect a camcorder or a video recorder.
Back of your VCR
AV 2 (DECODER) AV 1 (TV)
AUDIO
OUTPUT
AERIAL
L
RF OUT
R
AUDIO OUTPUT L R
)
AV2(DECODER
AV1(TV
AERIAL
RF OUT
To connect a satellite receiver, decoder, video recorder, etc.
)
To connect the TV.
To connect the aerial cable.
To connect the TV.
To connect an audio Hi-Fi amplifier.
1-5-4 HG493IB
SIGNAL NAME ABBREVIATIONS
[ VR750/39, VR752/39 ]
Signal Name Function
16P SCART 16Pin Control Signal
4.43MHz 4.43MHz Clock
8POUT-1
8POUT-2
A-COM Audio Head Common
SCART 1 8Pin Output Control
Signal
SCART 2 8Pin Output Control
Signal
Signal Name Function
C-POW-SW Capstan Power Switching Pulse
C-ROTA
C-SYNC Composite Synchronized Pulse
CLKSEL Clock Select (GND)
COLOR-IN
Color Phase Rotary Changeover
SIgnal
SECAM or MESECAM Chroma
Video Input Signal at Super
Impose
A-IN Audio Signal Input
A-IN-F Audio Signal Input Front
A-MODE Hi-Fi Tape Detection Signal
A-MUTE-H
A-OUT Audio Signal Output
A-PB/REC
AE-H Audio Erase Head
AFC
AGC IF AGC Comparator Signal
AL+12V
AL+12V/+20.5V
AL+15V
AL+44V
AL+5V
AL+9V
AMPC CTL AMP Connected Terminal
AMPVcc AMPVcc
AMPVREF IN V-Ref for CTL AMP
AMPVREF OUT V-Ref for CTL AMP
AVc c
C-CONT Capstan Motor Control Signal
C-F/R
C-FG
Audio Mute Control Signal (Mute
= “H”)
Normal Audio Play Back/Record
Signal
Automatic Frequency Control
Signal
Always +12V with AC Plug
Connected
Always +12V/+20.5V with AC
Plug Connected
Always +15V with AC Plug
Connected
Always +9V with AC Plug
Connected
Always +5V with AC Plug
Connected
Always +9V with AC Plug
Connected
A/D Converter Power Input/
Standard Voltage Input
Capstan Motor FWD/REV
Control Signal (FWD=”L”/
REV=”H”)
Capstan Motor Rotation
Detection Pulse
CTL (+)
CTL (-)
CTLAMP out To Monitor for CTL AMP Output
D-CONT Drum Motor Control Signal
D-PFG Drum Motor Pulse Generator
D-REC-H Delayed Record Signal
D-V-SYNC Dummy V-sync Output
DAVN-L VPS/PDC Data Receive = “L”
DRV-CLK
DRV-DATA
DRV-STB
END-S Tape End Position Detect Signal
FE-H Full Erase Head
FSC-IN
[4.43MHz]
FTV-IN
H-A-COMP Head Amp Comparator Signal
H-A-SW
Hi-Fi-A Hi-Fi Audio Head
Hi-Fi-COM Hi-Fi Audio Head Common
Hi-Fi-H-SW
HLF LPF Connected Terminal (Slicer)
IIC-BUS SCL
IIC-BUS SDA
JK1-8P-OUT
Playback/Record Control Signal
(+)
Playback/Record Control Signal
(-)
LED Clock Driver IC Control
Clock
LED Clock Driver IC Control
Data
LED Clock Driver IC Chip Select
Signal
4.43MHz Clock Input
Comparator Input of Video
Signal for Follow TV
Video Head Amp Switching
Pulse
Hi-Fi Audio Head Switching
Pulse
2
C BUS Control Clock
I
2
I
C BUS Control Data
SCART 8Pin Output Control
Signal
1-6-3 HG493SNA
Signal Name Function
KEY-1 Key Scan Input Signal 1
KEY-2 Key Scan Input Signal 2
LD-SW
Deck Mode Position Detector
Signal
Signal Name Function
ST-S
T-REEL Take Up Reel Rotation Signal
TIMER+5V +5V at Timer
Tape Start Position Detector
Signal
LINE-MUTE Audio Mute Control Signal
LM-FWD/REV Loading Motor Control Signal
LP LP
N-A-PB Normal Audio Playback
N-A-REC Normal Audio Recording
OSCin Clock Input for letter size
OSCout Clock Output for letter size
OSD-V-IN OSD Video Signal Input
OSD-V-OUT OSD Video Signal Output
OSDVcc OSDVcc
OSDVss OSDVss
P-DOWN-L
P-ON+15V +15V at Power-On Signal
P-ON+44V +44V at Power-On Signal
P-ON+5V +5V at Power-On Signal
P-ON-H Power On Signal at High
P80/C P80/C Terminal
PB-H-OUT Playback Signal Output at High
Power Voltage Down Detector
Signal
TRICK-H
TU-AUDIO Tuner Audio Input Signal
TU-VIDEO Tuner Video Input Signal
V(L) Video L Head
V(R) Video R Head
V-COM Video Head Common
V-ENV
V-IN Video Signal Input
V-IN-F Video Signal Input Front
V-OUT Video Signal Output
Vcc Vcc
VIDEO Video Signal
Vss Vss(GND)
X-IN Main Clock Input
X-OUT Main Clock Input
XC-IN Sub Clock
XC-OUT Sub Clock
Special Playback = “H” in
SECAM Mode
Video Envelope Comparator
Signal
PG-DELAY
POW-SAF
REC-SAF-SW
REMOCON-IN Remote Control Sensor
RESET System Reset Signal (Reset=”L”)
RESET+5V +5V at System Reset Signal
RF-SW Video Head Switching Pulse
RGBTHROUGH
S-REEL Supply Reel Rotation Signal
SC2-IN
SECAM-C-IN SECAM Chroma Signal Input
SECAM-FMOUT
SECAM-H SECAM Mode at High
Video Head Switching Pulse
Signal Adjusted Voltage
P-ON Power Detection Input
Signal
Recording Safety SW Detect
(With Record tab="L"/With out
Record tab="H")
SCART 2 RGB Through Control
Signal
Input Signal from Pin 8 of
SCART2
SECAM FM Signal Output
SIF
Tuner Audio Intermediate
Frequency Signal
1-6-4 HG493SNA
CABINET DISASSEMBLY INSTRUCTIONS
[ VR750/39, VR752/39 ]
1. Disassembly Flowchart
This flowchart indicates the disassembly steps to gain
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and
dress the cables as they were originally.
[1] Top Case
[2] Front Assembly
[3] VCR Chassis Unit
[4] Jack CBA
[5] Deck Assembly
[6] Main CBA
[8] Rear Panel
[7] Cylinder Shield
2. Disassembly Method
REMOVAL
ID/
LOC.
No.
PAR T
REMOVE/*UNHOOK/
Fig.
UNLOCK/RELEASE/
No.
UNPLUG/DESOLDER
Note
(1): Identification (location) No. of parts in the figures
(2): Name of the part
(3): Figure Number for reference
(4): Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P=Spring, L=Locking Tab, S=Screw,
CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5): Refer to “Reference Notes.”
Reference Notes
CAUTION: Locking Tabs (L-1) and (L-2) are fragile.
Be careful not to break them.
1. Remove five Screws (S-2), three Screws (S-3) and
Screw (S-4). Then, slowly lift the VCR Chassis Unit
(Deck Assembly, Jack CBA and Main CBA) up
while releasing two Locking Tabs (L-3).
2. When reassembling, solder wire jumpers as shown
in Fig. D5.
3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
Fig. D6. Then, install the Deck Assembly while
aligning the hole of Cam Gear with the pin of LDSW, the shaft of Cam Gear with the hole of LD-SW
as shown in Fig. D6.
[1] Top Case D1 7(S-1) -
Front
[2]
Assembly
VCR
[3]
Chassis
Unit
[4] Jack CBA D4 Desolder, (S-5) -
Deck
[5]
Assembly
[6] Main CBA D5 (L-4) -
Cylinder
[7]
Shield
Rear
[8]
Panel
↓
(1)
↓
(2)
D2 *3(L-1), *4(L-2) -
5(S-2), 3(S-3), (S-4),
D3
*2(L-3)
D5,
2(S-6), Desolder 2,3
D6
D5 (S-7) -
D5 ---------- -
↓
(3)
↓
(4)
1
↓
(5)
1-7-4 HG493DC
(S-1)
[1] Top Case
(S-1)
(S-1)
Fig. D1
(S-2)
(S-3)
[3] VCR
Chassis Unit
(S-2)
(S-3)
(S-2)
(S-4)
(S-3)
(S-2)
(L-2)
[2] Front
Assembly
(L-3)
Fig. D3
[4] Jack CBA
(S-5)
Desolder
(L-2)
(L-1)
Fig. D2
Fig. D4
1-7-5 HG493DC
[7] Cylinder Shield
FE Head
Cylinder Assembly
(S-7)
Pin
[8] Rear Panel
(L-4)
From
FE Head
From
Cylinder
Assembly
(S-6)
TOP VIEW
From
ACE Head
Assembly
ACE Head
Assembly
[5] Deck
Assembly
[6] Main CBA
(S-6)
From
Capstan Motor
Assembly
Lead with
blue stripe
[6] Main CBA
[5] Deck Assembly
Shaft
Hole
LD-SW
SW507
LD-SW
Cam Gear
Hole
Pin
[6] Main CBA
Fig. D6
Printing
Lead with
white stripe
Lead connections of Deck Assembly and Main CBA
Lead with
blue stripe
Desolder
from bottom
side
Fig. D5
1-7-6 HG493DC
[ VR750/39, VR752/39 ]
BLOCK DIAGRAMS
Servo/System Control Block Diagram
TO
AUDIO BLOCK
FROM/TO
Hi-Fi AUDIO
BLOCK
FROM/TO
VIDEO BLOCK
KEY
SWITCH
TP507
SENS-INH
KEY
SWITCH
8
WIRE ACROSS A HOLE IN THE PCB.
:INDICATES A TEST POINT WITH A JUMPER
:USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE.
:USED TO INDICATE A TEST POINT WITH NO TEST PIN.
:USED TO INDICATE A TEST POINT WITH A TEST PIN.
TEST POINT INFORMATION
OR.
.)
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECT
(CAN DISCONNECT AND RECONNECT
2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
7
KEY- 2
KEY- 1REMOCON-IN
REMOTE
RS501
LD-SW
14
SENSOR
S-LED
D502
LD-SW
9
AL+5V
IC501
(SERVO/SYSTEM CONTROL)
AL+5V
SW507
LED DISPLAY
FP562
IC561
(LED DISPLAY)
ST-S
END-S
CTL(+)
CTL(-)
94
957610480
232221
D1D2D3
DRV-DATA
28
686970
DRV-DATA
S-REEL
T-REEL
79
2011161413e12
D4
DRV-STB
DRV-CLK
2
1
DRV-STB
DRV-CLK
RESET
34
Q501
RESET
TIMER+5V
S-REEL
PS503
T-REEL
Q503
17
a
bcd
IC771
(COMPARATOR)
P-ON+5V
TU701(TUNER UNIT)
7
f
P-ON+5V
Q771,
Q772
14
9
8
SDA
3
FTV-IN
64
2
4
AND
j
5
11
SDA
12
13
10
SCL
5
SCL
IC503 (MEMORY)
11
SDA
5
SCL
6
AL+5V
IIC-BUS SCL
IIC-BUS SDA
REC-SAF-SW
PG-DELAY
2
31
AL+5V
VR501
SW-POINT
A-MUTE-H
SW506
A-MODE
Hi-Fi-H-SW
IIC-BUS SCL
IIC-BUS SDA
32
19
83
A-MUTE-H
A-MODE
Hi-Fi-H-SW
REC-SAFETY
P-ON+15V
AL+12V
CL502
P-ON+15V11AL+12V(2)10GND9D-PFG8D-CONT7LM-FWD/REV
12
RF-SW
D-REC-H
LINE-MUTE
IIC-BUS SCL
IIC-BUS SDA
71
183316
72
28
RF-SW
D-REC-H
LINE-MUTE
IIC-BUS SCL
IIC-BUS SDA
LM-FWD/REV
D-CONT
C-CONT
D-PFG
77
81
90
GND5C-CONT4C-F/R3C-FG2P-ON+5V1AL+12V/+20.5V
6
C-ROTA
D-V-SYNC
13
15
C-ROTA
D-V-SYNC
C-F/R
C-FG
78
87
V-ENV
H-A-SW
H-A-COMP
6
17
V-ENV
H-A-SW
H-A-COMP
AL+12V/+20.5V
P-ON+5V
DAVN-L
C-SYNC
58
56
DAVN-L
C-SYNC
C-POW-SW
66
C-POW-SW
FROM/TO
TRICK-H
SECAM-H
65
61
TRICK-H
SECAM-H
P-ON-H
P-DOWN-L
67
86
P-ON-H
P-DOWN-L
POWER
SUPPLY
BLOCK
" " = SMD
MAIN CBA
ST-S
Q504
Q505
SENSOR CBA
END-S
END-S
TP506
SENSOR CBA
(DECK ASSEMBLY)
V-IN1
TU-VIDEO
FROM
VIDEO
BLOCK
CL504
CL504
2 CTL(+)
1 CTL(-)
CONTROL
AC HEAD ASSEMBLY
HEAD
1-9-6
CAPSTAN MOTOR
SENSOR
M
DRUM
MOTOR
PG
CYLINDER ASSEMBLY
M
CAPSTAN
MOTOR
M
LOADING
MOTOR
HG493BLS
Video Block Diagram
VPS-V
IIC-BUS SDA
DAVN-L
IIC-BUS SCL
IC640 (VPS)
6147
16
THE PCB.
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
WITH A COMPONENT LEAD ON FOIL SIDE.
WITH A TEST PIN.
IIC-BUS SDA
IIC-BUS SCL
DAVN-L
FROM
SERVO/SYSTEM
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN
:USED TO INDICATE A TEST POINT
:USED TO INDICATE A TEST POINT WITH NO TEST PIN.
:USED TO INDICATE A TEST POINT
TEST POINT INFORMATION
OR.
.)
WIRE-SOLDER
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECT
(CAN DISCONNECT AND RECONNECT
2. PREFIX SYMBOL "CL" MEANS
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
" " = SMD
CONTROL BLOCK
IC501 (OSD)
MAIN CBA
50
55
COLOR
-IN
OSD
CHARACTER
MIX
52
CYLINDER ASSEMBLY
(DECK ASSEMBLY)
CL253
7978
69684643
SERIAL
DECORDER
Y. DELAY
65
IC301
(Y/C SIGNAL PROCESS)
BUFFER
Q351
TU-VIDEO
V-IN1TO
SERVO/SYSTEM
CONTROL BLOCK
VIDEO (L)-1
HEAD
VIDEO (R)-1
HEAD
456
123
V(L)-2
V(L)-1
V(R)-1
V-COM
V-COM
969593
94
SP
HEAD
AMP
SP
EP
P
R
LUMINANCE
SIGNAL
PROCESS
TUNER
6
VIDEO IN
TU701(TUNER UNIT)
VIDEO (R)-2
HEAD
VIDEO (L)-2
HEAD
V(R)-2
AGC
BYPASS
FRT
IN1
IN2
485052
54
24
VIDEO OUT
908988
EP
HEAD
CHARA.
INS.
IN2
56
JK756
V-IN
FRONT
Y
FRT
WF1
TP502
RF-SW
87
AMP
REC FM
AGC
+
C
CCD 1H DELAY
CHROMINANCE
1/2
MUTE
PB/EE
TUNER
D-REC-H
80
D-REC-H
SIGNAL
PROCESS
IN1
PB/EE
FROM/TO SERVO/SYSTEM
CONTROL BLOCK
RF-SW
H-A-SW
C-ROTA
D-V-SYNC
H-A-COMP
62
70
H-A-SW
D-V-SYNC
H-A-COMP
C-ROTA/RF-SW
RPRP
Y/C
MIX
FBC
MUTE
J23
WF3
JACK CBA
V-ENV
C-SYNC
TRICK-H
SECAM-H
IC370 (PAL/SECAM DECTECTOR)
67
848371
V-ENV
C-SYNC
PB-H OUT
21
252928 44
PR
AGC VXO
58 59
61
63
V-OUT
CL151
CL152
1
1
V-OUT1
V-OUT2
V-IN1
33
1
1
CL101
CL102
Q101
Q102
BUFFER
BUFFER
JK101
JK102
19
20
19
1
28
TP301
V-IN2 3
3
20
PAL/SECAM
DETECTOR
171418216
29
WF2
C-PB
X301
4.433619MHz
1-9-7
V-OUT1
V-IN1
V-OUT2
V-IN2
HG493BLV
Audio Block Diagram
Mode : SP/REC
PB-AUDIO SIGNAL REC-AUDIO SIGNAL
THE PCB.
WITH A COMPONENT LEAD ON FOIL SIDE.
WITH A TEST PIN.
TO SERVO/SYSTEM
11
12
SERIAL
DECODER
AUDIO HD-SW
CONTROL
71
68 69
16
MUTE
LINE
AMP
ALC
ALC
DET
IN1
1513 17
TUNER IN2
INV
P
R
ATT
98
REC-ON
REC
AMP
100
7
3
CONTROL BLOCK
A-MUTE-H
IIC-BUS SCL
IIC-BUS SDA
MAIN CBA
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN
:USED TO INDICATE A TEST POINT
:USED TO INDICATE A TEST POINT WITH NO TEST PIN.
:USED TO INDICATE A TEST POINT
TEST POINT INFORMATION
OR.
.)
WIRE-SOLDER
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECT
(CAN DISCONNECT AND RECONNECT
2. PREFIX SYMBOL "CL" MEANS
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
" " = SMD
N-A-PB
N-A-REC
TO Hi-Fi
AUDIO BLOCK
IC301
(AUDIO SIGNAL PROCESS)
EQ
PB-ON
5
AMP
6
SP/LP-ON
+5V
AUTO
BIAS
2
Q401
CL504
BIAS
Q402
3 A-PB/REC
4 A-COM
6 AE-H
1
Q406
OSC
5 AE-H/FE-H
Q403
CL501
+5V
Q405
2 FE-H
(PB=ON)
1 FE-H-GND
FE HEAD
ACE HEAD ASSEMBLY
AUDI O
HEAD
AUDI O
ERASE
HEAD
FULL
ERASE
HEAD
1-9-8
(DECK ASSEMBLY)
HG493BLA
Hi-Fi Audio Block Diagram
A-OUT
(L)
A-OUT
(R)
JK751
Mode : SP/REC
SIF OUT
TU701
(TUNER UNIT)
22
AUDIO OUT
21
AUDIO IN
2
FROM/TO
SERVO/SYSTEM
CONTROL BLOCK
Hi-Fi
CYLINDER
ASSEMBLY
AUDIO
(R) HEAD
Hi-Fi
AUDIO
(L) HEAD
CL509
A-OUT1(L)2A-OUT1(R)
1
REC-AUDIO SIGNALPB-AUDIO SIGNAL
THE PCB.
MAIN CBA
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN
:USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE.
:USED TO INDICATE A TEST POINT WITH NO TEST PIN.
:USED TO INDICATE A TEST POINT WITH A TEST PIN.
TEST POINT INFORMATION
SUB JACK CBA
AFV CBA
2
CN701
SIF
2
CN1
4
TU-AUDIO(R)
4
CN701 CN1
1
TU-AUDIO
1
IF SIGNAL
PROCESS
5
TU-AUDIO(L)
5
7374727677
MUTE-ON
VCO MUTE
OUTPUT
SELECT
75
MUTE-ON
A-MODE
IIC-BUS SCL
IIC-BUS SDA
Q451
37
38
LOGIC
ENV
R-CH
BPF
NOISE
COMP
SW
NOISE
PPR
R-CH
PNR
LINE-MUTE
21
53
MUTE
DET
DET
VCO
LIM DEV
Hi-Fi-H-SW
39
HOLD
PULSE
LPF
(DECK ASSEMBLY)
MIX V/I
LPF
VCO
LIM DEV
R
DO
L-CH
DET
PNR
CL253
Hi-Fi-A(R) 7
242627
R
Hi-Fi-COM 8
LIM
L-CH
COMP
SW
Hi-Fi-A(L) 9
L
34 33
BPF
NOISE
OR.
.)
WIRE-SOLDER
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECT
(CAN DISCONNECT AND RECONNECT
2. PREFIX SYMBOL "CL" MEANS
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
CL151
9
CL101
JK101
A-IN1(R)
A-IN1(L) 7
7
9
2
6
A-IN1(R)
A-IN1(L)
5
A-OUT1(R)
5
1
A-OUT1(R)
" " = SMD
JACK CBA
CL152
A-OUT1(L) 11
11
CL102
JK102
3
A-OUT1(L)
9
A-IN2(R)
A-IN2(L) 8
8
9
2
6
A-IN2(R)
A-IN2(L)
6
A-OUT2(R)
A-OUT2(L) 11
6
11
1
3
A-OUT2(R)
A-OUT2(L)
(Hi-Fi AUDIO SIGNAL PROCESS)
IC451
6108
JK757
A-IN(L)
14
L-CH
INSEL
15
4
ALC
+
78
N-A-REC
80
N-A-PB
TO AUDIO BLOCK
61 71
47
48
R-CH
INSEL
5256545060
JK758
A-IN(R)
2
FRONT
ALC
70
SW
ALC
62
ALC
SW
67
65
1-9-9
HG493BLH
Power Supply Block Diagram
P-ON+44V
P-ON+15V12P-ON-H
AL+12V/+20.5V
AL+9V
AL+12V
C-POW-SW
AL+5V
TIMER+5V
P-ON+5V
P-DOWN-L
Q053
MAIN CBA
CAUTION !
Fixed voltage (or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F001) is blown, check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
Q051
T001
2
CAUTION
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE T1.6AL/250V FUSE.
Q052
Q057
13
14
4
Q058
Q055
15
Q001
Q054
Q059
16
Q056
SHUNT
REGULATOR
Q004
11
17
18
1
4
IC001
ERROR
6
7
VOLTAGE DET
COLD
23
D001 - D004
L003
F001
HOT CIRCUIT. BE CAREFUL.
NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
BRIDGE
RECTIFIER
LINE
FILTER
T1.6A L 250V
AC001
1-9-10
Q002
Q003
HOT
HG493BLP
[ VR750/39, VR752/39 ]
MAIN 1/8 Schematic Diagram Parts Location Guide
Ref No. Position Ref No. Position Ref No. Position
CAPACITORS
C501 B-1 C862 D-3 R521 E-4
C502 B-1 R522 E-4
C506 C-1 CL501 A-2 R523 B-4
C508 E-2 CL502 F-4 R524 B-4
C510 E-2 CL504 A-2 R525 B-3
C511 E-2 R526 A-2
C512 E-2 D501 E-4 R527 A-2
C513 E-2 D502 A-1 R528 B-1
C514 E-2 D552 E-3 R529 A-1
C515 E-2 D553 E-2 R530 E-1
C516 E-2 R531 E-1
C517 E-4 IC501 C-3 R533 D-1
C518 E-4 IC503 A-4 R551 E-3
C519 B-4 R552 E-3
C520 A-3 L501 A-1 R553 F-2
C521 A-2 L851 D-3 R555 C-1
C522 A-2 R557 C-1
C523A-2Q501 E-2R616D-1
C524 A-2 Q503 D-1 R621 A-3
C526 A-2 Q551 E-3 R622 A-3
C527 B-2Q552 E-3R851D-3
C528 A-2 R852 D-3
C530 B-2R501 B-1R853D-4
C531 B-1 R502 B-2
C532 A-3 R503 C-2 SW506 D-1
C533 A-3 R504 B-1
C535 E-1 R505 B-1 VR501 B-1
C563 E-4 R506 C-1
C564 E-4 R508 E-4 X501 D-2
C567 F-4 R509 D-1 X502 D-2
C851 E-3 R510 C-4
C852 E-3 R511 E-2 PS503 E-1
C853 D-3 R513 E-2 RS501 B-2
C854 E-3 R514 E-2
C855 D-3 R516 D-2 TP501 A-2
C856 D-4 R517 D-3 TP502 C-1
C858 D-4 R518 F-3
C859 D-4 R520 E-4
CAPACITORS
CONNECTORS
DIODES
ICS
COILS
TRANSISTORS
RESISTORS
RESISTORS
SWITCH
VARIABLE RESISTOR
CRYSTAL OSCILLATORS
MISCELLANEOUS
TEST POINTS
1-10-31
Main 1/8 Schematic Diagram
T
0.00 ~ 0.51V POWER STOP/EJECT
0.51 ~ 0.92V CH DOWN REW
0.92 ~ 1.27V CH UP PLAY
1.27 ~ 1.61V ---------------- FF
1.61 ~ 1.98V ---------------- --------------
1.98 ~ 2.39V REC/OTR ------------- -
2.39 ~ 2.90V ---------------- --------------
2.90 ~ 3.60V SENS-INH --------------
3.60 ~ 4.30V ---------------- --------------
4. 30 ~ 5. 00 V KEY OFF KEY OF F
Pin No.
Voltage
KEY 1 (7 PIN) KEY 2 (8 PI N)
“ “ = SMD
MODE: SP/REC
THE SAME VOLTAGE FOR
BOTH PLAY & REC MODES.
2
1
5.0
3
5.0
~
(2.5)
INDICATES THAT THE VOLTAGE
IS NOT CONSISTENT HERE.
PLAY MODE
REC MODE
IC501 KEY VOLTAGE CHAR
1-10-32 1-10-33
HG493SCM1
Main 2/8 & Sensor Schematic Diagrams
D1 D2 D3 D4
a
b
c
d
e
f
g
c
d
e
f
g
c
d
e
f
g
c
d
e
f
g
h
j
i
a
b
c
d
e
f
g
a
b
a
b
a
b
FP562 MATRIX CHART
D1 D2 D3 D4
“ “ = SMD
a
f
g
e
d
MODE: SP/REC
THE SAME VOLTAGE FOR
BOTH PLAY & REC MODES.
2
1
5.0
3
5.0
~
(2.5)
INDICATES THAT THE VOLTAGE
IS NOT CONSISTENT HERE.
PLAY MODE
REC MODE
b
c
1-10-34
1-10-35
HG493SCM2
Loading...