Philips VR122 Service Manual
Video Cassette Recorder
VR122/02
VR122/58
Service
Service
Service
VR122/02, VR122/58
Service Manual
Contents
Chapter
Specifications
Sec. 1:
Adjustment Procedure
Schematic Diagrams and CBA's
Exploded Views
Mechanical and Electrical Parts Lists
Sec. 2:
Standard Maintenance
Mechanism Alignment Procedures
Disassembly / Assembly of Mechanism
Deck Exploded Views
Survey of types:
VR122: Video Cassette Recorder
Survey of versions:
/02, /58 PAL
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 2001 Video Service Department Printed in Japan c Copyright reserved Subject to modification GB 3103 785 21930
MAIN SECTION
VIDEO CASSETTE RECORDER
Sec. 1: Main Section
● Specifications
● Adjustment Procedures
● Schematic Diagrams and CBA’s
● Exploded Views
● Mechanical and Electrical Parts Lists
TABLE OF CONTENTS
SPECIFICATIONS ........................................................................................................................................ 1-1-1
IMPORTANT SAFETY PRECAUTIONS ........................................................................................................ 1-2-1
STANDARD NOTES FOR SERVICING ......................................................................................................... 1-3-1
FUNCTION INDICATOR SYMBOLS ............................................................................................................. 1-4-1
PREPARATION FOR SERVICING................................................................................................................. 1-5-1
OPERATING CONTROLS AND FUNCTIONS .............................................................................................. 1-6-1
SIGNAL NAME ABBREVIATIONS.................................................................................................................. 1-7-1
CABINET DISASSEMBLY INSTRUCTIONS.................................................................................................. 1-8-1
ELECTRICAL ADJUSTMENT INSTRUCTIONS............................................................................................. 1-9-1
ADJUSTMENT POINTS AND TEST POINTS............................................................................................. 1-9-2
BLOCK DIAGRAMS ....................................................................................................................................... 1-10-1
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS .................................................................................1-11-1
MAIN 1/4 SCHEMATIC DIAGRAM PARTS LOCATION GUIDE .................................................................1-11-2
MAIN 1/4 SCHEMATIC DIAGRAM .............................................................................................................1-11-3
MAIN 2/4 SCHEMATIC DIAGRAM .............................................................................................................1-11-6
MAIN 2/4 SCHEMATIC DIAGRAM PARTS LOCATION GUIDE .................................................................1-11-9
MAIN 3/4 SCHEMATIC DIAGRAM PARTS LOCATION GUIDE .................................................................1-11-10
MAIN 3/4 SCHEMATIC DIAGRAM .............................................................................................................1-11-11
MAIN 4/4 SCHEMATIC DIAGRAM .............................................................................................................1-11-14
FUNCTION SCHEMATIC DIAGRAM ..........................................................................................................1-11-17
JACK SCHEMATIC DIAGRAM....................................................................................................................1-11-19
MAIN CBA TOP VIEW (BH8700F01016-A) ...............................................................................................1-11-21
MAIN CBA BOTTOM VIEW (BH8700F01016-A) ........................................................................................1-11-24
MAIN CBA PARTS LOCATION GUIDE ......................................................................................................1-11-27
FUNCTION CBA TOP VIEW / BOTTOM VIEW (BH8700F01031) .............................................................1-11-29
JACK CBA TOP VIEW / BOTTOM VIEW (BH87T4F01021) ,
POWER SW CBA TOP VIEW / BOTTOM VIEW (BH8700F01016-B)...................................................1-11-31
WAVEFORMS................................................................................................................................................. 1-12-1
WIRING DIAGRAMS ...................................................................................................................................... 1-13-1
SYSTEM CONTROL TIMING CHARTS ......................................................................................................... 1-14-1
IC PIN FUNCTION DESCRIPTIONS.............................................................................................................. 1-15-1
LEAD IDENTIFICATIONS............................................................................................................................... 1-16-1
ELECTRICAL PARTS LIST ............................................................................................................................ 1-17-1
EXPLODED VIEWS........................................................................................................................................ 1-18-1
SET MECHANICAL PARTS LIST ................................................................................................................... 1-19-1
H87T4CV
SPECIFICATIONS
Description Unit Minimum Nominal Maximum Remark
1. Video
1-1. Video Output (PB) Vp-p 0.8 1.0 1.2 SP Mode
1-2. Video Output (R/P) Vp-p 0.8 1.0 1.2
1-3. Video S/N Y (R/P)
1-4. Video Color S/N AM (R/P) dB 37 41 SP Mode
1-5. Video Color S/N PM (R/P) dB 30 36 SP Mode
1-6. Resolution (PB) Line 230 245 SP Mode
2. Servo
2-1. Jitter Low µsec 0.07 0.12 SP Mode
2-2. Wow & Flutter % 0.3 0.5 SP Mode
3. Normal Audio
3-1. Output (PB) dBV -9 -6 -3 SP Mode
3-2. Output (R/P) dBV -9 -6 -1.5 SP Mode
3-3. S/N (R/P) dB 36 41 SP Mode
3-4. Distortion (R/P) % 1.0 4.0 SP Mode
3-5. Freq. resp (R/P) at 200Hz dB -7 -4 SP Mode
(-20dB ref. 1kHz) at 6kHz dB -10 -4 SP Mode
4. Tuner
4-1. Video output Vp-p 0.8 1.0 1.2 E-E Mode
4-2. Video S/N dB 39 42 E-E Mode
4-3. Audio output dB -10 -6 -2 E-E Mode
4-4. Audio S/N dB 40 46 E-E Mode
dB 40 45
SP Mode,
W/O Burst
Note: Nominal specs represent the design specs. All units should be able to approximate these – some will exceed
and some may drop slightly below these specs. Limit specs represent the absolute worst condition that still might be
considered acceptable; In no case should a unit fail to meet limit specs.
1-1-1 H87F1SP
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice
Some electrical and mechanical parts have special
safety-related characteristics which are often not evident from visual inspection, nor can the protection they
give necessarily be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts
that have special safety characteristics are identified by
a ! on schematics and in parts lists. Use of a substitute replacement that does not have the same safety
characteristics as the recommended replacement part
might create shock, fire, and/or other hazards. The
Product’s Safety is under review continuously and new
instructions are issued whenever appropriate. Prior to
shipment from the factory, our products are carefully
inspected to confirm 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
A.Parts identified by the ! symbol are critical for
safety. Replace only with part number specified.
B.In addition to safety, other parts and assemblies are
specified for conformance with regulations applying
to spurious radiation. These must also be replaced
only with specified replacements.
Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.
C.Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
D.Use specified insulating materials for hazardous live
parts. Note especially:
1) Insulation tape
2) PVC tubing
3) Spacers
4) Insulators for transistors
E.When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of wires
securely about the terminals before soldering.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.).
G.Check that replaced wires do not contact sharp
edges or pointed parts.
H.When a power cord has been replaced, check that
5 - 6 kg of force in any direction will not loosen it.
I.Also check areas surrounding repaired locations.
J.Use care that foreign objects (screws, solder drop-
lets, etc.) do not remain inside the set.
K.Crimp type wire connector
The power transformer uses crimp type connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to prevent
shock hazards.
Replacement procedure
1)Remove the old connector by cutting the wires at a
point close to the connector.
Important: Do not re-use a connector. (Discard it.)
2)Strip about 15 mm of the insulation from the ends of
the wires. If the wires are stranded, twist the strands
to avoid frayed conductors.
3)Align the lengths of the wires to be connected. Insert
the wires fully into the connector.
4)Use a crimping tool to crimp the metal sleeve at its
center. Be sure to crimp fully to the complete closure
of the tool.
L.When connecting or disconnecting the internal con-
nectors, first, disconnect the AC plug from the AC
outlet.
1-2-1 SFTY_06
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 their original positions.
Afterwards, do the following tests and confirm the specified values to verify compliance with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d’) between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
AC Line Voltage Clearance Distance (d) (d’)
110 to 240 V
≥ 3mm(d)
≥ 6 mm(d’)
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the 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.) is lower
than or equal to the specified value in the table below.
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 the terminals of load Z.
See Fig. 2 and the following table.
Table 2 : Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
110 to 240 V
2kΩ RES.
Connected in
parallel
50kΩ RES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC
i≤0.7mA AC Peak
i≤2mA DC
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
One side of power cord plug
prongs (B) to:
RF or
Antenna terminals
A/V Input, Output
AC Voltmeter
(High Impedance)
Fig. 1
Fig. 2
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
1-2-2 SFTY_06
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a.The output pin of the 3 pin Regulator ICs is indicated
as shown.
Top View
Out
b.For other ICs, pin 1 and every fifth pin are indicated
as shown.
Input
In
Bottom View
5
Pin 1
10
c.The 1st pin of every male connector is indicated as
shown.
Pin 1
Instructions for Connectors
1.When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect the
AC cord.
2.FFC (Flexible Foil Connector) cable should be inserted parallel into the connector, not at an angle.
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
(1)Prepare the hot-air flat pack-IC desoldering ma-
chine, then apply hot air to the Flat Pack-IC (about
5 to 6 seconds). (Fig. S-1-1)
Fig. S-1-1
(2)Remove the flat pack-IC with tweezers while apply-
ing the hot air.
(3)Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4)Release the flat pack-IC from the CBA using tweez-
ers. (Fig. S-1-6)
Caution:
1.Do not supply hot air to the chip parts around the flat
pack-IC for over 6 seconds because damage to the
chip parts may occur. Put masking tape around the
flat pack-IC to protect other parts from damage.
(Fig. S-1-2)
2.The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Tweezers
1-3-1 NOTE_1
Machine
Flat Pack-IC
Fig. S-1-2
With Soldering Iron:
(1)Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
(4)Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(5)Release the flat pack-IC from the CBA using tweez-
ers. (Fig. S-1-6)
Flat Pack-IC
Desoldering Braid
Soldering Iron
Fig. S-1-3
(2)Lift each lead of the flat pack-IC upward one by one,
using a sharp pin or wire to which solder will not
adhere (iron wire). When heating the pins, use a fine
tip soldering iron or a hot air desoldering machine.
(Fig. S-1-4)
Sharp
Pin
Note:
When using a soldering iron, care must be taken to
ensure that the flat pack-IC is not being held by glue.
When the flat pack-IC is removed from the CBA,
handle it gently because it may be damaged if force
is applied.
Hot Air Blower
or
Iron Wire
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
Fine Tip
Fig. S-1-4
Soldering Iron
(3)Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4)Release the flat pack-IC from the CBA using tweez-
ers. (Fig. S-1-6)
With Iron Wire:
(1)Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
(2) Affix the wire to a workbench or solid mounting point,
as shown in Fig. S-1-5.
(3)While heating the pins using a fine tip soldering iron
or hot air blower, pull up the wire as the solder melts
so as to lift the IC leads from the CBA contact pads
as shown in Fig. S-1-5.
CBA
Tweezers
Fine Tip
Soldeing Iron
Flat Pack-IC
Fig. S-1-6
1-3-2 NOTE_1
2. Installation
(1)Using desoldering braid, remove the solder from the
foil of each pin of the flat pack-IC on the CBA so you
can install a replacement flat pack-IC more easily.
(2)The " ● " mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
pre- solder the four corners of the flat pack-IC. (See
Fig. S-1-8.)
(3)Solder all pins of the flat pack-IC. Be sure that none
of the pins have solder bridges.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " ● " mark.
Fig. S-1-7
Instructions for Handling
Semi-conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is properly
grounded to remove any static electricity that may be
charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate with
proper grounding (1MΩ) on the workbench or other
surface, where the semi-conductors are to be placed.
Because the static electricity charge on clothing will not
escape through the body grounding band, be careful to
avoid contacting semi-conductors with your clothing.
< Incorrect >
CBA
Presolder
Flat Pack-IC
CBA
< Correct >
Grounding Band
Fig. S-1-8
1MΩ
CBA
1MΩ
Conductive Sheet or
Copper Plate
1-3-3 NOTE_1
FUNCTION INDICATOR SYMBOLS
Note:
The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR.
On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons.
Display panel
" H "= LED Light on, " L "= LED Light off
Led Mode Indicator Active
POWER Power on = " H "
CASS. Cassette in = " H "
1. When reel and capstan mechanism
is not functioning correctly
2. When tape loading mechanism is not
functioning correctly
3. When cassette loading mechanism is
not functioning correctly
4. When the drum is not working properly Cassette in Blinks at 6.4Hz interval
TIMER Timer stand by = " H "
RECORD REC mode = " H "
Power off = " L "
Cassette out = " L "
Cassette in Blinks at 0.8Hz interval
Cassette in Blinks at 1.6Hz interval
Cassette in Blinks at 3.2Hz interval
One touch recording = " H "
Timer recording = " H "
General mode = " L "
REC pause
General mode = " L "
Blinks at 0.8Hz interval
1-4-1 H87T4FIS
PREPARATION FOR SERVICING
How to Enter the Service Mode
About Optical Sensors
Caution:
An optical sensor system is used for the Tape Start and
End Sensors on this equipment. Carefully read and
follow the instructions below. Otherwise the unit may
operate erratically.
What to do for preparation
Insert a tape into the Deck Mechanism Assembly and
press the PLAY button. The tape will be loaded into the
Deck Mechanism Assembly. Make sure the power is
on, connect TP507 (SENSOR INHIBITION) to GND.
This will stop the function of Tape Start Sensor, Tape
End Sensor and Reel Sensors. (If these TPs are con-
nected before plugging in the unit, the function of the
sensors will stay valid.) See Fig. 1.
Note: Because the Tape End Sensors are inactive, do
not run a tape all the way to the start or the end of the
tape to avoid tape damage.
About REC-Safety Switch
Caution:
The REC-Safety Switch is directly mounted on the Main
CBA. When the Deck Mechanism Assembly is removed
from the Main CBA for servicing, this switch does not
work automatically.
What to do for preparation
In order to record, press the Rec button while pushing
REC-SAFETY SW on the Main CBA. See Fig. 1.
CN501
Q504
CN504
CN251
SW506
CN506
Q503
CN503
TP507
S-INH
(REC-SAFETY SW)
Fig. 1
1-5-1 H87T4PFS
1-6-1 H87T4IB
Front Panel
56789
1243
Rear Panel
15 16
1718
RF OUT
AERIAL
TV
Indicator
POWER ON CASS. TIMER RECORD
PROGRAMME
–
+
10 11 12 13 14
15. AC power cord
16. TV scart jack
17. RF OUT terminal
18. AERIAL terminal
11. Cassette compartment
12. h (REW) button
13. PLAY button
14. g (FF) button
15. STOP/EJECT button
16. RECORD button
17. PROGRAMME (–/+) buttons
18. Indicator (See below.)
19. STANDBY/ON button
10. POWER indicator
11. ON indicator
12. CASS. indicator
13. TIMER indicator
14. RECORD indicator
OPERATING CONTROLS AND FUNCTIONS (A)
Comparison Chart of Models and Marks
Model Mark
VR122/02 A
VR122/58 B
1-6-2 H87T4IB
Remote Control
1 2 3
4 5 6
7 8
0
VCR TV
SPEED
9
STANDBY
EJECT
MENU STATUS/EXIT CLEAR
MEMORY ALT.CH
REC
/OTR
PAUSE
/STILL
PLAY
STOP
REW
F.FWD
CH. VOL.
MUTE
1
2
3
4
5
6
7
9
8
10
11
12
13
14
15
16
17
18
19
20
11. EJECT button
12. MENU button
13. NUMBER buttons
14. MEMORY button
15. PLAY button
16. REC/OTR button
17. REW button
18. MUTE button
19. P(rogramme) buttons
10. VCR button
11. STANDBY button
12. STATUS/EXIT button
13. CLEAR button
14. ALT.CH. button
15. PAUSE/STILL button
16. F.FWD button
17. STOP button
18. VOL(ume) buttons
19. TV button
20. SPEED button
You can use this remote control to operate
some of PHILIPS TVs. Press [VCR] before
pressing VCR feature buttons; press [TV]
before pressing TV feature buttons if you
have a PHILIPS TV.
NOTE
1-6-3 H87T5IB
Front Panel
1 2 3
589 7 6
4
Rear Panel
15 16
1718
RF OUT
AERIAL
TV
Indicator
10 11 12 13 14
15. AC power cord
16. TV scart jack
17. RF OUT terminal
18. AERIAL terminal
11. Cassette compartment
12. E(REW) button
13. PLAY button
14. D(FF) button
15. STOP/EJECT button
16. RECORD button
17. PROGRAMME (-/+) buttons
18. Indicator (See below.)
19. STANDBY/ON button
10. POWER indicator
11. ON indicator
12. CASS. indicator
13. TIMER indicator
14. RECORD indicator
OPERATING CONTROLS AND FUNCTIONS (B)
1-6-4 H87T5IB
Remote Control
1 2 3
4 5 6
7 8
0
VCR TV
SPEED
9
STANDBY
EJECT
MENU STATUS/EXIT CLEAR
MEMORY ALT.CH
REC
/OTR
PAUSE
/STILL
PLAY
STOP
REW
F.FWD
CH. VOL.
MUTE
1
2
3
4
5
6
7
9
8
10
11
12
13
14
15
16
17
18
19
20
11. EJECT button
12. MENU button
13. NUMBER buttons
14. MEMORY button
15. PLAY button
16. REC/OTR button
17. REW button
18. MUTE button
19. P(rogramme) buttons
10. VCR button
11. STANDBY button
12. STATUS/EXIT button
13. CLEAR button
14. ALT.CH. button
15. PAUSE/STILL button
16. F.FWD button
17. STOP button
18. VOL(ume) buttons
19. TV button
20. SPEED button
You can use this remote control to operate
some of PHILIPS TVs. Press [VCR] before
pressing VCR feature buttons; press [TV]
before pressing TV feature buttons if you
have a PHILIPS TV.
NOTE
SIGNAL NAME ABBREVIATIONS
Signal Name Description
AFC
A-COM Audio Head Common
A-IN Line Audio In
A-IN-F Line Audio In Front
A-OUT Audio Out Signal
A-MUTE Audio Mute Control Signal
A-PB/REC
AE-H Audio Erase Head
AFC Auto Frequency Control Signal
AL+12V
AL+44V
AL+5V
AVcc
CAS-LED "CASSETTE" LED Signal Output
CLKSEL Clock Select (GND)
C-CONT Capstan Motor Control Signal
C-FG
C-F/R
C-ROTA
C-SYNC
D-CONT Drum Motor Control Signal
D-FG
D-PG Drum Motor Pulse Generator
D-REC-H Delayed Record Control
D-V SYNC
END-S Tape End Position Detect Signal
FE-H GND Ground for Full Erase Head
FLDVcc FLDVcc
FLDVp GND
HLF LPF Connected Terminal (Slicer)
IIC BUS-SCL IIC BUS Control Clock
IIC BUS-SDA IIC BUS Control Data
Automatic Frequency Control
Signal
Normal Audio Play Back/Record
Signal
Always +12V with AC Plug
Connected
Always +44V with AC Plug
Connected
Always +5V with AC Plug
Connected
A/D Converter Power Input/
Standard Voltage Input
Capstan Motor Rotation Detection
Pulse
Capstan Motor FWD/REV Control
Signal
Control Phase Rotary
Changeover Signal
Composite Synchronized Pulse
V-Sync+H-Sync
Drum Motor Rotation Detection
Pulse
Dummy Vertical Synchronized
Pulse
Signal Name Description
KEY-1 Key Scan Input Signal 1
KEY-2 Key Scan Input Signal 2
LD-SW
LM-FWD/REV Loading Motor Control Signal
MAIN CLOCK Main Clock Input 17.734476 MHz
IN Clock Input for letter size
OSC
OUT Clock Output for letter size
OSC
OSD-CHARA-
OUT
OSD-BB-OUT Composite Video Signal Output
PB-CTL Playback Control Signal
PG-
DELAY
POWER
SAFETY
P-DOWN-L Power Voltage Down Detector
P-ON+5V +5V at Power-On Signal
P-ON+9V +9V at Power-On Signal
P-ON-L Power-On Low Signal
REC-CTL(+) Record Control Signal(+)
REC-CTL(-) Record Control Signal(-)
REC- LED "REC" LED Signal Output
REC-SAF-SW
REMOCON-IN Remote Control Sensor
RESET System Reset Signal (Reset= "L")
SECAM-
CHARA-H
RF-SW Head Switching Pulse
ST-S
TIMER+5V +5V at Timer
TIMER LED "TIMER" LED Signal Output
TU-AUDIO Tuner Audio Input Signal
TU-VIDEO Tuner Video Input Signal
TU-SW-1
TU-SW-2
TV/VCR TV/VCR Control
T-REEL Take Up Reel Rotation Signal
Deck Mode Position Detector
Signal
Character Output
(Superimposed)
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")
SECAM or MESECAM Mode
Super Inpose="H"
Tape Start Position Detector
Signal
Tuner System Control Signal
Output
Tuner System Control Signal
Output
1-7-1 H87F0SNA
Signal Name Description
V-ENV Video Envelope Signal
V-IN Video Input Signal
V-IN-F Line Video In Front
V-OUT Video Output Signal
VHOLD
Vss Vss(GND)
XC IN Sub Clock 32 kHz
4.43MHZ 4.43MHZ Clock Signal
Condenser Connected Terminal
(Slicer)
1-7-2 H87F0SNA
CABINET DISASSEMBLY INSTRUCTIONS
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] Jack CBA
[4] Function CBA [5] Deck Assembly
[7] REC Arm Assembly
[8] Main CBA
[6] Cylinder Shield
Disassembly Method
REMOVAL
ID/
LOC.
No.
[1] Top Case 1 6(S-1) -
[2]
[3] Jack CBA 3 2(S-2), (CN101) -
[4]
[5]
[6]
[7]
[8] Main CBA 6 4(S-5), *2(L-4) 3
↓
➀
PART
Front
Assembly
Function
CBA
Deck
Assembly
Cylinder
Shield
REC Arm
Assembly
↓
➁
REMOVE/
Fig.
*UNHOOK/UNLOCK/
No.
RELEASE/UNPLUG/
DESOLDER
2 *3(L-1), *4(L-2)
2, 4 *(L-3), (CN505)
5,7 6(S-3), Spacer
*(CN251, CN501,
CN503, CN504,
CN506)
52(S-4)
5 ----------
↓
➂
↓
➃
Note
-
1
2, 4
-
-
↓
➄
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, un-
locked, 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. Disconnect Connector (CN505) to remove Function
CBA. Hold Main CBA while pulling up on the Function CBA. (Fig. 4)
2. Remove six Screws (S-3) and the Spacer. Then
slowly lift the Deck Assembly up. Lifting Deck Assembly disconnects five Connectors (CN251,
CN501, CN503, CN504, CN506) . (Fig. 5)
3. When reassembling the unit, always reinsert Locking Tabs (L-4), and then reinstall Screws (S-5).
These screws are critical for proper shielding of the
Main CBA. (Fig. 7)
4. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
Fig. 7. Then, install the Deck Assembly while aligning the hole of Cam Gear with the pin of LD-SW, the
shaft of Cam Gear with the hole of LD-SW as shown
in Fig. 7.
1-8-1 H87T4DC
(S-1)
(S-1)
[1]Top Case
(L-3)
Lift PCB up and
over tab
[4] Function CBA
(L-2)
(L-2)
(S-1)
Fig. 1
[4]Function C.B.A.
[8] Main CBA
(S-3)
[7]REC Arm
Assembly
Spacer
CN505
Fig. 4
(S-3)
[5]Deck Assembly
(S-4)
[6]Cylinder
Shield
(L-1)
CN101
[2]Front Assembly
(S-2)
Fig. 2
(S-2)
[3] Jack CBA
Fig. 3
CN501
CN251
CN503
CN504
CN506
Fig. 5
1-8-2 H87T4DC
(S-5)
(S-5)
(L-4)
Triangle Marks
[8]Main C.B.A.
(L-4)
Fig. 6
SW507
LD-SW
[5]Deck Assembly
Shaft
Hole
LD-SW
[8]Main C.B.A.
Cam Gear
Hole
Pin
[8]Main C.B.A.
Fig. 7
1-8-3 H87T4DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is an abbreviation for
"Circuit Board Assembly."
NOTE:
1.Electrical adjustments are required after replacing
circuit components and certain mechanical parts. It
is important to do these adjustments only after all
repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.
2.To perform these alignment / confirmation procedures, make sure that the tracking control is set in
the center position: Press either "▼" or "▲" button
on the remote control unit first, then the "PLAY"
button (Front Panel only).
CH1
CH2
Figure 1
EXT. Syncronize Trigger Point
1.0H
Switching Pulse
6.5H
V-Sync
0.5H
Test Equipment Required
1.Oscilloscope: Dual-trace with 10:1 probe, V-Range:
0.001~50V/Div., F-Range: DC~AC-20MHz
2.Alignment Tape (4822 395 10283)
Head Switching Position Adjustment
Purpose:
To determine the Head Switching point during playback.
Symptom of Misadjustment:
May cause Head Switching noise or vertical jitter in
the picture.
Test Point Adj. Point Mode Input
TP751(V-OUT)
TP502(RF-SW)
GND
Tape
4822 395 10283 Oscilloscope
Connections of Measurement Equipment
VR501
(Switching Point)
(MAIN CBA)
Measurement
Equipment
PLAY
(SP)
6.5H±1H
(412.7µs±60µs)
----
Spec.
Reference Notes:
Play back the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output waveform
is at the 6.5H(412.7µs) delayed position from the rising
edge of the CH2 head switching pulse waveform.
Main CBA
Oscilloscope
TP751
GND
TP502
CH1 CH2
Trig. (+)
1-9-1 H87F0EA
Adjustment Points and Test points
Main CBA Top View
AUDIO
BLOCK
VIDEO
BLOCK
TP751
V-OUT
TUNER
BLOCK
TP301
C-PB
VR501
SW-P
J981
A-OUT
TP502
RF-SW
SYSCON/TIMER
SERVO BLOCK
TEST POINT INFORMATION
: Indicates a test point with a jumper wire across a hole in the PCB.
TEST POINTS NOT USED IN ELECTRICAL ADJUSTMENTS
Test Point
TP301
TP502
TP501
TP507
Mechanical Alignment Procedures
Mechanical Alignment Procedures
Mechanical Alignment Procedures
Preparation for Servicing
Used in: Page No.
POWER
SUPPLY
BLOCK
TP507
SENS-INH
TP501 CTL
POWER
CTL
BLOCK
2-3-3, 2-3-4
2-3-3, 2-3-4
2-3-3
1-5-1
Audio In/Out,Video In/Out
Main CBA
Tuner Unit
Antenna In
Antenna Out
1-9-2 H87T4EA
Servo/System Control Block Diagram BLOCK DIAGRAMS
" " = SMD
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECTOR.
(CAN DISCONNECT AND RECONNECT.)
2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
TEST POINT INFORMATION
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB.
: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.
(DECK ASSEMBLY)
AC HEAD ASSEMBLY
CONTROL
HEAD
CYLINDER ASSEMBLY
DRUM
MOTOR
PG
SENSOR
M
CN287
5 8CTL(+)
6 9CTL(-)
CN504
CN506
1D-W
2D-V
3D-U
4D-COM
5PG-IN
MAIN CBA
10
9
25
24
22
21
16
15
17
4
2
IC503
(1/3)
+
8
-
CTL
TP501
IC506
(DRUM /LOADING MOTOR DRIVE)
DRUM
MOTOR
DRIVE
+
-
DRIVE
LOADING
MOTOR
CONTROL
13
12
AL+5V
D555
S-LED
IC501
RS501
REMOTE
SENSOR
+
14
-
SW507
LD-SW
14
20
18
9
AL+5V
P-ON+5V
(SERVO/SYSTEM CONTROL)
REMOCON
1
REC-CTL(+)
19
REC-CTL(-)
20
PB-CTL
54
LD-SW74
D-CONT56
D-FG
52
D-PG
53
LM-
59
FWD/REV
I2C BUS SCL-2
I2C BUS SDA-2
KEY-1
KEY-2
CAS-LED
TIMER-LED 91
REC-LED
REC-SAF-SW 25
72
73
92
87
KEY
SWITCH
4
5
TP507
S-INH
P-ON+5V
AL+5V
AL+5V
SW506
REC-SAFETY
2 2KEY-2
FUNCTION CBA
CN651CN505
D599 POWER
D595 STAND-BY
D598 CAS
D597 TIMER
D596 REC
TU701
5
SCL
11
SCL
SDA
3
SDA
12
KEY SWITCH
LOADING MOTOR ASSEMBLY
LOADING
MOTOR
M
CAPSTAN MOTOR
CAPSTAN
MOTOR
M
FG-GND
CN504
1LD-M(-)
2LD-M(+)
CN503
1C-F/R
2P-ON+5V
3AL+12V
4C-FG
5NU
6C-DRIVE
7
8CM-GND
P-ON+5V
AL+12V
Q503
ST-S
TP506
END-S
Q504 Q506
END-S
T-REEL
TIMER+5V
AL+5V
Q501
RESET
VR501
SW-POINT
ST-S
75
68
END-S
T-REEL
49
RESET34
C-F/R
66
51
C-FG
C-CONT
55
71
PG-DELAY
A-MUTE-H
D-REC-H
I2C BUS SCL-1
I2C BUS SDA-1
V-ENV
C-ROTA
RF-SW
P-DOWN-L
P-ON-H
60
62
10
70
15
17
63
61
IC505
(MEMORY)
6
SCL
5
SDA
A-MUTE-H
D-REC-H
I2C BUS SCL-1
I2C BUS SDA-1
I2C BUS SCL-1
9
I2C BUS SDA-1
V-ENV
C-ROTA
RF-SW
P-DOWN-L
P-ON-H
TO AUDIO
BLOCK
TO VIDEO
BLOCK
TO POWER
SUPPLY
BLOCK
1-10-1 1-10-2 H87T4BLS
Video Block Diagram
" " = SMD
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECTOR.
(CAN DISCONNECT AND RECONNECT.)
2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
TEST POINT INFORMATION
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB.
: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.
Comparison Chart of
Models & Marks
Model Mark
VR122/02
VR122/58
A
B
JK101
CN101 CN751
V-OUT
19
20
V-IN 55
JACK CBA
TU701
VIDEO
TU-VIDEO
IC501
SECAM-CHARA-H
C-SYNC
OSD-CHARA-OUT
OSD-BB-OUT
V-OUT 77
V-IN
24
TP751
V-OUT
WF1
MAIN CBA
Q305
BUFFER
Q311
BUFFER
B
IC301
(Y/C PROCESS)
29 67 66 49
Q311
AMP
6
Q309
AMP
CHARA
INS.
B/B
FBC
R/P
TUNER
36
38
LINE
32 31
EE
AGC
R P
Y/C
MIX
2
C-SYNC
21
31
30
33
BUFFER
Q308
28
26
25
27
R P
CLAMP
BPF
D-V SYNCD-V SYNC
D.E.
X302
4.43MHz
43
VXO
R
1/2
NOISE
CANCELMDE EMPA
PIC-CTL
ANR
C-COMB COMB
Y-LPF
P
P
R
KIL
AMP
Q307
45
CCD 1H
DELAY
DOC YNR Y/C COMB
MAPBPF
KILL
B.D.
CCD
LPF
BUFFER
46 41
R P
CLAMP
ACC
Q304
B-UP
AMP
4.43MHz
BUFFER
CLAMP
DETAIL
ENH
W/D
CLIP
CONV
629KHz
BPF
MAIN
CONV
SUB
21 24 2320
R P
FM
MOD
R
P
I2C BUS SDA-1
I2C BUS SCL-1
SERIAL
DECORDER
V/I
CONV
REC
FM-EQ
C-LPF
SUB
LPF
REC FM
AGC
FM
DEMOD.
PB FM
AGC
TO
SERVO/SYSTEM
CONTROL BLOCK
DOUBLE
LIMIT
NL
EMPHA
R
PB
FM-EQ
P
17
19
18
Q302,
Q303
PEAKING
AMP
72715759 54 52 51 61
(DECK ASSEMBLY)
CYLINDER ASSEMBLY
VIDEO (L) HEAD
VIDEO (R) HEAD
CN251
1
2
3
V(L)
V-COM
V(R)
91
90
89
L
R
88
1-10-3 1-10-4
ENV DET
C-ROTA
10
93
11
74
C-ROTA
TP502
RF-SW
WF2
V-ENV
RF-SW
TP301
C-PB
WF5
TO
SERVO/SYSTEM
CONTROL BLOCK
H87T4BLV
Audio Block Diagram
" " = SMD
A-IN
A-IN
A-OUT
A-OUT
JACK CBA
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECTOR.
(CAN DISCONNECT AND RECONNECT.)
2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
JK101
2
6
1
3
TU701
CN101
AUDIO
TU-AUDIO 21
1 1A-IN
3 3A-OUT
2
CN751
TEST POINT INFORMATION
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB.
: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.
J981
A-OUT
PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC
MAIN CBA
IC301
(AUDIO PROCESS) 76
78
(DECK ASSEMBLY)
ACE HEAD ASSEMBLY
AUDIO
HEAD
AUDIO
ERASE
HEAD
FE HEAD
FULL
ERASE
HEAD
CN287
A-PB/REC 4
A-COM 3
AE-H 1
AE-H/FE-H 2
CN504
7 A-PB/REC
6 A-COM
4 AE-H
5 FE-H
CN501
1 FE-H
2 FE-H-GND
Q402
BIAS
OSC
P-ON+5V
Q404 (PB=ON)
Q403
Q405
(PB=ON)
Q401
SWITCHING
D-REC-OFF
P-ON+5V
99
4
3
PB-ON
EQ
AMP
SP/LP-ON
AUTO
BIAS
LINETUNER
ALC
REC
AMP
LINE
AMP
1030
MUTE
ALC
DET
SERIAL
DECODER
23 24
96
97
98
I2C BUS SDA-1
I2C BUS SCL-1
A-MUTE-H
D-REC-H
TO SERVO/SYSTEM
CONTROL BLOCK
R
1
2
6
100
P
7
1-10-5 1-10-6 H87T4BLA
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