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SERVICE MANUAL
Sec. 1: Main Section Sec. 2: Deck Mechanism Section Sec. 3: Exploded views
q Specifications q Standard Maintenance and Parts List Section
q Preparation for Servicing q Alignment for Mechanism q Exploded views
q Adjustment Procedures q Disassembly/Assembly of Mechanism q Parts List
q Schematic Diagrams q Alignment Procedures of Mechanism
q CBA' s
VIDEO CASSETTE RECORDER
23C-250
23C-250A
PAL
H7700CVR
MAIN SECTION
VIDEO CASSETTE RECORDER
23C-250 / 23C-250A
Sec. 1: Main Section
q Specifications
q Preparation for Servicing
q Adjustment Procedures
q Schematic Diagrams
q CBA' s
TABLE OF CONTENTS
Specifications..................................................................................................................................................... 1-1-1
Important Safety Precautions............................................................................................................................. 1-2-1
Standard Notes for Servicing ............................................................................................................................. 1-3-1
Preparation for Servicing ................................................................................................................................... 1-4-1
Cabinet Disassembly Instructions...................................................................................................................... 1-5-1
Electrical Adjustment Instructions ...................................................................................................................... 1-6-1
Block Diagrams.................................................................................................................................................. 1-7-1
Function Indicator Symbols................................................................................................................................ 1-7-11
Schematic Diagrams / CBA' s and Test Points .................................................................................................. 1-8-1
Waveforms......................................................................................................................................................... 1-9-1
Wiring Diagram .................................................................................................................................................. 1-10-1
IC Pin Function ...................................................................................................................................................1-11-1
Lead Identifications ............................................................................................................................................ 1-12-1
H7700CVR
SPECIFICATIONS
Description Unit Minimum Nominal Maximum Remark
1. Video
1-1. Video Output (PB) Vp-p 0.8 1.0 1.2 FL6A
1-2. Video Output (R/P) Vp-p 0.8 1.0 1.2
1-3. Video S/N Y (R/P) dB 40 45 SP Mode,
W/O Burst
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 -11 -4 SP Mode
(-20dB ref. 1kHz) at 8kHz dB -14 -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
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 H8740SP
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice I. Also check areas surrounding repaired locations.
J. Use care that foreign objects (screws, solder drop-
Some electrical and mechanical parts have special
lets, etc.) do not remain inside the set.
safety-related characteristics which are often not evi-
dent from visual inspection, nor can the protection they K. Crimp type wire connector
give necessarily be obtained by replacing them with The power transformer uses crimp type connectors
components rated for higher voltage, wattage, etc. Parts which connect the power cord and the primary side
that have special safety characteristics are identified by
a on schematics and in parts lists. Use of a substi-
tute replacement that does not have the same safety
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to prevent
shock hazards.
characteristics as the recommended replacement part
Replacement procedure
might create shock, fire, and/or other hazards. The
Product's Safety is under review continuously and new 1) Remove the old connector by cutting the wires at a
instructions are issued whenever appropriate. Prior to point close to the connector.
shipment from the factory, our products are carefully Important: Do not re-use a connector. (Discard it.)
inspected to confirm with the recognized product safety
2) Strip about 15 mm of the insulation from the ends of
and electrical codes of the countries in which they are
the wires. If the wires are stranded, twist the strands
to be sold. However, in order to maintain such compli-
to avoid frayed conductors.
ance, it is equally important to implement the following
precautions when a set is being serviced. 3) Align the lengths of the wires to be connected. Insert
the wires fully into the connector.
Precautions during Servicing 4) Use a crimping tool to crimp the metal sleeve at its
A. Parts identified by the symbol are critical for
safety. Replace only with part number specified.
center. Be sure to crimp fully to the complete closure
of the tool.
L. When connecting or disconnecting the internal con-
B. In addition to safety, other parts and assemblies are
nectors, first, disconnect the AC plug from the AC
specified for conformance with regulations applying
outlet.
to spurious radiation. These must also be replaced
only with specified replacements.
Examples: RF converters, RF cables, noise block-
ing 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, fus-
ible 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.
1-2-1 H8740SFP
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 speci- Chassis or Secondary Conductor
fied values to verify compliance with safety standards.
Primary Circuit Terminals
1. Clearance Distance
When replacing primary circuit components, confirm d' d
specified clearance distance (d) and (d') between sol-
dered terminals, and between terminals and surround-
ing metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
AC Line Voltage Clearance Distance (d) (d')
3mm(d)
230 V
6 mm(d')
Note: This table is unofficial and for reference only.
Fig. 1
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current be-
tween B (earth ground, power cord plug prongs) and Exposed Accessible Part
externally exposed accessible parts (RF terminals, an-
tenna terminals, video and audio input and output ter-
minals, microphone jacks, earphone jacks, etc.) is lower
than or equal to the specified value in the table below.
AC Voltmeter
Measuring Method (Power ON) : Z (High Impedance)
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.
One side of
B
Power Cord Plug Prongs
Fig. 2
Table 2 : Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i) One side of power cord plug
prongs (B) to:
2k RES. i0.7mA AC Peak RF or
Connected in
parallel i2mA DC Antenna terminals
230 V
50k RES.
Connected in i0.7mA AC Peak A/V Input, Output
i2mA DC
parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
1-2-2 H8740SFP
STANDARD NOTES FOR SERVICING
Circuit Board Indications How to Remove / Install Flat Pack-IC
a. The output pin of the 3 pin Regulator ICs is indicated 1. Removal
as shown.
With Hot-Air Flat Pack-IC Desoldering Machine:
(1) Prepare the hot-air flat pack-IC desoldering ma-
Top View Bottom View chine, then apply hot air to the Flat Pack-IC (about
Input 5 to 6 seconds). (Fig. S-1-1)
Out In
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
5
Pin 1 Fig. S-1-1
(2) Remove the flat pack-IC with tweezers while apply-
10 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
c. The 1st pin of every male connector is indicated as
soldering iron to center of the flat pack-IC and heat
shown.
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)
Pin 1
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.
Instructions for Connectors (Fig. S-1-2)
1. When you connect or disconnect the FFC (Flexible 2. The flat pack-IC on the CBA is affixed with glue, so
Foil Connector) cable, be sure to first disconnect the be careful not to break or damage the foil of each
AC cord. pin or the solder lands under the IC when removing
2. FFC (Flexible Foil Connector) cable should be in- it.
serted parallel into the connector, not at an angle.
Hot-air
Flat Pack-IC
Desoldering
Machine
FFC Cable CBA
Connector
CBA
Masking Flat Pack-IC
Tape
* Be careful to avoid a short circuit.
Tweezers Fig. S-1-2
1-3-1 NOTE_1
With Soldering Iron: (4) Bottom of the flat pack-IC is fixed with glue to the
(1) Using desoldering braid, remove the solder from all CBA; when removing entire flat pack-IC, first apply
pins of the flat pack-IC. When you use solder flux soldering iron to center of the flat pack-IC and heat
which is applied to all pins of the flat pack-IC, you up. Then remove (glue will be melted). (Fig. S-1-6)
can remove it easily. (Fig. S-1-3) (5) Release the flat pack-IC from the CBA using tweez-
ers. (Fig. S-1-6)
Flat Pack-IC
Note:
Desoldering Braid
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.
Soldering Iron
Hot Air Blower
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 or
adhere (iron wire). When heating the pins, use a fine
tip soldering iron or a hot air desoldering machine.
(Fig. S-1-4) Iron Wire
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
Sharp
Pin
Fine Tip Fig. S-1-4 Fine Tip
Soldering Iron CBA Soldeing 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)
Flat Pack-IC
With Iron Wire: Tweezers
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux Fig. S-1-6
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.
1-3-2 NOTE_1
2. Installation Instructions for Handling
(1) Using desoldering braid, remove the solder from the Semiconductors
foil of each pin of the flat pack-IC on the CBA so you
Electrostatic breakdown of the semiconductors may
can install a replacement flat pack-IC more easily.
occur due to a potential difference caused by electro-
(2) The " q " mark on the flat pack-IC indicates pin 1. static charge during unpacking or repair work.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then 1. Ground for Human Body
pre- solder the four corners of the flat pack-IC. (See Be sure to wear a grounding band (1M) that is properly
Fig. S-1-8.) grounded to remove any static electricity that may be
(3) Solder all pins of the flat pack-IC. Be sure that none charged on the body.
of the pins have solder bridges.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate with
Example : proper grounding (1M) on the workbench or other
surface, where the semiconductors are to be placed.
Because the static electricity charge on clothing will not
escape through the body grounding band, be careful to
avoid contacting semiconductors with your clothing.
< Incorrect >
Pin 1 of the Flat Pack-IC
is indicated by a " q " mark.
Fig. S-1-7
Presolder CBA
< Correct >
Grounding Band
Flat Pack-IC
CBA
Fig. S-1-8
1M
CBA
1M
Conductive Sheet or
Copper Plate
1-3-3 NOTE_1
PREPARATION FOR SERVICING
How to Enter the Service Mode About REC-Safety Switch
Caution:
About Optical Sensors The REC-Safety Switch is directly mounted on the Main
CBA. When the Deck Mechanism Assembly is removed
Caution: from the Main CBA for servicing, this switch does not
An optical sensor system is used for the Tape Start and work automatically.
End Sensors on this equipment. Carefully read and
What to do for preparation
follow the instructions below. Otherwise the unit may
operate erratically. In order to record, press the Rec button while pushing
REC-SAFETY SW on the Main CBA. See Fig. 1.
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 TP502 (SENSOR INHIBITION) to GND.
CN504 CN506
This will stop the function of Tape Start Sensor, Tape
CN501 CN251
End Sensor and Reel Sensors. (If these TPs are con-
Q503
nected before plugging in the unit, the function of the Q504
CN503
sensors will stay valid.) See Fig. 1.
SW506 TP502
Note: Because the Tape End Sensors are inactive, do S-INH
not run a tape all the way to the start or the end of the
tape to avoid tape damage.
(REC-SAFETY SW)
Fig. 1
1-4-1 H8740PFS
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart 1 : Identification (location) No. of parts in the figures
This flowchart indicates the disassembly steps to gain 2 : Name of the part
access to item(s) to be serviced. When reassembling, 3 : Figure Number for reference
follow the steps in reverse order. Bend, route, and dress 4 : Identification of parts to be removed, unhooked, un-
the cables as they were originally. locked, released, unplugged, unclamped, or
desoldered.
[1] Top Case
P=Spring, L=Locking Tab, S=Screw,
CN=Connector
[2] Front Assembly *=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
[3] Jack CBA 2(L-2) = two Locking Tabs (L-2)
5 :Refer to "Reference Notes."
[4] Function CBA [5] Deck Assembly
Reference Notes
[7] REC Arm Assembly [6] Cylinder Shield CAUTION: Locking Tabs (L-1) and (L-2) are fragile. Be
careful not to break them.
[8] Main CBA 1. Disconnect Connector (CN505) to remove Function
CBA. Hold Main CBA while pulling up on the Func-
tion CBA. (Fig. 4)
Disassembly Method 2. Remove six Screws (S-3) and the Spacer. Then
slowly lift the Deck Assembly up. Lifting Deck As-
REMOVAL sembly disconnects five Connectors (CN251,
ID/ REMOVE/ CN501, CN503, CN504, CN506) . (Fig. 5)
LOC. PART Fig. *UNHOOK/UNLOCK/ Note
No. 3. When reassembling the unit, always reinsert Lock-
No. RELEASE/UNPLUG/ ing Tabs (L-4), and then reinstall Screws (S-5).
DESOLDER
These screws are critical for proper shielding of the
[1] Top Case 1 6(S-1) - Main CBA. (Fig. 7)
Front 2 *3(L-1), *4(L-2) 4. Before installing the Deck Assembly, be sure to
[2] -
Assembly place the pin of LD-SW on Main CBA as shown in
[3] Jack CBA 3 3(S-2), (CN101) - Fig. 7. Then, install the Deck Assembly while align-
Function 2, 4 *(L-3), (CN505) ing the hole of Cam Gear with the pin of LD-SW, the
[4] CBA 1 shaft of Cam Gear with the hole of LD-SW as shown
in Fig. 7.
Deck 5,7 6(S-3), Spacer
Assembly *(CN251, CN501,
[5] 2, 4
CN503, CN504,
CN506)
[6] Cylinder 5 2(S-4) -
Shield
[7] REC Arm 5 ---------- -
Assembly
[8] Main CBA 6 3(S-5), *2(L-4) 3
1-5-1 H8740DC
(S-1) [1]Top Case
(S-1)
(L-3)
Lift PCB up and
over tab
[4] Function CBA
[8] Main CBA CN505
(S-1) Fig. 4
Spacer
(S-3)
(S-3) (S-4)
Fig. 1
[7]REC Arm
[6]Cylinder
Assembly
Shield
(L-2)
[5]Deck Assembly
[4]Function C.B.A.
(L-2)
CN501
(L-1) [2]Front Assembly CN251
CN506
CN503
Fig. 2 CN504
Fig. 5
(S-2)
(S-2)
CN101
(S-2)
[3] Jack CBA
Fig. 3
1-5-2 H8740DC
(S-5)
(L-4) [8]Main C.B.A.
(L-4)
Fig. 6
Triangle Marks
SW507
LD-SW
[8]Main C.B.A.
[5]Deck Assembly
Cam Gear
Hole
Shaft
Hole
LD-SW Pin
[8]Main C.B.A.
Fig. 7
1-5-3 H8740DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is an abbreviation for "Circuit 1. Head Switching Position
Board Assembly".
Adjustment
Notes:
Purpose: To determine the Head Switching point dur-
1. Electrical adjustments are required after replacing ing playback.
circuit components and certain mechanical parts. It
is important to do these adjustments only after all Symptom of Misadjustment: May cause Head
repairs and replacements have been completed. Switching noise or vertical jitter in the picture.
Also, do not attempt these adjustments unless the Test Point Adj. Point Mode Input
proper equipment is available.
TP751(V-OUT)
2. To perform these alignment / confirmation proce- TP502(RF-SW) VR501 (SW-P) PLAY ----
dures, make sure that the tracking control is set in (SP)
GND
the center position: Press either channel "w" or "v" Measurement
button first, then the " PLAY " button (VCR's Front Tape Spec.
Equipment
Panel only).
6.5H±1H
FL6A Oscilloscope
(412.7±60µs)
Test Equipment Required
1. Oscilloscope: Dual-trace with 10:1 probe, V-Range: Connections of Measurement Equipment
0.001~50V/Div., F-Frange: AC~DC-20MHz
Oscilloscope
2. Alignment Tape ( FL6A )
TP751
CH1 CH2
Main CBA GND
TP502
Trig. (+)
Figure 1
EXT. Synchronize Trigger Point
V-Sync
CH1
1.0H 0.5H
6.5H
CH2
Switching Pulse
Reference Note:
TP502, TP751, VR501 : Main CBA
· Play back the test tape and adjust VR501 so that the
V-sync front edge of the CH1 video output wave-
form is at the 6.5H(412.7µs) delayed position from
the rising edge of the CH2 head switching pulse
waveform.
1-6-1 H8740EA
Servo/System Control Block Diagram BLOCK DIAGRAMS
AL+5V IC501 TP507
MAIN CBA FUNCTION CBA
(SERVO/SYSTEM CONTROL) S-INH
RS501
D555 REMOTE KEY
1 REMOCON KEY-1 72 CN505 CN651
S-LED SENSOR SWITCH
2 KEY-2 2 KEY SWITCH
19 REC-CTL(+) KEY-2 73
20 REC-CTL(-)
TP501
(DECK ASSEMBLY) FIP501
GND
F I P
AC HEAD ASSEMBLY IC503 (1/3)
CN287 CN504 G1 83
13 +
CONTROL 5 CTL(+) 8 10 + - 14 54 PB-CTL
HEAD - 8 12 G6 88
6 CTL(-) 9 9
TP501 CTL SW507
AL+5V
LD-SW P1 93
74 LD-SW
P6 98
IC506 (DRUM /LOADING MOTOR DRIVE) P-ON+5V
CYLINDER ASSEMBLY P7 92
CN506
D-W 1 25
DRUM 14 56 D-CONT P10 89
DRUM D-V 2 24
MOTOR
M D-U 3 22
MOTOR
DRIVE 20 52 D-FG
D-COM 4 21
PG PG-IN 5 IC505 (MEMORY)
SENSOR
16 + 18 53 D-PG
- 6 SCL
15
17 REC-SAF-SW 25 AL+5V 5 SDA
SW506
4 LOADING REC-SAFETY
DRIVE MOTOR 9 59 LM- TU701
2 FWD/REV
CONTROL 5 SCL
I2C BUS SCL-2 4 11 SCL
I2C BUS SDA-2 5 12 SDA
3 SDA
TP506
LOADING MOTOR ASSEMBLY END-S
CN504
LOADING LD-M(-) 1 A-MUTE-H
MOTOR M LD-M(+) 2 75 ST-S A-MUTE-H 60
D-REC-H
68 END-S D-REC-H 62 TO AUDIO
I2C BUS SCL-1 BLOCK
49 T-REEL I2C BUS SDA-1
50 S-REEL
Q503 Q504 Q506 PS502
ST-S END-S T-REEL S-REEL
SECAM-H
CAPSTAN MOTOR SECAM-H 23
TRICK-H
TRICK-H 47
Q501 SECAM-CHARA-H
SECAM-CHARA-H 2
TIMER+5V RESET 34 RESET I2C BUS SCL-1
CN503 I2C BUS SCL-1 10 TO VIDEO
I2C BUS SDA-1 BLOCK
C-F/R 1 66 C-F/R I2C BUS SDA-1 9
CAPSTAN V-ENV
M P-ON+5V 2 P-ON+5V SW508 V-ENV 70
MOTOR C-ROTA
AL+15V/+12V 3 AL+15V/+12V RESET C-ROTA 15
RF-SW
C-FG 4 51 C-FG RF-SW 17
C-POW-SW 5 46 C-POW-SW
C-DRIVE 6 55 C-CONT
I2C BUS SDA-1
FG-GND 7 AL+5V
VR501 I2C BUS SCL-1 TO JACK
CM-GND 8
SW-POINT DEC-L BLOCK
71 PG-DELAY DEC-L 79
1-7-1 1-7-2 H8743BLS
Video Block Diagram REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
IC370 (PAL/SECAM DECTECOTR) SECAM CBA
TP751 V-OUT WF1 MAIN CBA SECAM-CHARA-H Q371
TO CN101 CN751 Q305 CN371 CN370 BUFFER 26
TO SERVO/SYSTEM SECAM-H
V-OUT 7 BUFFER 7 SECAM-H 7 26
FROM/TO CONTROL BLOCK TRICK-H
V-IN 5 8 TRICK-H 8 1
JACK BLOCK
TU-VIDEO 19 10 REC-C OUT 10
Q372
BUFFER 17 PAL/SECAM
1 C-SYNC 1 27 DETECTOR
5 VXO/XO/OUT2 5 2
3 VIDEO-SW 3 15
Q310 Q311 9 C-PB 9 13
AMP BUFFER
Q309
Q307 Q304 I2C BUS SDA-1 TO
X302 BUFFER BUFFER I2C BUS SCL-1 SERVO/SYSTEM
4.43MHz CONTROL BLOCK
IC301
(Y/C PROCESS) 29 67 66 49 43 45 46 41 20 21 24 23
VXO
CCD 1H SERIAL
DELAY CLAMP CLAMP DECORDER
AMP
CHARA
INS.
DETAIL
B/B ENH
R/P R
1/2 R P V/I SUB FM DOUBLE
Y-LPF CONV LPF DEMOD. LIMIT 17
FBC P
TU701 DOC YNR Y/C COMB
EE R P NOISE M
TU-VIDEO 24 38 32 31 CANCEL DE EMPA
AGC
Q302, PEAKING
Y/C PIC-CTL W/D FM REC Q303 AMP
MIX ANR CLIP MOD FM-EQ NL
EMPHA
IC501 19
C-SYNC 21 28 C-SYNC
BPF
OSD-CHARA-OUT 31 26 R P
OSD-BB-OUT 30 25 CLAMP BPF
D-V SYNC 33 BUFFER 27 D-V SYNC P KILL R P REC FM
BPF MAP B.D.
Q308