Panasonic PV-M2738 Operating, Service Manual

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MODEL MARK
PV-M2738 A
PV-M2768 B
PV-M2768-K C
Not Used Z
Use Marks shown in the chart below to distinguish the
different models included in this Service Manual.
SAFETY PRECAUTIONS ................................................ 1-1
X-RADIATION .................................................................. 1-1
PREVENTION OF ESD TO ES DEVICES ....................... 1-2
OPERATION GUIDE ....................................................... 1-3
SERVICE NOTES ............................................................ 1-8
IC, Transistor and Chip Part Information .................... 1-19
DISASSEMBLY/ASSEMBLY PROCEDURES
Disassembly/Assembly
Procedures of Cabinet .............................................. 2-1
Disassembly/Assembly
Procedures of Mechanism ........................................ 2-7
Disassembly/Assembly
Procedures of Cassette Up Ass'y ............................ 2-17
ADJUSTMENT PROCEDURES
Service Fixtures and Tools ......................................... 2-19
Mechanical Adjustment .............................................. 2-20
Electrical Adjustment .................................................. 2-26
Test Points and Control Location ............................... 2-33
SCHEMATIC DIAGRAMS
Schematic Diagram
and Circuit Board Layout Notes ................................ 3-1
Capstan Stator Schematic Diagrams ........................... 3-2
Stereo Amp Schematic Diagram .................................. 3-4
Main I (Power Supply/System Contro/Servo)
Schematic Diagram ................................................... 3-7
Main II (Signal Process/OSD
/Audio Amp) Schematic Diagram ............................ 3-11
Main III (TV Y/C Process) Schematic Diagram .......... 3-15
Main IV (Power Supply) Schematic Diagram ............. 3-19
UHF/VHF Tuner/TV Demodulator
Schematic Diagram ................................................. 3-19
TV Main / CRT / TV Power
/ TV Main Child Schematic Diagram ....................... 3-23
Hi-Fi Audio Schematic Diagram ................................. 3-27
TV Stereo Schematic Diagram ................................... 3-31
Audio/Video Jack Schematic Diagram ....................... 3-35
Operation I/II Schematic Diagram .............................. 3-37
Head Amp Schematic Diagram .................................. 3-39
Hi-Fi Audio/Video Head Amp
Schematic Diagram ................................................. 3-42
Interconnection Schematic Diagram ........................... 3-45
CIRCUIT BOARD LAYOUT
Stereo Amp C.B.A. ....................................................... 4-1
Main (Power Supply/Signal Process
/OSD/Audio Amp/System Control
/Servo/TV Y/C Process) C.B.A. ................................. 4-2
Junction C.B.A. ............................................................. 4-4
TV Main C.B.A. ............................................................. 4-6
CRT C.B.A. ................................................................... 4-8
Head Amp C.B.A. ......................................................... 4-8
TV Stereo C.B.A. .......................................................... 4-9
Hi-Fi Audio C.B.A. ......................................................... 4-9
Hi-Fi Audio/Video Head Amp C.B.A. .......................... 4-11
Operation I/II C.B.A. ................................................... 4-12
TV Main Child C.B.A. .................................................. 4-12
TV Power C.B.A. ......................................................... 4-14
Audio/Video Jack C.B.A. ............................................ 4-15
Capstan Stator Unit .................................................... 4-15
Signal Waveform ........................................................ 4-16
BLOCK DIAGRAMS
Power Supply Block Diagram ....................................... 5-1
Video Signal Path Block Diagram ................................. 5-2
Audio Signal Path Block Diagram ................................. 5-3
Hi-Fi Audio Signal Path Block Diagram ........................ 5-5
Stereo Amp Block Diagram .......................................... 5-8
TV Stereo/Stereo Amp Block Diagram ......................... 5-9
System Control Block Diagram ................................... 5-10
Servo Block Diagram .................................................. 5-11
TV Y/C Process/OSD/CCV
/TV Main Block Diagram ......................................... 5-13
Troubleshooting Hints ................................................. 5-16
EXPLODED VIEWS
1. Mechanism (Top) Section ......................................... 6-1
2. Mechanism (Bottom) Section ................................... 6-2
3. Cassette Up Compartment Section .......................... 6-3
4. Chassis Frame Section (1) ....................................... 6-4
5. Chassis Frame Section (2) ....................................... 6-5
6. Packing Parts and Accessories Section ................... 6-6
REPLACEMENT PARTS LISTS
Replacement Notes ...................................................... 7-1
Mechanical Replacement Parts List ............................. 7-2
Electrical Replacement Parts List ................................. 7-3
TABLE OF CONTENTS
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WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service information by anyone else could result in serious injury or death.