Grundig GV-709M, GV-729M Schematic
SERVICE MANUAL
VIDEO
D
Btx * 32700
#
Service
Manual
GV 709 M
GV 729 M
Part No.
72010-527.55
Additionally required
Service Manuals for
the Complete Service:
Service
Manual
Safety
Part No.
72010-800.00
GV 709 M
GV 729 M
NTSC
PAL /ME/SECAM
GV 709 M (758636-1000 / G.MF 6600)
GV 729 M (758637-1000 / G.MF 6700)
Remote Control
Subject to alteration
Printed in Germany
VK 21/1 0896
Service Manual Part No. 72010-527.55
General GV 709 M, GV 729 M
The regulations and safety instructions shall be valid as provided by the "Safety" Service
Manual, part number 72010-800.00, as well as the respective national deviations.
GB
Table of Contents
Page
General................................................1-1…1-10
Test Equipment / Aids......................................................1-2
Specification.....................................................................1-2
Disassembly.....................................................................1-3
Mechanism Adjustment.....................2-1…2-16
Electrical Adjustment..........................3-1…3-3
Layout of PCB
and Circuit Diagrams.........................4-1…4-36
Schematic Diagram Notes...............................................4-1
Circuit Board Notes..........................................................4-2
Board Interconnections....................................................4-3
SYSTEM CONTROL Block Diagram...............................4-5
Video Block Diagram.......................................................4-7
Video Schematic Diagram...............................................4-9
System Control Schematic Diagram..............................4-11
Switching Regulator Schematic Diagram.......................4-13
Tuner Schematic Diagram.............................................4-15
Servo Schematic Diagram.............................................4-17
Front Schematic Diagram..............................................4-19
On Screen Schematic Diagram.....................................4-21
Waveforms.....................................................................4-23
Main Circuit Board.........................................................4-25
FDP Grid Assignment and Anode Connection...............4-27
Remote Control Schematic Diagram.............................4-28
General
Test Equipment / Aids
Variable isolating transformer Colour generator
Dual channel oscilloscope AF Generator
Digital multimeter Stabilized power supply
Millivoltmeter Frequency counter
Please note the Grundig Catalog "Test and Measuring Equipment" obtainable from:
Grundig electronics GmbH
Würzburger Str. 150
D-90766 Fürth/Bay.
Tel. 0911/703-0
Telefax 0911/703-4479
Part no.
Presetting unit.................................................75981-311.26
Test cassette...................................................75981-311.27
Back tension cassette gauge..........................75981-311.33
A/C head positioning tool................................75981-311.34
Roller driver.....................................................75981-311.35
You can order this test equipment from the Service organization. We refer to you that this test equipment is already
obtainable on the market.
Exploded Views.....................................5-1…5-2
Technical Information...........................6-1…6-1
Spare Parts List.....................................7-1…7-1
Specification
VHS-System
1
/2” video cassette recorder
Tape speed.................................2.339cm/s (Standard play)
Head to tape speed.........................4.84m/s (Standard play)
TV standard (GV 709 M)
CCIR, B/G, DK - PAL
TV standard (GV 729 M)
CCIR, DK, I - PAL
Record and playback of tapes with norm
PAL
MESECAM / NTSC (3,58) via A/V socket
Sound
Input via cinch socket............-8dBs, 50kΩ (0dB = 0.775V
Output via cinch socket...........-6dBs, 1kΩ (0dB = 0.775V
rms
rms
Video
Signal / noise ratio.....................approx. 43dB (unweighted)
Video resolution..............................................approx. 3MHz
Input via cinch socket....................................0.5…2Vpp, 75Ω
Output via cinch socket..........................................1V
Mains voltage..............................................110V~…240V~
Mains frequency...................................................50 / 60Hz
Power consumption........................................approx. 17W
Ambient temperature...................................+5°C … +40°C
Operating position...............................................horizontal
)
)
, 75Ω
pp
1 - 2 GRUNDIG Service
GV 709 M, GV 729 M Disassembly
GRUNDIG Service 1 - 3
Disassembly GV 709 M, GV 729 M
1 - 4 GRUNDIG Service
GV 709 M, GV 729 M Disassembly
GRUNDIG Service 1 - 5
Disassembly GV 709 M, GV 729 M
1 - 6 GRUNDIG Service
GV 709 M, GV 729 M Disassembly
GRUNDIG Service 1 - 7
Disassembly GV 709 M, GV 729 M
1 - 8 GRUNDIG Service
GV 709 M, GV 729 M Disassembly
GRUNDIG Service 1 - 9
Mechanism Adjustment GV 709 M, GV 729 M
2 - 1 GRUNDIG Service
GV 709 M, GV 729 M Mechanism Adjustment
2.1.4 Test equipment
Presetting unit Alignment tape Torque gauge Grease
75981-311.26 75981-311.27 75981-311.32 75988-034.74
Back tension cassette gauge A/C head positioning tool Roller driver
75981-311.33 75981-311.34 75981-311.35
GRUNDIG Service 2 - 2
Mechanism Adjustment GV 709 M, GV 729 M
Category Part No.
Oil 75981-311.30
Grease 75988-034.74
2 - 3 GRUNDIG Service
GV 709 M, GV 729 M Mechanism Adjustment
GRUNDIG Service 2 - 4
Mechanism Adjustment GV 709 M, GV 729 M
2 - 5 GRUNDIG Service
GV 709 M, GV 729 M Mechanism Adjustment
GRUNDIG Service 2 - 6
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