1 - 2 GRUNDIG Service
General GV 709 M, GV 729 M
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 = 0.775Vrms)
Output via cinch socket...........-6dBs, 1kΩ(0dB = 0.775Vrms)
Video
Signal / noise ratio.....................approx. 43dB (unweighted)
Video resolution..............................................approx. 3MHz
Input via cinch socket....................................0.5…2Vpp, 75Ω
Output via cinch socket..........................................1Vpp, 75Ω
Mains voltage..............................................110V~…240V~
Mains frequency...................................................50 / 60Hz
Power consumption........................................approx. 17W
Ambient temperature...................................+5°C … +40°C
Operating position...............................................horizontal
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 Equip-
ment" 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 organi-
zation. We refer to you that this test equipment is already
obtainable on the market.
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
Exploded Views.....................................5-1…5-2
Technical Information...........................6-1…6-1
Spare Parts List.....................................7-1…7-1
