Service Test Programme - Grundig GV 27 Servicehandbuch

Service Test Programme & Special Functions
Service Test Programme & Special Functions

1. Service Test Programme

Calling up, Checking the Levels of and Terminating the Service Test
Programme
The service test programme can be called from any tape drive function
other than the data entry functions (station search, ...). While it is
operating in the service mode, the VCR remains fully operational in all
tape drive functions.
• Calling up the Service Test Programme
Press the (STOP) button on the remote control and the
button on the video recorder in that order and hold them down for at
least 5 seconds.
The display will then show the values of Level 00.
• Checking the Levels of the Service Test Programme
The service test programme is made up of the following levels:
Level 00 – mask no. of the tape deck and keyboard control computer
Level 01 – tape deck position
Level 02 – error code and error status / VCR function
Level 03 – man. tracking, tape deck sensors and VCR function
Level 04 – operating hours meter
Level 10 – tape deck sensors and VCR function without drive to the
tape deck
Level 40 – VCR option codes
Level 51 – headwheel position indicator adjustment
Level 52 – ACC adjustment (Automatic Contour Control, option)
Level 53 – timer clock adjustment
Level 60 – audio level adjustment of IC7780 (FV)
Level 61 – audio channel separation of IC7780 (FV)
Level 62 – standard sound playback level of IC7850 (AF)
Level 99 – timer clock output
Level Selection
– Before selecting the adjustment levels (51...62) remember to
prepare the respective level first (see description of the individual
levels of the service test programme given below).
– Press the "SELECT" button on the remote control. The indication
of the level flashes on the display.
– With the "+" or "–" button switch over to the respective level or
select the desired level directly with the buttons "0...9".
– Confirm the entered figures with the "SELECT" button.
On selection of an unused level the indication "--" flashes on the
display.
• Terminating the Service Test Programme:
Press the "STANDBY" button or disconnect the VCR from the
mains.
Levels of the Service Test Programme
Level 00: Mask No. of Tape Deck and Keyboard Control Computers
The mask number of the individual computers is indicated as follows:
Tape Deck Computer
Level 01: Tape Deck Position
The tape deck position code indicates the position of the cassette
compartment and of the threading roller units.
Tape Deck Positions
Eject
Index
Stop threaded out
Play position
Play reverse
2 - 4
(Play)
Keyboard Control Computer
Code
005...009
189...191
196...204
209...217
237...239
– Tape deck position and function of the Init switch
The diagram shows the function of the Init switch dependent on the
tape deck position. For this, the number of the threading tacho
pulses (FTA) is important. These signals are generated by the
threading tacho generator (butterfly sensor) which is mechanically
connected with the threading motor.
DC, 2V/Div, 0.5s/Div
Cassette in
Cassette down
Level 02: Error Code and Error Status / VCR Function
The last error status and error code that occurred is stored in the
EEPROM and is saved even if the VCR is disconnected from the
mains. The data can be cleared by pressing the "CLEAR" button on the
remote control.
Drive Mechnism Error Code
0 No Error
1 Threading error
2 No capstan tacho
3 Tape torn
Drive Mechnism Error Status / VCR Function
012 Standby
014 Tracking
031 Picture search reverse (3x)
034 Slow reverse
041 Still
042 Picture search forward (3x)
044 Picture search reverse (9x)
045 Threaded out
046 Picture search forward (9x)
047 Play reverse
048 Record – Pause
050 Rewind
052 Wind
053 Play
054 Stop
055 Record
112 Next index
113 Previous index
114 Write VISS marks
115 Clearing VISS marks
125 Tuner
126 Auto Remain
130 ATTS
168 Frame forward
169 Frame reverse
170 Picture search reverse (11x)
171 Picture search reverse (7x)
– Monitoring the tape deck functions
For monitoring the tape deck functions the tape deck is fitted with
sensors which supply the following tacho signals according to the
functions:
– WTR – reel right
– WTL – reel left (option)
– FTA – threading tacho
– FG – capstan motor
– PG/FG – headwheel motor
When one tacho pulse is missing during the operation of the tape
deck, the VCR tries to move the cassette compartment to the
"EJECT" position.
GV 27 ..., GV 47 ..., GV 7...
Init switch
Threading pulse (FTA)
Play reverse
Play
Index, wind-rewind
4 Missing left reel tacho (option)
5 Missing right reel tacho
6 Headwheel motor error
172 Picture search reverse (5x)
173 Picture search forward (5x)
174 Picture search forward (7x)
175 Picture search forward (11x)
196 EE mode
197 Standby Eject
199 Audio Dubbing
202 Audio Dubbing Pause
206 Reset Tapecounter
211 Slow (1/24)
212 Slow (1/14)
215 Slow (1/7)
216 Slow (1/2)
217 Slow reverse (1/24)
218 Slow reverse (1/14)
219 Slow reverse (1/7)
220 Slow reverse (1/2)
222 Sychro-Edit-Record
223 Auto Gap Position Adjustment
238 Pause
239 ACC Adjustment
246 Synchro-Edit-Pause
247 Slow (1/10)
248 Slow (1/18)
249 Slow reverse (1/10)
250 Slow reverse (1/18)
253 Keyboard Enable
GRUNDIG Service