GV 26 EURO, GV 6000 EURO, GV 6300 EURO
General Section
GRUNDIG Service
1 - 17
– VCR function
The VCR function code (see Level 02 – Error Status / VCR Function
Table) indicates the position of the cassette compartment and of the
threading roller units.
MAN
LP
VPS PDC
2
1
TIMER
STOP
VCR function
Level
End of tape
Left reel tacho
(option)
Init swith
Record protection
Threading tacho
Right reel tacho
Beginning of tape
Level 04: Operating Hours Meter
The operating hours meter indicates the number of hours the headwheel
has been rotating.
MAN
LP
VPS PDC
2
1
TIMER
STOP
Operating Hours Meter
Level
Level 10: Tape Deck Sensors and VCR Function
without Drive to the Tape Deck
At this level, the tape deck sensors are indicated on the display as
explained at Level 03. Additionally, the VCR functions can be selected
and the respective signal paths are released for fault finding (without
tape deck).
The tape deck is not driven at this level.
Level 40: VCR Option Codes
The VCR option codes "A"…"F" serve the purpose of activating the
respective software of the different VCR versions stored in the mask-
programmed
µ
C's. The option code is stored in the EEPROM
– When calling up Level 40 the request for entering option code "A"
(
MAN
LP
VPS PDC
2
1
TIMER
STOP
) appears on the display.
– Select the desired option code "A"…"F" with the "–" or "+" button.
– Enter the option code for example option code "A":
– Enter option code "A", see VCR type plate (e.g. "004") on the
remote control.
Attention: All functions will be available only if the option code
has been entered correctly.
– Confirm the entered code with the "STORE" button on the
recorder.
For checking the entered code, the display shows for
approximately 5s the option code "A" as a hexadecimal number,
e.g. "
MAN
LP
VPS PDC
2
1
TIMER
STOP
".
Subsequently, the VCR switches automatically back to the
request for entering the next option code.
– The option codes "B"…"F" are entered in the same way as option
code "A".
– Checking the option codes:
– The hexadecimal option codes can be checked by pressing the
"STORE" button on the VCR without previously entering an option
code.
Level 51: Headwheel Position Indicator Adjustment
This adjustment is necessary on replacement of the headwheel or
EEPROM (IC7890).
Preparation before calling up this level:
– Play the test cassette.
This adjustment is started automatically on calling up the level. On
successful completion the resulting value is stored in the EEPROM.
Afterwards the VCR switches to stand by mode.
If the adjustment is not carried out successfully the VCR ejects the test
cassette. Cause: Test cassette, headwheel or technical defect (e.g.
µ
C)
Level 52: ACC Adjustment (Automatic Contour Control, optional)
The ACC needs to be adjusted on replacement of the headwheel or
EEPROM (IC7890)
Preparation before calling up this level:
– Feed in a red raster test pattern
– Play back the record/play cassette.
This adjustment is started automatically on calling up this level
(recording
for 4s in SP/LP mode each and while playing back this recording the
VCR is adjusted). The resulting value is stored in the EEPROM on
successful completion of this adjustment. Afterwards the VCR switches
to stand by mode.
If the adjustment is not carried out successfully the VCR ejects the test
cassette. Cause: Test cassette, headwheel or technical defect (e.g.
µ
C).
Level 53: Timer Clock Adjustmnet
Preparation before calling up this level:
– Measure the timer clock output, Level 99, and note down the
measured value (f
mess
).
– Calculation of the correction value:
f
mess
= measured frequency
f
soll
= desired frequency (2048.0000Hz)
1 x 10
6
x (f
mess
– f
soll
)
f
soll
Deviation =
Deviation
0.763
Correction value =
+128
Example:
f
mess
= 2047.9700Hz
f
soll
= 2048.0000Hz
1 x 10
6
x (2047.97Hz – 2048Hz)
2048Hz
-14.648 =
-14.648
0.763
108.80 =
+128
Rounded correction value to be entered: 109
If the calculated correction value lies outside the range from 0…255
the quartz Q1297 may be technically defective.
Entering the correction value
– On calling up Level 53 the display shows the request for entering the
correction value (
MAN
LP
VPS PDC
2
1
TIMER
STOP
).
– Enter the correction value (rounded) and confirm the value by
pressing the "STORE" button on the VCR. For checking the entered
number, the display shows for approximately 5s the hexadecimal
correction value109 "
MAN
LP
VPS PDC
2
1
TIMER
STOP
".
Checking the correction value:
– The hexadecimal correction value can be checked by pressing the
"STORE" button on the VCR without previously entering the value.
Level 99: Timer Clock Output
For adjusting the timer clock at this level (Level 53), the timer oscillator
frequenacy (approx. 2048Hz) must be measured at plug contact 1921-(19)
"HEST" of the keyboard control (PDC) (resolution: 6 digits at least). Note
it down (f
mess
).
Note:
On selection of this level, the display is dark and no function of the VCR
is active. This level and the service test programme can be terminated
only by disconnecting the VCR from the mains.
Conversion Table Dual/Hexadecimal
right hexadecimal digit
0 1 2 3 4 5 6 7 8 9 A B C D E F
0
000 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015
1
016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 031
2
032 033 034 035 036 037 038 039 040 041 042 043 044 045 046 047
3
048 049 050 051 052 053 054 055 056 057 058 059 060 061 062 063
4
064 065 066 067 068 069 070 071 072 073 074 075 076 077 078 079
5
080 081 082 083 084 085 086 087 088 089 090 091 092 093 094 095
6
096 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111
left hexadecimal digit
7
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
8
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
9
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
A
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
B
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
C
192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
D
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
E
224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
F
240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
