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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
D-NF420/NF421
Ver. 1.3
Pin No. 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182, 183 184 185, 186 187 188 189, 190 191 192 193 194 195 196 197 198 199, 200 201 202 203 204 207
Pin Name FILO FILI PCO VSS12 DVDD3 VDIODSP SFDR SRDR TFDR TRDR FFDR FRDR MDP MDS C176 VDIOEM0 DVDD4 VSS14 PC3/XSCS0 PC2/SI0 PC1/SO0 PC0/SCK0 VSS15 VDIO5 PG7 PG6, PG5 PG4 PG3, PG2 PG1 PG0
DVDD5, DVDD6
I/O O I O O O O O O O O O O I O O I O O O I I I I I I I O I Filter output terminal for master PLL Filter input terminal for master PLL
Description
Charge pump output terminal for master PLL Ground terminal Power supply terminal (+1.3V) Power supply terminal (+2V) Sled servo drive signal (+) output to the motor/coil drive Sled servo drive signal (-) output to the motor/coil drive Tracking servo drive signal (+) output to the motor/coil drive Tracking servo drive signal (-) output to the motor/coil drive Focus servo drive signal (+) output to the motor/coil drive Focus servo drive signal (-) output to the motor/coil drive Spindle motor servo drive signal output to the motor/coil drive Not used 176.4 kHz clock signal output to the motor/coil drive Power supply terminal (+2V) Power supply terminal (+1.3V) Ground terminal Command latch signal output to the power control Serial data input from the FM/AM/TV tuner and EEPROM Serial data output to the power control and EEPROM Serial clock signal output to the power control and EEPROM Ground terminal Power supply terminal (+2V) Cold start flag input from the power control Not used Reset signal output to the liquid crystal display Not used Standby signal output to the optical pick-up block RF gain-up signal output for CD-RW to the optical pick-up block Power supply terminal (+1.3V) Ground terminal Power supply terminal (+2V) Ground terminal CD lid open/close switch input terminal Battery voltage monitor input terminal Wake up signal input from the power control Remote commander key input terminal (NF421: Russian, Singapore, Malaysia and Thai models only) Not used Top panel key input terminal (A/D input) DCIN voltage monitor input terminal Wake up signal input terminal Wake up signal output to the power control System reset signal input from the power control Power supply terminal (+1.2V) Ground terminal "L": close, "H": open Charge voltage monitor input from the power control
VSS18 AVDAD AVSAD AN7 AN6 AN5 AN4 AN3 AN2, AN1 AN0 WAKE XADEVENT XRST VSS19
205, 206 DVDBK0, DVDBK1
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