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The manual was of good quality with high resolution schematic diagrams.
The manual was very clear and contained all the information I was looking for. My dishwasher is working again because of this servicemanual!
Quality scan, great manual. I solved my problem with this manual.
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.
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!!!!
GV 31â¦, GV 51â¦, GV 61â¦
J KI L
B468 K340 K330 B478
3.16 Threading roller unit â Release the locking lug P (Fig. 11) then remove the loading drive gear (B484, Fig. 2). â Slide the threading roller units (G420 / G450, Fig. 18) in the "Thread" position then remove the threading arms (B500 / B488). â Remove the left reel brake (point 3.10). â Slide the right threading roller unit (G450, Fig. 19) in threading direction then remove it. â Remove the back tension arm (point 3.11). â Slide the left threading roller unit (G420, Fig. 19) in unthreading direction then remove it. Reassembly is carried out in reverse order. Note on reassembly: â Insert the threading arms so that the holes M / N (Fig. 18) face each other in the "Thread" drive mechanism position. â Insert the loading drive gear (B484, Fig. 13) in the "Unthread" drive mechanism position so that the hole I and the mark J on the threading arm face each other as shown in Fig. 13, and the mark L on the control slide (B464) is visible through the hole K. Press the control slide against the guides R then lock in the loading drive gear (B484).
3.14 Idler wheel â Remove the reel brakes (point 3.9 / 3.10). â Slide the idler wheel (K182, Fig. 14) towards the rear of the drive mechanism then remove it. Reassembly is carried out in reverse order.
3.15 Gear drive â Remove the idler wheel (K182) (point 3.14) â Remove the right reel. â Remove the reel belt (G542, Fig. 2). Remove the lock washer S (Fig. 15). Remove the pulley (K200, Fig. 15). Remove the control slide (point 3.13) Release the locking lugs T (Fig. 15) then remove the gear drive (K221). Reassembly is carried out in reverse order. Note on reassembly: â The slide disk of the gear drive (K221, Fig. 16) must be located in the guide U of the switching claw (K225) when reassembling. â The pulley (K200, Fig. 17) must be inserted so that the spring is located in the opening of the slide disk. S K222
3.17 Full erase head â Turn the full erase head (G530, Fig. 19) counterclockwise then remove it.
â â â â
G530 G420 G450
T Fig. 15
3-18 Tape reverse guide lever â Remove the pinch roller unit (point 3.8). â Unhook the spring G527 (Fig. 20). â Turn the tape reverse guide lever (G520, Fig. 20) in direction of the arrow "A" then remove it in direction of the arrow "B". Reassembly is carried out in reverse order.
"A" G527 G520 "B"