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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+++++++++++++++++++++++++
Block diagrams
FTV1.9DE
6.
25
Supply voltage diagram
PR 31 MAINS INPUT PR 30 MAINS OUTPUT PRECON 1 PR 1 MAINS FILTER PRECON 3 PR 3 RELAY PR 3 7650 380V MC33368 PRECONDITIONER 3606 PTC FD TEMP A PREC B 5V VA SUPPLY 5V DOWN CONVERTER POWER OKE DETECTION VA VRA +/- AUDIO GND AUDIO 8V6 5V 8V6 3810 AVC-2 RGB-OUT +8Vc +5V POWER OKE AVC-3 VIDEO CONTROL +8Vb FAN SUPPLY OVER TEMP DETECTION PROTECTION CIRCUITS FAN CONTROL GND FAN SUPPLY FAN PROT 2360 DC PROT PROTECTION STATUS VRR DELAY VRR +8Vb +8Vb 3304 2302 +8Vb +5Vb 5201 2212 7223 TDA8714/T6 ADC +8Vb +5Vc +5Va 3293 +3V3 7218 74HCT4053D +3V3a +3V3b PD-5 SCAN-CONVECTOR + OSD 5309 5308 7320 I 2C +3V3a +3V3b +8Vb 7360 74HC4053N PD-4 BLUE-GAMMA + ADC 7300 TDA4885 I2 C +5V 1401 7358 MC33269D +3V3 2367 VAC1 & VAC2 5321 1400 3388 +5Vd 2351 FD FAN SUPPLY VS SUPPLY +5V 5320 3395 +5Vb 3360 +5Va 2350 VS VRS +5Vc 5V PD1
5680 5690
AVC-6 AUDIO PROCESSING +8Va 7970-A&B LM833D +5Vc +5Va AVC-7 AUDIO CONTROL +5Vb 3940 2940 8V6 +8Va +8Va 3491 AVC-8 AUDIO FILTER + DBE +8VA 3240 +4Va 3241 2240 5441 +5V STANDBY 6465 AVC-5 CONTROL 5493 +5Vb AVC-1 RGB-INPUT +5Vc +5Va 2952 7940 TDA9860 I 2C
PD-3 GREEN-GAMMA + ADC 3189 7168 74HCT4053D 5151 7173 TDA8714/T6 ADC +5Vd
PD-5 SCAN-CONVECTOR + OSD 5323 3393 2353 3418 I 2C
2372 7327 MC141585 PD-2 RED-GAMMA + ADC PD-6 PLL'S +3V3 3139 7118 74HCT4053D 5101 2112 7123 TDA8714/T6 ADC 5314 5315 5305 5335
AVC-6 AUDIO PROCESSING AUDIO AMPLIFIER 3561 +VSND RES 6568 6569 2568 2569 OND.PROC 3411 A 3400 2400 3406 3407 5V 5920 2923 5422 2313 Vdd-stby +5V AVC-6 AUDIO PROCESSING 6925 AVC-4 CONNECTOR DIAGRAM 1600 5V T200mA AVC-3 VIDEO CONTROL 3312 +5V 2312 3967 +5Vstby AVC-7 AUDIO CONTROL 2311 +5VA 7400 NVM I2C H24C16-BNG 7401 +5Vb 5V 5900 2903 7920 M6583OP I 2C 7910 M6583OP I 2C
µP
I2 C
P87C380AER
MAINS SWITCH
3569 SUPPLY ON STANDBY +5Vstby-switched -VSND RES
PR 2 STANDBY SUPPLY +5Vstby POR
+5Vstby
0335-A YKC21-3706
"HOT"
"COLD"
CL 96532058_003.eps 230999
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