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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!
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SECTION 3 ELECTRICAL ADJUSTMENTS
Note : 1. The adjustments should be performed in the order given. (As a general rule the transmitter section (TMR-IF630R) adjustments should be completed before performing the headphones section (MDR-IF630R) adjustment.) 2. The adjustments and measurements should be performed for both L-ch and R-ch unless otherwise indicated. 3. L-ch adjustment should be completed before performing R-ch adjustment. 4. Supply 9 V dc to the transmitter section (TMR-IF630R) and 2.4 V dc to the headphones section (MDR-IF630R) as the power voltage. TRANSMITTER SECTION [ OSCILLATING FREQUENCY ADJUSTMENT ] Connection :
Frequency counter TX BASE board TP11 iL-ch j TP13 iR-ch j
[ RF LEVEL ADJUSTMENT ] Connection :
RF voltmeter TX BASE board TP11 (L-ch) TP13 (R-ch) TP15 (GND)
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Adjustment Procedure : No signal state. 1. Connect the RF voltmeter to TP11 (L-ch) and TP13 (R-ch) on the TX BASE board. 2. Adjust with RV51 (L-ch) and RV1 (R-ch) on the TX BASE board so that the reading on the RF voltmeter becomes the specified value. Specified Value : L-ch R-ch RV51 RV1 480 mV ± 2.5 mV 480 mV ± 2.5 mV
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TP15 iGND j
Adjustment Procedure : No signal state. 1. Connect the frequency counter to TP11 (L-ch) and TP13 (Rch) on the TX BASE board. 2. Adjust with L51 (L-ch) and L1 (R-ch) on the TX BASE board so that the reading on the frequency counter becomes the specified value. Specified Value : L-ch R-ch L51 L1 2.3 MHz ± 2kHz 2.8 MHz ± 2kHz
Adjustment Location : � TX BASE BOARD (Conductor side) �
TP15 (GND) TP11 (L-ch) TP13 (R-ch) RV51 RF level adjustment (L-ch) L51 Oscillating frequency adjustment (L-ch) RV1 RF level adjustment (R-ch) L1 Oscillating frequency adjustment (R-ch)
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