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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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1. IC10 (TDA7513T) -The Tuner adjustment method
â¢ When IC10 and its circumference are fixed, according to the following order, it readjusts if needed. â¢ The adjustment item changes with parts to exchange. Please refer to "Parts vs Adjustment item table".
1-3. Adjustment of FM_ANT&RF Coil
Voltage Check Point : S-METER-Check Land (PWB Side B, around W572) Adjustment Coil : ANT Coil = L505 RF Coil = L506 Setting of Signal Generator : Refer to the following tables.
TYPE E/M K J MODE FM FM FM freq. 87.5MHz 87.9MHz 76.0MHz Mod. OFF OFF OFF ANT Input 5 or 11dBuEMF 5 or 11dBuEMF 5 or 11dBuEMF Fig (A),(C) (A),(C) (A),(C)
1-1. VCO Coil Adjustment - Adjustment of Tunning Voltage
: Vt-Check Land (PWB Side B, around D506) Adjustment Coil : L507 (VCO Coil) The adjustment method : VCO coil is turned and adjusted according to the following tables.
TYPE E/M K J Mode AM AM FM freq. 1611kHz 1700kHz 90.0MHz Voltage 5.5 Â± 0.1(V) 5.8 Â± 0.1(V) 5.6 Â± 0.1(V) Fig (C) (C) (C)
Voltage Check Point
qThe appearance and the coil with which S-METER DC voltage serves as the maximum are turned and adjusted in the above-mentioned SG input. wBy the above-mentioned adjustment method, same adjustment is performed to both sides (ANT & RF Coil).
M : AM Adjustment For Your Information : The frequency of SET is only set up by Pre-Set-Key in case this adjustment
1-4. Adjustment of STEREO (adjustment of 456k-VCO)
Adjust in TEST MODE â¢ How to enter the test mode While pressing on [FM] and [PRESET 6] keys, reset the unit. â¢ Adjustment method Complete on condition that show âALL OFFâ when pressing on [PRESET 1] and [PRESET 6] keys. (Writing adjustment valve to the EEPROM.) Effect of adjustment is in cofirmation of adjustment status at [PRESET 4] key. â¢ Display of [PRESET 4] Adjustment âOKâ : 14seg model âE2P OKâ 7seg model âEPOâ Adjustment âNGâ : 14seg model âE2P ERRâ 7seg model âEPEâ â¢ Releasing the test mode Reset mode only. ACC off, Power off, Power down and Remove the panel mode is not releasing.
1-2. Adjustment of 1st & 2nd-MIX Coil
Voltage Check Point : S-METER-Check Land (PWB Side B, around W572) Adjustment Coil : 1st IFT = L508 / 2nd IFT = L509 Setting of Signal Generator : Refer to the following tables
TYPE K E,M,J MODE AM AM freq. 1000kHz 999kHz Mod. OFF OFF ANT Input 35dBuEMF 35dBuEMF Fig (B),(C) (B),(C)
q The appearance and the coil with which S-METER DC voltage serves as the maximum are turned and adjusted in the above-mentioned SG input. w By the above-mentioned adjustment method, same adjustment is performed to both sides (1st & 2nd MIX Coil).
L505 L506 L507 L508
(C) DC Voltmeter Vt Check Land IC10
S-METER Check Land (OVER VIEW) (UNDER VIEW)