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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.
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This was the Sony CCU-500A Service manual I was looking for.
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1-1 Setting of initial conditions
While pressing the [ENTER] key, put the plug into an AC power outlet.
2. Destination list of TUNER
Destinat- Tuner ion type BAND K,P M,V,X,Y M M,V,X,Y M K1 K2 K3 E1 E3 E1 E T RDS E2 RDS FM AM FM AM FM MW SW FM AM FM MW SW FM AM FM MW LW Receiving frequency range 87.5MHz~108.0MHz 530kHz~1700kHz 87.5MHz~108.0MHz 530kHz~1610kHz 87.5MHz~108.0MHz 530kHz~1610kHz 5.9MHz~17.9MHz 87.5MHz~108.0MHz 531kHz~1602kHz 87.5MHz~108.0MHz 531kHz~1602kHz 5.9MHz~17.9MHz 87.5MHz~108.0MHz 531kHz~1602kHz 87.5MHz~108.0MHz 531kHz~1602kHz 153kHz~279kHz Channel space IF RF 25kHz 100kHz +10.7MHz
1-2 Initializing operation
â¢ A microcomputer is initialized for start when the AC power is turned on when pressing the [ENTER] key. At that time, CD mechanism and CASSETTE mechanism are also initialized. â¢ During the initial operation,the display shows INITIALIZE and after that it will be returned to STANDBY condition.
10kHz +450kHz 10kHz 100kHz +10.7MHz 25kH 10kHz +450kHz 10kHz 100kHz +10.7MHz 10kHz +450kHz 5kHz +450kHz 50kHz +10.7MHz 9kHz +450kHz 50kHz +10.7MHz 9kHz +450kHz 5kHz +450kHz 50kHz +10.7MHz 9kHz +450kHz 50kHz +10.7MHz 9kHz 9kHz +450kHz +450kHz 25kHz 10kHz 5kHz 25kHz 9kHz 25kHz 9kHz 5kHz 25kHz 9kHz 25kHz 9kHz 9kHz 5kHz 5kHz 9kHz 9kHz
1-3 Initial items and back up data
ITEMS *POWER *VOLUME *BALANCE MUTING PROTECTION AMP S. DIRECT DISPLAY MODE *AUTO POWER SAVE *MD/DVD INPUT LEVEL *INPUT SEL. *BAND TUNER *FREQUENCY *AUTO/MONO *P.CH *CLOCK CLOCK *PROG. RECORDING *PROG. TIMER PLAY SLEEP TIMER O.T.T. *DIRECTION *RVS MODE *A/B STANDBY 14 CENTER OFF OFF OFF AUTO OFF -3 TUNER FM LOWEST FREQUENCY AUTO --CH 0:00 (E/T/Q) 12:00 (OTHERS) ON/OFF TIME 0:00 (E/T/Q) 12:00 (OTHERS) ON/OFF TIME 0:00 (E/T/Q) 12:00 (OTHERS) OFF OFF FORWARD REVERSE B
FML 65.0MHz~74.0MHz FMH 87.5MHz~108.0MHz MW 531kHz~1602kHz LW 153kHz~279kHz
10kHz +10.7MHz 50kHz +10.7MHz 9kHz +450kHz 9kHz +450kHz
2-1 Discrimination of TUNER destination
Destination K M1 M2 T E Q R107 [Â½] 91k 39k 22k 13k 8.2k 4.7k Voltage [V] 4.51 3.98 3.44 2.83 2.25 1.60
AVdd 10 kÂ½ X13 IC1 91pin (TYPE)
3. Test mode
3-1 Test mode of the receiver
3-1-1 Setting of the test mode While pressing the [INPUT] key or [BAND] key, put the plug into an AC power outlet. 3-1-2 Canceling of the test mode Unplug an AC power cord from an AC power outlet. 3-1-3 Condition in test mode â¢ Power â¢ â¢ â¢ â¢ ON â¢ EX.BASS â¢ â¢ â¢ OFF â¢ S.W â¢ â¢ â¢ â¢ â¢ â¢ â¢ OFF â¢ Selector mode or FL indication
KEY SELECTOR MODE FL INDICATION â¢ All the fluorescent display indicators and LEDs light on. [BAND] + AC ON TUNER â¢ STANDBY and TIMER LEDs blink up. â¢ The all illminated state is cleared by pressing any main unit keys or remocon keys. â¢ AUX TEST
*BACKED UP DATA
1-4 Mechanism initialization
1-4-1 CD mechanism â¢ Disc unclamps(traverse down). â¢ Rotary tray rotates(1/3 rotation). â¢ If a mechanism error occurs, CD ERR is indicated on the display. 1-4-2 DECK mechanism â¢ When initial condition becomes NG for the third time, decide the error. The error condition is displayed as X ERR on the display. 1-4-3 Error display â¢ If both mechanism (CD/DECK) error occur, the display is indicated as follows. CD & X ERR
[INPUT] + AC ON