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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!!!!
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IC BLOCK DIAGRAM & DESCRIPTION
IC902 LC78622E(Degital Signal Processor)
Terminal No. Terminal symbols
I/O O I O O O O I O O I O I I I O O O I I I Power terminal for crystal oscillator
43 XVDD 44 XOUT 45 XIN 46 XVSS 47 SBSY 48 EFLG 49 PW 50 SFSY 51 SBCK 52 FSX 53 WRQ 54 RWC 55 SQOUT 56 COIN 57 *CQCK 58 *RES 59 TST11 60 16M 61 4.2M 62 TEST5 63 *CS 64 TEST1
Joining terminal for crystal resonator (16.9344 MHz) Ground terminal for crystal oscillator. Make sure to ground. Output terminal for synchronizing signals of sub-code clock. Monitor terminal for 1 bit or 2 bit error correction Output terminal for sub-code P, Q, R, S, T, U or W. Output terminal for synchronizing signals of sub-code frame. When sub-code is stood by, falls. Input terminal for clock to read out sub-code. Schmitt input (when not used, make sure to ground.) Output terminal for synchronizing signal (7.35 kHz) which is divided from crystal oscillator. Output terminal for Q output standby of sub-code. Input terminal for read/write control. Schmitt input. Output terminal for Q output of sub-code. Input terminal for command from micro-computer. Input terminal either for clock to take in command input or for clock to take out sub-code from SQOUT. Schmitt inpu Input terminal for reseting this LSI. Switches to "L" position for a moment at power-on. Output terminal for test. Make sure to open circuit. (Normally "L" output) Output terminal of 16.9344 MHz Output terminal of 4.2336 MHz Input terminal for test. Pull-down resistor incorporated. Make sure to ground.
Input terminal for chip selecting. Pull-down resistor incorporated. Make sure to ground when not controlled.
Input terminal for test. No pull-down resistor. Make sure to ground.
Note: Each power terminal (VDD, VVDD, LVDD, RVDD and XVDD) must be supplyed with the same voltage.
IC901 LA9241M(Servo Signal Processor)
Vcc1 64 LDS 63 LDD 62 BH1 PH1 61 60 LF2 59 VR REF1 Vcc2 FSS DRF CE DAT CL CLK 58 57 56 55 54 53 52 51 50 DEF 49
APC RF DET
47 TBC FIN1 2
46 FSC 45 DGND
MICOM INTER FACE SLC
43 SLC 42 RFS-
RF Amp TE
TE- 6 41 RFSM TE 7 TESI 8 40 CV+
T.SERVO & T.LOGICK
38 SLOF TH 10 37 HFL
36 TES 35 TOFF
F.SERVO & F.LOGICK
FE FE- AGND SP
SPD SLEQ SLD
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