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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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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
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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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[5] MAIN ASSY
Flowchart of Failure Analysis for The MAIN Assy
Failure analysis for the MAIN Assy => MA1
The STB LED does not light although STB 3.4 V power is supplied.
Does the POWER switch on?
B
No
Turn the POWER switch on.
Yes Is resetting of the IF microcomputer canceled? Yes Is the voltage at Pin 3 of the M11 connector High? Yes Is the M11 connector securely connected? Yes
C
No
Replace the MAIN Assy.
Failure in the RST IC (IC8302) output or its peripheral circuits
No
Replace the MAIN Assy.
Failure in the line between the IF microcomputer and M11 connector
No
Securely connect the M11 connector.
Is the cable that is connected to the M11 connector broken? No No problem with the MAIN Assy. Check the LED Assy.
Yes
Replace the cable (J116).
Failure analysis for the MAIN Assy => MA2
The RELAY port does not work. The power is not turned on.
D
Is the voltage at Pin 50 of the M4 connector 3.4 V? Yes
No
Replace the MAIN Assy.
Relay control is unable unless it supplies a power supply to the module microcompute.
Are the voltages (1.5 V/2.5 V/3.4 V) No supplied to the main microcomputer? Yes Is voltage at REQ_IF on the MAIN Assy High (3.3 V)? Yes
E
Replace the MAIN Assy.
No
Can the unit be turned on, using the remote control unit? Yes
No
Replace the cable (J117) that connects between the IR and MAIN Assys.
NG Replace the IR Assy. NG Replace the MAIN Assy.
Can the unit be turned on, using the Power switch on the unit? Yes
No
Replace the cable (J116) that connects between the SIDE KEY and MAIN Assys.
NG Replace the SIDE KEY Assy. NG Replace the MAIN Assy.
Can the unit be turned on, using RS-232C commands? Replace the MAIN Assy.
No
Replace the 50P cable (J213) that NG Replace the IO Assy. connects between the IO and MAIN Assys. NG Replace the MAIN Assy.
F
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PDP-LX6090H
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