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The manual was of good quality with high resolution schematic diagrams.
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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!
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Quality scan, great manual. I solved my problem with this manual.
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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!!!!
PDR-509
Code
Symptom
Contents of Error
Defects related to the recording laser power
Possible Cause
� Defective laser diode � Trouble in RF detection � Defective RFT RFB circuit � Recording power is not sufficient. � Improper soldering, pattern short � Trouble with power supply � Unable to read ATIP or subcode � Defective laser diode � Defective focus drive circuits � Defective pickup � Improper soldering � Pattern short � Trouble of power supply If any hardware trouble occurs before displaying A� or d�, the unit stops displaying a code other than these codes. Therefore, these service codes are generated only for troubles with the disc.
Checkpoints
IC201 (PA9007A) IC101 (AK8563) IC363 (TC7S04F) IC364 (TC7S14F)
C�
The unit stops before it enters REC/PAUSE mode.
� Dirty or cracked disc � The optimum recording power cannot be obtained. � Trouble in RF detection. Defective pickup � Unable to focus because of dirt or
F�
The unit stops during playback or recording.
crack on the inserted disc. � Unable to output the proper laser power
IC451 (M56788FP) IC401 (CXD2585Q)
A�
The unit stops in a recording-related operation, displaying "CHECK DISC."
� Unable to focus Stop during recording � The unit stops, being obstructed by a dirt or a crack on the disc.
d�
The unit stops in a recording related operation, displaying "CHECK DISC." The unit does not read the inserted disc, and stops.
The indication for * shows themechanism mode listed below. No.
0 1 2 3 4
Mechanism Mode
PLAY OPEN STOP � �
No.
5 6 7 8 9
Mechanism Mode
SETUP TOC READ � SEARCH REC/PAUSE
No.
A B C D E REC
Mechanism Mode
TOC REC OPC TOC CHECK PMA, ACTUAL PAUSE REC
71
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