Good quality Service Manual, availability of components includes disassembly, electronic adjustments. Includes a full list of details and diagrams. Contains 58 pages.
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Text excerpt from page 42 (click to view)
TROUBLESHOOTING GUIDE
AUDIO CAN NOT BE RECORDED
Is BIAS level O.K at L4005 ? Yes
No
Is the voltage at pin 2 of L4005 5.8V ? Yes
No
Check POWER circuit.
Is the voltage at pin 29 of IC1002 about 5V ? Yes
No
Replace IC1002.
L4005 is broken or shorted. Is there AUDIO signal at pin 5 of CP4002 ? Yes No Check the circuit between pin4 of IC4001 to pin 5 of CP4002.