Hitachi DPK 321 U Service Manual
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Extracted text from Hitachi DPK 321 U Service Manual (Ocr-read)
Page 1
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Hitachi. Ltd. Tokyo Japan
HITACHI SOLID STATE
STEREOPHONIC RADIO PHONOGRAPH
MODEL DPK-32l (U)
SUPPLEMENT
SERVICE MAIIIIAI
NO. IQ-l I97|
Model DPK-321(U) is improved by modifying part of the circuit and replacing a few
parts as follows;
1) The old model picked up short wave signals sometimes during AM broadcast
receptioni
To avoid this trouble, in sets from Serial No.35201501 part of RFPCB and the
ferrite antenna are modified.
2) Varister HV-26 and power transistor ZSC83O are replaced with diode VO-6C and
power transistor ZSC1060 respectively (Both interchangeable).
I. SPECIFICATIONS
BEFORE ALTERATION AFTER ALTERATION
Amplifier
Diodes ............................................................ 25 Diodes .................................................................. 24
AM tuner
Sensitivity """"""""""""" l70,uV/m(IHF S/NZOdB) Sensitivity -------------------------- 300}1V/m
2. DIAL CORD SETTING
S-turns