ALLEN
&
HEATH
ZED 14 service manual
AP7176
Issue 4 Page - 5 - of 11
HEADPHONE AMPLIFIER
PROTECTION [RECN1518
Implemented from serial number
Z142120x086111
To protect headphone amp
compnents from damage when
headphone jack is inserted
slopwly. Also improves
headphone performance.
Resistor value changes on headphone/meter PCB 003-659.
Resistor
Old Value
New value
R23
10R
0R
R26 10R 75R
R27 10R 75R
HF INSTABILITY On Mono I/P
Implemented on Issue 5 mono i/p PCB 003-652.
AG6744_5
Resistor value changes on mono i/p PCB 003-652.
Resistor
Old Value
New value
R22
0R
68R
Resistor
Old Value
New value
R23
10R
0R
R26 10R 75R
R27 10R 75R
